JP2001114909A - Sealant film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealant film excellent in heat resistant blocking property and opening property without effecting powdering, heat sealing property, impact strength and low temperature heat sealing property. SOLUTION: The heat sealant film is produced by using a resin composition that is obtained by compounding an ethylene polymer that has an elution peak temperature of low crystalline components of 50-92 deg.C, H/M value of 9 or higher wherein H is the peak height of low crystalline components and M is the height of the minimum valley between the peak of the low crystalline components and the peak of high crystalline components and the area ratio of the area not higher than the elution peak of the low crystalline components to the total area of the TREF of 35% or higher in the TREF elusion curve and MFR of 0.1-20 g/10 min, with an unsaturated aliphatic acid bisamide lubricant and an antiblocking agent, and inflation molding the resin composition to form a sealing layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealant film laminated on a base film so as to impart heat sealability. More specifically, the present invention relates to a sealant film having good heat blocking properties and impact strength, low-temperature heat sealability, and inflation film formation stability.

[0002]

2. Description of the Related Art As packaging materials used in the food packaging field, biaxially stretched nylon films, biaxially stretched polyester films, biaxially stretched polypropylene films, and the like are often used in view of gas barrier properties, moisture proof properties, strength, and the like. It is used. However, since these resin films have a high melting point and poor heat sealability, a sealant film is usually laminated (dry-laminated) to impart heat sealability.

As such a sealant film, a film mainly using a polyolefin resin such as a high-pressure low-density polyethylene, an ethylene / α-olefin copolymer (L-LDPE), an ethylene / vinyl acetate copolymer, or polypropylene is used. Have been. Among them, ethylene / α-
Olefin copolymer films are excellent in transparency, seal strength, hot tack properties, impact resistance, foreign matter sealing properties, and the like, and are widely used as sealant films.

The properties required for a sealant film include film strength such as impact resistance and pinhole resistance, seal strength, blocking resistance, transparency and the like.
All of these are important properties, of which the blocking resistance, specifically, the heat-resistant blocking property that makes blocking at relatively high temperatures difficult and the opening property at the time of bag making, have a great effect on bag making workability. give.

[0005] That is, when a raw film for bag making is stored at a relatively high temperature for a long period of time in summer or the like, if the films adhere to each other due to blocking, the workability for bag making is significantly reduced. Also, at the time of bag making, the inner surface of the film, that is, the heat-sealing surfaces are put together in a bag making machine, and heat-sealed in a U-shape leaving only an opening for charging the filling, and then opening the film. The filling is put in a state in which the films of the parts are opened, but when the inner surface of the bag is in close contact with the opening due to poor opening property, it takes time to open the bag, and the workability is remarkably deteriorated.

In order to solve these problems, a method (powdering) for improving the slipperiness between films by applying a powder such as a niche powder to a raw film for bag making has conventionally been adopted. However, the step of rewinding the raw film and performing powdering requires more than one day, which is not economical. There is also a problem that the powder is a cause of generation of mold and microorganisms, which is not preferable for hygiene.

On the other hand, a method in which a lubricant (slip agent) such as an amide compound and an anti-blocking agent such as an inorganic filler or an organic filler are blended into a resin material for a sealant film has also been adopted as means for solving the above problem. However, even such a method cannot sufficiently prevent blocking. That is, the sealant film has a sealing surface that performs a heat-sealing function, and a treatment surface that is a surface to be adhered to the substrate and is subjected to a surface treatment such as corona treatment and then an adhesive is applied. Since it is easily absorbed by the agent, it gradually moves to the adhesive side during film storage, and eventually moves to the front side of the treated surface to reduce the surface treatment rate such as corona treatment.

Further, when an impact is applied to the film during transportation or transportation, if the impact strength of the film is low, the film may break.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has excellent heat blocking properties and opening properties without heat treatment, heat sealing properties and impact strength, and low temperature heat sealing. It is an object to provide a sealant film having good properties.

[0010]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a sealant film including a seal layer made of a resin material having a specific composition can solve the above-mentioned problems, and have completed the present invention.

That is, the present invention provides a sealant film including a seal layer, wherein the seal layer contains a low crystalline component and a high crystalline component and has the following physical properties (a) to
A polyethylene resin material obtained by mixing 0.01 to 0.25 parts by weight of an amide lubricant and 0.5 to 5 parts by weight of an antiblocking agent with respect to 100 parts by weight of an ethylene polymer satisfying all of (d). A sealant film formed by A) is provided. (A) The elution peak temperature of the low crystalline component in the TREF elution curve is 50 to 92 ° C. (b) The peak height of the low crystalline component is H, and the minimum valley between the peak of the low crystalline component and the peak of the high crystalline component The value of H / M is 9 or more, where M is the height. (C) The ratio of the area below the elution peak temperature of the low crystalline component to the entire area of TREF is 35% or more. (D) MFR is 0.1 to 20 g / 10 minutes

The present invention also relates to an ethylene / α-olefin copolymer obtained by polymerizing the ethylene polymer in the presence of a metallocene catalyst in an amount of 98 to 55% by weight and a high density polyethylene in an amount of 2 to 45% by weight. % Of the resin mixture.

Further, the present invention provides the sealant film, wherein the amide-based lubricant compounded in the polyethylene-based resin material (A) is an unsaturated fatty acid bisamide compound. Further, the present invention provides the sealant film, wherein the film is formed by inflation molding.

[0014] The present invention also relates to a multilayer sealant film, wherein the film includes a seal layer and a treatment layer,
The treated layer contains 100 parts by weight of the polyethylene-based resin containing the ethylene-based polymer as a main component and 0.1 part of an amide-based lubricant.
01 to 0.2 parts by weight, and an antiblocking agent 0.0
The present invention provides the sealant film, wherein the sealant film is formed of a polyethylene resin material (B) containing 5 to 2 parts by weight.

Further, the present invention provides the sealant film, wherein the amide-based lubricant compounded in the polyethylene-based resin material (B) is a monoamide compound of a saturated fatty acid or an unsaturated fatty acid.

The present invention also provides a multilayer sealant film, wherein the film comprises a seal layer, a treated layer, and an intermediate layer provided between the seal layer and the treated layer, wherein the intermediate layer is an ethylene-based film. The present invention provides the sealant film, wherein the sealant film is formed of a polyethylene resin material (C) obtained by blending a polyethylene resin containing a polymer as a main component and an amide lubricant.

Further, in the present invention, the polyethylene resin of the treatment layer and / or the intermediate layer may be such that the ethylene polymer 7
The above-mentioned sealant film, which is a resin mixture of 5 to 97% by weight and 3 to 25% by weight of a high-pressure low-density polyethylene, is provided.

In the present invention, in a sealant film having a seal layer having a heat sealing function, by using an ethylene polymer having a predetermined physical property having a low crystalline component and a high crystalline component for the seal layer, heat resistance blocking property is improved. (For example, a blocking property after holding at 60 ° C. under a load of 15 kg for 3 days) is excellent, and a sealant film having excellent heat sealability and impact strength and strong stiffness can be obtained. This is presumably because the high crystalline component of the ethylene polymer improves the heat blocking property and the low crystalline component improves the heat sealability and impact strength.

In the present invention, the combination of the above-mentioned specific ethylene polymer with a specific amide compound having a high melting point and good slipperiness significantly improves the blocking resistance, particularly the heat blocking resistance.

Further, by adopting inflation molding as a method of forming a film, crystallization of a high crystalline component of the ethylene polymer is promoted, and heat resistance is enhanced.
The heat blocking property is further improved.

Further, in the present invention, by forming the sealant film into a multilayer sealant film having a treatment layer in addition to a seal layer, the heat blocking property after dry lamination is good and the treatment degree of the treatment surface is reduced. Can be advantageously reduced.

In the present invention, transparency can be enhanced by providing an intermediate layer containing only a lubricant between the seal layer and the treatment layer in the multilayer sealant film. Further, in the present invention, transparency and molding stability can be further enhanced by blending low-density polyethylene in one or both of the treated layer and the intermediate layer with the polyethylene resin material.

[0023]

Embodiments of the present invention will be described below. The sealant film of the present invention contains at least a seal layer in its layer constitution. (1) Seal layer The seal layer of the present invention is a layer having a heat sealing function in the sealant film, and forms the inner surface of the bag during bag making. The seal layer is formed of a polyethylene resin material (A) obtained by mixing an amide lubricant and an antiblocking agent with an ethylene polymer.

Ethylene Polymer The ethylene polymer used for the polyethylene resin material (A) of the present invention contains a low crystalline component and a high crystalline component,
In addition, it satisfies all of the following physical properties (a) to (d).

<Physical Properties of Ethylene-Based Polymer> (a) Peak Temperature of Elution Curve by Temperature-Increasing Elution Separation The elution curve of the ethylene-based polymer obtained by temperature-increasing elution fraction has a specific property.

Here, the temperature rise elution fractionation (TREF: Te
(mperature Rising Elution Fraction) is the process of completely dissolving the polymer at a high temperature, then cooling it to form a thin polymer layer on the surface of the inert carrier, and then continuously or stepwise increasing the temperature to elute the eluted components. (Polymer) is recovered, its concentration is continuously detected, and the amount of the eluted component and the elution temperature are determined. A graph drawn by the elution fraction and the elution temperature is an elution curve, from which the composition distribution (molecular weight and crystallinity distribution) of the polymer can be measured. For details on the method and apparatus for measuring temperature rise elution fractionation (TREF), see the Journal of App.
lied Polymer Science, Vol. 26, Nos. 4217-423
1 (1981).

The shape of the elution curve obtained by TREF depends on the molecular weight and the distribution of crystallinity of the polymer. For example, there are one peak, two peaks, three peaks, and the like. In the two-peak curve, a peak having a higher elution temperature has a higher elution fraction than a peak having a lower elution temperature. In some cases, the peak is higher (the height of the peak is higher), the peak having a higher elution temperature has a smaller elution fraction (the height of the peak is lower) than the peak having a lower elution temperature.

Since the ethylene polymer used in the present invention contains at least a low crystalline component and a high crystalline component, it has at least two peaks (elution peaks) of the elution curve. In the case of two peaks, the peak with the higher elution temperature is the elution peak of the high crystalline component, and the one with the lower elution temperature is the elution peak of the low crystalline component.

The ethylene polymer is not particularly limited as long as it has at least two elution peaks. For example, the ethylene polymer may have three or more elution peaks. In this case, the peak having the highest elution temperature among the elution peaks is the elution peak of the high crystalline component, and the peak having the highest elution temperature among the peaks having lower elution temperatures than the elution peak of the high crystalline component is the lower crystal. This is the elution peak of the component. Therefore, in a temperature region lower than the elution temperature of the elution peak of the low crystalline component, a peak having a lower peak height than the elution peak of the low crystalline component may be present, or the elution peak of the high crystalline component and the low crystalline component may be present. A peak having a lower peak height than the elution peak of the low crystalline component may be present between the peak and the elution peak. Further, in both the temperature region lower than the elution temperature of the elution peak of the low crystalline component and the temperature region between the elution peak of the high crystalline component and the elution peak of the low crystalline component, the peak height is higher than the elution peak of the low crystalline component. Lower peaks may be present.

These will be described specifically with reference to the drawings. FIG. 1 shows an elution curve for two peaks, and FIG. 2 shows an elution curve for three peaks. FIG. 2A shows a temperature range lower than the elution temperature of the elution peak of the low-crystalline component,
FIG. 2B shows the case where a peak having a lower peak height than the elution peak of the low crystalline component is present. This represents a case where a peak having a lower peak height than the elution peak of the component exists. In the figure, 1 is an elution peak of a high crystalline component, and 2 is an elution peak of a low crystalline component.

In the present invention, the elution peak temperature of the low crystalline component of the ethylene polymer is 50 to 92 ° C., preferably 60 to 85 ° C., more preferably 65 to 80 ° C. If the peak temperature is higher than the above range, flexibility, transparency, film strength, and low-temperature heat sealability are undesirably reduced. On the other hand, if the peak temperature is lower than the above range, heat resistance and blocking resistance are undesirably reduced.

(B) H / M In the elution curve obtained by the temperature-rise elution fractionation of the ethylene polymer, the peak height of the low crystalline component is defined as H, and the peak of the low crystalline component and the high crystalline component are defined as H. When the height of the minimum valley between the peak and M is M, the value of H / M is 9 or more. Here, the minimum valley is a portion where the height is minimum among the valleys formed between the elution peak of the low crystalline component and the elution peak of the high crystalline component. If the value of H / M is less than 9, transparency and film strength are undesirably reduced. 1 and 2 show H and M.

(C) Area Ratio In the ethylene polymer, the area ratio of the low crystalline component below the elution peak temperature to the entire area of the elution curve obtained by the temperature rise elution fractionation is 35% or more. If the area ratio is smaller than 35%, the flexibility, transparency and film strength are undesirably reduced. In FIGS. 1 and 2, the area below the elution peak temperature of the low crystalline component is indicated by oblique lines.

(D) MFR The ethylene polymer has an MFR (melt flow rate) of 0.1 to 20 g / 10 minutes, preferably 0.1 to 20 g / 10 minutes.
15 g / 10 min, more preferably 0.1 to 10 g / 10
Minutes. The MFR mentioned here is JIS-K7210 (1
90 ° C., 2.16 kg load). If the MFR value is larger than the above range, heat resistance and film strength decrease, and film formation of the film becomes unstable. On the other hand, if the MFR is smaller than the above range, the resin pressure becomes high, and the extrudability decreases, which is not preferable.

(E) Density The density of the ethylene polymer is not particularly limited.
But preferably 0.890 to 0.930 g / cm³, Yo
More preferably 0.900 to 0.925 g / cm ³,In particular
Preferably 0.905 to 0.920 g / cm³It is.
If the density is within this range, the flexibility and impact strength are good.
This is preferred. The density referred to here is JIS-K7
This is a value measured in accordance with No. 112.

(F) Q value The Q value of the ethylene polymer is not particularly limited, but is preferably 3 or less, more preferably 2.7 or less.
Especially preferably, it is 2.5 or less. Here, the Q value is a value determined by size exclusion chromatography (SEC). If the Q value is larger than the above range, the transparency of the film tends to deteriorate.

<Composition of Ethylene Polymer> As the ethylene polymer of the present invention satisfying the above physical properties (a) to (d), those satisfying the physical properties (a) to (d) alone (that is, Ethylene polymer having both a low crystalline component and a high crystalline component) may be used alone, or two or more ethylene polymers may be mixed to obtain the above physical properties (a) to (d). A filled resin mixture may be used.

(I) Ethylene-based polymer which satisfies the above physical properties (a) to (d) alone: Examples of the ethylene-based polymer which satisfies the above physical properties (a) to (d) alone include the ethylene-α-
Olefin copolymers are exemplified. In such a polymer, for example, as a well-known method for controlling the molecular weight and the distribution of crystallinity, a polymer having desired physical properties can be obtained by appropriately adopting a method of adjusting the polymerization temperature and the amount of the comonomer.

The ethylene / α-olefin copolymer has a structural unit derived from ethylene as a main component, and the α-olefin used as a comonomer is preferably a 1-olefin having 3 to 18 carbon atoms. It is. Specific examples of 1-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-heptene, 4-methyl-pentene-1,4
-Methyl-hexene-1,4,4-dimethylpentene-
1 and the like. Preferably has 4 or more carbon atoms,
Particularly preferred are those having 6 or more carbon atoms. Specific examples of the ethylene / α-olefin copolymer include an ethylene / 1-butene copolymer, an ethylene / 1-hexene copolymer, and an ethylene / 1-octene copolymer.

The α-olefin used as a comonomer is not limited to one kind, and a multi-component copolymer using two or more kinds such as a terpolymer is also preferable. Specific examples include an ethylene / propylene / 1-butene terpolymer.

(Ii) Resin mixture satisfying the above properties (a) to (d): as the ethylene polymer of the present invention, two or more resins are mixed to satisfy the above properties (a) to (d). In the case of using a resin mixture having a reduced temperature, fractionation (T
REF) In the elution curve, the elution peak temperature is 50-9.
2 ° C. ethylene polymer component (low crystalline component: component A)
It is preferable to use a mixture of an ethylene-based polymer component having a higher elution peak temperature (high crystalline component: component B).

[Component A] The ethylene polymer component used as the component A (low crystalline component) is preferably an ethylene / α-olefin copolymer, and the ratio of ethylene to comonomer and the type of comonomer are as follows. This is the same as the case of the ethylene / α-olefin copolymer which satisfies the above-mentioned properties (a) to (d) alone.

The MFR of component A is preferably 0.1 to 2
0 g / 10 min, more preferably 0.1 to 15 g / 10 min
And the density is preferably 0.890 to 0.930 g /
cm ³, More preferably 0.900 to 0.925 g / c
m³It is. If the MFR is within this range, the film strength
This has the advantage of excellent film formation stability and density.
If it is within the range, it is said to be excellent in flexibility and pinhole resistance
Has advantages. Specific examples of the component A include ethyl
1-hexene copolymer, ethylene / 1-octene copolymer
Polymers, ethylene / 1-butene copolymer and the like.
You.

[Component B] The ethylene polymer component used as the component B may be either an ethylene homopolymer or an ethylene copolymer. In the case of the ethylene-based copolymer, the ratio of ethylene to the comonomer and the type of the comonomer are the same as those of the ethylene / α-olefin copolymer which satisfies the above-mentioned physical properties (a) to (d) alone. is there.

The MFR of component B is preferably from 0.1 to 5
0 g / 10 min, more preferably 0.5 to 40 g / 10
Min, particularly preferably 5 to 20 g / 10 min, and the density is preferably 0.930 to 0.970 g / cm ³ , more preferably 0.935 to 0.968 g / cm ³ . M
When the FR is in this range, the film forming stability is good, and when the density is in this range, the heat resistance is good. Component B
Specific examples of high-density polyethylene, ethylene / 1
-Butene copolymer, ethylene / 1-hexene copolymer,
Examples thereof include an ethylene / 1-octene copolymer. Of these, high density polyethylene is particularly preferred.

[Blending Ratio of Component A and Component B] The blending ratio of Component A and Component B in the resin mixture is not particularly limited, but 98 to 55% by weight of Component A is more preferable, based on the total amount of the resin mixture. Is 95 to 60% by weight, and component B is 2 to 4
The content is preferably 5% by weight, more preferably 5 to 40% by weight.

<Production method of ethylene-based polymer> Production of the above-mentioned ethylene-based polymer (including an ethylene / α-olefin copolymer when used alone and a component A and a component B when used as a resin mixture) As for the method, there is no particular limitation on the polymerization method and catalyst as long as a product satisfying the above physical properties can be produced.

For example, as the catalyst, a Ziegler type catalyst (based on a combination of a supported or unsupported halogen-containing titanium compound and an organoaluminum compound), a Phillips type catalyst (based on supported chromium oxide (Cr ⁶⁺ )), Kaminsky Type catalysts (based on a combination of a supported or unsupported metallocene compound and an organoaluminum compound, particularly an alumoxane or an ionic compound formed from an ion pair of a cation and an anion) and the like.

The metallocene-based catalyst is specifically described in JP-A-58-19309, JP-A-59-95292, JP-A-60-35005, JP-A-60-35006, and JP-A-60-1985. No. 35007, JP-A-60-35008,
JP-A-60-35009, JP-A-61-130314
JP-A-3-1630088, European Patent Application Publication No. 420,436, U.S. Pat.
055,438, and International Publication WO 91
/ 04257 and metallocene catalysts or metallocene / alumoxane catalysts, or a metallocene compound as disclosed in, for example, International Publication WO92 / 07123 and the like, and reacted with the metallocene compound And a catalyst comprising a compound that becomes a stable ion.

The component B (highly crystalline component) when a resin mixture is used as the ethylene-based polymer is not particularly limited in terms of catalyst as long as it satisfies the above conditions. Can be demonstrated.

On the other hand, component A having an elution peak on the low temperature side
(Low crystalline component: ethylene / α-olefin copolymer)
Does not contain high or low crystalline components by itself,
Those having a relatively narrow composition distribution are preferred. Therefore, a polymer polymerized in the presence of a metallocene catalyst using a metallocene compound containing a tetravalent transition metal, particularly a Kaminsky catalyst, is preferred. Specific examples of the metallocene compound include mono-, di-, or tri-cyclopentadienyl or substituted cyclopentadienyl metal compounds.

Specific polymerization methods include a slurry method in the presence of these catalysts, a gas phase fluidized bed method (for example, a method described in JP-A-59-23011), a solution method, and a method in which the pressure is 200 kg. / Cm ² or more and polymerization temperature of 100
High-pressure bulk polymerization method at a temperature of not less than ° C.

When an ethylene / α-olefin copolymer which satisfies the above physical properties (a) to (d) is used alone as the ethylene polymer, the ethylene / α-olefin copolymer is usually used.
-A method of producing an olefin copolymer in one reaction vessel is employed.

When a resin mixture of two or more components such as the components A and B is used as the ethylene-based polymer, a method for producing each component in one reaction tank and two or more reaction tanks are used. A method for continuously producing a resin composition satisfying the above-mentioned physical properties (a) to (d) by linking and polymerizing each component in each tank, and polymerizing each component separately, and then a normal resin composition Various methods such as a method of obtaining a resin mixture satisfying the above physical properties (a) to (d) can be adopted by mixing the components according to the same method as the production method of the above.

More specifically, the component A (low-crystal component) and the component B (high-crystal component) may be dry-blended in advance, and the resulting blend may be directly charged into a hopper of a molding machine. Further, the blended material is melted and kneaded using an extruder, a Brabender blast graph, a Banbury mixer, a kneader blender, and the like, and is then pelletized by a commonly used method, and then subjected to production of a film or sheet. Is also good.

<Specific Examples of Ethylene Polymer> Particularly preferred examples of the ethylene polymer used in the polyethylene resin material (A) of the present invention include ethylene / 1-hexene copolymer produced by a metallocene catalyst. It is a resin mixture obtained by blending 95 to 60% by weight of a combined or ethylene / 1-octene copolymer with 5 to 40% by weight of high-density polyethylene (HDPE).

Amide-Based Lubricant The amide-based lubricant used in the present invention includes a saturated fatty acid monoamide compound, an unsaturated fatty acid monoamide compound, a saturated fatty acid bisamide compound, and an unsaturated fatty acid bisamide compound. Among them, an unsaturated fatty acid bisamide compound is particularly preferable as a compound to be incorporated into the seal layer. Specific examples of the unsaturated fatty acid bisamide compound include ethylene bisoleic acid amide and ethylene bis erucic acid amide. Since unsaturated fatty acid bisamide compounds have high melting points and long molecular chains,
Since it has a good balance of heat resistance and slipperiness at a high level, when used in combination with the ethylene polymer of the present invention, which has excellent heat resistance, the heat resistance is higher than when a saturated fatty acid bisamide compound or a monoamide compound is blended. The blocking property is significantly improved. It should be noted that the unsaturated fatty acid monoamide may be used in combination as long as the blocking resistance is not impaired.

The blending amount of the amide-based lubricant in the polyethylene-based resin material (A) depends on the amount of the ethylene-based polymer 10
It is 0.01 to 0.25 parts by weight, preferably 0.03 to 0.2 parts by weight, based on 0 parts by weight. If the compounding amount is less than the above range, the blocking resistance and the slipperiness of the film are inferior, so that it is not preferable. .

Antiblocking Agent The antiblocking agent used in the polyethylene resin material (A) may be either organic fine particles or inorganic fine particles. Examples of the organic fine particles include polymer fine particles made of polymethyl methacrylate, polystyrene, nylon or the like and obtained by emulsion polymerization or suspension polymerization. Examples of the inorganic fine particles include diatomaceous earth, silica, zeolite, and aluminosilicate.

The average particle size of the fine particles used as the anti-blocking agent is preferably 5 μm or more, and more preferably 6 to 15 μm. If the average particle size is less than the above range, the effect of improving the anti-blocking property is undesirably reduced. On the other hand, if the average particle size is too large, the appearance of the film becomes poor, which is not preferable.

The compounding amount of the antiblocking agent in the polyethylene resin material (A) is 0.05 to 5 parts by weight, preferably 0.1 to 3 parts by weight based on 100 parts by weight of the ethylene polymer. If the amount is less than the above range, the blocking resistance is insufficient, and if the amount exceeds the above range, the transparency is undesirably reduced.

Other Ingredients The polyethylene resin material (A) generally contains, in addition to the essential components of the ethylene polymer, the amide lubricant and the antiblocking agent, a resin composition as long as the effects of the present invention are not significantly impaired. Auxiliary additives used for products can be blended as required. Such auxiliary components include, for example, antioxidants, crystal nucleating agents, clarifying agents, light stabilizers, heat stabilizers, ultraviolet absorbers, antistatic agents, antifogging agents, neutralizing agents, metal inerts Agents, colorants, dispersants, fillers, fluorescent whitening agents and the like. As the antioxidant, phenol-based and phosphorus-based antioxidants are preferable.

Method for Producing Polyethylene Resin Material (A) The polyethylene resin material (A) of the present invention is obtained by mixing the above-mentioned essential components and auxiliary additives and melt-kneading them. For melt-kneading, for example, each component in the form of powder, pellets, etc. is extruded in a single screw or twin screw, a Henschel mixer, a super mixer, a V blender,
This is performed using a kneader such as a tumbler mixer, a ribbon blender, a Banbury mixer, a kneader blender, a Brabender plastograph, a small batch mixer, a continuous mixer, and a mixing roll. The kneading temperature is generally from 180 to 270 ° C. Further, the kneader may be a combination of two or more of the above-described kneaders. In addition, each component may be dry-blended in advance, and the blended product may be directly charged into a hopper of a film forming machine. When a resin mixture of the component A having an elution peak on the low temperature side and the component B having an elution peak on the high temperature side is used as the ethylene polymer, either of the two components may be used before, during or after mixing. One or both of them may be blended with the above-mentioned auxiliary additives.

(2) Treatment Layer The sealant film of the present invention may be a multilayer film including a treatment layer in addition to the above-mentioned seal layer. In the sealant film of the present invention, the treatment layer can be provided on the side of the adhesion to the substrate (dry lamination side), and after applying a surface treatment to the surface of the treatment layer, an adhesive is applied. Is laminated with the base material. The treatment layer is formed of a polyethylene resin material (B) obtained by mixing an amide lubricant and an antiblocking agent with a polyethylene resin containing an ethylene polymer as a main component.

Polyethylene Resin The ethylene polymer which is the main component of the polyethylene resin used for the polyethylene resin material (B) is the same as the ethylene polymer used for the polyethylene resin material (A). It can be selected from those satisfying physical properties (a) to (d). That is, the above physical properties (a) to
An ethylene / α-olefin copolymer having a low crystalline component and a high crystalline component simultaneously satisfying (d) alone, or an elution peak temperature of 65 to 92 in a TREF elution curve.
And at least two types of ethylene including an ethylene / α-olefin copolymer component (low-crystalline component: component A) and an ethylene-based polymer component having a higher elution peak temperature (high-crystalline component: component B). The above physical properties (a) to
A resin mixture satisfying (d) is exemplified. The ethylene polymer of the seal layer and the ethylene polymer of the treatment layer may be the same or different.

The polyethylene-based resin used for the polyethylene-based resin material (B) contains the above-mentioned ethylene-based polymer as a main component, and may be composed of only the ethylene-based polymer. A blend of high-pressure low-density polyethylene (HP-LDPE) is preferred. By blending the high-pressure low-density polyethylene, the stability of film formation during molding is improved, and the transparency is also improved. The compounding amount of the high-pressure method low-density polyethylene is preferably 3 to 25% by weight, more preferably 5 to 25% by weight based on the total amount of the polyethylene resin.
To 20% by weight, and the above-mentioned physical properties (a) to (d) by mixing the ethylene-based polymer (at least two kinds of ethylene-based polymers are mixed);
Such as ethylene-α-
(Including a resin mixture of an olefin copolymer and a high-density polyethylene) is preferably 75 to 97% by weight,
More preferably, it is 80 to 95% by weight.

When the sealant film of the present invention is a multilayer film containing the above-mentioned treatment layer, if the high-pressure low-density polyethylene is added to the polyethylene resin material (A) forming the seal layer, the film surface becomes smooth. It is preferable to add it only to the treatment layer, since it becomes easy to cause blocking resistance.

Amide-based lubricant The amide-based lubricant blended in the polyethylene resin material (B) can be selected from the same amide compounds as those used in the polyethylene resin material (A). An unsaturated fatty acid bisamide compound is preferably used in the polyethylene resin material (A), whereas a monoamide compound is preferably used in the polyethylene resin material (B). The use of a bisamide compound is not preferred because the surface treatment rate of the treated layer tends to decrease. Monoamide compounds used include erucamide, oleic amide and the like.

If the melting point of the amide-based lubricant used for the seal layer is Ta (° C.) and the melting point of the amide-based lubricant used for the treated layer is Tb (° C.), the difference (T
a-Tb) is represented by the following formula (I), preferably (II)
It is preferable to select the amide-based lubricant in both layers so as to satisfy the above. If Ta−Tb does not satisfy the above-mentioned formula, the balance between blocking resistance, slipperiness, and reduction in processing degree is poor, which is not preferable.

[0070]

## EQU1 ## Ta−Tb ≧ 25 (° C.) (I) Ta−Tb ≧ 30 (° C.) (II)

The blending amount of the amide lubricant in the polyethylene resin material (B) is 100
The amount is 0.01 to 0.2 part by weight, preferably 0.03 to 0.2 part by weight based on part by weight. If the amount is less than the above range, the slipperiness of the film is inferior, so that it is not preferable. If the amount exceeds the above range, the processing degree is lowered and the transparency due to bleed-out is lowered.

Antiblocking Agent The antiblocking agent used in the polyethylene resin material (B) may be either organic fine particles or inorganic fine particles. Among the same fine particles as those used in the polyethylene resin material (A) described above. You can choose from. The average particle size of the antiblocking agent used for the polyethylene resin material (B) is not limited, and can be selected from a wider range than that used for the polyethylene resin material (A). The preferred average particle size is 2.
It is about 5 to 15 μm.

The compounding amount of the antiblocking agent in the polyethylene resin material (B) is 0.01 to 2 parts by weight, preferably 0.05 to 1 part by weight, based on 100 parts by weight of the polyethylene resin. When the amount is less than the above range, the blocking resistance is insufficient, and when the amount exceeds the above range, the transparency and the like are undesirably reduced.

Other Ingredients The polyethylene resin material (B) is generally a resin composition in addition to the essential components of the polyethylene resin, the amide lubricant and the antiblocking agent, as long as the effects of the present invention are not significantly impaired. Auxiliary additive components used for applications can be blended as required. Such an auxiliary additive component can be selected from those exemplified as usable in the polyethylene resin material (A).

Method for Producing Polyethylene Resin Material (B) The polyethylene resin material (B) of the present invention is prepared by mixing essential components and auxiliary additives and melting the same as in the case of the polyethylene resin material (A) described above. It is obtained by kneading. The melt-kneaded product may be formed into a pellet by a usual method and then provided for film production. Alternatively, each component may be dry blended in advance, and the blended product may be directly charged into a hopper of a film forming machine.

(3) Intermediate layer When the sealant film of the present invention is a multilayer sealant film including the seal layer and the treatment layer, a polyethylene resin and an amide lubricant are further provided between the seal layer and the treatment layer. And an intermediate layer formed of a polyethylene-based resin material (C). Thereby, the transparency of the sealant film can be further improved.

Polyethylene Resin The ethylene polymer which is the main component of the polyethylene resin used in the polyethylene resin material (C) is the ethylene polymer used in the polyethylene resin materials (A) and (B) described above. Can be selected from those satisfying the above physical properties (a) to (d). That is, an ethylene / α-olefin copolymer having a low crystalline component and a high crystalline component simultaneously satisfying the above physical properties (a) to (d) alone, or ethylene having an elution peak temperature of 65 to 92 ° C. in a TREF elution curve. An α-olefin copolymer component (low crystalline component: component A) and an ethylene polymer component having a higher elution peak temperature (high crystalline component: component B)
And a resin mixture obtained by mixing two or more kinds of ethylene-based polymers containing the above so as to satisfy the above physical properties (a) to (d). The ethylene polymer of the intermediate layer may be the same as or different from the ethylene polymer of the seal layer and the treatment layer.

The polyethylene resin used for the polyethylene resin material (C) is mainly composed of the above-mentioned ethylene polymer, and may be composed of only the ethylene polymer. A blend of high-pressure low-density polyethylene (HP-LDPE) is preferred. By blending the high-pressure low-density polyethylene, the stability of film formation during molding is improved, and the transparency is also improved. The compounding amount of the high-pressure method low-density polyethylene is preferably 3 to 25% by weight, more preferably 5 to 25% by weight based on the total amount of the polyethylene resin.
To 20% by weight, and the above-mentioned physical properties (a) to (d) by mixing the ethylene-based polymer (at least two kinds of ethylene-based polymers are mixed);
Such as ethylene-α-
(Including a resin mixture of an olefin copolymer and a high-density polyethylene) is preferably 75 to 97% by weight,
More preferably, it is 80 to 95% by weight.

If the high-pressure method low-density polyethylene is also blended with the polyethylene resin material (A) forming the sealing layer, the surface of the film is likely to be smooth and the blocking resistance may be reduced. When it is provided, it is preferably added to at least one of the treatment layer and the intermediate layer.

Amide-based lubricant An amide-based lubricant is blended in the polyethylene resin material (C) forming the intermediate layer. If the amide-based lubricant is not blended in the intermediate layer, the amide-based lubricant blended in the seal layer and the treatment layer tends to move to the intermediate layer and reduce the blocking resistance.

The amide lubricant used here can be selected from the same amide compounds as those used in the polyethylene resin materials (A) and (B). Unsaturated fatty acid bisamide compounds are preferably used in the polyethylene resin material (A), and monoamide compounds are preferably used in the polyethylene resin material (B), whereas the polyethylene resin material (C) is preferably used in the polyethylene resin material (C). What is used may be any of a bisamide compound and a monoamide compound. More preferred are monoamide compounds.

The compounding amount of the amide-based lubricant in the polyethylene-based resin material (C) is as follows.
It is 0.01 to 0.25 parts by weight, preferably 0.03 to 0.2 parts by weight, based on 00 parts by weight. If the compounding amount is less than the above range, the film has insufficient slipperiness. Therefore, if it exceeds the above range, the bleed-out tends to lower the transparency and the processing degree, which is not preferable. The anti-blocking agent does not have to be blended with the polyethylene resin material (C) forming the intermediate layer.

Method for Producing Polyethylene Resin Material (C) The polyethylene resin material (C) of the present invention comprises an essential component and an auxiliary additive component as in the case of the polyethylene resin materials (A) and (B) described above. Are mixed and melt-kneaded. The melt-kneaded product may be formed into pellets by a usual method and then provided for film production. Alternatively, each component may be dry blended in advance, and the blended product may be directly charged into a hopper of a film forming machine.

(4) Layer Structure The sealant film of the present invention may be a single layer of the seal layer as long as it contains the above-mentioned seal layer.
Further, it may be a multilayer sealant film including other layers. In the case of a multilayer sealant film, a film containing the above-mentioned sealing layer and treatment layer is preferable. In the case of such a multilayer sealant film, the layer structure may be a two-layer structure of only the seal layer and the treatment layer, or a three-layer structure of a seal layer / intermediate layer / treatment layer by providing the above-mentioned intermediate layer. Is also good. Further, a layer having various functions, for example, a gas barrier layer or the like can be appropriately provided between the respective layers.

The thickness ratio of each layer is not particularly limited, but it is preferable that the ratio of the sealing layer / the processing layer is 1/1 to 1/10.
When an intermediate layer is provided, it is preferable that the ratio of seal layer / intermediate layer / processed layer = 1: 1: 1 to 1: 10: 1. If the thickness ratio of the sealing layer is too small, the heat sealing strength is insufficient, and if it is too large, the transparency tends to be poor, which is not preferable.

The specific thickness of the sealant film of the present invention is not particularly limited, but is preferably 20 to 130 μm.
m, more preferably about 30 to 100 μm.

(4) Method for Producing Sealant Film The method for producing the sealant film of the present invention is not particularly limited, and any conventionally known method such as a T-die molding method and an inflation molding method may be employed. When the sealant film is a multilayer sealant film, a conventionally known method for producing a multilayer film, such as a water-cooled or air-cooled coextrusion inflation method, a coextrusion T-die method, a dry lamination method, an extrusion lamination method, etc. Can also be adopted. Of these, the preferred method in the present invention is the inflation molding method.

In the inflation molding, unlike the T-die molding, rapid cooling is not performed (slow cooling). Therefore, the inflation molding is performed by using a polyethylene resin material blended with the specific ethylene polymer of the present invention. , T
The crystallization rate of the high crystalline component of the ethylene-based polymer becomes slower than in the case of die molding, and the heat blocking property is easily improved. The conditions for the inflation molding may be those conventionally known, and the resin temperature is usually 140
About 220 ° C.

(5) Use The sealant film of the present invention is used for laminating on various base films to impart heat sealability to the base films.

As the base film to be laminated, a biaxially stretched nylon film, a biaxially stretched polyester film, a biaxially stretched polypropylene film, a polyvinylidene chloride coated film, an ethylene / vinyl alcohol (EVO)
H) film, polystyrene film, aluminum,
Alumina, silica, vapor-deposited film of silica-alumina, etc.
Examples include metal foils such as aluminum.

Examples of the method of laminating on the substrate film include a dry laminating method, a sandwich laminating method, a wet laminating method, a hot melt method, and a non-solvent laminating method. Of these, the dry laminating method is excellent in adhesive strength. preferable.

In the case of laminating with a base film, the surface of the treatment layer is subjected to a surface treatment in advance. Examples of the surface treatment method include various treatment methods such as a corona discharge treatment method, an ozone treatment method, a flame treatment method, and a low-temperature plasma treatment method. Of these, corona discharge treatment is the most common and preferred. At the time of lamination, after performing such surface treatment, an adhesive for dry lamination, for example, a polyether-based polyurethane adhesive, a polyester-based polyurethane adhesive, or the like is applied to the surface of the treated layer, and then a base film is laminated.

The sealant film of the present invention is excellent in heat sealability and transparency, and has a high elasticity and a strong stiffness. Particularly excellent in heat blocking properties, for example, 60 ℃,
The blocking resistance after holding for 3 days under a load of 15 kg is extremely excellent. For example, even when stored for a long period of time, such as in the summer, there is no blocking, and the workability does not deteriorate even if the bag is directly used for bag making. Also, the opening property at the time of bag making is good and the workability of filling the contents is excellent.

[0094] Here, the bag-forming film raw material on which the sealant film of the present invention is laminated is passed through a bag-making machine to obtain 3
Used to make side seal bags. The three-side sealed bag refers to a bag that is heat-sealed in a U-shape, leaving only the upper or lower portion for the filling to be left as an opening.
The manufactured three-side seal bag is then opened and its contents are filled. If the opening of this opening is good,
At the time of filling the contents, which is a process after bag making, the bag is already opened, and the workability is very good. On the other hand, if the inner surfaces of the bags are in close contact with each other, it takes time to open the bags, and the workability deteriorates. Therefore, the opening property representing the ease of opening the bag at this time is an important characteristic that greatly affects the workability during bag making, and in the present invention, the blocking resistance between films is excellent, and the Has openness.

Thus, the laminated film obtained by laminating the sealant film of the present invention on a base film can be suitably used as a packaging material for bag making in the fields of food packaging and medical applications.

[0096]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. The measurement of various physical properties of the resin and the molding and evaluation of the laminate in these Examples and Comparative Examples were performed by the following methods.

1. Method for Measuring Physical Properties of Resin (1) MFR Measured according to JIS-K7210 (190 ° C., 2.16 kg load). (2) Density Measured according to JIS-K7112.

(3) Q value Size Exclusion Chromatography
(atography: SEC) under the following measurement conditions, and the Q value was determined as weight average molecular weight / number average molecular weight. A universal calibration curve was made with monodisperse polystyrene and calculated as the molecular weight of linear polyethylene. Apparatus: Waters Model 150C GPC Solvent: o-dichlorobenzene Flow rate: 1 ml / min Temperature: 140 ° C Measurement concentration: 200 μm Column: Showa Denko KK, three AD80M / S

(4) Measurement of Elution Curve Obtained by TREF: Elevated Temperature Elution Fractionation (TREF) in the present invention
The peak of the elution curve due to was eluted after once completely dissolving the polymer at high temperature, cooling, forming a thin polymer layer on the surface of the inert carrier, and then increasing the temperature continuously or stepwise. A component (polymer) was recovered, the temperature was continuously detected, and the amount (elution amount) of the eluted component and the elution temperature were determined. The peak of the elution curve of the present invention is determined from the graph (elution curve) drawn thereby, and the composition distribution of the polymer is measured.

The elution curve was measured specifically as follows. The measurement was carried out using a cloth separation apparatus (CFC T150A, manufactured by Mitsubishi Chemical Corporation) as a measurement apparatus according to the measurement method in the attached operation manual. This cross-separation apparatus comprises a temperature-rise elution fractionation (TREF) mechanism for fractionating a sample by using a difference in dissolution temperature, and a size exclusion chromatograph (SEC) for further fractionating the fractionated fraction by molecular size. ) And online.

First, the sample to be measured (ethylene / α
-Olefin copolymer) using a solvent (o-dichlorobenzene) to give a concentration of 4 mg / ml.
It was melted at ℃ and injected into a sample loop in the measuring device. The following measurements were performed automatically according to the set conditions.

The sample solution held in the sample loop is separated using a difference in dissolution temperature by a TREF column (inside diameter of 4 m filled with glass beads as an inert carrier).
m, 150mm length stainless steel column attached to the device)
Was injected 0.4 ml. The sample was cooled at a rate of 1 ° C./min from 140 ° C. to 0 ° C. and coated on the inert carrier. At this time, from the high crystal component (the one that is easy to crystallize) to the low crystal component (the one that hardly crystallizes)
The polymer layer is formed on the surface of the inert carrier in this order.

After holding the TREF column at 0 ° C. for an additional 30 minutes, 2 ml of the component dissolved at a temperature of 0 ° C.
Injection was performed from a TREF column to a SEC column (AD80MS, manufactured by Showa Denko KK, three pieces) at a flow rate of 1 / min.
While fractionation by molecular size is being performed at SEC, TR
In the EF column, the temperature was raised to the next elution temperature (5 ° C.) and maintained at that temperature for about 30 minutes. The measurement of each elution section by SEC was performed at intervals of 39 minutes. The following temperature was used as the elution temperature, and the temperature was raised stepwise.

Elution temperature (° C.): 0, 5, 10, 15, 2
0, 25, 30, 35, 40, 45, 49, 52, 5
5,58,61,64,67,70,73,76,7
9,82,85,88,91,94,97,100,1
02,120,140 ° C.

For the solution fractionated according to the molecular size in the SEC column, the absorbance in proportion to the concentration of the polymer was measured with an infrared spectrophotometer attached to the apparatus (wavelength 3.42 μm).
m, detection by stretching vibration of methylene) to obtain chromatograms for each elution temperature category. Using built-in data processing software,
A baseline of the chromatogram of each elution temperature section obtained by the above measurement was drawn and subjected to arithmetic processing. The area of each chromatogram was integrated and an integrated elution curve was calculated. Also,
This integrated elution curve was differentiated by temperature to calculate a differential elution curve. The plot of the calculation results was output to a printer. In the plot of the output differential elution curve, the elution temperature is plotted on the horizontal axis.
The difference was 89.3 mm per 0 ° C. and the differential amount on the vertical axis (elution fraction: the total integrated elution amount was standardized to 1.0, and the change at 1 ° C. was defined as the differential amount) at 76.5 mm per 0.1. .

Next, the temperature at the peak on the low temperature side from the differential elution curve is defined as the peak temperature of the elution curve of the low crystalline component (component A). The value of H / M was calculated assuming that the height was H and the height of the minimum valley between the low crystalline component (component A) and the high crystalline component (component B) was M. Next, from the integrated elution curve, the area ratio of the low crystalline component (component A) to the entire area, which was lower than the elution peak temperature, was determined.

2. Evaluation Method of Physical Properties of Film (1) Haze (HAZE) Measured according to JIS-K7105. The smaller the value, the higher the transparency and the better. (2) Impact strength In accordance with JIS-P8134, a 13.0 mm hemispherical metallic glossy metal penetration is attached to the tip of the arc-shaped arm of the pendulum and measured at 23 ° C and 50% humidity. did.

(3) Heat seal rising temperature Two sheets of the sealant film of the present invention were stacked so that the untreated surfaces of the corona overlapped, and a sealing pressure of 2 kg was applied at intervals of 80 ° C. to 5 ° C. using a hot plate heat sealer manufactured by Toyo Seiki. / Cm ² ,
Heat seal with a sealing time of 0.5 sec.
The heat seal strength was measured with a tensile tester at 3 ° C. and a humidity of 50%. Heat seal strength is 300g / 15m
The seal temperature when the temperature reached m was taken as the heat seal temperature under a load of 300 g, which was used as a measure of the low-temperature heat sealability.

3. Method for evaluating physical properties of dry laminated product [Blocking at 60 ° C.] A test piece was obtained by laminating the seal surfaces of a multilayer film obtained by dry lamination to a size of 2 cm × 5 cm. The test piece was sandwiched on both sides by thin paper, and both sides were sandwiched between glass plates of 20 cm × 15 cm, and placed in a thermostat at 60 ° C.
g and left standing for 3 days. Thereafter, the sample was taken out, and both ends where the film was not overlapped were sandwiched between chucks under the conditions of 23 ° C. and 50% humidity, and the tensile tester was used for 5 minutes.
The shear peel strength was measured at 00 mm / min.

4. Materials used In the following examples, the polyethylene resin PE shown in Table 1 was used.
1 to PE5, 0.05% by weight of phenolic antioxidant (manufactured by Ciba Specialty Chemicals Co., Ltd .; trade name "IRGANOX 1076") to PE1 to PE5, phosphorus-based antioxidant (Ciba -0.1% by weight of Specialty Chemicals Co., Ltd .; trade name "IRGAFOS 168") was added and pelletized at 160 ° C with a single screw extruder.

As a control, a linear low-density polyethylene (manufactured by Nippon Polychem Co., Ltd., trade name: Novatec LLS)
F240 ") was used as PE6. Further, as the high-density material used in the present invention, a high-density polyethylene (trade name “Novatech HD HJ56” manufactured by Nippon Polychem Co., Ltd.) is used.
0 ") was used as PE7. As the high-pressure method low-density polyethylene (LDPE) used in the present invention, a product name “Novatech LD LF24” manufactured by Nippon Polychem Co., Ltd.
"0" was used as PE8. Table 1 shows the basic physical properties of PE1 to PE8.

[0112]

[Table 1]

[Preparation of Resin Composition] As the resin composition used in the present invention, 90% by weight of PE1 and 10% by weight of PE7 obtained above were blended with a Henschel mixer, and then mixed with a single screw extruder. Pelletize at 170 ° C and TRE
F. The elution temperature of the low crystal component in the elution curve = 75 ° C., the ratio of the peak height H of the low crystal component to the height M of the minimum valley between the peak of the low crystal component and the peak of the high crystal component (H /
M) = 48, and a composition C1 was prepared in which the area ratio of the low crystalline component to the total area of the TREF was equal to or lower than the peak temperature of the low crystal component = 70%. The composition was changed in the same manner, and the compositions C2 to C4
Was prepared. Table 2 shows the resin composition of C1 to C4.

[0114]

[Table 2]

[Film Forming] Using the ethylene / α-olefin copolymer and the resin composition prepared by the above method, multilayer inflation molding was performed under the following conditions.
Furthermore, by corona discharge treatment machine attached to apparatus,
The treated layer was subjected to corona treatment so that the surface tension of the film surface became 44 to 45 dyne / cm, to obtain a polyethylene-based multilayer sealant film. Table 3 shows the anti-blocking agents and lubricants added during molding.

(Molding conditions) Model: Multi-layer inflation molding machine Extruder screw diameter: Processing layer / intermediate layer / seal layer = 40
mmφ / 40mmφ / 40mmφ Temperature; 180 ° C Die diameter; 200mmφ Die lip; 3mm Die temperature; 180 ° C Blow ratio; 2.0 Film thickness;

[0117]

[Table 3]

[Production of Dry Laminate Product] A multilayer film obtained by the above-mentioned inflation molding and a biaxially stretched nylon film (Mitsubishi Chemical Kojin Pax Co., Ltd.)
The product (trade name: “Santonil SN”, thickness: 15 μm) was subjected to dry lamination using the corona-treated surface as a bonding surface. Adhesive is used as the main ingredient of Toyo Morton Co., Ltd.
The mixing ratio of the polyether-based adhesive TM-329 / CAT-8B manufactured by Co., Ltd. was 1/1, and the coating amount after drying was 2.5 g / m ² . The obtained dry laminated film is 4 ° C at 40 ° C.
Aging was performed for 8 hours.

[0119]

Example 1 As a treatment layer, C1 obtained by the above method was used.
AMT 100 as an anti-blocking agent
Parts by weight and a lubricant to which 0.06 parts by weight of EA was added were used. 1.2 parts by weight of AMT100 as an antiblocking agent and EB as a lubricant
What added 0.08 weight part of OA was used. The treatment layer and the seal layer were subjected to inflation molding using two extruders under the above conditions so that the treatment layer / seal layer = 34 μm / 16 μm to obtain a multilayer sealant film. Dry lamination was performed using the multilayer sealant film under the above conditions to obtain a dry laminated film. These sealant films and dry laminate films were evaluated. Table 4 shows the results.

[0120]

Example 2 As a treatment layer, C1 obtained by the above method was used.
AMT 100 as an anti-blocking agent
Parts by weight and a lubricant to which 0.06 parts by weight of EA was added were used. As the intermediate layer, one obtained by adding 0.06 parts by weight of EA as a lubricant to C1 was used. As the seal layer, C1 prepared by adding 1.2 parts by weight of AMT100 as an antiblocking agent and 0.08 parts by weight of EBOA as a lubricant was used. The treated layer, the intermediate layer, and the seal layer were treated by using three extruders.
Inflation molding was performed under the same conditions as in Example 1 so as to obtain 17 μm / 17 μm / 16 μm, to obtain a multilayer sealant film. Dry lamination was performed using the multilayer sealant film under the above conditions to obtain a dry laminated film. These sealant films and dry laminate films were evaluated. Table 4 shows the results.

[0121]

Example 3 As a treatment layer, C1 obtained by the above method;
A resin composition containing 90% by weight of PE8 and 10% by weight of PE was added with 0.1 part by weight of AMT100 as an antiblocking agent and 0.06 part by weight of EA as a lubricant. 90% by weight of C1 and PE8; 1 as an intermediate layer
EA as a lubricant in 0.06% by weight of the resin composition
What was added by weight was used. As the seal layer, C1 prepared by adding 1.2 parts by weight of AMT100 as an antiblocking agent and 0.08 parts by weight of EBOA as a lubricant was used. The treated layer, the intermediate layer and the seal layer were treated with three extruders to treat the treated layer / intermediate layer / seal layer = 17 μm /
Inflation molding was performed under the same conditions as in Example 1 so that the thickness became 17 μm / 16 μm, and a multilayer sealant film was obtained. Dry lamination was performed using the multilayer sealant film under the above conditions to obtain a dry laminated film. These sealant films and dry laminate films were evaluated. Table 4 shows the results.

[0122]

Example 4 Molding and evaluation were performed under the same conditions as in Example 2 except that the antiblocking agent of the seal layer in Example 2 was changed to MA1010. Table 4 shows the results.

[0123]

Example 5 Molding and evaluation were performed under the same conditions as in Example 2 except that the antiblocking agent for the seal layer in Example 2 was changed to JC70. Table 4 shows the results.

[0124]

Example 6 Molding and evaluation were performed under the same conditions as in Example 2 except that the resin used for the treatment layer, intermediate layer and seal layer in Example 2 was changed to C2. Table 4 shows the results.

[0125]

Example 7 Molding and evaluation were performed under the same conditions as in Example 2 except that the resin used for the treatment layer, intermediate layer and seal layer in Example 2 was changed to C3. Table 4 shows the results.

[0126]

Example 8 Molding and evaluation were carried out under the same conditions as in Example 3, except that C1 used in the treatment layer, intermediate layer and seal layer of Example 3 was changed to C3. Table 4 shows the results.

[0127]

Comparative Example 1 The resin used for the seal layer of Example 2 was PE
Except having changed to 6, molding and evaluation were performed under the same conditions as in Example 1. Table 5 shows the results.

[0128]

Comparative Example 2 The resin used for the seal layer of Example 2 was PE
Molding was carried out under the same conditions as in Example 1 except that the film was changed to 4, but the bubble was unstable and a film could not be obtained.

[0129]

Comparative Example 3 The resin used for the seal layer of Example 2 was C4
The molding and evaluation were performed under the same conditions as in Example 1 except that the conditions were changed to. Table 5 shows the results.

[0130]

Comparative Example 4 Molding and evaluation were performed under the same conditions as in Example 1 except that the antiblocking agent used in the seal layer of Example 1 was changed to JC30. Table 5 shows the results.

[0131]

[Table 4]

[0132]

[Table 5]

[0133]

According to the present invention, heat blocking properties,
Excellent heat sealability and transparency, high elastic modulus and strong stiffness. Therefore, even when stored for a long period of time, such as in summer, there is no blocking, and the opening property at the time of bag making is good, and the workability such as the work of filling the contents is excellent. Therefore, it can be suitably used as a sealant film of a packaging material for bag making in the field of food packaging, the field of medical care, and the like.

[Brief description of the drawings]

FIG. 1 shows a TREF elution curve for two peaks.

FIG. 2 shows a TREF elution curve for three peaks. FIG. 2A shows a case where a peak having a lower peak height than the elution peak of the low crystalline component exists in a temperature region lower than the elution temperature of the elution peak of the low crystalline component. FIG. 2 (b)
Represents a case where a peak having a lower peak height than the elution peak of the low crystalline component exists between the elution peak of the high crystalline component and the elution peak of the low crystalline component.

[Explanation of symbols]

 1 ... elution peak of high crystalline component 2 ... elution peak of low crystalline component

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 4F071 AA15 AA16 AA18 AA88 AA89 AC12 AE11 AF05 AH19 BB09 BC01 BC02 4F100 AH03A AH03B AH03C AH03H AK04A AK04B AK04C AK05A AK06C AK63A10BA03A05 BA05B GB15 GB23 GB66 JA06A JA11A JJ03 JK07 JL00 JL08A JL12 JL12A JN01 YY00A YY00B

Claims (8)

[Claims] 1. A sealant film including a seal layer, wherein the seal layer contains a low crystalline component and a high crystalline component and satisfies all of the following physical properties (a) to (d): It is characterized by being formed of a polyethylene resin material (A) obtained by mixing 0.01 to 0.25 parts by weight of an amide lubricant and 0.5 to 5 parts by weight of an antiblocking agent with respect to parts by weight. Do, sealant film. (A) The elution peak temperature of the low crystalline component in the TREF elution curve is 50 to 92 ° C. (b) The peak height of the low crystalline component is H, and the minimum valley between the peak of the low crystalline component and the peak of the high crystalline component The value of H / M is 9 or more, where M is the height. (C) The ratio of the area below the elution peak temperature of the low crystalline component to the entire area of TREF is 35% or more. (D) MFR is 0.1 to 20 g / 10 minutes 2. A resin comprising 98 to 55% by weight of an ethylene / α-olefin copolymer obtained by polymerizing the ethylene-based polymer in the presence of a metallocene catalyst and 2-45% by weight of a high-density polyethylene. The sealant film according to claim 1, which is a mixture. 3. The sealant film according to claim 1, wherein the amide lubricant compounded in the polyethylene resin material (A) is an unsaturated fatty acid bisamide compound. 4. The sealant film according to claim 1, wherein the film is formed by inflation molding. 5. The film according to claim 1, wherein the film is a multilayer sealant film including a seal layer and a treated layer, wherein the treated layer is an amide-based film based on 100 parts by weight of the polyethylene-based resin containing the ethylene-based polymer as a main component. 5. A polyethylene resin material (B) comprising 0.01 to 0.2 parts by weight of a lubricant and 0.05 to 2 parts by weight of an antiblocking agent. The sealant film according to any one of the above. 6. The amide lubricant compounded in the polyethylene resin material (B) is a monoamide compound of a saturated fatty acid or an unsaturated fatty acid.
The sealant film as described. 7. The multi-layer sealant film according to claim 1, wherein the film is a multilayer sealant film including a seal layer, a treatment layer, and an intermediate layer provided between the seal layer and the treatment layer. The sealant film according to claim 5, wherein the sealant film is formed of a polyethylene resin material (C) obtained by blending a polyethylene resin as a component and an amide lubricant. 8. The polyethylene resin of the treatment layer and / or the intermediate layer contains 75 to 97% by weight of the ethylene polymer.
The sealant film according to any one of claims 5 to 7, which is a resin mixture of a high-pressure method low-density polyethylene and 3 to 25% by weight.