JP2018168339A - Resin composition, film and method for producing resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition capable of forming a layer having excellent adhesiveness to an optically functional layer, a film having a primer layer which is a crosslinked product of the resin composition, and a method for producing the resin composition. A resin composition comprises a (meth) acrylic resin containing 0.1% by mass to 50.0% by mass of a structural unit derived from a monomer having a crosslinkable functional group with respect to all the structural units. Contains a resin other than the (meth) acrylic resin selected from the water-soluble resin and the water-dispersible resin, and a cross-linking agent of 0.3 parts by mass to 50.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin. , (Meta) acrylic resin comprises an aqueous medium, a resin other than the acrylic resin selected from the water-soluble resin and the water-dispersible resin, a monomer constituting the (meth) acrylic resin, and a (meth) acrylic resin. The monomer constituting the (meth) acrylic resin is polymerized in a precursor mixture containing 0.05 parts by mass to 5.0 parts by mass of a chain transfer agent with respect to 100 parts by mass of the total of the monomers to be used. And get it. [Selection diagram] None

Description

  The present invention relates to a resin composition, a film, and a method for producing the resin composition.

Polyethylene terephthalate (hereinafter also referred to as “PET”) films and polyester films are excellent in transparency and dimensional stability, and are therefore used as a base material for functional films in which layers having various functions (functional layers) are laminated. It has been. As the functional layer, for example, a prism layer, a light diffusion layer, and a hard coat layer are known.
Since the resin component constituting the functional layer and the base material are different from each other, it is known that peeling is likely to occur when the functional layer is directly formed on the base material. For this reason, the functional film is often provided with a layer (hereinafter also referred to as “primer layer”) having excellent adhesion to the functional layer and the base material.

As a method for producing a functional film, for example, the following method is known. First, a primer layer is formed on a PET film or the like serving as a base material to produce a film with a primer layer (hereinafter also referred to as “easily adhesive film”). Thereafter, a functional layer is formed on the primer layer of the easily adhesive film.
As the material for forming the primer layer, so-called primer agent, for example, an acrylic copolymer aqueous dispersion obtained by polymerizing a specific monomer in the presence of a specific polymer compound is disclosed (for example, , See Patent Document 1).

JP 2010-53227 A

In recent years, there has been an increase in optical functional films in which functional layers (optical functional layers) having optical functions such as a rhythm layer and a light diffusion layer are laminated.
For example, a prism layer of an optical functional film is formed by applying a resin solution for forming a prism layer on an easy-adhesion film and irradiating it with ultraviolet rays while forming unevenness by pressing with a mold from the coated surface side. Is formed by curing. Since a mechanical force is applied to the primer layer at the time of pressing with a mold, peeling from the mold, etc., there is a tendency that peeling between the prism layer and the primer layer tends to occur.

In addition, optical functional layers such as a prism layer tend to be used with a thicker layer in order to ensure an optical function. In addition, since the resin solution used for forming the optical functional layer has a relatively high viscosity, the resin solution is not sufficiently wetted and spread on the primer layer, and peeling between the optical functional layer and the primer layer is likely to occur. There was a trend.
In the primer layer formed from the conventional primer agent described in Patent Document 1 that does not contain a chain transfer agent, there are cases where the adhesiveness to an optical functional layer such as a prism layer is not sufficient.

  The present invention has been made in view of the above, and a resin composition capable of forming a primer layer excellent in adhesion to an optical functional layer, a film having a primer layer that is a cross-linked product of the resin composition, and the resin It is an object to provide a method for producing a composition.

Specific means for solving the above problems include the following modes.
<1> A (meth) acrylic resin having 0.1 to 50.0% by mass of a structural unit derived from a monomer having a crosslinkable functional group based on all structural units, a water-soluble resin, and water dispersibility A resin other than the (meth) acrylic resin selected from resins, and a crosslinking agent that is 0.3 to 50.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin, The (meth) acrylic resin is an aqueous medium, a resin other than the acrylic resin selected from the water-soluble resin and the water-dispersible resin, a monomer constituting the (meth) acrylic resin, and the (meth) acrylic A single component constituting the (meth) acrylic resin in a precursor mixture containing 0.05 to 5.0 parts by mass of a chain transfer agent with respect to a total of 100 parts by mass of monomers constituting the resin. Resin composition obtained by polymerizing monomer .

<2> The precursor mixture further includes a polymerization initiator,
Resin according to <1>, wherein the content of the polymerization initiator is 0.1 part by mass to 5.0 parts by mass with respect to 100 parts by mass in total of the monomers constituting the (meth) acrylic resin. Composition.

<3> The resin composition according to <2>, wherein the polymerization initiator is at least one peroxide having a sulfonyl group.

<4> The resin composition according to any one of <1> to <3>, wherein the (meth) acrylic resin has a weight average molecular weight of 100,000 to 1,900,000.

<5> The precursor mixture includes a reactive emulsifier, and the content of the reactive emulsifier is 3.0 parts by mass to 30 parts by mass with respect to a total of 100 parts by mass of monomers constituting the (meth) acrylic resin. The resin composition according to any one of <1> to <4>, which is 0.0 part by mass.

<6> The resin other than the acrylic resin selected from the water-soluble resin and the water-dispersible resin is at least one selected from a polyester resin and a polyurethane resin, and any one of <1> to <5> The resin composition as described.

<7> The resin composition according to any one of <1> to <6>, including a melamine-based crosslinking agent as the crosslinking agent.

<8> Further containing sulfate ions, the content of the sulfate ions is 0.1 part by mass to 1.5 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin. <1> to <7> The resin composition as described in any one of these.

The film which has a <9> base material and the primer layer which is a crosslinked material of the resin composition as described in any one of <1>-<8>.

<10> An aqueous medium, a resin other than a (meth) acrylic resin selected from a water-soluble resin and a water-dispersible resin, a monomer constituting the (meth) acrylic resin, and the (meth) acrylic resin A monomer constituting the (meth) acrylic resin in a precursor mixture containing 0.05 to 5.0 parts by mass of a chain transfer agent with respect to a total of 100 parts by mass of the monomers A step of obtaining a dispersion of the (meth) acrylic resin by polymerization, a dispersion of the (meth) acrylic resin, and 0.3 parts by mass to 50.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin. And a step of mixing a crosslinking agent that is a part, wherein the (meth) acrylic resin contains 0.1% by mass of a structural unit derived from a monomer having a crosslinkable functional group based on the total structural unit Production method of resin composition containing ˜50.0% by mass .

  ADVANTAGE OF THE INVENTION According to this invention, the resin composition which can form the primer layer excellent in the adhesiveness with respect to an optical functional layer, the film which has a primer layer which is a crosslinked material of this resin composition, and the manufacturing method of this resin composition are provided. The

Hereinafter, the resin composition of the present invention will be described in detail. In the present invention, “to” in a numerical range means including numerical values before and after “to”.
In this specification, the amount of each component in the composition is the total amount of the plurality of substances present in the composition unless there is a specific indication when there are a plurality of substances corresponding to each component in the composition. Means.

In this specification, the (meth) acrylic resin means a polymer formed by polymerizing at least a monomer having a (meth) acryloyl group as a main component. The main component in the (meth) acrylic resin means that the content (mass%) is the largest among the monomer components forming the polymer. For example, in the case of a (meth) acrylic resin, it means that the content of a structural unit derived from a monomer having a (meth) acryloyl group as a main component is 50% by mass or more of all structural units.
In this specification, “(meth) acryl” means to include both “acryl” and “methacryl”, and “(meth) acrylate” includes both “acrylate” and “methacrylate”. And “(meth) acryloyl” is meant to encompass both “acryloyl” and “methacryloyl”.
In the present specification, “adhesiveness” means a property that the primer layer is not easily peeled off from the optical functional layer and the substrate after the primer layer, the optical functional layer and the substrate are once attached. .

≪Resin composition≫
The resin composition of the present invention comprises a (meth) acrylic resin containing 0.1% by mass to 50.0% by mass of a structural unit derived from a monomer having a crosslinkable functional group, based on the total structural unit, water-soluble A resin other than the (meth) acrylic resin, and a crosslinking agent that is 0.3 to 50.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin, selected from a water-soluble resin and a water-dispersible resin The (meth) acrylic resin comprises an aqueous medium, a resin other than the (meth) acrylic resin selected from the water-soluble resin and the water-dispersible resin, and a single resin constituting the (meth) acrylic resin. In a precursor mixture comprising a monomer and a chain transfer agent that is 0.05 to 5.0 parts by mass with respect to a total of 100 parts by mass of monomers constituting the (meth) acrylic resin. (Meth) acrylic resin Obtained by.
The resin composition of this invention may contain other components other than the component demonstrated above further as needed.

  The resin composition of the present invention can form a primer layer having excellent adhesion to the optical functional layer. The reason for this is not clear, but is presumed as follows.

  As a result of investigation by the inventors, a resin composition (hereinafter referred to as “blend resin composition”) prepared by separately producing a (meth) acrylic resin and a resin other than the (meth) acrylic resin and then mixing these two resins. The resin other than the (meth) acrylic resin is not compatible with the (meth) acrylic resin and is partially unevenly distributed. Therefore, the aqueous dispersion of the blend resin composition is There was a tendency to cause phase separation. When the primer layer is formed using such a blend resin composition, the adhesion to the optical functional layer may not be sufficiently exhibited. This is considered to be because the compatibility between the (meth) acrylic resin and the resin other than the (meth) acrylic resin is poor.

The (meth) acrylic resin contained in the resin composition of the present invention comprises at least an aqueous medium, a resin other than the (meth) acrylic resin selected from a water-soluble resin and a water-dispersible resin, and a (meth) acrylic resin. It is obtained by polymerizing the monomer constituting the (meth) acrylic resin in a precursor mixture containing the constituting monomer and a specific amount of chain transfer agent. That is, the (meth) acrylic resin is subjected to seed polymerization using a resin other than the (meth) acrylic resin selected from a water-soluble resin and a water-dispersible resin as a seed resin (hereinafter also referred to as “seed resin”). It is obtained by.
In seed polymerization, for example, a monomer and a chain transfer that constitute a (meth) acrylic resin in a solution in which a resin other than a (meth) acrylic resin selected from a water-soluble resin and a water-dispersible resin is dispersed or dissolved in an aqueous medium. This is a polymerization reaction in which an agent is added and a resin other than a (meth) acrylic resin selected from water-soluble resins and water-dispersible resins as a nucleus. The resin particles obtained by seed polymerization have a structure in which (meth) acrylic resin and resin other than (meth) acrylic resin selected from water-soluble resin and water-dispersible resin are entangled with each other inside the resin particle. Inferred.
At least a resin composition containing a (meth) acrylic resin obtained by seed polymerization and a resin other than a (meth) acrylic resin selected from a water-soluble resin and a water-dispersible resin, as compared with a blended resin composition Since phase separation hardly occurs, the primer layer formed from the resin composition of the present invention tends to be excellent in adhesion to the optical functional layer.

The (meth) acrylic resin contained in the resin composition of the present invention is obtained by seed polymerization using a specific amount of chain transfer agent. In general, when a (meth) acrylic resin and a resin other than an acrylic resin are seed-polymerized without using a chain transfer agent, the resulting (meth) acrylic resin has a weight average molecular weight (Mw) of 2 million to 3 million. Tend to be. On the other hand, when seed polymerization is performed using a chain transfer agent, the weight average molecular weight (Mw) of the obtained (meth) acrylic resin tends to be about 100,000 to 1.9 million, and the molecular weight tends to be kept low. is there.
Therefore, the primer layer formed from the resin composition of the present invention is softer and optical compared to the primer layer formed from the resin composition containing the (meth) acrylic resin obtained without using the chain transfer agent. The familiarity with the functional layer and the substrate can be improved. Therefore, even if the optical functional layer and the primer layer have different shrinkage rates, the followability of the primer layer to the optical functional layer is good, so it is assumed that the adhesive property to the optical functional layer is excellent. Is done.

  The (meth) acrylic resin has a structural unit derived from a monomer having a specific amount of a crosslinkable functional group, and the resin composition of the present invention contains a specific amount of a crosslinking agent. The primer layer formed from the resin composition has an appropriate hardness. Since the primer layer has an appropriate hardness, the force is easily dispersed even when a force is applied to the primer layer, and it is possible to make it difficult to peel off from the base material and the optical functional layer. Become.

Thus, since the resin composition of this invention can form the primer layer which has both softness and hardness, it is guessed that it is excellent in the adhesiveness with respect to an optical functional layer.
Hereinafter, the detail of each component used for the resin composition of this invention is demonstrated.

<(Meth) acrylic resin>
The resin composition of the present invention contains a (meth) acrylic resin (hereinafter also referred to as “specific (meth) acrylic resin”) having a structural unit derived from a monomer having a crosslinkable functional group.
The specific (meth) acrylic resin used in the resin composition of the present invention is at least a resin other than a (meth) acrylic resin selected from an aqueous medium described later, a water-soluble resin and a water-dispersible resin (hereinafter referred to as “(meta) ) A specific resin other than an acrylic resin "), a monomer constituting the specific (meth) acrylic resin, and a specific amount of a chain transfer agent, the (meth) acrylic resin in the precursor mixture. It is obtained by polymerizing the constituent monomers. That is, it is obtained by seed polymerization of a specific resin other than the (meth) acrylic resin and a monomer constituting the specific (meth) acrylic resin as the seed resin.

  Since the specific (meth) acrylic resin used in the resin composition of the present invention has a crosslinkable functional group, it can undergo a crosslinking reaction with a crosslinking agent described later. For this reason, the primer layer formed from the resin composition of the present invention has a cross-linked structure, is imparted with appropriate hardness, and tends to improve adhesion to the optical functional layer and the substrate.

The monomer having a crosslinkable functional group is not particularly limited as long as it can form a crosslinked structure with a crosslinking agent described later. Examples of the monomer having a crosslinkable functional group include monomers having a carboxy group, a methylol group, a hydroxyl group, a glycidyl group, an amide group, a tertiary amino group, and the like.
Among these, from the viewpoint of reactivity with the crosslinking agent, the crosslinkable functional group is preferably at least one selected from the group consisting of a carboxy group, a methylol group, a hydroxyl group, and a glycidyl group, More preferably, it is at least one selected from the group consisting of a methylol group and a hydroxyl group, and more preferably at least one of a carboxy group and a methylol group.
As the monomer having a crosslinkable functional group, one type may be used alone, or two or more types may be used in combination.

  Further, from the viewpoint of improving the adhesiveness while achieving both softness and hardness, the (meth) acrylic resin preferably contains two or more structural units derived from a monomer having a crosslinkable functional group. It is more preferable to contain a structural unit derived from a monomer having at least one of a group and a hydroxyl group and a structural unit derived from a monomer having a methylol group, and a structure derived from a monomer having a carboxy group More preferably, it contains a unit and a structural unit derived from a monomer having a methylol group.

The monomer having a carboxy group is not particularly limited. For example, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid, itaconic acid, citraconic acid, cinnamic acid, 2- (meth) Acrylyloxyethyl succinic acid, monohydroxyethyl (meth) acrylate maleate, monohydroxyethyl (meth) acrylate fumarate, monohydroxyethyl (meth) acrylate phthalate, 1,2-dicarboxycyclohexane monohydroxyethyl (meth) acrylate , (Meth) acrylic acid dimer and ω-carboxy-polycaprolactone mono (meth) acrylate.
The monomer which has a carboxy group may be used individually by 1 type, and may use 2 or more types together.

  From the viewpoint of reactivity with the crosslinking agent described later, the monomer having a carboxy group is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid and ω-carboxy-polycaprolactone mono (meth) acrylate. It is preferable to include at least one, more preferably at least one selected from the group consisting of acrylic acid, methacrylic acid, and ω-carboxy-polycaprolactone mono (meth) acrylate, and even more preferably methacrylic acid.

The monomer having a methylol group is not particularly limited, and examples thereof include N-methylol acrylamide, N-methylol methacrylamide, dimethylol acrylamide, dimethylol methacrylamide, N-butyrol acrylamide and N-butyrol methacrylamide. Can be mentioned.
Among these, it is preferable that N-methylol acrylamide is included as a monomer which has a methylol group from a viewpoint of the self-crosslinking reactivity mentioned later.

  Examples of the monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 6-hydroxy. Examples include hexyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, and 3-methyl-3-hydroxybutyl (meth) acrylate.

  Examples of the monomer having a glycidyl group include glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, glycidyl vinyl ether, 3,4-epoxycyclohexyl vinyl ether, glycidyl (meth) allyl ether, 3, 4-epoxycyclohexyl (meth) allyl ether is mentioned.

  Examples of the monomer having an amide group include acrylamide, methacrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-methoxymethyl (meth) acrylamide, and N-ethoxymethyl (meth) acrylamide. N-propoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N-tert-butylacrylamide, N-octylacrylamide, and diacetone acrylamide.

  Examples of the monomer having a tertiary amino group include dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, and dimethylaminopropyl (meth) acrylamide.

The content rate of the structural unit derived from the monomer which has a crosslinkable functional group is 0.1 mass%-50.0 mass% with respect to all the structural units of a specific (meth) acrylic resin.
If the content of the structural unit derived from the monomer having a crosslinkable functional group is less than 0.1% by mass, the primer layer cannot sufficiently react with the crosslinking agent described later, and the primer layer has sufficient hardness. Tends to be difficult to impart. Moreover, when the content rate of the structural unit derived from the monomer which has a crosslinkable functional group exceeds 50.0 mass%, reaction with the crosslinking agent mentioned later will advance too much and the formed primer layer is hard. It may become too much and the adhesiveness with respect to an optical functional layer and a base material layer may not fully be exhibited.
From the above viewpoint, the content of the structural unit derived from the monomer having a crosslinkable functional group is preferably 0.2% by mass to 50.0% by mass, and 0.4% by mass to 45.0% by mass. More preferably, 1.0 mass%-45.0 mass% are still more preferable, and 1.5 mass%-40.0 mass% are especially preferable.
When the precursor mixture used for the resin composition of the present invention contains a reactive emulsifier described later, the specific (meth) acrylic resin has a structure derived from the reactive emulsifier described later structurally. In this specification, the content rate of the structural unit derived from the monomer which has a crosslinkable functional group means the content rate with respect to all the structural units except the structural unit derived from the reactive emulsifier mentioned later.
The same applies to the case where the content of structural units derived from the monomers described below is determined.

When the specific (meth) acrylic resin used in the resin composition of the present invention includes a monomer having a carboxy group as a structural unit derived from a monomer having a crosslinkable functional group, the monomer having a carboxy group As for the content rate of the structural unit derived from a body, 0.2 mass%-40.0 mass% are preferable with respect to all the structural units of a (meth) acrylic resin.
When the content of the structural unit derived from the monomer having a carboxy group is 0.2% by mass or more, the monomer having a carboxy group tends to localize in the vicinity of the surface layer of the resin particle. It reacts with the crosslinking agent to form a crosslinked structure between the resin particles, and tends to impart an appropriate hardness to the primer layer. When the content of the structural unit derived from the monomer having a carboxy group is 40.0% by mass or less, formation of a cross-linked structure between the resin particles is moderately suppressed, the primer layer does not become too hard, and optical There exists a tendency for the adhesiveness with respect to a functional layer and a base material to improve.
From the above viewpoint, the content of the structural unit derived from the monomer having a carboxy group is more preferably 0.2% by mass to 20.0% by mass, and further preferably 0.5% by mass to 10.0% by mass. 1.0 mass% to 8.0 mass% is particularly preferable.

When the (meth) acrylic resin used in the resin composition of the present invention has a monomer having a methylol group as a structural unit derived from a monomer having a crosslinkable functional group, the monomer having a methylol group As for the content rate of the structural unit derived from, 0.2 mass%-3.0 mass% are preferable with respect to all the structural units of a (meth) acrylic resin.
When the content of the structural unit derived from the monomer having a methylol group is 0.2% by mass or more, moderate hardness can be imparted to the primer layer by the self-crosslinking property of the methylol group inside the resin particle. Tend. Further, when the content of the structural unit derived from the monomer having a methylol group is 3.0% by mass or less, the formation of a crosslinked structure is moderately suppressed, the primer layer does not become too hard, and the optical function There exists a tendency for the adhesiveness with respect to an adhesive layer and a base material to improve.
From the above viewpoint, the content of the structural unit derived from the monomer having a methylol group is more preferably 0.3% by mass to 3.0% by mass with respect to all the structural units of the (meth) acrylic resin, 0.3 mass%-1.0 mass% is still more preferable.
The methylol group may be self-crosslinked to form a crosslinked structure, or may react with a crosslinking agent to form a crosslinked structure.

  The (meth) acrylic resin used in the resin composition of the present invention may further contain a structural unit derived from an alkyl (meth) acrylate in addition to the structural unit derived from the monomer having a crosslinkable functional group. Good.

  When the (meth) acrylic resin used in the resin composition of the present invention contains a structural unit derived from an alkyl (meth) acrylate, the alkyl (meth) acrylate is preferably an unsubstituted alkyl (meth) acrylate, The type is not particularly limited. The alkyl group of the alkyl (meth) acrylate may be linear or branched. The range of 1-18 is preferable and, as for carbon number of the alkyl group of alkyl (meth) acrylate, the range of 1-12 is more preferable. When the carbon number of the alkyl group is within the above range, the adhesiveness to both the optical functional layer and the substrate tends to be excellent regardless of the material of the applied optical functional layer.

Examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, and t-butyl (meth). Acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, n-dodecyl ( Mention may be made of (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate and isobornyl (meth) acrylate.
Alkyl (meth) acrylate may be used individually by 1 type, and may use 2 or more types together.

  From the viewpoint of adhesiveness, the alkyl (meth) acrylate preferably contains at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, and n-butyl (meth) acrylate.

  From the viewpoint of improving the adhesion to both the optical functional layer and the substrate, the content of the structural unit derived from the alkyl (meth) acrylate is 70. With respect to all the structural units of the (meth) acrylic resin. 0 mass%-99.99 mass% are preferable, 85.0 mass%-99.9 mass% are more preferable, 80.0 mass%-99.0 mass% are still more preferable.

  The (meth) acrylic resin used in the present invention is a structural unit derived from a monomer having a crosslinkable functional group and a structural unit derived from an alkyl (meth) acrylate within the range in which the effects of the present invention are exhibited. A structural unit derived from the other monomer (hereinafter, also referred to as “other structural unit”) may be included. The monomer constituting the other structural unit is not particularly limited as long as it can be copolymerized with a monomer having a crosslinkable functional group, and can be appropriately selected according to the purpose.

  As a monomer which comprises other structural units, a polyfunctional acrylic monomer and an aromatic monovinyl monomer are mentioned, for example.

  Examples of the polyfunctional acrylic monomer include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di (meth). ) Acrylate, caprolactone-modified dicyclopentenyl di (meth) acrylate, ethylene oxide-modified di (meth) acrylate, di (meth) acryloxyethyl isocyanurate, tricyclodecane dimethanol (meth) acrylate, dimethylol dicyclopentane di (meth) ) Acrylate, ethylene oxide modified hexahydrophthalic acid di (meth) acrylate, tricyclodecane dimethanol (meth) acrylate, neopentyl glycol modified trimethylpropane di (meth) acrylate, trime Trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, diglycerol tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate.

  Examples of the aromatic monovinyl monomer include styrene, α-methylstyrene, t-butylstyrene, p-chlorostyrene, chloromethylstyrene, and vinyltoluene.

The weight average molecular weight (Mw) of the specific (meth) acrylic resin used in the resin composition of the present invention is preferably 100,000 to 1.9 million. When the weight average molecular weight (Mw) of the specific (meth) acrylic resin is in the above range, the primer layer formed from the resin composition of the present invention is soft and tends to improve conformability to the optical functional layer and the substrate. It is possible to reduce stress.
From the above viewpoint, the weight average molecular weight (Mw) of the specific (meth) acrylic resin is more preferably 300,000 to 1,800,000, still more preferably 900,000 to 1,500,000, particularly preferably 900,000 to 1,300,000, and 900,000 to One million is most preferred.

The weight average molecular weight (Mw) of the specific (meth) acrylic resin is a value measured by the following method.
(Measurement method of weight average molecular weight (Mw))
It measures according to following (1)-(3).
(1) A solution of (meth) acrylic resin is applied to release paper, and dried at room temperature for one day to obtain a film-like (meth) acrylic resin.
(2) The film-like (meth) acrylic resin obtained in (1) above is dissolved in dimethylformamide containing 1 mM lithium bromide so that the solid content is 0.5 mass%. Thereafter, a membrane filter (HPLC Millex-LH, pore size 0.45 μm,
The lysate is filtered at a diameter of 25 mm.
(3) The weight average molecular weight (Mw) of the (meth) acrylic resin is measured as a standard polystyrene conversion value using gel permeation chromatography (GPC) under the following conditions.
(conditions)
GPC: GL7420 GPC (manufactured by GL Sciences Inc.)
Column: SHODEX SB-806M HQ (manufactured by Showa Denko KK) used Mobile phase solvent: 1 mM lithium bromide-containing dimethylformamide Flow rate: 0.5 ml / min
Column temperature: 40 ° C

  The glass transition temperature (Tg) of the specific (meth) acrylic resin used in the resin composition of the present invention is preferably −10 ° C. to 120 ° C. When the Tg of the specific (meth) acrylic resin is 120 ° C. or less, the resin particles dispersed in the aqueous medium do not become too large, and a uniform coating film is easily obtained when the primer layer is formed, and the adhesiveness is excellent. Tend. Moreover, when Tg of specific (meth) acrylic resin is -10 degreeC or more, there exists a tendency which is excellent in the adhesiveness with a base material in the case of the heat processing in a film extending process. From the same viewpoint, Tg of the specific (meth) acrylic resin is more preferably 10 ° C to 120 ° C, and further preferably 20 ° C to 80 ° C.

The glass transition temperature (Tg) of the specific (meth) acrylic resin is a molar average glass transition temperature obtained by calculation of the following formula.
1 / Tg = m ₁ / Tg ₁ + m ₂ / Tg ₂ +... + M _(k−1) / Tg _(k−1) + m _k / Tg _k
... (Formula 1)
In Formula 1, Tg ₁ , Tg ₂ ,..., Tg _(k-1) and Tg _k are absolute temperatures (K) when each monomer constituting the (meth) acrylic resin is a homopolymer. It is a glass transition temperature represented by. m ₁ , m ₂ ,..., m _(k−1) , m _k represent the mole fraction of each monomer constituting the (meth) acrylic resin, and m ₁ + m ₂ +. _(k−1) + m _k = 1.

  The “glass transition temperature represented by the absolute temperature (K) when used as a homopolymer” is represented by the absolute temperature (K) of a homopolymer produced by polymerizing the monomer alone. Refers to the glass transition temperature. The glass transition temperature of the homopolymer was measured using a differential scanning calorimeter (DSC) (EXSTAR 6000, manufactured by Seiko Instruments Inc.) in a nitrogen stream, 10 mg of the measurement sample, and a heating rate of 10 ° C./min. The inflection point of the obtained DSC curve is defined as the glass transition temperature of the homopolymer.

Typical monomer “glass transition temperature expressed by the Celsius temperature (° C.) of homopolymer” is 5 ° C. for methyl acrylate, 103 ° C. for methyl methacrylate, and −27 ° C. for ethyl acrylate. Yes, n-butyl acrylate is -57 ° C, 2-ethylhexyl acrylate is -76 ° C, 2-hydroxyethyl acrylate is -15 ° C, 4-hydroxybutyl acrylate is -39 ° C, t- Butyl acrylate is 41 ° C., acrylic acid is 163 ° C., methacrylic acid is 185 ° C., ω-carboxy-polycaprolactone (n≈2) mono (meth) acrylate is −30 ° C., N-methylol Acrylamide is 110 ° C., benzyl acrylate is 6 ° C., benzyl methacrylate is 54 ° C. There, phenoxyethyl acrylate is -22 ° C., phenoxyethyl methacrylate is 54 ° C.. For example, the glass transition temperature (Tg) of a specific (meth) acrylic resin can be appropriately adjusted by using monomers having different glass transition temperatures of homopolymers.
The absolute temperature (K) can be converted into the Celsius temperature (° C.) by subtracting 273 from the absolute temperature (K), and the Celsius temperature (° C.) can be converted into the absolute temperature (° C.) by adding 273 to the Celsius temperature (° C.). K) can be converted.

From the viewpoint of adhesion to both the optical functional layer and the substrate, the content of the specific (meth) acrylic resin used in the resin composition is 20.0 based on the total mass of the solid content of the resin composition. % By mass to 95.0% by mass is preferable, and 25.0% by mass to 90.0% by mass is more preferable.
The “solid content” is the amount of residue obtained by removing the aqueous medium from the resin composition.

<Specific resin other than (meth) acrylic resin>
The resin composition of this invention contains resin (specific resin other than (meth) acrylic resin) other than (meth) acrylic resin chosen from water-soluble resin and water-dispersible resin. Further, in the resin composition of the present invention, the monomer constituting the specific (meth) acrylic resin is polymerized (seed polymerization) using a specific resin other than the (meth) acrylic resin as a seed resin. A (meth) acrylic resin is obtained.
The specific (meth) acrylic resin obtained by seed polymerization is presumed to have a structure in which the inside of the resin is entangled with a specific (meth) acrylic resin and a specific resin other than the (meth) acrylic resin. Therefore, the compatibility between the specific (meth) acrylic resin and the specific resin other than the (meth) acrylic resin is further improved, and the resin composition of the present invention hardly causes phase separation. The primer layer formed from the resin composition of the present invention tends to be excellent in adhesion to both the optical functional layer and the substrate.

  In the present specification, the water-soluble resin means a resin that dissolves 1% by mass or more in water at 23 ° C. In this specification, a water-dispersible resin is a resin having a hydrophobic part (hydrophobic part) and a hydrophilic part (hydrophilic part) in the molecule, and the resin is dispersed in an aqueous medium. In this case, it means a resin that shows a state in which resin particles are formed in an aqueous medium and the resin particles are dispersed in the aqueous medium.

There is no restriction | limiting in particular as specific resin other than the (meth) acrylic resin used for the resin composition of this invention, A polyurethane resin, a polyester resin, a polyvinyl alcohol resin, etc. are mentioned. The specific resin other than the (meth) acrylic resin may be used alone or in combination of two or more.
Among these, from the viewpoint of good dispersibility or solubility in an aqueous medium, the specific resin other than the (meth) acrylic resin is preferably at least one selected from a polyester resin and a polyurethane resin, and is a polyester resin. It is more preferable.
As a specific resin other than the (meth) acrylic resin, when at least one selected from a polyester resin and a polyurethane resin is used for seed polymerization with a monomer constituting the (meth) acrylic resin, a polyester resin that becomes a seed and Since at least one selected from a polyurethane resin is used as a nucleus, the monomer is polymerized to form a (meth) acrylic resin. Therefore, at least one selected from a polyester resin and a polyurethane resin as a seed and a (meth) acrylic resin It becomes possible to have a structure intertwined with each other, and the adhesiveness tends to be improved with respect to both the optical functional layer and the substrate.

  As a polyester resin, the compound obtained by reaction of polyhydric carboxylic acid and polyhydric alcohol is mentioned, for example.

Examples of the polyvalent carboxylic acid include aliphatic dicarboxylic acids (oxalic acid, malonic acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, succinic acid, alkenyl succinic acid, adipic acid, sebacic acid, etc.) Alicyclic dicarboxylic acids (such as cyclohexanedicarboxylic acid), aromatic dicarboxylic acids (such as terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acid) and their anhydrides, or lower (for example, having 1 to 5 carbon atoms) Examples include alkyl esters. Among these, as the polyvalent carboxylic acid, an aliphatic dicarboxylic acid is preferable from the viewpoint of dispersibility or solubility in an aqueous medium.
A polyvalent carboxylic acid may be used individually by 1 type, and may use 2 or more types together.

Polyhydric alcohols include aliphatic diols (ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butanediol, hexanediol, neopentyl glycol, etc.), alicyclic diols (cyclohexanediol, cyclohexanedimethanol, hydrogenated bisphenol A) Divalent alcohols such as aromatic diols (ethylene oxide adducts of bisphenol A, propylene oxide adducts of bisphenol A, etc.), trihydric or higher alcohols such as glycerin, trimethylolpropane, pentaerythritol, etc. . Among these, as the polyhydric alcohol, an aliphatic diol is preferable from the viewpoint of dispersibility or solubility in an aqueous medium.
A polyhydric alcohol may be used individually by 1 type, and may use 2 or more types together.

  A polyester resin synthesized by a known synthesis method or a commercially available product may be used. Examples of commercially available products include “Plus Coat Z-687”, “Z-690”, “Z-221”, “Z-446”, “Z-561”, “Z-450” manufactured by Kyoyo Chemical Industry Co., Ltd. ”,“ Z-565 ”,“ Z-850 ”,“ Z-3308 ”,“ RZ-105 ”,“ RZ-570 ”,“ Z-730 ”,“ RZ-142 ”, manufactured by Takamatsu Yushi Co., Ltd. Products sold under the product names such as “Pesresin A-110”, “A-124GP”, “A-520”, “A-640”, “A-680”, “Hydran HW350” manufactured by DIC Corporation Is mentioned. Among these, from the viewpoint of dispersibility or solubility in an aqueous medium, it is preferable to use at least one of “A-640” and “A-680” manufactured by Takamatsu Yushi Co., Ltd. as a commercially available product of polyester resin. , “A-640” is preferably used.

  The weight average molecular weight (Mw) of the polyester resin is preferably 5,000 to 100,000. From the viewpoint of producing stable particles, the weight average molecular weight (Mw) of the polyester resin is preferably 5,000 to 80,000, and more preferably 5,000 to 50,000. The weight average molecular weight (Mw) can be measured by the following method.

The weight average molecular weight (Mw) of the polyester resin is a value measured by the following method.
(Measurement method of weight average molecular weight (Mw))
It measures according to following (1)-(3).
(1) A polyester resin is applied to release paper and dried at 100 ° C. for 2 minutes to obtain a film-like polyester resin.
(2) The film-like polyester resin obtained in the above (1) is dissolved in tetrahydrofuran so as to have a solid content of 0.2% by mass.
(3) Under the following conditions, the weight average molecular weight (Mw) of the polyester resin is measured as a standard polystyrene equivalent value using gel permeation chromatography (GPC).
(conditions)
GPC: HLC-8220 GPC [manufactured by Tosoh Corporation]
Column: 4 TSK-GEL GMHXL used Mobile phase solvent: Tetrahydrofuran (THF)
Flow rate: 0.6 ml / min
Column temperature: 40 ° C

  As a polyurethane resin, the compound obtained by reaction of polyisocyanate and a polyhydric alcohol is mentioned, for example.

  Examples of the polyisocyanate include polyfunctional isocyanates such as aromatic polyisocyanate typified by tolylene diisocyanate, diphenylmethane isocyanate, polymethylene polyphenylene polyisocyanate, aliphatic polyisocyanate typified by hexamethylene diisocyanate, xylene isocyanate, and the like. Can be mentioned. Polyisocyanate may be used individually by 1 type and may use 2 or more types together.

  Examples of the polyhydric alcohol include polyether polyol, polyester polyol, polyacrylate polyol, and polycarbonate polyol. A polyhydric alcohol may be used individually by 1 type, and may use 2 or more types together.

  From the viewpoint of dispersibility or solubility in an aqueous medium, it is preferable to use a polyhydric alcohol having an anionic functional group as the polyhydric alcohol. By reacting a polyhydric alcohol having an anionic functional group with the polyisocyanate, an anionic functional group can be introduced into the polyurethane resin.

  Examples of the polyhydric alcohol having an anionic functional group include glyceric acid, dioxymaleic acid, dioxyfumaric acid, tartaric acid, dimethylolpropionic acid, dimethylolbutanoic acid, 2,2-dimethylolvaleric acid, and 2,2-diethyl. Examples include aliphatic carboxylic acids such as methylolpentanoic acid, 4,4-di (hydroxyphenyl) valeric acid, and 4,4-di (hydroxyphenyl) butyric acid, and aromatic carboxylic acids such as 2,6-dioxybenzoic acid. .

Polyurethane resins include polyester urethane resins having ester bonds in the main chain structure, polyether urethane resins having ether bonds in the main chain structure, and ester / ether systems having ester bonds and ether bonds in the main chain structure. It is preferable to use a urethane resin.
In the present specification, the main chain of the resin means a portion extended by a reaction between polymerizable unsaturated groups.

A polyurethane resin synthesized by a known synthesis method or a commercially available product may be used. Examples of commercially available products include “Hydran ADS-110”, “Hydran ADS-120”, “Hydran KU-400SF”, “Hydran HW-311”, “Hydran HW-312B”, and “Hydran HW” manufactured by DIC Corporation. -333 "," Hydran AP-20 "," Hydran APX-101H "," Hydran AP-60LM "," Superflex 107M "," Superflex 150 "," Superflex 150HS "manufactured by Daiichi Kogyo Seiyaku Co., Ltd. "," Superflex 210 "," Superflex 410 "," Superflex 420NS "," Superflex 460 "," Superflex 460S "," Superflex 700 "," Superflex 750 "," Superflex " 40 ”,“ Takelac W-6010 ”,“ Takelac W-6020 ”,“ Takelac W-511 ”,“ Takelac WS-6021 ”,“ Takelac WS-5000 ”manufactured by Mitsui Chemicals, Inc. Examples include “NeoRez R9679”, “NeoRez R9637”, “NeoRez R966”, and “NeoRez R972”.
Among these, from the viewpoint of dispersibility or solubility in an aqueous medium, “Superflex 150” manufactured by Daiichi Kogyo Seiyaku Co., Ltd. is preferable as a commercially available polyurethane resin.

  The weight average molecular weight (Mw) of the polyurethane resin is preferably 5,000 to 100,000. From the viewpoint of producing stable particles, the weight average molecular weight (Mw) of the polyurethane resin is preferably 5,000 to 80,000, and more preferably 5,000 to 50,000. In addition, the weight average molecular weight (Mw) of a polyurethane resin can be measured by the method similar to the measuring method of the weight average molecular weight of the above-mentioned polyester resin.

  From the viewpoint of improving the adhesion to the optical functional layer and the substrate, the content of the specific resin other than the (meth) acrylic resin in the resin composition is 5.0 with respect to the total mass of the solid content of the resin composition. The mass% is preferably 80.0 mass%, more preferably 10.0 mass% to 60.0 mass%.

  The ratio of the specific resin other than the (meth) acrylic resin used for seed polymerization is preferably 60.0% by mass or more based on the total mass of the specific resin other than the specific (meth) acrylic resin contained in the resin composition. . When the ratio of the specific resin other than the (meth) acrylic resin used for seed polymerization is 60.0% by mass or more, the entanglement between the specific (meth) acrylic resin and the specific resin other than the (meth) acrylic resin is sufficiently formed. Therefore, the adhesiveness to both the optical functional layer and the substrate tends to be improved. From the same viewpoint, the ratio of the specific resin other than the (meth) acrylic resin used for seed polymerization is more preferably 80.0% by mass or more, and further preferably 90.0% by mass or more.

<Aqueous medium>
The precursor mixture used in the resin composition of the present invention contains an aqueous medium. The aqueous medium is not particularly limited and can be appropriately selected depending on the purpose. Examples of the aqueous medium include water, a mixed solution of water and an alcohol solvent, and the like.
Examples of the alcohol solvent include methyl alcohol, ethyl alcohol, and propyl alcohol.
Of these, water is preferable as the aqueous medium from the viewpoint of the stability of the resin particles.
From the viewpoint of work efficiency, the resin composition of the present invention preferably contains an aqueous medium, and more preferably contains an aqueous medium derived from the precursor mixture.
When the resin composition of the present invention contains an aqueous medium, the specific (meth) acrylic resin and the specific resin other than the (meth) acrylic resin are dispersed in the aqueous medium to form resin particles.

  The content of the aqueous medium in the precursor mixture used in the resin composition of the present invention and the resin composition of the present invention is not particularly limited, and is 60.0% by mass to 95.0% with respect to the total mass of the resin composition. % By mass is preferable, 65.0% by mass to 90.0% by mass is more preferable, and 70.0% by mass to 85.0% by mass is still more preferable.

<Chain transfer agent>
The precursor mixture used in the resin composition of the present invention contains a chain transfer agent. When a chain transfer agent is added and a monomer that is a constituent of a specific (meth) acrylic resin is seed-polymerized using a specific resin other than a (meth) acrylic resin as a seed resin, the chain transfer agent must be added. Instead, the weight average molecular weight (Mw) of the specific (meth) acrylic resin obtained can be kept low compared to the case where seed polymerization is performed. Thereby, it becomes possible to give moderate softness to the primer layer formed from the resin composition of this invention, and there exists a tendency to exhibit stress relaxation.
The chain transfer agent is not particularly limited, and examples thereof include mercaptans such as n-dodecyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, 2-ethylhexyl thioglycolate, 2,3-dimethylcapto-1-propanol, and allyl acetate. And allyl compounds such as α-methylstyrene dimer and allyl carbinol.
Among these, from the viewpoint of imparting appropriate softness to the primer layer, the chain transfer agent is preferably at least one of n-dodecyl mercaptan and 2-mercaptoethanol.

The precursor mixture used in the resin composition of the present invention is a chain transfer agent that is 0.05 to 5.0 parts by mass with respect to a total of 100 parts by mass of the monomers constituting the (meth) acrylic resin. Including. When the content of the chain transfer agent is less than 0.05 parts by mass, the weight average molecular weight (Mw) of the obtained specific (meth) acrylic resin tends to be large, and the chain transfer agent is formed from the resin composition of the present invention. The primer layer becomes too hard, and it is difficult to sufficiently exhibit stress relaxation. Moreover, when the content of the chain transfer agent exceeds 5.0 parts by mass, the weight average molecular weight (Mw) of the obtained specific (meth) acrylic resin tends to be small, and it is formed from the resin composition of the present invention. There is a possibility that the applied primer layer becomes too soft and easily peels off from the base material and the optical functional layer.
From the above viewpoint, the content of the chain transfer agent is preferably 0.05 parts by mass to 4.0 parts by mass, more preferably 0.1 parts by mass to 3.5 parts by mass, and 0.25 parts by mass to 3. parts by mass. 0 parts by mass is more preferable, and 0.3 part by mass to 3.0 parts by mass is particularly preferable.

(Polymerization initiator)
The precursor mixture used in the resin composition of the present invention preferably further contains a polymerization initiator. Any known polymerization initiator can be used without particular limitation as long as it can be used in an ordinary polymerization method. Examples of the polymerization initiator include peroxides having a sulfonyl group represented by ammonium persulfate, sodium persulfate, and potassium persulfate, peroxides having no sulfonyl group represented by hydrogen peroxide, and benzoyl peroxide. Lauroyl peroxide, di-t-butylperoxyhexahydroterephthalate, t-butylperoxy-2-ethylhexanoate, 1,1-t-butylperoxy-3,3,5-trimethylcyclohexane, t- Organic peroxides having no sulfonyl group, such as butyl peroxyisopropyl carbonate, t-butyl hydroperoxide, cumene hydroperoxide, t-butyl peroxypivalate, t-hexyl peroxypivalate, azo Bisisobutyronitrile, azobis-4-methoxy-2,4-dimethylva Ronitoriru, azo-bis cyclohexanone-1-carbonitrile, azo dibenzoyl, azo compounds such as 4,4'-azobis (4-cyanovaleric acid).
From the viewpoint of acting as a crosslinking catalyst for the melamine-based crosslinking agent, the polymerization initiator preferably includes at least one peroxide having a sulfonyl group, and at least selected from ammonium persulfate, sodium persulfate, and potassium persulfate. It is more preferable that 1 type is included.
A polymerization initiator may be used individually by 1 type, and may use 2 or more types together.

Content of the polymerization initiator used for the resin composition of this invention has the range of 0.1 mass part-5.0 mass parts with respect to a total of 100 mass parts of the monomer which comprises a (meth) acrylic resin. preferable.
When the content of the polymerization initiator is in the range of 0.1 to 5.0 parts by mass, a (meth) acrylic resin can be efficiently formed.
From the above viewpoint, the content of the polymerization initiator is preferably 0.2 parts by mass to 3.0 parts by mass, and more preferably 0.3 parts by mass to 0.7 parts by mass.

<Reactive emulsifier>
The precursor mixture used in the resin composition of the present invention preferably further contains a reactive emulsifier. The precursor mixture used in the resin composition of the present invention reacts with an aqueous medium, a specific resin other than the (meth) acrylic resin, a chain transfer agent, and a monomer constituting the specific (meth) acrylic resin. By including a functional emulsifier, the emulsion stability during polymerization tends to be good, and the dispersion state of the resin particles in the resin composition tends to be uniform. Therefore, in the primer layer formed from the resin composition of the present invention, the adhesion to both the optical functional layer and the substrate tends to be improved.
In the present specification, the reactive emulsifier means a surfactant having at least one ethylenically unsaturated group.
Moreover, when the precursor mixture used for the resin composition of the present invention contains a reactive emulsifier, the monomer constituting the specific (meth) acrylic resin and the reactive emulsifier are bonded via an ethylenically unsaturated group. A specific copolymerized (meth) acrylic resin is produced.
However, the monomer constituting the specific (meth) acrylic resin and the reactive emulsifier have low reactivity. Therefore, there are few reactive emulsifiers which comprise specific (meth) acrylic resin.
Therefore, as described above, the content of each structural unit in the (meth) acrylic resin means the content of all structural units excluding the structural unit derived from the reactive emulsifier.

The reactive emulsifier is not particularly limited as long as it is a surfactant having an ethylenically unsaturated group, and known ones can be used. Examples of the reactive emulsifier include an anionic surfactant having an ethylenically unsaturated group, a nonionic surfactant having an ethylenically unsaturated group, a cationic surfactant having an ethylenically unsaturated group, and an ethylenically unsaturated group. Examples include amphoteric surfactants having a saturated group. Among these, from the viewpoint of the stability of the resin particles, as the reactive emulsifier, at least one of an anionic surfactant having an ethylenically unsaturated group and a nonionic surfactant having an ethylenically unsaturated group should be used. It is preferable to use a nonionic surfactant having an ethylenically unsaturated group.
A reactive emulsifier may be used individually by 1 type, and may use 2 or more types together.

  Examples of the anionic surfactant having an ethylenically unsaturated group include alkyl ether sulfates such as polyoxyethylene-1- (allyloxymethyl) alkyl ether ammonium sulfate, and alkylbenzene ether sulfates such as polyoxyethylene nonylpropenyl phenyl ether ammonium sulfate. And alkyl phosphate esters such as polyoxyethylene alkyl ether phosphate esters. From the viewpoint of polymerizability, alkyl ether sulfates are preferred as the anionic surfactant having an ethylenically unsaturated group.

  As an anionic surfactant having an ethylenically unsaturated group, “Latemul PD-104” manufactured by Kao Corporation, “AQUALON KH-10”, “AQUALON HS-10” manufactured by Daiichi Kogyo Seiyaku Co., Ltd., “ "AQUALON BC-10", "ADEKA rear soap SR-10", "ADEKA rear soap SR-20", "ADEKA rear soap SE-10N", "ADEKA rear soap PP-70" manufactured by ADEKA CORPORATION, Japan Emulsifier Stock Examples thereof include those commercially available under the product names such as “Antox MS-60” and “Antox MS-2N” manufactured by the company.

  Examples of the nonionic surfactant having an ethylenically unsaturated group include alkyl ethers such as polyoxyethylene alkyl ether, and alkylbenzene ethers such as polyoxyethylene nonylpropenyl phenyl ether. From the viewpoint of polymerizability, the reactive nonionic surfactant is preferably polyoxyethylene alkyl ether.

  Examples of the nonionic surfactant having an ethylenically unsaturated group include “ADEKA rear soap ER-10”, “ADEKA rear soap ER-20”, “ADEKA rear soap ER-30”, and “ADEKA rear” manufactured by ADEKA Corporation. What is marketed by product names, such as soap ER-40, is mentioned.

  From the viewpoint of dispersibility of the (meth) acrylic resin in an aqueous medium, the content of the reactive emulsifier is 3.0 parts by mass with respect to a total of 100 parts by mass of the monomers constituting the (meth) acrylic resin. -33.0 mass parts is preferable, 5.0 mass parts-20.0 mass parts is more preferable, 7.0 mass parts-15.0 mass parts is still more preferable.

<Non-reactive emulsifier>
The precursor mixture used in the resin composition of the present invention may further contain a non-reactive emulsifier. In addition to the monomer constituting the aqueous medium, the specific resin other than the (meth) acrylic resin, the chain transfer agent, and the specific (meth) acrylic resin, the precursor mixture used for the resin composition of the present invention When a reactive emulsifier is included, the emulsion stability during polymerization tends to be good, and the dispersed state of the resin particles in the resin composition tends to be uniform. Therefore, in the primer layer formed from the resin composition of the present invention, the adhesion to both the optical functional layer and the substrate tends to be improved.
In the present specification, the non-reactive emulsifier means a surfactant having no ethylenically unsaturated group.

The non-reactive emulsifier used in the resin composition is not particularly limited as long as it is a surfactant having no ethylenically unsaturated group, and known ones can be used.
Examples of the non-reactive emulsifier include an anionic surfactant having no ethylenically unsaturated group, a nonionic surfactant having no ethylenically unsaturated group, and a cationic having no ethylenically unsaturated group Surfactant and amphoteric surfactant which does not have an ethylenically unsaturated group are mentioned. Among these, from the viewpoint of the stability of the resin particles, the non-reactive emulsifier includes an anionic surfactant having no ethylenically unsaturated group and a nonionic surfactant having no ethylenically unsaturated group. It is preferable to use at least one, and it is more preferable to use an anionic surfactant having no ethylenically unsaturated group and a nonionic surfactant having no ethylenically unsaturated group.
A non-reactive emulsifier may be used individually by 1 type, and may use 2 or more types together.

  Examples of the anionic surfactant having no ethylenically unsaturated group include alkylbenzene sulfonates such as sodium dodecylbenzene sulfonate, alkyl sulfate esters such as sodium lauryl sulfate, polyoxyethylene lauryl ether sodium sulfate, polyoxy Examples thereof include polyoxyethylene alkyl ether sulfates such as ethylene polycyclic phenyl ether, fatty acid salts such as sodium stearate soap, and cellulose derivatives such as carboxymethyl cellulose. From the viewpoint of polymerizability, an anionic surfactant having no ethylenically unsaturated group is preferably an alkyl sulfonate.

  Examples of anionic surfactants that do not have an ethylenically unsaturated bond include “Neopelex G-15”, “Neopelex G-25” and “Neopelex G-65” manufactured by Kao Corporation. The thing marketed is mentioned.

Nonionic surfactants having no ethylenically unsaturated bonds include polyoxyethylene polycyclic phenyl ethers such as polyoxyethylene biphenyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, and polyoxyalkylene alkyl ethers. Polyoxyalkylene derivatives such as sorbitan fatty acid esters such as sorbitan monolaurate, glycerin fatty acid esters such as glycerol monostearate, polyoxyethylene fatty acid esters such as polyethylene glycol monolaurate, cellulose such as methylcellulose, ethylcellulose, hydroxypropylcellulose, etc. Derivatives and the like.
From the viewpoint of polymerizability, the nonionic surfactant having no ethylenically unsaturated bond is preferably polyoxyethylene alkyl ether.

  Nonionic surfactants having no ethylenically unsaturated bonds include “Emulgen A-60”, “Emulgen A-90”, “Emulgen B-66” manufactured by Kao Corporation, and Daiichi Kogyo Seiyaku Co., Ltd. "Neugen EA-197D", "Neugen EA-207D" and the like are commercially available.

  From the viewpoint of dispersibility of the specific (meth) acrylic resin in an aqueous medium, the content of the non-reactive emulsifier is 3.0 with respect to a total of 100 parts by mass of the monomers constituting the (meth) acrylic resin. Mass parts to 30.0 parts by mass are preferable, 5.0 parts by mass to 20.0 parts by mass are more preferable, and 8.0 parts by mass to 15.0 parts by mass are even more preferable.

  The precursor mixture used in the resin composition of the present invention preferably contains at least one reactive emulsifier, and more preferably contains at least one reactive emulsifier and at least one non-reactive emulsifier. When the precursor mixture has the above-described configuration, the emulsion stability during polymerization tends to be good, and the dispersion state of the resin particles in the resin composition tends to be uniform. Therefore, in the primer layer formed from the resin composition of the present invention, the adhesion to both the optical functional layer and the substrate tends to be improved.

  The precursor mixture used in the resin composition of the present invention may contain other components other than those described above as necessary. Examples of other components include various additives such as antioxidants, antistatic agents, pH adjusters, antifoaming agents, ultraviolet absorbers, light stabilizers, and water-dispersed fillers.

<Crosslinking agent>
The resin composition of the present invention contains a crosslinking agent. Since the crosslinking agent reacts with the crosslinkable functional group in the specific (meth) acrylic resin to form a crosslinked structure, the primer layer formed from the resin composition of the present invention can be given appropriate hardness. It becomes possible. For this reason, the primer layer formed from the resin composition of the present invention can suppress peeling from the optical functional layer and the substrate.

The crosslinking agent is not particularly limited as long as it can crosslink a specific (meth) acrylic resin. Epoxy crosslinking agent, water-dispersible isocyanate crosslinking agent, melamine crosslinking agent, carbodiimide crosslinking agent, oxazoline crosslinking agent Well-known things, such as a metal chelate type crosslinking agent, can be used.
Among these, as the crosslinking agent, from the viewpoint of the reactivity with the crosslinking functional group and the physical properties of the coating film after the crosslinking reaction, at least one selected from a blocked isocyanate crosslinking agent and a melamine crosslinking agent is preferable, A melamine type crosslinking agent is more preferable.
A crosslinking agent may be used individually by 1 type, and may use 2 or more types together.

Examples of melamine-based crosslinking agents include methylol melamine resins obtained by condensing melamine or melamine derivatives and formaldehyde, etherified melamine resins partially or completely etherified by reacting methylol melamine with a lower alcohol, A mixture etc. are mentioned. A melamine type crosslinking agent may be used individually by 1 type, and may use 2 or more types together.
Among these, from the viewpoint of the reactivity with the crosslinkable functional group and the physical properties of the coating film after the crosslinking reaction, a methylol melamine resin is preferable as the melamine-based crosslinking agent.

  A commercially available product may be used as the melamine-based crosslinking agent. Examples of commercially available products are those marketed under trade names such as “Nikarak MW-12LF”, “Nikarak MW-22”, “Nikarak MW-30”, “Nikarak MX-035” manufactured by Sanwa Chemical Co., Ltd. Is mentioned.

  The water-dispersible isocyanate-based crosslinking agent is an isocyanate compound that can function as a crosslinking agent after being mixed with an aqueous medium and allowed to stand for a certain time, for example, 2 hours.

  As the water-dispersible isocyanate-based crosslinking agent, for example, a polyisocyanate compound having two or more isocyanate groups in one molecule is modified with a hydrophilic group such as a polyethylene oxide, a carboxyl group or a sulfonic acid group to be a self-emulsifying type. The compound in the form (hereinafter also referred to as “self-emulsifying type isocyanate cross-linking agent”), or the compound in the form that is emulsified with a surfactant or the like and made water-dispersible (hereinafter referred to as “forced emulsification type isocyanate cross-linking agent”). ")").

Among the self-emulsifying isocyanate-based crosslinking agent and forced emulsification-type isocyanate-based crosslinking agent, the water-dispersible isocyanate-based crosslinking agent used in the resin composition of the present invention is a blocking agent so that isocyanate groups do not react with an aqueous medium. A blocked isocyanate-based crosslinking agent protected with
When the crosslinking agent contained in the resin composition of the present invention is a blocked isocyanate crosslinking agent, the crosslinking reaction proceeds stably and tends to be excellent in easy adhesion.

Examples of the polyisocyanate compound in the water-dispersible isocyanate crosslinking agent include, for example, xylylene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, aromatic polyisocyanate compounds represented by tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, Chain or cyclic aliphatic polyisocyanate compounds typified by hydrogenated aromatic polyisocyanate compounds, burettes, dimers, trimers or pentamers of these polyisocyanate compounds, these polyisocyanates Examples thereof include adducts of a compound and a polyol compound such as trimethylolpropane.
These water-dispersible isocyanate crosslinking agents may be used alone or in combination of two or more.

  More specifically, examples of the polyisocyanate compound in the water-dispersible isocyanate crosslinking agent include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, hydrogenated tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, hexamethylene diisocyanate, diphenylmethane-4,4-diisocyanate, isophorone diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, tetramethylxylylene diisocyanate, 1,5-naphthalene diisocyanate, triphenyl Methane triisocyanate, adducts of these polyisocyanate compounds and polyol compounds such as trimethylolpropane, and views of these polyisocyanate compounds Tsu door body and isocyanurate body, and the like.

  Examples of the blocking agent include known blocking agents such as phenols, alkylphenols, active methylene compounds, oximes, lactams, bisulfites, and imidazoles.

  A commercially available product may be used as the water-dispersible isocyanate crosslinking agent. Among the water-dispersible isocyanate crosslinking agents, commercially available block isocyanate crosslinking agents include, for example, “Desmodule BL1100”, “Desmodule BL1265 MPA / X”, “Desmodule VPLS2253”, “Dessole” manufactured by Covestro. Module BL3475 BA / SN, Death Module BL3272 MPA, Death Module BL3370 MPA, Death Module BL4265 SN, Desmotherm 2170, Sumijour BL3175, Takenate B-830N manufactured by Mitsui Chemicals, Inc. ”,“ Takenate B-815N ”,“ Takenate B-820NSU ”,“ Takenate B-846N ”,“ Takenate B-870N ”,“ Takenate B-874N ”,“ Takenate B-882N ”,“ Takenai ” To B-883NS "," Takenate WB-3936 ", and" Takenate WB-3021 ".

  As a commercial item of water-dispersible isocyanate type crosslinking agents other than the block isocyanate type crosslinking agent, for example, “Duranate WB40-100”, “Duranate WT20-100”, “Duranate WT30-100” manufactured by Asahi Kasei Chemicals Corporation, “ "Duranate WL70-100", "Duranate WR80-70P", "Duranate WE50-100", Takenate WD-720, Takenate WD-723, Takenate WD-725, Takenate WD-726, Takenate WD-730, manufactured by DIC Corporation “Burnock DNW-5000”, “Burnock DNW-6000”, “Bihijul 3100”, “Bihijur VPLS2306”, “Bihijul VPLS2319”, “Bihijur VPLS” manufactured by Covestro 336 ”,“ Baihijoule VPLS2150 / 1 ”,“ Baihijoule VPLS2150RA ”,“ Baihijoule BL5140 ”,“ Baihijoule BL5235 ”,“ Baihijoule VPLS2240 ”,“ Baihijoule VPLS2310 ”,“ Elastolon BN-04 ”,“ “Elastolon BN-11”, “Elastolon BN-27”, “Elastolon BN-69”, “Elastolon BN-77”, “Aquanate 100”, “Aquanate 105”, “Aquanate 110” manufactured by Tosoh Corporation “Aquanate 120”, “Aquanate 130”, “Aquanate 200”, “Aquanate 210” may be mentioned.

  Content of the crosslinking agent used for the resin composition of this invention is 0.3 mass part-50.0 mass parts with respect to 100 mass parts of specific (meth) acrylic resins. When the content of the cross-linking agent is less than 0.3 part by mass, the cross-linking reaction between the cross-linkable functional group and the cross-linking agent is poor, a sufficient cross-linking structure cannot be obtained, and adhesion to the optical functional layer and the substrate. May not be possible. When the content of the crosslinking agent exceeds 50.0 parts by mass, the crosslinking reaction with the crosslinkable functional group, the reaction between the crosslinking agents proceeds excessively, and the primer layer formed from the resin composition of the present invention It may become too hard and the adhesiveness with respect to an optical functional layer and a base material may not be obtained.

  As a crosslinking agent used for the resin composition of the present invention, when a water-dispersible isocyanate-based crosslinking agent is included, the content of the water-dispersible isocyanate-based crosslinking agent is 100 parts by mass of the specific (meth) acrylic resin, 10.0 mass parts-40.0 mass parts are preferable, and 10.0 mass parts-30.0 mass parts are more preferable.

  When a melamine-based crosslinking agent is included as a crosslinking agent used in the resin composition of the present invention, the content of the melamine-based crosslinking agent is 0.5 parts by mass to 100 parts by mass of the specific (meth) acrylic resin. 40.0 mass parts is preferable, 1.0 mass part-30.0 mass parts are more preferable, and 2.0 mass parts-10.0 mass parts are still more preferable.

<Sulfate ion>
The resin composition of the present invention preferably further contains sulfate ions.
When the resin composition of the present invention contains sulfate ions and contains a melamine-based crosslinking agent as a crosslinking agent, the sulfate ions act as an acid catalyst, and the crosslinking reaction of the melamine-based crosslinking agent tends to proceed appropriately. is there. Thereby, moderate hardness is provided to the primer layer formed from the resin composition of this invention, and there exists a tendency for the adhesiveness with respect to an optical functional layer and a base material layer to improve.
There is no particular limitation on the method for containing the sulfate ion in the resin composition of the present invention, and examples include a method using a peroxide having a sulfonyl group as a polymerization initiator, and a method of containing a sulfate or the like in the composition. It is done.
In addition, the peroxide which has a sulfonyl group is synonymous with the peroxide which has the sulfonyl group in the said polymerization initiator, and its preferable range is also the same.

The sulfate is not particularly limited as long as sulfate ions can be generated in an aqueous medium, and examples thereof include water-soluble sulfates such as ammonium sulfate, sodium sulfate, and magnesium sulfate. Among these, ammonium sulfate is preferable as the sulfate from the viewpoint of stably forming a crosslinked structure and improving adhesiveness.
When the resin composition of this invention contains a sulfate, as content of a sulfate, the range of 0.4 mass part-1.0 mass part is preferable with respect to 100 mass parts of specific (meth) acrylic resins.

In the resin composition of the present invention, the sulfate ion content is preferably in the range of 0.1 to 1.5 parts by mass with respect to 100 parts by mass of the specific (meth) acrylic resin. When the content of sulfate ions is within the above range, the reaction between the crosslinkable functional group and the crosslinking agent becomes good, and a sufficient crosslinked structure can be obtained.
From the above viewpoint, the content of sulfate ions is more preferably in the range of 0.2 parts by mass to 1.0 part by mass, and still more preferably in the range of 0.2 parts by mass to 0.6 parts by mass.
As a method for measuring sulfate ions, a known method can be used, and for example, it can be measured by the following method.

The sulfate ion content of the resin composition is a value measured by the following method.
(Measurement method of sulfate ion content)
It measures according to following (1)-(2).
(1) As a mobile phase solvent, 8.0 mmol / L of p-hydroxybenzoic acid, 3.2 mmol / L of bis (2-hydroxyethyl) iminotris (hydroxymethyl) methane, and boric acid with respect to deionized water. Is dissolved to a concentration of 50 mmol / L.
(2) The resin composition is mixed with the mobile phase solvent obtained in (1) so that the solid content is 0.2% by mass.
(3) The amount of sulfate ion in the resin composition is measured using ion chromatography (IC) under the following conditions.
(conditions)
IC: Prominence CDD-10Avp (manufactured by Shimadzu Corporation)
Column: Shim-pack IC-A3
Detector: Electrical conductivity detector (non-suppressor method)
Mobile phase solvent: adjusted to a concentration of 8.0 mmol / L p-hydroxybenzoic acid, 3.2 mmol / L bis (2-hydroxyethyl) iminotris (hydroxymethyl) methane, and 50 mmol / L boric acid. Aqueous solution flow rate: 1.2 ml / min
Injection volume: 50 μL
Column temperature: 40 ° C

<Other ingredients>
The resin composition of the present invention may contain other components other than those described above as necessary. Examples of other components include various additives such as antioxidants, antistatic agents, pH adjusters, antifoaming agents, ultraviolet absorbers, light stabilizers, and water-dispersed fillers.

<< Production Method of Resin Composition >>
The method for producing a resin composition of the present invention includes an aqueous medium, a resin other than a (meth) acrylic resin, a monomer constituting the (meth) acrylic resin, selected from a water-soluble resin and a water-dispersible resin,
A chain transfer agent that is 0.05 to 5.0 parts by mass with respect to a total of 100 parts by mass of the monomers constituting the (meth) acrylic resin, in the precursor mixture containing the (meth) acrylic A step of polymerizing monomers constituting the resin to obtain a dispersion of the (meth) acrylic resin (hereinafter also referred to as “seed polymerization step”);
A step of mixing the dispersion of the (meth) acrylic resin and a crosslinking agent that is 0.3 to 50.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin (hereinafter referred to as “mixing step” "), And
The said (meth) acrylic resin contains 0.1 mass%-50.0 mass% of the structural unit derived from the monomer which has a crosslinkable functional group with respect to all the structural units.

Hereafter, the process in the manufacturing method of this embodiment is demonstrated in detail.
In addition, since the specific example of a component used at each process and a preferable aspect are as having described in each item of the resin composition, description is abbreviate | omitted here.

(Seed polymerization process)
In the seed polymerization step, in the presence of an aqueous dispersion of a resin other than a (meth) acrylic resin selected from a water-soluble resin and a water-dispersible resin, the total amount of monomers constituting the (meth) acrylic resin is 100 parts by mass. On the other hand, a step of adding a chain transfer agent in an amount of 0.05 to 5.0 parts by mass to polymerize a monomer constituting the (meth) acrylic resin is included.
That is, in the seed polymerization step, a dispersion of a specific (meth) acrylic resin having a structure in which a specific (meth) acrylic resin and a specific resin other than the (meth) acrylic resin are intertwined with each other is obtained.

The polymerization method in the seed polymerization step (hereinafter also referred to as “seed polymerization method”) is not particularly limited, and a known method can be used.
As the seed polymerization method, for example, in a reaction vessel equipped with a thermometer, a stirring rod, a reflux condenser, a dropping funnel, etc., a specific resin other than a (meth) acrylic resin that becomes a seed in a nitrogen stream, water, etc. The aqueous solvent is charged, and the temperature in the reaction vessel is raised. Then, after pre-emulsifying with a monomer component of a specific resin other than the (meth) acrylic resin to be a seed, a reactive emulsifier, and an aqueous medium such as water to obtain a pre-emulsion, the obtained pre-emulsion is Examples thereof include a method of dropping in a container, adding a specific amount of a chain transfer agent, and appropriately adding a polymerization initiator, a reducing agent, etc. to advance the polymerization reaction.

For example, the polymerization temperature in the seed polymerization step is preferably 40 ° C to 100 ° C, and more preferably 50 ° C to 100 ° C.
For example, the polymerization time in the seed polymerization step is preferably 1 hour to 8 hours, and more preferably 2 hours to 6 hours.
The stirring time after adding the polymerization initiator as an aqueous solution is preferably 40 to 100 ° C. for 1 to 8 hours, and 50 to 100 ° C. for 2 to 6 hours from the viewpoint of reducing the residual monomer. More preferred.
It is preferable to add the polymerization initiator in two or more times. The temperature and the polymerization time at the last addition are preferably 40 ° C. to 100 ° C., 1 hour to 8 hours, 50 ° C. to 100 ° C., 1 Time to 8 hours are more preferable.

  In the seed polymerization step, various additives such as a polymerization initiator, a reducing agent, a chain transfer agent, and a pH adjuster may be used.

(Reducing agent)
In the seed polymerization step, a reducing agent may be used together with the polymerization initiator.
Examples of the reducing agent include sodium metabisulfite, sodium sulfite, sodium hydrogen sulfite, sodium pyrosulfite, sodium pyrophosphate, thioglycolic acid, sodium thiosulfate, ascorbic acid, tartaric acid, citric acid, and glucose.
When using a reducing agent in a seed polymerization process, a reducing agent may be used individually by 1 type, and may use 2 or more types together.

  The reducing agent is used in an amount usually used. As a usage-amount of a reducing agent, 0.1 mass part-2.0 mass parts are preferable with respect to 100 mass parts of total amounts of a monomer, and 0.3 mass part-1.5 mass parts are more preferable.

  The “seed polymerization step” in the method for producing a resin composition of the present invention is, for example, a step of dispersing or dissolving a resin other than a (meth) acrylic resin selected from a water-soluble resin and a water-dispersible resin in an aqueous medium (hereinafter referred to as “the seed polymerization step”). , Also referred to as “specific resin preparation step other than (meth) acrylic resin”) and a step of obtaining a monomer mixture by mixing monomers constituting (meth) acrylic resin (hereinafter referred to as “pre-emulsion step”) May be included).

(Specific resin preparation process other than (meth) acrylic resin)
The specific resin preparation step other than the (meth) acrylic resin is performed by mixing and stirring the specific resin other than the (meth) acrylic resin used in the resin composition of the present invention while adding an aqueous medium. A step of preparing an aqueous dispersion of a specific resin other than the resin. There is no restriction | limiting in particular about the method of mixing and stirring, Dispersing machines, such as a generally used mixing stirring apparatus and an ultrasonic disperser, a high-pressure homogenizer, can be used as needed.

(Pre-emulsion process)
In the pre-emulsion process, a mixture of monomers constituting a (meth) acrylic resin (specific (meth) acrylic resin) containing at least a monomer having a crosslinkable functional group is emulsified and dispersed in the presence of a reactive emulsifier. And a step of obtaining a pre-emulsion in which the monomer particles constituting the specific (meth) acrylic resin are emulsified and dispersed.

(Mixing process)
The mixing step includes a dispersion of the specific (meth) acrylic resin obtained in the seed polymerization step, and a crosslinking agent that is 0.3 to 50.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin. And a step of mixing.
There is no restriction | limiting in particular as a mixing method of the dispersion liquid of specific (meth) acrylic resin, and a crosslinking agent, A well-known method can be selected suitably. From the viewpoint of the uniformity of the crosslinking reaction, it is preferable to add and mix the crosslinking agent while stirring the dispersion of the specific (meth) acrylic resin.

(Other processes)
The manufacturing method of this embodiment may have other processes other than the resin preparation process other than (meth) acrylic resin, a pre-emulsion process, and a seed polymerization process as needed.

When the resin composition of the present invention contains resin particles in which a specific (meth) acrylic resin is dispersed in an aqueous medium, the average primary particle diameter of the resin particles is uniform when a primer layer is formed. From the viewpoint, 150 nm or less is preferable, 120 nm or less is more preferable, and 100 nm or less is still more preferable. If the average primary particle diameter of the resin particles is 150 nm or less (more preferably 120 nm or less, more preferably 100 nm or less), the resin particles do not become too large, and a uniform film thickness is easily obtained when the primer layer is formed. It tends to be excellent in adhesiveness.
Moreover, the lower limit of the average primary particle diameter of the resin particles is not particularly limited, and is preferably 10 nm or more and more preferably 20 nm or more from the viewpoint of improving production efficiency.

In the present specification, “average primary particle diameter of resin particles contained in resin composition” means “New Experimental Chemistry Course 4 Basic Technology 3 Hikari (II)” edited by The Chemical Society of Japan, pages 725 to 741 (Showa) It is a value measured by a dynamic light scattering method described in July 20, 1951 issued by Maruzen Co., Ltd.). The specific method is as follows.
After diluting the resin composition with distilled water and sufficiently stirring and mixing, 5 ml was collected in a 10 mm square glass cell using a Pasteur pipette, and this was taken as a dynamic light scattering photometer “Zetasizer 1000HS” (Malvern Co., Ltd.). Set to (made by company). After adjusting the concentration of the diluted solution of the (meth) acrylic resin aqueous dispersion so that the decay rate of the Count Rate is 150 Cps to 200 Cps, the measurement is performed at a measurement temperature of 25 ° C. ± 1 ° C. and a light scattering angle of 90 °. The average primary particle diameter of the resin particles contained in the resin composition is obtained by computer processing of the results.

  As a use of the resin composition of the present invention, for example, in an optical film in a liquid crystal display device or the like, it can be suitably used as a primer layer interposed between a base material and an optical functional layer. The resin composition of the present invention can be suitably used as a primer layer interposed between the base material and the prism layer. The primer layer formed from the resin composition of the present invention is excellent in adhesion to the prism layer and the substrate. Among the prism layers, it is possible to exhibit excellent adhesiveness with respect to those having a particularly high hardness and a high crosslinking density.

The prism layer is generally formed from a resin composition containing urethane (meth) acrylate. As a use of the resin composition of the present invention, among prism layers, it can be more suitably used for a prism layer formed from a resin composition containing a urethane (meth) acrylate having a weight average molecular weight of 5,000 or less. .
In addition, when the weight average molecular weight of urethane (meth) acrylate is 5,000 or less, there are many urethane bonds, the crosslinking density is increased, and the prism layer tends to be hard.

<Film>
The film of this invention has a base material and the primer layer which is a crosslinked material of the resin composition of this invention. The film of this invention is excellent in the adhesiveness with respect to an optical functional layer.

The film of the present invention can be produced, for example, by applying the resin composition of the present invention to a substrate, heating and drying, and forming a primer layer by a crosslinking reaction. The crosslinking agent may be included in the resin composition in advance, or may be mixed in the resin composition before application.
The method for forming the primer layer formed on the substrate is not particularly limited, and is a known method using a gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, spray coater, etc. Is mentioned.

  In the film of the present invention, the thickness of the primer layer formed on the substrate is not particularly limited, and can be appropriately set depending on the application and required performance. The thickness of the primer layer is preferably in the range of 50 nm to 300 nm.

  In the film of the present invention, the primer layer preferably has high transparency. Specifically, for example, the total light transmittance in the visible light wavelength region (JIS K 7361 (1997)) is preferably 85% or more, and more preferably 90% or more. The haze (JIS K 7136 (2000)) of the primer layer is preferably less than 4.0%, and more preferably less than 3.7%.

There is no restriction | limiting in particular as a base material which comprises the film of this invention, if a primer layer can be formed on a base material, It can select from arbitrary materials.
Examples of the base material include polyester resins, acetate resins, polyether sulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, and acrylic resins.
Among them, a polyester resin substrate is preferable as the substrate, and a polyethylene terephthalate (PET) resin substrate is more preferable in terms of practicality.
There is no restriction | limiting in particular in the shape of a base material, According to the objective, it can select suitably. Examples of the shape of the substrate include a film shape and a sheet shape.

  There is no restriction | limiting in particular as thickness of a base material, According to a use, it can select suitably. The thickness of a general substrate is in the range of 500 μm or less, preferably in the range of 5 μm to 300 μm, and more preferably in the range of 10 μm to 200 μm.

The film of the present invention can be used as an optical film by providing an optical functional layer such as a prism layer or a light diffusion layer on the primer layer. The film of the present invention can be suitably used as an optical film provided with a prism layer as an optical functional layer.
The optical film is used, for example, as a member constituting a display device such as a liquid crystal display device or an organic EL display, an input device such as a touch panel.

  The film of the present invention can be suitably used for bonding an optical film of a liquid crystal display device. That is, the film of the present invention includes, for example, a polarizing plate, a retardation plate, an antireflection film, a viewing angle widening film, a bonding between optical films such as a brightness enhancement film, the optical film, a liquid crystal cell, and a glass substrate. It can be suitably used for bonding with a protective film or the like.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

(Production Example 1)
[Production of aqueous dispersion of (meth) acrylic resin]
In a reaction vessel equipped with a thermometer, a stirring bar, a reflux condenser, and a dropping funnel, 227.0 parts by mass of deionized exchange water and pesresin A-640 (water dispersible polyester resin, active ingredient: 25% by mass, (Takamatsu Yushi Co., Ltd.) 100.0 parts by mass (active ingredient: 25.0 parts by mass) and heated to 80 ° C. while replacing the inside of the reaction vessel with nitrogen (specification other than (meth) acrylic resin) Resin preparation step).
On the other hand, in a stirring vessel different from the reaction vessel, 42.7 parts by mass of deionized exchange water, Neoperex G-65 (chemical name: sodium dodecylbenzenesulfonate, active ingredient: 65% by mass, manufactured by Kao Corporation, Non-reactive emulsifier) 0.8 part by mass (active ingredient: 0.5 part by mass) and Adeka Soap ER-30 (nonionic reactive surfactant, active ingredient: 65% by mass, manufactured by ADEKA Corporation, reaction) 15.4 parts by mass (active emulsifier) (active ingredient: 10.0 parts by mass) and 0.5 parts by mass of N-methylolacrylamide (NMAM) were added and stirred, and then methyl methacrylate (MMA) 61. 0 parts by mass, 37.0 parts by mass of n-butyl acrylate (BA), 1.5 parts by mass of methacrylic acid (MAA), and thiocalcol 20 (NDM) (chemical name: n-dodecyl mercaptan) Active ingredient: 100% by weight, and manufactured by Kao Corporation) 0.1 parts by mass, by stirred into the mixed solution to prepare a pre-emulsion (preemulsion step).

Next, 11.9 parts by mass of a 3.0% by mass ammonium persulfate (APS, polymerization initiator) aqueous solution was added while maintaining the internal temperature of the reaction vessel at 80 ° C. to initiate the polymerization reaction. Five minutes after the addition, the pre-emulsion prepared above was added successively and uniformly over 3 hours for polymerization. The obtained polymer was aged at 80 ° C. for 2.5 hours and then cooled to room temperature, and then pH adjustment was performed using an appropriate amount of aqueous ammonia solution to obtain a (meth) acrylic resin aqueous dispersion having a pH of 8.5. (Seed polymerization step).
The obtained (meth) acrylic resin aqueous dispersion had a solid content of 26% by mass. Moreover, the average primary particle diameter of the resin particles was 30 nm. The obtained (meth) acrylic resin had a glass transition temperature (Tg) of 32.0 ° C. and a weight average molecular weight (Mw) of 1,800,000. Table 1 shows the monomer composition in Production Example 1. The glass transition temperature (Tg), the weight average molecular weight (Mw), and the average primary particle diameter of the resin particles are measured and calculated by the method described above.
The “solid content” is the amount of residue obtained by removing the aqueous medium from the (meth) acrylic resin aqueous dispersion.
The present polymerization method is seed polymerization using a polyester resin aqueous dispersion as a seed resin (seed particles).

(Production Example 2 to Production Example 26)
In Production Example 1, the monomers were changed as shown in Table 1, and the weight average molecular weight was adjusted by appropriately changing the amount of initiator and polymerization conditions, etc., and the same method as in Production Example 1, A (meth) acrylic resin aqueous dispersion was prepared. Table 1 shows the composition (mass%) of the solid content of the obtained (meth) acrylic resin aqueous dispersion, Tg and weight average molecular weight (Mw) of the (meth) acrylic resin. The glass transition temperature (Tg) and the weight average molecular weight (Mw) are measured and calculated by the method described above.
This polymerization method is seed polymerization using a polyester resin aqueous dispersion as seed particles.

(Production Example 27)
In a reaction vessel equipped with a thermometer, a stirring rod, a reflux condenser, and a dropping funnel, 227.0 parts by mass of deionized exchange water, Neoperex G-65 (chemical name: sodium dodecylbenzenesulfonate, active ingredient 65) % By mass, manufactured by Kao Corporation, non-reactive emulsifier) 0.2 parts by mass (active ingredient: 0.1 part by mass), and Adekalia soap ER-30 (nonionic reactive surfactant, active ingredient: 65 parts by mass) %, A reactive emulsifier manufactured by ADEKA CORPORATION, 3.1 parts by mass (active ingredient: 2.0 parts by mass), and the temperature in the reaction vessel was raised to 80 ° C. while replacing with nitrogen.
On the other hand, in a stirring vessel different from the reaction vessel, 42.7 parts by mass of deionized exchange water, Neoperex G-65 (chemical name: sodium dodecylbenzenesulfonate, active ingredient: 65% by mass, manufactured by Kao Corporation, Non-reactive emulsifier) 0.6 parts by mass (active ingredient: 0.4 parts by mass) and Adeka Soap ER-30 (nonionic reactive surfactant, active ingredient: 65% by mass, manufactured by ADEKA Corporation, reaction) Emulsifier) 12.3 parts by mass (active ingredient: 8.0 parts by mass) and 0.5 part by mass of N-methylolacrylamide (NMAM) were stirred, and then methyl methacrylate (MMA) 61.0 parts by mass. Part, n-butyl acrylate (BA) 37.0 parts by mass, methacrylic acid (MAA) 1.5 parts by mass, thiocalcol 20 (chemical name: n-dodecyl mercaptan, active ingredient: 10 Wt%, manufactured by Kao Corporation) By stirred into mixed solution and 0.5 parts by mass, to prepare a pre-emulsion.
Next, 11.9 parts by mass of a 3.0% by mass ammonium persulfate (APS, polymerization initiator) aqueous solution was added while maintaining the internal temperature of the reaction vessel at 80 ° C. to initiate the polymerization reaction. Five minutes after the addition, the pre-emulsion prepared above was added successively and uniformly over 3 hours for polymerization. The obtained polymer was aged at 80 ° C. for 2.5 hours and then cooled to room temperature, and then pH adjustment was performed using an appropriate amount of aqueous ammonia solution to obtain a (meth) acrylic resin aqueous dispersion having a pH of 8.5. . The obtained (meth) acrylic resin aqueous dispersion had a solid content of 26% by mass. Moreover, the average primary particle diameter of the resin particles was 30 nm. The obtained (meth) acrylic resin had a glass transition temperature (Tg) of 32.0 ° C. and a weight average molecular weight (Mw) of 1,000,000. Table 1 shows the monomer composition in Production Example 27. The glass transition temperature (Tg), the weight average molecular weight (Mw), and the average primary particle diameter of the resin particles are measured and calculated by the method described above.
This polymerization method is not a seed polymerization but a general emulsion polymerization.

(Production Example 28)
-Production of acrylic 1-
A stainless steel container is charged with 110 parts by weight of methyl methacrylate (MMA), 130 parts by weight of ethyl acrylate (EA), 60 parts by weight of methacrylic acid (MAA), and 3 parts by weight of n-dodecyl mercaptan, and mixed with stirring to prepare a mixed solution. did.
In a reaction vessel equipped with a stirrer, a reflux condenser, a thermometer and a dropping funnel, 60 parts by mass of the mixed solution prepared above and 200 parts by mass of isopropyl alcohol, 2,2′-azobis (isobutyronitrile) ( AIBN) 0.6 parts by mass was charged and heated up to reflux.
After maintaining in the reflux state for 20 minutes, a mixed solution of the remainder of the mixed solution, 50 parts by mass of isopropyl alcohol, and 1.7 parts by mass of AIBN was added dropwise over 120 minutes. 20 minutes after the completion of dropping, a mixed solution of 40 parts by mass of isopropyl alcohol and 1.7 parts by mass of AIBN was added dropwise over 120 minutes, and after completion of the addition, the reflux was maintained for 120 minutes.
After cooling until the temperature of the reaction solution reaches 50 ° C. or lower, the reaction solution is transferred to a reaction vessel equipped with a stirrer and a decompression facility, charged with 60 parts by mass of 25% by mass ammonia water and 900 parts by mass of deionized water, Then, isopropyl alcohol and unreacted monomers were recovered to obtain a (meth) acrylic resin aqueous dispersion (acrylic 1).
The obtained (meth) acrylic resin aqueous dispersion had a nonvolatile content of 23.5% by mass, a pH of 6.9, and a viscosity of 40 mPa · s. Further, the obtained aqueous solution was dried, dissolved in THF, and subjected to GPC measurement. As a result, the weight average molecular weight (Mw) was 15,000 (in terms of polystyrene).
The weight average molecular weight (Mw) is a value determined by the method described above.

[Production of aqueous dispersion of (meth) acrylic resin]
In a reaction vessel equipped with a thermometer, a stirring bar, a reflux condenser, and a dropping funnel, 240.5 parts by mass of deionized exchange water and acrylic 1 ((meth) acrylic resin aqueous dispersion, active ingredient prepared above) : 23.5% by mass) and 106.4 parts by mass (active ingredient: 25.0 parts by mass), and the temperature inside the reaction vessel was raised to 80 ° C. while purging with nitrogen.
On the other hand, in a stirring reaction vessel different from the reaction vessel, 42.7 parts by mass of deionized water and Neoperex G-65 (chemical name: sodium dodecylbenzenesulfonate, active ingredient: 65% by mass, manufactured by Kao Corporation) , Non-reactive emulsifier) 0.8 part by mass (active ingredient; 0.5 part by mass) and Adeka Reasoap ER-30 (nonionic reactive surfactant, active ingredient: 65% by mass, manufactured by ADEKA Corporation, (Reactive emulsifier) 15.4 parts by mass (active ingredient; 10.0 parts by mass) and 0.5 parts by mass of N-methylolacrylamide (NMAM) were added and stirred, and further methyl methacrylate (MMA) 61.0. Parts by mass, 37.0 parts by mass of n-butyl acrylate (BA), 1.5 parts by mass of methacrylic acid (MAA), thiocalcol 20 (chemical name: n-dodecyl mercaptan, active ingredient: A pre-emulsion was prepared by adding and stirring a solution prepared by mixing 100 parts by mass and 100 parts by mass (made by Kao Corporation).
Next, 11.9 parts by mass of a 3.0% by mass ammonium persulfate (APS, polymerization initiator) aqueous solution was added while maintaining the internal temperature of the reaction vessel at 80 ° C. to initiate the polymerization reaction. Five minutes after the addition, the pre-emulsion prepared above was added successively and uniformly over 3 hours for polymerization. The obtained polymer was aged at 80 ° C. for 2.5 hours and then cooled to room temperature, and then pH adjustment was performed using an appropriate amount of aqueous ammonia solution to obtain a (meth) acrylic resin aqueous dispersion having a pH of 8.5. . The obtained (meth) acrylic resin aqueous dispersion had a solid content of 26% by mass. Moreover, the average primary particle diameter of the resin particles was 110 nm. The obtained (meth) acrylic resin had a glass transition temperature (Tg) of 32.0 ° C. and a weight average molecular weight (Mw) of 1,000,000. Table 1 shows the monomer composition in Production Example 28. The glass transition temperature (Tg), the weight average molecular weight (Mw), and the average primary particle diameter of the resin particles are measured and calculated by the method described above.
This polymerization method is seed polymerization using acrylic 1 which is not a specific resin as a seed resin (seed particles).

Example 1
[Preparation of resin composition coating liquid]
The (meth) acrylic resin aqueous dispersion obtained in Production Example 1 and the crosslinking agent were mixed at a blending ratio shown in Table 1 to obtain a resin composition coating solution (mixing step).

[Evaluation]
-Preparation of test specimen with prism layer-
The film thickness after drying the coating liquid of the resin composition prepared above using a wire bar on an untreated PET film of 21 cm × 30 cm size (manufactured by Toray Industries, Inc., Lumirror 188T-60, thickness 188 μm) It apply | coated so that it might become 100 nm. A test piece having a PET / primer layer laminated structure obtained by heat-treating the obtained coating film at 180 ° C. for 1 minute in a hot-air circulation dryer (HISPEC-OVEN PHH-200, manufactured by ESPEC CORP.) did.
Apply a prism layer resin, manufactured as follows, as a UV curable prism resin to a prism mold (pitch 50 μm, depth 25 μm), and test the coating surface of the test piece on top of this. The pieces were bonded together and crimped using a roll laminator. Then, using a UV lamp with an irradiation intensity of 120 W / cm, UV irradiation was performed with an integrated light amount of about 500 mJ / cm ² to cure the prism layer. After curing, the test piece having a laminated structure of PET / primer layer / prism layer was peeled off from the prism molding die to obtain a test piece with a prism layer.

[Resin for prism layer]
In a reaction vessel equipped with a thermometer, a stir bar, a reflux condenser, and a dropping funnel, 110.0 parts by mass of dehydrated THF, 3002M (N) of epoxy ester (chemical name: bisphenol A oxypropylene 2 mol adduct diglycidyl ether methacrylic acid The adduct, active ingredient 100% by mass, Kyoeisha Chemical Co., Ltd.) 54.2 parts by mass and dibutyltin dilaurate 0.2 part by mass were charged, and the temperature in the reaction vessel was raised to 40 ° C. while purging with nitrogen. While maintaining the internal temperature of the reaction vessel at 40 ° C., 42.0 parts by weight of Duranate TPA-100 (isocyanurate type polyisocyanate, active ingredient 100% by mass, manufactured by Asahi Kasei Chemicals Co., Ltd.) was uniformly added over 2 hours. Reacted. Then, it stirred at 40 degreeC for 2 hours. Furthermore, it was dried under reduced pressure at 40 ° C. for 6 hours using an evaporator to sufficiently remove dehydrated THF to obtain a urethane acrylate oligomer.
Thereafter, 63.0 parts by mass of FA-324A (polyoxyethylene-modified bisphenol A diacrylate, active ingredient 100% by mass, manufactured by Hitachi Chemical Co., Ltd.) in a reaction vessel equipped with another thermometer, a stirring bar, and a reflux condenser. ABE-300 (ethoxylated bisphenol A diacrylate, active ingredient 100% by mass, Shin-Nakamura Chemical Co., Ltd.) 66.0 parts by mass, urethane acrylate oligomer 12.0 parts by mass obtained above, and benzophenone 9 Then, the mixture was stirred and mixed for 5 hours at 25 ° C. while sufficiently shielding light inside the reaction vessel and replacing with nitrogen to obtain a prism layer resin.

Using the obtained test piece with a prism layer, the adhesiveness was evaluated as follows. The results are shown in Table 1.
-Adhesiveness-
Based on JIS-K-5600-5-6 (1999), the crosscut test was done by the following method.
On the surface of the prism layer of the test piece with the prism layer produced as described above, 11 cuts having a depth reaching the substrate at intervals of 1 mm each in the vertical and horizontal directions were made and cross-cut. The total number of crosscuts is 100. An 18 mm wide cellophane tape (manufactured by Nichiban Co., Ltd., Cellotape (registered trademark) CT405AP) was attached on the cross-cut surface, and then peeled off in the 90 ° direction, and the number of remaining prism layers was measured.
The measurement was carried out three times, and the average value of the three measurements was evaluated according to the following evaluation criteria.
<Evaluation criteria>
A: The number of remaining prism layers is 96 to 100, and the adhesiveness is very excellent.
B: The number of remaining prism layers is 90 to 95, and the adhesiveness is more excellent.
C: The number of remaining prism layers is 80 to 89, and the adhesiveness is excellent.
D: The number of remaining prism layers is 40 to 79, the adhesiveness is inferior, and practically hindered.
E: The number of remaining prism layers is 0 to 39, the adhesiveness is very poor, and there is a practical problem.

(Examples 2 to 13, Examples 15 to 21 and Examples 25 to 29, and Comparative Examples 1 to 8 and 10)
In Examples 2 to 13, Examples 15 to 21 and Examples 25 to 29, and Comparative Examples 1 to 8 and 10, Example 1 was changed except that the composition of Example 1 was changed to the composition shown in Table 1. In the same manner, a coating liquid of the resin composition as shown in Table 1 was prepared. A test piece was prepared in the same manner as in Example 1 using the prepared coating liquid of the resin composition. The obtained test piece was evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Example 14 and Examples 22-24)
In Example 14 and Examples 22 to 24, a (meth) acrylic resin aqueous dispersion was prepared in the same manner as in Example 1 except that the composition of Example 1 was changed to the composition shown in Table 1. The obtained (meth) acrylic resin aqueous dispersion, a crosslinking agent, and ammonium sulfate were mixed at a blending ratio shown in Table 1 to obtain a resin composition coating solution. A test piece was prepared in the same manner as in Example 1 using the prepared coating liquid of the resin composition. The obtained test piece was evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 9)
In Comparative Example 9, the (meth) acrylic resin aqueous dispersion obtained in Production Example 27, the polyester resin aqueous dispersion (A-640), and the crosslinking agent were mixed at the blending ratio shown in Table 1, A coating liquid for the resin composition was prepared. A test piece was prepared in the same manner as in Example 1 using the prepared coating liquid of the resin composition. The obtained test piece was evaluated in the same manner as in Example 1. The results are shown in Table 1.

Abbreviations in Table 1 are as follows. In addition, the mass part number of Table 1 is a conversion value of solid content or an active ingredient. “-” In Table 1 indicates that the corresponding component is not included.
The blend resin means a resin component added after seed polymerization.
The measurement result means the number of cured films remaining in the adhesion test.

MMA: methyl methacrylate BA: n-butyl acrylate MAA: methacrylic acid NMAM: N-methylol acrylamide A-640: polyester resin aqueous dispersion (solid content: 25% by mass, weight average molecular weight Mw: 15000, Takamatsu Oil and fat Co., Ltd., pesresin A-640 (product name))
SF-150: polyurethane resin aqueous dispersion (solid content: 25% by mass, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., Superflex 150 (product name))
Acrylic 1: (meth) acrylic resin aqueous dispersion (solid content: 23.5% by mass)
APS: persulfate polymerization initiator (chemical name: ammonium persulfate)
PBPV: organic peroxide polymerization initiator (chemical name: t-butyl peroxypivalate, active ingredient: 70% by mass, manufactured by NOF Corporation, perbutyl PV (product name))
V-501: water-soluble azo polymerization initiator (chemical name: 4,4′-azobis (4-cyanovaleric acid), manufactured by Wako Pure Chemical Industries, Ltd.)
NDM: chain transfer agent (chemical name: n-dodecyl mercaptan, manufactured by Kao Corporation, thiocalcol 20 (product name))
ME: chain transfer agent (chemical name: 2-mercaptoethanol,
G-65: non-reactive emulsifier (component: sodium dodecylbenzenesulfonate, active ingredient: 65 mass%, manufactured by Kao Corporation, Neoperex G-65 (product name), anion having no ethylenically unsaturated bond Non-reactive surfactant)
ER-30: reactive emulsifier (active ingredient: 65% by mass, manufactured by ADEKA Corporation, Adeka Soap ER-30 (product name), nonionic surfactant having an ethylenically unsaturated bond)
MW-12LF: Melamine-based crosslinking agent (component: methylolated melamine resin, active ingredient: 70% by mass, manufactured by Sanwa Chemical Co., Ltd., Nicalak MW-12LF (product name))
WB-3936: Blocked isocyanate-based crosslinking agent (active ingredient: 30% by mass, Takenate WB-3936 (product name) manufactured by Mitsui Chemicals, Inc.)

(Meth) acrylic resin having 0.1 to 50% by mass of a structural unit derived from a monomer having a crosslinkable functional group based on the total structural unit, a water-soluble resin and a water-dispersible resin, A resin other than the (meth) acrylic resin and a cross-linking agent that is 0.3 to 50 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin, and the (meth) acrylic resin is water-based A medium, a resin other than the (meth) acrylic resin selected from the water-soluble resin and the water-dispersible resin, a monomer constituting the (meth) acrylic resin, and the (meth) acrylic resin A monomer constituting the (meth) acrylic resin is polymerized in a precursor mixture containing 0.05 to 5.0 parts by mass of a chain transfer agent with respect to 100 parts by mass in total of the monomers. Trees of Examples 1 to 29 obtained as above Film comprising a primer layer formed from the composition was excellent in adhesion to a prism layer.
Especially the film containing the primer layer formed from the resin composition of Examples 3-8, 10-12, 14, 16, 18, and 20 was very excellent in the adhesiveness with respect to a prism layer.

On the other hand, the comparative example 1 whose content of a chain transfer agent is outside the range of 0.05 mass part-5.0 mass parts with respect to 100 mass parts in total of the monomer which comprises a (meth) acrylic resin. And 2, comparative example 3 whose content rate of the structural unit derived from the monomer which has a crosslinkable functional group in a (meth) acrylic resin is outside the range of 0.1 mass%-50 mass% with respect to all the structural units. And 4, the primer layer formed from the resin composition of Comparative Examples 5-8 whose content of a crosslinking agent is outside the range of 0.3-50 parts by mass with respect to 100 parts by mass of (meth) acrylic resin The film containing was poor in adhesion to the prism layer.
After separately producing a (meth) acrylic resin and a polyester resin, the resin composition of Comparative Example 9 including a blend resin in which each was mixed, and Comparative Example 10 using a crosslinkable (meth) acrylic resin as a seed resin The formed film including the primer layer was inferior in adhesion to the prism layer.

  As mentioned above, the film which has the primer layer formed from the resin composition of this invention was excellent in the adhesiveness with respect to an optical functional layer.

Claims (10)

From a (meth) acrylic resin containing 0.1% to 50.0% by mass of a structural unit derived from a monomer having a crosslinkable functional group based on the total structural unit, a water-soluble resin, and a water-dispersible resin A resin other than the (meth) acrylic resin selected, and a crosslinking agent that is 0.3 to 50.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin,
The (meth) acrylic resin is
An aqueous medium;
A resin other than the (meth) acrylic resin selected from the water-soluble resin and the water-dispersible resin;
A monomer constituting the (meth) acrylic resin;
A chain transfer agent that is 0.05 to 5.0 parts by mass with respect to a total of 100 parts by mass of the monomers constituting the (meth) acrylic resin, in the precursor mixture containing the (meth) acrylic A resin composition obtained by polymerizing monomers constituting a resin. The precursor mixture further includes a polymerization initiator,
2. The resin according to claim 1, wherein the content of the polymerization initiator is 0.1 part by mass to 5.0 parts by mass with respect to 100 parts by mass in total of the monomers constituting the (meth) acrylic resin. Composition.   The resin composition according to claim 2, wherein the polymerization initiator is at least one peroxide having a sulfonyl group.   The resin composition according to any one of claims 1 to 3, wherein the (meth) acrylic resin has a weight average molecular weight of 100,000 to 1,900,000.   The precursor mixture further includes a reactive emulsifier, and the content of the reactive emulsifier is 3.0 parts by mass to 30.0 parts with respect to a total of 100 parts by mass of the monomers constituting the (meth) acrylic resin. The resin composition of any one of Claims 1-4 which is a mass part.   6. The resin according to claim 1, wherein the resin other than the (meth) acrylic resin selected from the water-soluble resin and the water-dispersible resin is at least one selected from a polyester resin and a polyurethane resin. The resin composition as described.   The resin composition according to any one of claims 1 to 6, comprising a melamine-based crosslinking agent as the crosslinking agent.   Furthermore, sulfate ion is included, The content of the said sulfate ion is 0.1 mass part-1.5 mass parts with respect to 100 mass parts of said (meth) acrylic resins, The any one of Claims 1-7. 2. The resin composition according to item 1. A substrate;
The primer layer which is a crosslinked material of the resin composition of any one of Claims 1-8. An aqueous medium, a resin other than a (meth) acrylic resin selected from a water-soluble resin and a water-dispersible resin, a monomer constituting the (meth) acrylic resin, and a single amount constituting the (meth) acrylic resin The monomer constituting the (meth) acrylic resin is polymerized in a precursor mixture containing 0.05 to 5.0 parts by mass of a chain transfer agent with respect to 100 parts by mass of the total body Obtaining a dispersion of the (meth) acrylic resin;
Mixing the dispersion of the (meth) acrylic resin with a crosslinking agent that is 0.3 to 50.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin,
The said (meth) acrylic resin is a manufacturing method of the resin composition which contains 0.1 mass%-50.0 mass% of the structural unit derived from the monomer which has a crosslinkable functional group with respect to all the structural units.