TWI873091B - Functional components - Google Patents

Abstract

The purpose of the present invention is to improve the adhesion between the substrate and the easy-adhesion layer and the adhesion between the easy-adhesion layer and the functional layer, and to maintain sufficient adhesion even when exposed to harsh environments such as high temperature and high humidity for a long time. In order to achieve this purpose, the functional component of the present invention is a functional component in which the easy-adhesion layer and the functional layer are sequentially laminated on at least one side of the substrate, and the solid component acid value (acid value) of the composition used to form the aforementioned easy-adhesion layer is 10.0 mgKOH/g or more, and the solid component acid value of the composition used to form the aforementioned functional layer is 4.0~12.0 mgKOH/g.

Description

Functional components

The present invention relates to a functional component, film, sheet, etc., which is sequentially laminated with a substrate, an easy-adhesion layer, and a functional layer. More specifically, the present invention relates to a functional component, film, sheet, etc., which can maintain sufficient adhesion even in a harsh environment such as high temperature and high humidity.

Plastic materials are widely used as materials for electronic devices due to their lightness, processability, and productivity. Plastic materials are sometimes used alone, but in most cases, a functional layer with specific functions is deposited on the surface, and functions are added according to the intended use. In recent years, in particular, plastic materials have been used in fields that have not been used before, replacing glass or metal materials. As a result, plastic materials are also required to have high interlayer adhesion stability in harsh environments such as high temperature and high humidity. [Prior Art Literature] [Patent Literature]

[Patent document 1] Japanese Patent Publication No. 09-176518 [Patent document 2] International Publication No. 2015/170560

[The problem that the invention wants to solve]

However, thermoplastic resins such as polyester, polyamide, polystyrene, polyolefin, polycarbonate, and polyimide, which are the raw materials of plastic materials, are usually melted to form fibers, films, sheets, etc., but their surfaces are often crystallized and lack adhesion to inks, adhesives, etc. Among them, in the case of thin films, they are highly crystallized and oriented through the steps of stretching and thermal fixing, so the level of adhesion is very low and it is known that the adhesion is generally poor.

This problem can be solved by using a material with high affinity to the plastic film for the functional layer, but the material of the functional layer is extremely limited and the necessary function is sometimes damaged. Therefore, as in Patent Document 1 or Patent Document 2, a method is adopted to improve the adhesion between the substrate and the easy adhesion layer and the adhesion between the easy adhesion layer and the functional layer by setting an easy adhesion layer with high affinity to both layers between the substrate and the functional layer. However, although the functional plastic film provided with the easy-adhesion layer has good initial adhesion, when the film is exposed to a harsh environment such as high temperature and high humidity for a long time, the adhesion between the substrate and the easy-adhesion layer and/or the adhesion between the easy-adhesion layer and the functional layer decreases, resulting in undesirable conditions such as the easy-adhesion layer and/or the functional layer peeling off.

As mentioned above, in recent years, plastic materials have also been used in fields that have not been used so far, such as transparent conductive substrates for touch panels, flexible circuit substrates, flexible display substrates, organic EL substrates, LED lighting substrates, and other electronic device materials. These materials require higher initial adhesion than ever before and longer-term adhesion stability in harsh environments such as high temperature and high humidity.

The purpose of the present invention is to improve the adhesion between the substrate and the easy-adhesion layer and the adhesion between the easy-adhesion layer and the functional layer, and to maintain sufficient adhesion even when exposed to harsh environments such as high temperature and high humidity for a long time. [Means for solving the problem]

A functional component of the present invention is characterized in that an easy-adhesion layer and a functional layer are sequentially laminated on at least one surface of a substrate, wherein the solid acid value of the composition used to form the easy-adhesion layer is greater than 10.0 mgKOH/g, and the solid acid value of the composition used to form the functional layer is 4.0-12.0 mgKOH/g.

Furthermore, the functional component of the present invention is characterized in that the composition used to form the aforementioned easy-to-adhesive layer preferably contains polyester-acrylic composite resin as a main component.

Furthermore, the functional component of the present invention is preferably a polyester-acrylic composite resin in which the acrylic resin component accounts for a larger proportion than the polyester resin component on a weight basis.

Furthermore, in the functional component of the present invention, it is preferred that the surface of the substrate on which the easy-adhesion layer is laminated is one into which polar groups are introduced by surface treatment.

Furthermore, the functional component of the present invention is characterized in that the aforementioned polar group is preferably selected from any one or more of a hydroxyl group, a carboxyl group or a sulfonic acid group. [Effect of the invention]

According to the present invention, the adhesion between the substrate and the easy-adhesion layer of the functional component and the adhesion between the easy-adhesion layer and the functional layer can be improved. In particular, even in a harsh environment such as high temperature and high humidity, the adhesion of the functional component changes little and can maintain good adhesion.

The following describes the implementation of the functional component of the present invention with reference to FIG. 1 and FIG. 2 .

The functional component of the present invention has a basic structure as shown in Fig. 1, which comprises a substrate 10, an easy-adhesion layer 20 and a functional layer 30. The functional component is not only as shown in Fig. 1, but may also be provided with a back coating 40 (Fig. 2) on the side opposite to the side on which the functional layer 30 is laminated.

First, the substrate 10 is described. A plastic film is suitable for the substrate 10. Plastic films can be, for example, polyethylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetylcellulose, polymethyl methacrylate, polyvinyl chloride, polynorbornene, polyimide compounds, etc. The substrate can be selected according to the purpose, such as transparency, heat resistance, mechanical strength, dimensional stability, color tone, etc. Among them, stretched, especially biaxially stretched polyethylene terephthalate film has excellent mechanical strength and dimensional stability, so it is suitable for use.

The thickness of the substrate 10 is not particularly limited and can be appropriately selected according to the material used. When considering operability, it is generally not less than 1 μm and not more than 300 μm, and preferably not less than 23 μm and not more than 188 μm.

The substrate 10 may be subjected to surface treatment such as plasma treatment, corona discharge treatment, or far ultraviolet irradiation treatment. By applying such surface treatment, the wettability of the easy-adhesion layer 20 to the substrate 10 is improved, and the adhesion can be improved. In particular, when the polar group introduced by plasma treatment or corona discharge treatment is a specific functional group, a hydrogen bond is formed with a composition having a specific solid component acid value for forming the easy-adhesion layer 20 described later, and the adhesion is further improved.

Here, the polar groups introduced by the aforementioned surface treatment include, for example, carboxyl, epoxy, hydroxyl, carbonyl, hydroperoxy, sulfonic acid, etc., preferably, at least one selected from hydroxyl, carboxyl or sulfonic acid.

Next, the easy bonding layer 20 will be described. The easy bonding layer 20 is not particularly limited as long as it is formed of a composition having a specific solid component acid value, and compounds such as ionizing radiation curable resins, thermosetting resins, and thermoplastic resins can be used alone or in combination of two or more, depending on the purpose.

Although the mechanism of adhesion is not clear, the composition used to form the easy-adhesion layer 20 has a specific solid component acid value, and the composition used to form the functional layer 30 described later has a specific solid component acid value, and a hydrogen bond is formed between the easy-adhesion layer 20 and the functional layer 30, thereby improving adhesion. In addition, the adhesion with the substrate 10 varies depending on the material of the substrate 10, but when the adhesion is insufficient, the adhesion can be improved by applying the above-mentioned surface treatment to the substrate 10. In addition, when the polar group introduced into the substrate 10 by the above-mentioned surface treatment is a specific functional group as described above, a hydrogen bond is also formed between the substrate 10 and the easy-adhesion layer 20, further improving adhesion.

The acid value of the composition for forming the easy-adhesion layer 20 can be adjusted by introducing functional groups such as carboxyl groups, sulfonic acid groups, phosphoric acid groups, phenolic hydroxyl groups, etc. into the compounds constituting the composition.

The solid component acid value of the composition used to form the easy-adhesion layer 20 is preferably 10.0 mgKOH/g or more, more preferably 10.5 mgKOH/g or more, and most preferably 11.0 mgKOH/g or more in order to improve the adhesion between the substrate 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30. When the solid component acid value is less than 10.0 mgKOH/g, it becomes impossible to form a sufficient amount of hydrogen bonds for exhibiting the aforementioned adhesion, and the adhesion between the substrate 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30 is reduced. The solid acid value in the present invention is a value calculated from the acid value obtained by the indicator titration method specified in JIS K 2501:2003 and the solid concentration.

The aforementioned composition preferably has a polyester-acrylic composite resin as the main component. By using the polyester-acrylic composite resin as the main component, the adhesion between the substrate 10 and the easy-bonding layer 20 and the adhesion between the easy-bonding layer 20 and the functional layer 30 can be improved. The main component of the present invention refers to the component that exceeds 50 parts by weight when the total solid content of the components constituting the composition is 100 parts by weight.

The polyester-acrylic composite resin may be a mixture of a polyester resin and an acrylic resin, or a compound containing at least both a polyester component and an acrylic component as components, or a composite of these. Examples of the compound containing both a polyester component and an acrylic component as components include polyester-acrylic copolymers. In consideration of the storage stability of the composition, the transparency or smoothness of the film, a compound containing both a polyester component and an acrylic component as components is preferred.

In addition, the ratio of polyester to acrylic in the polyester-acrylic composite resin is not necessarily limited. On a weight basis, it is preferred that the acrylic component accounts for a larger proportion than the polyester resin component. For example, the content of the main acrylic resin component is preferably 51-99% by weight, and more preferably 60-97% by weight. Within this range, the adhesion between the substrate 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30 is further improved.

In addition, the easy-to-bond layer 20 may contain additives such as antistatic agents, antioxidants, leveling agents, anti-adhesive agents, lubricants, flame retardants, ultraviolet absorbers, dispersants, coagulants, pigments, dyes, lubricants, etc., within the range that does not hinder the function of the present invention.

The thickness of the easy-adhesion layer 20 is 0.01 μm to 50 μm, preferably 0.1 μm to 5 μm, and more preferably 0.5 μm to 2 μm. With such a thickness, the adhesion between the substrate 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30 can be improved, and sufficient adhesion can be maintained even in a harsh environment such as high temperature and high humidity for a long time. The thickness of the easy-adhesion layer 20 can be measured, for example, by a reflection spectrophotometer (FE-300UV: Otsuka Electronics Co., Ltd.).

Next, the functional layer 30 will be described. The composition for forming the functional layer 30 is not particularly limited as long as it has a specific solid acid value, and compounds such as ionizing radiation curable resins, thermosetting resins, and thermoplastic resins can be used alone or in combination of two or more, depending on the purpose.

This ionizing radiation curing resin can be used by irradiating ionizing radiation (ultraviolet rays or electron beams) to an ionizing radiation curing coating mixed with one or more photopolymerizable prepolymers or photopolymerizable monomers to cure. Here, the photopolymerizable prepolymer, for example, an acrylic prepolymer having one or more (meth)acrylic groups in one molecule is particularly suitable for use. Examples of the acrylic prepolymer include urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyperfluoroalkyl acrylate, polysilicone acrylate, and the like.

In addition, photopolymerizable monomers, such as acrylic monomers having one or more (meth)acryloyl groups in one molecule, are particularly suitable for use. Examples include monofunctional acrylic monomers such as 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 2-butoxyethyl acrylate; bifunctional acrylic monomers such as 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, and hydroxy neopentyl glycol diacrylate; and multifunctional (trifunctional or higher) acrylic monomers such as dipentaerythritol hexaacrylate, trihydroxymethylpropane triacrylate, and pentaerythritol triacrylate. These photopolymerizable monomers may be used alone or in combination of two or more. The mixing ratio of the photopolymerizable prepolymer and the photopolymerizable monomer is not particularly limited and can be appropriately set according to the purpose and application.

Examples of the thermosetting resin include polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, epoxy resins, melamine resins, phenol resins, and silicone resins.

Examples of the thermoplastic resin include polyester resins, acrylic resins, polycarbonate resins, cellulose resins, acetal resins, vinyl resins, polyethylene resins, polystyrene resins, polypropylene resins, polyamide resins, polyimide resins, and fluorine resins.

In order to improve the adhesion between the easy-adhesion layer 20 and the functional layer 30, the acid value of the solid component of the composition used to form the functional layer 30 is preferably 4.0 mgKOH/g or more, more preferably 4.5 mgKOH/g or more, and most preferably 5.0 mgKOH/g or more, preferably 12.0 mgKOH/g or less, more preferably 11.0 mgKOH/g or less, and most preferably 9.0 mgKOH/g or less. When the solid component acid value is less than 4.0 mgKOH/g, the adhesion between the easy-adhesion layer 20 and the functional layer 30 may be reduced because a sufficient amount of hydrogen bonds for exhibiting adhesion are not formed between the easy-adhesion layer 20 and the functional layer 30. When it is greater than 12.0 mgKOH/g, a side reaction such as hydrolysis of the ester may occur, and the amount of hydrogen bonds formed between the easy-adhesion layer 20 and the functional layer 30 may be reduced, and the adhesion between the easy-adhesion layer 20 and the functional layer 30 may be reduced. The solid component acid value can be obtained in the same manner as the solid component acid value of the composition for forming the easy-adhesion layer 20.

The acid value of the composition for forming the functional layer 30 can be adjusted by introducing functional groups such as carboxyl groups, sulfonic acid groups, phosphoric acid groups, phenolic hydroxyl groups, etc. into the components constituting the composition.

The functional layer 30 may further include a photoinitiator, a hardener, etc. according to the hardening method. The photoinitiator may include photo-radical polymerization initiators such as acetophenone, benzophenone, Michler's ketone, benzoin, benzyl methyl acetal, benzoyl benzoate, α-acyl oxime ester, thioxanthone, etc., or photo-cationic polymerization initiators such as onium salts, sulfonates, and organometallic complexes. In addition, the hardener may be used in combination with a resin of a compound such as polyisocyanate, amino resin, epoxy resin, carboxylic acid, etc.

In addition, the functional layer 30 may contain additives such as antistatic agents, antioxidants, leveling agents, anti-adhesive agents, lubricants, flame retardants, ultraviolet absorbers, dispersants, coagulants, pigments, dyes, lubricants, etc. as long as the functions of the present invention are not hindered.

The thickness of the functional layer 30 is 0.01 μm to 100 μm, preferably 1 μm to 10 μm, and more preferably 2 μm to 5 μm. With such a thickness, the adhesion between the functional layer 30 and the easy-adhesion layer 20 is improved, and sufficient adhesion can be maintained even in a long-term exposure to a harsh environment such as high temperature and high humidity. The thickness of the functional layer 30 is measured, for example, by a reflection spectrophotometer (FE-300UV: Otsuka Electronics Co., Ltd.).

The function of the functional layer 30 is not particularly limited, and can be appropriately selected according to the purpose of, for example, an anti-glare layer, a hard coating, an anti-reflection layer, an anti-fouling layer, an antibacterial layer, a barrier layer, a light-shielding layer, an index matching layer, an antistatic layer, etc. For example, in the case of a hard coating, since the shrinkage of the film is large, if a function such as not damaging the adhesion is selected, the adhesion can be effectively improved by satisfying the conditions of the easy-adhesion layer 20 and the functional layer 30 of the present invention.

Next, the back coating 40 is described. The functional component of the present invention is laminated on at least one side of the substrate in the order of the easy-adhesion layer 20 and the functional layer 30, but the back coating 40 can also be provided when necessary. The back coating 40 is not particularly limited, and a layer with necessary functions can be used appropriately according to the purpose. The easy-adhesion layer 20 and the functional layer 30 can also be provided as the back coating 40, and a surface treatment can also be applied between the substrate 10 and the back coating 40.

Next, an example of a method for producing the functional component of the present invention is described. The method for producing the functional component of the present invention is not particularly limited. For example, on any substrate 10, a coating liquid for an easy-adhesion layer in which the material of the easy-adhesion layer 20 is dissolved or dispersed in an appropriate solvent is applied on the substrate 10 by a known method, and then dried and irradiated with ionizing radiation such as ultraviolet rays when necessary. Then, a coating liquid for a functional layer in which the material of the functional layer 30 is dissolved or dispersed in an appropriate solvent is applied on the easy-adhesion layer 20 by a known method, and then dried and irradiated with ionizing radiation such as ultraviolet rays when necessary.

When the back coating 40 is provided, a back coating liquid dissolved or dispersed in an appropriate solvent is applied to the surface of the substrate 10 having the functional layer 30 opposite to the functional layer 30 by a known method, dried, and irradiated with ionizing radiation such as ultraviolet rays if necessary.

The coating method (film forming method) of the aforementioned easy-to-bond layer 20, the functional layer 30 and the back coating layer 40 is not particularly limited. For example, a known coating method such as a spin coating method, an extrusion die coating method, a doctor blade coating method, a rod coating method, a screen printing method, a stencil printing method, a roller coating method, a spray coating method, an immersion coating method, an inkjet method, etc. can be used.

At this time, from the perspective of productivity, the coating order of the easy-to-bond layer 20, the functional layer 30, and the back coating layer 40 can be appropriately selected. In addition, if necessary, a functional layer can be further laminated on the functional layer 30 or the back coating layer 40.

Next, the characteristics of the functional component of the present invention are described. The characteristics of the functional component are initial adhesion and adhesion after long-term exposure to harsh environments such as high temperature and high humidity.

Adhesion is tested in accordance with the grid peeling test specified in JIS K 5400. The test is conducted in two conditions: after the functional components are manufactured, without any treatment (hereinafter referred to as the "initial adhesion test") and after being exposed to an environment of temperature 85°C and humidity 85% (humidification is carried out with pure water) for a certain period of time (hereinafter referred to as the "adhesion test after high temperature and high humidity exposure"). The test piece is considered acceptable if no more than a quarter of the grids out of 100 grids are peeled off in more than 80 of them.

According to the functional component of the present invention, the adhesion between the substrate 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30 can be improved. In particular, the adhesion is well maintained with little change over time due to long-term exposure to harsh environments such as high temperature and high humidity. [Example]

The following are examples and comparative examples of the functional component of the present invention. In the following examples and comparative examples, "%" and "parts" are all based on weight unless otherwise stated.

[Example 1] One side of a 100μm thick polyethylene terephthalate film (lumirror T60: Toray Co., Ltd.) was subjected to a corona discharge treatment, and the coating liquid A for an easy-adhesion layer according to the prescription shown in Table 1 was applied to the surface treated surface, and dried to form an easy-adhesion layer with a thickness of 1.5μm. Next, the coating liquid A for a functional layer according to the prescription shown in Table 2 was applied to the easy-adhesion layer, and after drying, it was irradiated with ultraviolet rays to harden, forming a functional layer with a thickness of 3μm, and the functional component of Example 1 was manufactured.

<Preparation of Polyester Resin A Aqueous Dispersion> 83 parts of terephthalic acid, 83 parts of isophthalic acid, 93 parts of ethylene glycol, 32 parts of diethylene glycol and 0.1 parts of zinc acetate as a catalyst were placed in a flask equipped with a nitrogen inlet tube, a thermometer, a stirrer and a distiller, and heated at 190-220°C for 13 hours to carry out an esterification reaction to obtain polyester glycol. 100 parts of the obtained polyester glycol, 100 parts of xylene and 35 parts of pyromellitic anhydride were placed in a flask equipped with the same apparatus as above, reacted at 140°C for 1 hour, and then xylene was distilled off. The temperature of the system took 2 hours, and the temperature was raised to 180°C, and then kept warm for another hour. As a result, polyester resin A with a molecular weight of 18,000 was obtained. The obtained polyester resin A (25 parts) was added to a mixed solution of 15 parts of isopropyl alcohol and 60 parts of ion exchange water, and stirred at 70-80°C for 3 hours to obtain a polyester resin A aqueous dispersion having a solid content concentration of 25%. The solid content acid value of the polyester resin A aqueous dispersion was 130 mgKOH/g.

<Production of Polyester Resin B Aqueous Dispersion> 83 parts of terephthalic acid, 36 parts of isophthalic acid, 32 parts of ethylene glycol and 46 parts of neopentyl glycol were placed in a flask equipped with a nitrogen inlet tube, a thermometer, a stirrer and a distiller, and heated at 260°C for 4 hours to carry out an esterification reaction. Next, 0.1 parts of antimony trioxide was added as a catalyst, the temperature of the system was raised to 280°C, and the pressure of the system was gradually reduced to 0.1 mmHg after 1.5 hours. Under this condition, a polymerization reaction was carried out for another 4 hours, and a polyester resin B with a molecular weight of 18400 was obtained. The obtained polyester resin B (25 parts) was added to a mixed solution of 15 parts of isopropyl alcohol and 60 parts of ion exchange water, and stirred at 70-80°C for 3 hours to obtain a polyester resin B aqueous dispersion having a solid content concentration of 25%. The solid content acid value of the polyester resin B aqueous dispersion was 1.0 mgKOH/g.

<Preparation of acrylic resin aqueous dispersion> In a beaker, 18 parts of ion exchange water and 3 parts of ELEMINOL RS-3000 (Sanyo Chemical Industries, Ltd., anionic surfactant, solid content concentration 50%) were added, and 71 parts of methyl methacrylate and 29 parts of butyl acrylate were added while stirring to prepare a monomer emulsion. Next, 37.5 parts of ion exchange water, 1 part of ELEMINOL RS-3000 and 0.5 parts of potassium persulfate were added to a beaker equipped with a condenser, a monomer dropping funnel, a thermometer and a stirrer, and nitrogen substitution was performed while stirring, and then heating was started, and the above-mentioned monomer emulsion was dropped at 75°C for 4 hours. After the dripping is completed, the liquid temperature is stirred at 75-85°C for 4 hours and then cooled. As a result, an acrylic resin with a molecular weight of 400,000 is obtained. Ion exchange water is then added to obtain an acrylic resin aqueous dispersion with a solid content concentration of 25%. The solid content acid value of the acrylic resin aqueous dispersion is 0.5 mgKOH/g.

[Example 2] Except that the corona discharge treatment of Example 1 is not applied, the functional components of Example 2 are manufactured in the same manner as Example 1.

[Example 3] Except that the functional layer coating liquid A of Example 1 is replaced with the functional layer coating liquid B listed in Table 2, the functional component of Example 3 is prepared in the same manner as Example 1.

[Example 4] Except that the functional layer coating liquid A of Example 1 is replaced with the functional layer coating liquid C listed in Table 2, the functional component of Example 4 is prepared in the same manner as Example 1.

[Example 5] Except that the coating liquid A for the easy-bonding layer of Example 1 is replaced by the coating liquid B for the easy-bonding layer listed in Table 1, and the coating liquid A for the functional layer is replaced by the coating liquid D for the functional layer listed in Table 2, the functional component of Example 5 is prepared in the same manner as Example 1.

[Example 6] Except that the coating liquid A for the easy-bonding layer of Example 1 is replaced by the coating liquid C for the easy-bonding layer listed in Table 1, and the coating liquid A for the functional layer is replaced by the coating liquid D for the functional layer listed in Table 2, the functional component of Example 6 is prepared in the same manner as Example 1.

[Example 7] Except that the coating liquid A for the easy-bonding layer of Example 1 is replaced by the coating liquid D for the easy-bonding layer listed in Table 1, and the coating liquid A for the functional layer is replaced by the coating liquid D for the functional layer listed in Table 2, the functional component of Example 7 is prepared in the same manner as Example 1.

[Example 8] Except that the coating liquid A for the easy-bonding layer of Example 1 is replaced by the coating liquid E for the easy-bonding layer listed in Table 1, and the coating liquid A for the functional layer is replaced by the coating liquid D for the functional layer listed in Table 2, the functional component of Example 8 is prepared in the same manner as Example 1.

[Example 9] Except that the coating liquid A for the easy-bonding layer of Example 1 is changed to the coating liquid F for the easy-bonding layer listed in Table 1, and the coating liquid A for the functional layer is changed to the coating liquid D for the functional layer listed in Table 2, the functional component of Example 9 is prepared in the same manner as Example 1.

[Example 10] Except that the coating liquid A for the easy-bonding layer of Example 1 is replaced by the coating liquid G for the easy-bonding layer listed in Table 1, and the coating liquid A for the functional layer is replaced by the coating liquid D for the functional layer listed in Table 2, the functional component of Example 10 is prepared in the same manner as Example 1.

[Example 11] Except that the coating liquid A for the easy bonding layer of Example 1 is changed to the coating liquid H for the easy bonding layer listed in Table 1, and the coating liquid A for the functional layer is changed to the coating liquid D for the functional layer listed in Table 2, the functional component of Example 11 is prepared in the same manner as Example 1.

[Comparative Example 1] The functional component of Comparative Example 1 was prepared in the same manner as in Example 1 except that the functional layer coating liquid A of Example 1 was replaced with the functional layer coating liquid E listed in Table 2.

[Comparative Example 2] The functional component of Comparative Example 2 was prepared in the same manner as in Example 1 except that the coating liquid A for the easy-bonding layer of Example 1 was replaced with the coating liquid I for the easy-bonding layer listed in Table 1.

[Comparative Example 3] The functional component of Comparative Example 3 was prepared in the same manner as in Example 1 except that the functional layer coating liquid A of Example 1 was replaced with the functional layer coating liquid F listed in Table 2.

[Comparative Example 4] The functional component of Comparative Example 4 was prepared in the same manner as in Example 1 except that the functional layer coating liquid A of Example 1 was replaced with the functional layer coating liquid G listed in Table 2.

[Comparative Example 5] The functional component of Comparative Example 5 was prepared in the same manner as in Example 1 except that the coating liquid A for the easy-bonding layer of Example 1 was replaced with the coating liquid J for the easy-bonding layer listed in Table 1.

The following properties were evaluated for the easy-adhesion layer coating liquid, the functional layer coating liquid, and the functional member produced in the above-mentioned Examples and Comparative Examples.

<Calculation of solid acid value> For the coating liquid for the easy bonding layer and the coating liquid for the functional layer described in Examples 1 to 11 and Comparative Examples 1 to 5, the acid value obtained by the indicator titration method specified in JIS K 2501:2003 and the value calculated from the solid content concentration of each coating liquid were used as the solid acid value. The calculation results are shown in Table 3.

<Adhesion test> 1. Initial adhesion test The functional layers of the functional components manufactured in the above-mentioned embodiments and comparative examples were tested according to the chessboard peeling test specified in JIS K 5400 and evaluated according to the criteria shown below. Among the 100 squares of the chessboard, if no more than one quarter of all the squares are peeled off, the evaluation is "◎", if no more than one quarter of the squares are peeled off among more than 80 squares among the 100 squares, the evaluation is "0", and if no more than one quarter of the squares are peeled off among less than 80 squares among the 100 squares, the evaluation is "×". The measurement results are shown in Table 3.

2. Adhesion test after high temperature and high humidity exposure The functional components made in the above-mentioned embodiments and comparative examples were exposed to an environment of temperature 85°C and humidity 85% (humidification was carried out with pure water) for 500 hours. Then, the functional layer was tested according to the chessboard peeling test specified in JIS K 5400 and evaluated according to the criteria shown below. The evaluation is "◎" when no more than one quarter of the squares in all the 100 squares of the chessboard peel off, "0" when no more than one quarter of the squares in more than 80 squares out of the 100 squares peel off, and "×" when no more than one quarter of the squares in less than 80 squares out of the 100 squares peel off. The measurement results are shown in Table 3.

From the results in Table 3, it can be seen that the functional components of Examples 1 to 11 are because the solid acid value of the composition used to form the easy-adhesion layer on the substrate is 10.0 mgKOH/g or more, and the solid acid value of the composition used to form the functional layer is 4.0 to 12.0 mgKOH/g. Therefore, the initial adhesion test and the adhesion test after high temperature and high humidity exposure are both evaluated well, and the adhesion between the substrate and the easy-adhesion layer and the adhesion between the easy-adhesion layer and the functional layer are excellent.

Comparative Examples 2 and 5 are because the acid value of the solid component of the composition used to form the easy-bonding layer is less than 10.0 mgKOH/g, and Comparative Examples 1, 3, and 4 are because the acid value of the solid component of the composition used to form the functional layer is less than 4.0 mgKOH/g, or exceeds 12.0 mgKOH/g. Therefore, the initial adhesion and/or the adhesion after exposure to high temperature and high humidity between the substrate and the easy-bonding layer and/or the easy-bonding layer and the functional layer are poor.

10‧‧‧Base material 20‧‧‧Easy-adhesion layer 30‧‧‧Functional layer 40‧‧‧Back coating

[Figure 1] Basic form of the functional component of the present invention [Figure 2] Form of the functional component of the present invention, in which a back coating is applied on the opposite side of the substrate on which the functional layer is formed

10‧‧‧Base material

20‧‧‧Easy to bond layer

30‧‧‧Functional layer

Claims (4)

A functional component characterized in that an easy-adhesion layer and a functional layer are sequentially laminated on at least one side of a substrate, wherein the solid acid value of the composition used to form the easy-adhesion layer is 10.0 mgKOH/g or more, and the solid acid value of the composition used to form the functional layer is 4.0-12.0 mgKOH/g, wherein the composition used to form the functional layer is an ionizing radiation curable resin, a thermosetting resin, a thermoplastic resin, or a combination of two or more thereof, and the thermoplastic resin is selected from polyester resins, acrylic resins, The composition used to form the aforementioned easy-to-bond layer is a polyester-acrylic composite resin as the main component, wherein the main component refers to a component that exceeds 50 parts by weight when the total solid content of the components constituting the composition is 100 parts by weight. The aforementioned polyester-acrylic composite resin is a component that, on a weight basis, contains more acrylic resin components than the components of the polyester resin. As in claim 1, the functional component, wherein the surface of the aforementioned substrate on which the aforementioned easy-to-bond layer is laminated is one into which polar groups are introduced by surface treatment. As in claim 2, the functional component, wherein the aforementioned polar group is selected from any one or more of a hydroxyl group, a carboxyl group or a sulfonic acid group. The functional component of any one of claims 1 to 3, wherein the vinyl resin is a polyethylene resin.