JP4675064B2 - Resin composition and laminate - Google Patents

Description

  The present invention relates to a resin composition suitable as an adhesive layer for forming a laminate having good non-charging properties and interlayer adhesion, and a laminate using the resin composition.

  Polyolefin resins such as polyethylene and polypropylene, and thermoplastic resins such as polyester, polyamide, ethylene / vinyl alcohol copolymer, and polyvinyl alcohol are widely used as film materials. In applications where various functions are required, it is widely used as a laminated film having two or more kinds of layer structures in order to make use of the respective characteristics of these thermoplastic resins. In such a laminated film as well as a general single layer film, in order to avoid dust and other electrostatic adhesion troubles associated with charging, it is required to have good non-charging properties. It is also required that the layered structure to be formed has good interlayer adhesion. For this reason, although an adhesive layer is often provided, it is usually provided separately from the non-charged layer.

  A polyolefin resin modified with an unsaturated carboxylic acid or an anhydride thereof is widely known as a resin that can be used for such an adhesive layer, and can be coextruded with a thermoplastic resin constituting a base film. have. It is advantageous if an antistatic agent can be added to the adhesive layer to prevent antistatic on the surface of the laminate. However, when an ordinary antistatic agent is added to the polyolefin resin modified with the unsaturated carboxylic acid or the like, it becomes difficult to co-extrusion with the resin for the base film, and, for example, it becomes impossible to mold in the formation of a multilayer inflation film. was there.

  Accordingly, the object of the present invention is to impart non-chargeability to the polyolefin resin modified with an unsaturated carboxylic acid or its anhydride without imparting non-chargeability, and to allow co-extrusion with a base film resin. Is to provide a simple resin composition. Another object of the present invention is to provide a laminate excellent in non-chargeability and interlayer adhesion using such a resin composition as an adhesive layer.

That is, according to the present invention, 95 to 60% by mass of a polyolefin resin (A) modified with an unsaturated carboxylic acid or its anhydride and 5 to 40% by mass of a potassium ionomer (B) of an ethylene / unsaturated carboxylic acid copolymer. The resin composition used for the adhesive layer of the laminated body which consists of this is provided.

  According to the present invention, there is also provided a laminate comprising a thermoplastic resin layer provided on both sides of an adhesive comprising the resin composition and a layer comprising the resin composition.

  ADVANTAGE OF THE INVENTION According to this invention, the resin composition excellent in the non-charge property and adhesiveness useful as an adhesive layer of a laminated body, especially a laminated | multilayer film can be provided. A laminate in which a thermoplastic resin is disposed on both sides of such a resin composition layer can be produced by coextrusion, and is excellent in interlayer adhesion and non-charging properties. Such a laminate has excellent resistance to delamination and can impart excellent charge attenuation to at least one surface layer, and can prevent adhesion of dust and powder due to charging. Therefore, it can be used in the form of not only films but also tapes, sheets, tubes, tubes, bags, multilayer containers (for example, containers by blow molding), rods, various injection molded products, various blow molded products, and the like. In this case, the molded product having the surface layer having the above-described attenuation characteristics on the outer surface is excellent in antifouling property, and surface contamination can be avoided. Also, in a method of use in which the surface layer having the above-mentioned damping characteristics becomes an inner surface layer when used as a powder material packaging material, there is no electrostatic adhesion of the powder to the packaging material, and the commercial value is not impaired. .

  In addition to packaging materials, such laminates include electrical and electronic materials such as adhesive tapes or films for semiconductors such as dicing tape substrates and back grind films, marking films, IC carrier tapes, electronic component taping tapes, and foods. Packaging material, hygiene material, protective film (eg glass, plastic or metal board, lens guard film or tape), steel wire coating material, clean room curtain, wallpaper, mat, flooring, flexible container bag, container, shoes, It can be used in applications such as battery separators, moisture permeable films, antifouling films, dustproof films, PVC substitute films, various cosmetics, detergents, shampoos, rinses, tubes and bottles.

  A polyolefin resin modified with an unsaturated carboxylic acid or an anhydride thereof (hereinafter sometimes referred to as a modified polyolefin resin) (A) used in the resin composition of the present invention is generally an unsaturated carboxylic acid in a polyolefin resin. Alternatively, it is a resin obtained by graft-modifying or copolymer-modifying its anhydride. Such modified polyolefin resins are commercially available as adhesive resins under various other general names such as acid-modified polyolefin and carboxylic acid-modified polyolefin. For example, Admer (Mitsui Chemicals), Modic (Mitsubishi Chemical) ), Mersen (manufactured by Tosoh Corporation), polybond (manufactured by Uniroyal Chemical Co., Ltd.), etc., and can be obtained in the market.

  Examples of polyolefin resins that can be used as the base polymer of the modified polyolefin resin (A) include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 4-methyl- Α-olefin homopolymers such as 1-pentene, two or more random copolymers, two or more block copolymers, a copolymer of ethylene and vinyl acetate, ethylene and (meth) acrylic acid It is a polymer selected from ethylene / polar monomer copolymers such as a copolymer with ethyl.

  More specifically, examples of the polyolefin resin include high-density polyethylene, medium-density polyethylene, high-pressure low-density polyethylene, linear low-density polyethylene (a copolymer of ethylene and an α-olefin having 3 or more carbon atoms), polypropylene (single) Polymer, random polymer, block copolymer, etc.), poly-1-butene, poly-4-methyl-1-pentene, and the like. These may be produced by any catalyst system. For example, in the above-mentioned linear low density polyethylene, those produced by a metallocene catalyst or a multisite catalyst can be used. Among these, polyethylene has a melt flow rate at 190 ° C. and a load of 2160 g of 0.1 to 1000 g / 10 minutes, preferably about 0.2 to 500 g / 10 minutes, and polypropylene has a melt flow rate of 230 ° C. A melt flow rate at a load of 2160 g is preferably about 0.1 to 1000 g / 10 min, particularly about 0.2 to 500 g / 10 min.

  The modified polyolefin resin (A) can be obtained by grafting an unsaturated carboxylic acid to the polyolefin resin as described above, which is a base polymer, or by copolymerizing an olefin and a small amount of an unsaturated carboxylic acid. Examples of unsaturated carboxylic acids or anhydrides used for grafting or copolymerization modification include acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, itaconic anhydride, norbornene-2,3-dicarboxylic anhydride, and the like. However, acid anhydrides are particularly preferred, and maleic anhydride is particularly preferred. A suitable grafting amount of the unsaturated carboxylic acid or its anhydride is 0.01 to 10% by mass, preferably 0.01 to 7% by mass, particularly preferably 0.05 to 3% by mass. In the present invention, the modified polyolefin resin (A) is particularly preferably a graft-modified polyolefin resin. This graft-modified polyolefin resin is prepared by dissolving the organic polymer in an appropriate solvent under the melting conditions of the base polymer or by dissolving or suspending the base polymer in an appropriate solvent. It can be obtained by grafting the unsaturated carboxylic acid or its anhydride in the presence of a radical initiator such as a peroxide.

  Examples of the organic peroxide that can be used for the grafting reaction include t-butyl peroxyisopropyl carbonate, t-butyl peroxyacetate, t-butyl peroxybenzoate, dicumyl peroxide, 2,5-dimethyl-2,5- Bis (t-butylperoxy) hexane, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3, di-t-butyl peroxide, 1,1-bis (t-butylper) Oxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, methyl ethyl ketone peroxide, 2,5-dimethylhexyl-2,5-bisperoxybenzoate, t-butylper Oxide, p-menthane peroxide, t-butylperoxybenzoate, cumene high B peroxide, cyclohexanone peroxide, t- butyl cumyl peroxide, 1,3-bis etc. can be used (2-t-butyl peroxy isopropyl) benzene. These organic peroxides are used at a ratio of, for example, about 0.1 to 2% by mass with respect to the base polymer.

  The melt flow rate of the acid-modified polyolefin resin (A) thus obtained is almost the same as or slightly lower than that of the base polymer.

  In the resin composition of the present invention, an ethylene / unsaturated carboxylic acid copolymer potassium ionomer (B) is used together with the modified polyolefin resin (A). The ethylene / unsaturated carboxylic acid copolymer used as the base polymer of the potassium ionomer is obtained by copolymerizing ethylene, an unsaturated carboxylic acid, and optionally another polar monomer.

  Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, monomethyl maleate, monoethyl maleate and the like, and acrylic acid or methacrylic acid is particularly preferable. Other polar monomers that can be copolymer components include vinyl esters such as vinyl acetate and vinyl propionate, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, and n-acrylate. -Unsaturated carboxylic acid esters such as hexyl, isooctyl acrylate, methyl methacrylate, ethyl methacrylate, dimethyl maleate, diethyl maleate, carbon monoxide, etc., especially unsaturated carboxylic acid esters are suitable copolymerization components It is.

  Such an ethylene / unsaturated carboxylic acid copolymer can be obtained by radical copolymerization of ethylene and an unsaturated carboxylic acid and optionally another polar monomer at high temperature and high pressure.

  As the potassium ionomer (B), if an ethylene / unsaturated carboxylic acid copolymer serving as a base polymer has too little acid content or too little neutralization degree, a resin composition having excellent non-charging properties can be obtained. I can't get it. Therefore, the degree of neutralization with potassium ions of an ethylene / unsaturated carboxylic acid copolymer having an unsaturated carboxylic acid content of 10 to 30% by mass, preferably 10 to 25% by mass, is 60% or more, preferably 70% or more. It is preferable to use one or more ionomers. When two or more ethylene / unsaturated carboxylic acid copolymers are used as the base polymer, as long as the average unsaturated carboxylic acid content is within the above range, the unsaturated carboxylic acid content is partly included. A copolymer of less than 10% by weight may be used. In the present invention, potassium ionomers of two or more kinds of ethylene / unsaturated carboxylic acid copolymers having different average acid contents are desirable in order to obtain a resin composition excellent in non-charging property. For example, two or more kinds of copolymers having an average acid content of 10 to 30% by mass, preferably 10 to 20% by mass, wherein the difference in acid content between the highest acid content and the lowest acid content is 1% by mass or more, Preferably, it is a mixed ionomer in which the degree of neutralization of the ethylene / unsaturated carboxylic acid copolymer different from 2 to 20% by mass with potassium ions is 60% or more, preferably 70% or more. More specifically, the unsaturated carboxylic acid content is 1 to 10% by mass, preferably 2 to 10% by mass, 190 ° C., melt flow rate at 2160 g load is 1 to 600 g / 10 min, preferably 10 to 500 g / 10. Minute ethylene / unsaturated carboxylic acid copolymer (b-1) and unsaturated carboxylic acid content of 11 to 25% by mass, preferably 13 to 23% by mass, 190 ° C., melt flow rate at 2160 g load of 1 to 1 It consists of an ethylene / unsaturated carboxylic acid copolymer (b-2) of 600 g / 10 minutes, preferably 10 to 500 g / 10 minutes, and has an average unsaturated carboxylic acid content of 10 to 20% by mass, preferably 11 to 15%. % By mass, 190 ° C., average melt flow rate at 2160 g load is 1 to 300 g / 10 min, preferably 10 to 200 g / 10 min, more preferably Mixed ionomers having the degree of neutralization of the mixed copolymer components 0~150g / 10 min are particularly preferred. As the mixed copolymer component, the mixing ratio of the copolymer (b-1) and the copolymer (b-2) is 2 to 60 parts by mass, preferably 5 to 50 parts by mass with respect to the latter. It is preferable to set it as 98-40 mass parts, Preferably it is 95-50 mass parts. The above-mentioned ethylene / unsaturated carboxylic acid copolymer which is the base polymer of potassium ionomer is copolymerized with other polar monomers as described above in a proportion of 40% by mass or less, preferably 30% by mass or less. It may be.

  As the potassium ionomer (B), considering processability and miscibility with the modified polyolefin resin (A), the melt flow rate at 190 ° C. under a load of 2160 g is 0.1 to 100 g / 10 min, particularly preferably 0.1. It is preferable to use the one of 2 to 50 g / 10 minutes.

  In the resin composition of the present invention, considering the balance between non-charging property and adhesiveness, 5 to 60% by mass of the modified polyolefin resin (A), preferably 90 to 70% by mass, and 5% of potassium ionomer (B). -40 mass%, Preferably it is mix | blended in the ratio of 10-30 mass% (both 100 mass%).

  In such a resin composition, other polymers and additives can be arbitrarily blended as long as the object of the present invention is not impaired. Such a polymer or additive can be blended in advance in one or both of (A) and (B), or can be added during the melt mixing process of both components (A) and (B). it can. Or it can mix | blend, after preparing the resin composition which consists of (A) and (B). For example, in order to improve the processability of potassium ionomer (B), miscibility with component (A), and other properties, potassium ionomer (B) should be preliminarily mixed with ethylene (meth) acrylic acid ester having an equivalent mass or less. A coalescence can be blended.

  In order to improve non-chargeability, a polyhydroxy compound having two or more alcoholic hydroxyl groups can be blended in advance with the potassium ionomer (B). Specifically, polyethylene glycol of various molecular weights, polypropylene glycol, polyoxyalkylene glycols such as polyoxyethylene / polyoxypropylene glycol, polyhydric alcohols such as glycerin, hexanetriol, pentaerythritol, sorbitol, and ethylene oxide adducts thereof, Examples include adducts of polyvalent amines and alkylene oxides. The effective blending ratio of the polyhydroxy compound is 15% by mass or less, preferably 10% by mass or less, more preferably less than 5% by mass, and most preferably less than 0.1% by mass with respect to the potassium ionomer.

  Examples of additives that can be optionally added include antioxidants, heat stabilizers, light stabilizers, UV absorbers, colorants, lubricants, antiblocking agents, flame retardants, flame retardant aids, and foaming agents. , Foaming aids, inorganic fillers, fiber reinforcements and the like.

  The resin composition of the present invention can be used for bonding various substrates as an adhesive that can be melt-extruded. For example, it can be used for adhesion of a single-layer or multilayer substrate such as various thermoplastic resins, paper, wood, metal, woven fabric, and non-woven fabric.

Examples of the thermoplastic resin that can be used as the base material include ethylene homopolymers or copolymers of ethylene and α-olefins having 3 to 12 carbon atoms, such as high-pressure polyethylene, medium / high-density polyethylene, linear Low density polyethylene, especially linear low density polyethylene having a density of 940 kg / m ³ or less, ultra low density polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene and polar monomers Copolymers such as ethylene / vinyl acetate copolymers, copolymers of ethylene and unsaturated carboxylic acids such as acrylic acid, methacrylic acid, monoethyl maleate, maleic anhydride, etc., or Na, Li, Zn, Mg or Ionomers such as Ca, ethylene and one or more unsaturated carboxylic acid esters such as Copolymers of methyl acrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, glycidyl methacrylate, dimethyl maleate, etc., ethylene and unsaturated as described above Copolymer of carboxylic acid and unsaturated carboxylic acid ester or its ionomer such as Na, Li, Zn, Mg or Ca, copolymer of ethylene and carbon monoxide and optionally unsaturated carboxylic acid ester or vinyl acetate, polyolefin Olefin polymers such as elastomers, styrene polymers such as polystyrene, high impact polystyrene and rubber reinforced styrene resins such as ABS resin, polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, polyethylene Examples include naphthalate, cyclohexanedimethanol copolymerized polyethylene terephthalate, polyester such as polyester elastomer, polycarbonate, polymethyl methacrylate, ethylene / vinyl alcohol copolymer, polyvinyl alcohol, polyamide resin, or a mixture of two or more of these. .

  In particular, a laminate excellent in interlayer adhesion can be obtained with good quality stability by coextrusion with a polyolefin resin. Therefore, a three-layer coextrusion molded product in which a polyolefin resin is arranged on both sides of the resin composition of the present invention, or the above-mentioned The resin composition of the present invention can be suitably used for the production of a coextruded laminate molded product that is coextruded and laminated with a polyolefin resin on an arbitrary base material.

  Suitable polyolefin resins include polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, and the like. Among these, it is preferable to use polyethylene, particularly high-pressure method low-density polyethylene or linear low-density polyethylene, or polypropylene.

The linear low density polyethylene is a copolymer of ethylene and an α-olefin having 3 or more carbon atoms, preferably 3 to 12, and having a density of 900 to 940 kg / m ³ , preferably 900 to 930 kg / m ³ . Is. These are metallocene catalysts such as a combination catalyst of a metallocene catalyst component and an organoaluminum oxy compound catalyst component comprising a zirconium compound having a ligand having a cyclopentadienyl skeleton, or a highly active titanium catalyst component and an organoaluminum compound catalyst. In the presence of a multi-site catalyst such as a combination catalyst of components, ethylene and an α-olefin having 3 or more carbon atoms such as propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1 -It can be produced by copolymerizing dodecene, 4-methyl-1-pentene and the like. As the linear low density polyethylene, in consideration of mechanical strength and workability, a melt flow rate at 190 ° C. under a load of 2160 g is 0.1 to 100 g / 10 minutes, particularly 0.2 to 50 g / 10 minutes. It is preferable to do.

Polypropylene suitable as the polyolefin resin is a homopolymer of propylene or a propylene / α-olefin copolymer. The propylene / α-olefin copolymer is a copolymer of propylene mainly composed of propylene and other α-olefin, and has a density of 870 to 930 kg / m ³ , particularly 880 to 920 kg / m ³ . preferable. The α-olefin copolymerized with propylene is preferably one having 2 to 12 carbon atoms, particularly 2 to 10 carbon atoms, and specifically, ethylene, 1-butene, 1-hexene, 1-octene, 1-octene, One type or two or more types such as decene, 1-dodecene, 4-methyl-1-pentene can be exemplified. The propylene copolymer may be a random copolymer or a block copolymer, and in particular, propylene and ethylene having a propylene content of 85 to 99.9% by mass, preferably 90 to 99.5% by mass. A random copolymer or a random copolymer composed of propylene, ethylene and another α-olefin is preferred.

  In view of moldability, mechanical strength, etc., polypropylene preferably has a melt flow rate of 0.1 to 100 g / 10 min, particularly 0.2 to 80 g / 10 min at 230 ° C. and 2160 g load.

  The total layer thickness of the laminate in which the thermoplastic resin layer is provided on both sides of the layer made of the resin composition of the present invention is arbitrary, but for example, 10 to 3000 μm, particularly about 20 to 1000 μm. Is good. In such a laminated body, at least one surface layer has a 10% decay time (time to decay to +500 V) at an applied voltage of +5000 V measured in an atmosphere of 23 ° C. and 50% relative humidity, preferably 20 seconds or less. Is preferably 10 seconds or less, more preferably 1 second or less. For that purpose, it is preferable that the thickness of the resin composition layer of the present invention is 5 μm or more, preferably 10 μm or more, and the thickness on the surface layer side having the above-mentioned attenuation characteristics is 500 μm or less, particularly 300 μm or less. In consideration of practical performance, the ratio of the thickness of the surface layer to the thickness of the resin composition layer of the present invention is preferably in the range of 0.1 to 100, particularly 0.5 to 30.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In the following Examples and Comparative Examples, the raw materials used and methods for evaluating the non-charging performance of the obtained laminate are shown below.

1. Raw materials used (1) Unsaturated carboxylic acid-modified polyolefin resin (a) Adhesive polyolefin Admer QF500: manufactured by Mitsui Chemicals, PP base, melt flow rate (MFR) (230 ° C., 2160 g load) 3.0 g / 10 min (B) Adhesive polyolefin admer NF518: made by Mitsui Chemicals, LLDPE base, MFR (190 ° C., 2160 g load) 2.4 g / 10 min (c) Adhesive polyolefin admer SF731: made by Mitsui Chemicals, special Polyolefin base, MFR (190 ° C, 2160 g load) 2.6 g / 10 min

(2) Non-chargeable resin (a) Potassium ionomer mixture (KIO-1): Ethylene / methacrylic acid copolymer (methacrylic acid content 20% by mass, MFR (190 ° C., 2160 g load) 60 g / 10 min) 45% by mass , Ethylene / methacrylic acid copolymer (methacrylic acid content 15 mass%, MFR (190 ° C., 2160 g load) 60 g / 10 min) 27 mass%, ethylene / methacrylic acid copolymer (methacrylic acid content 10 mass%, MFR ( 190 ° C., 2160 g load) 35 g / 10 min) 18% by mass and ethylene / methyl acrylate copolymer (methyl acrylate content 9% by mass, MFR (190 ° C., 2160 g load) 8 g / 10 min) 10% by mass M obtained by neutralizing the carboxyl group of the ethylene / methacrylic acid copolymer in the mixture with potassium ions by 85%, M FR (190 ° C., 2160 g load) 0.3 g / 10 min (b) Potassium ionomer mixture (KIO-2): ethylene / methacrylic acid copolymer (methacrylic acid content 15 mass%, MFR (190 ° C., 2160 g load) 60 g / 10 min) 50% by mass and ethylene / methacrylic acid copolymer (methacrylic acid content 10% by mass, MFR (190 ° C., 2160 g load) 100 g / 10 min) % Neutralized and 9% by weight of glycerin, MFR (190 ° C., 2160 g load) 5.5 g / 10 minutes (C) Irgastat P16: polyether ester amide, manufactured by Ciba Specialty Chemicals Co., Ltd.

(3) Polyolefin resin (a) Polyethylene (mPE) produced using a metallocene catalyst: Evolve SP2520 manufactured by Mitsui Chemicals, density 925 kg / m ³ , MFR (190 ° C., 2160 g load) 1.9 g / 10 min (B) Polypropylene (PP): PP F232DC manufactured by Mitsui Chemicals, propylene / ethylene random copolymer, MFR (230 ° C., 2160 g load) 2.0 g / 10 min

2. Physical property test method (1) Evaluation of non-charging property (a) 10% decay time The three-layer film obtained in the following examples was allowed to stand in an atmosphere of 23 ° C. and 50% relative humidity for 7 days, and Static Decay Meter Model 4060 manufactured by ETS USA. The time for decaying from the applied voltage + 5000V to + 500V was measured as 10% decay time.

(2) Cutlet adhesion test method The three-layer film obtained in the following example is left in an atmosphere of 23 ° C. and 50% relative humidity for 24 hours, immediately after being reciprocated 20 times by rubbing and brought close to the adherend (cuttlefish). The state of adhesion was observed.
○: Even if the adherend and the film are in direct contact, they do not adhere. Δ: When the adherend and the film are in direct contact, they adhere slightly. ×: When the adherend and the film are brought close to each other, the distance is 5 cm or more. Adhere to

(2) Interlayer adhesion evaluation The three-layer film obtained in the examples described later was evaluated by the peeled state when the inner layer was peeled 180 ° after complete fusion between the inner layers.
◎: Interlayer adhesion is strong and cannot be peeled ○: Equipment is destroyed at the seal part △: Interlayer peeling is weak ×: Interfacial peeling occurs between layers

[Example 1]
Using a multilayer inflation film forming apparatus equipped with a three-layer inflation die, the PP is passed through an outer layer extruder (40 mmφ, screw rotation speed 25 rpm) to the outer layer of the die, and an intermediate layer extruder (40 mmφ, Through a screw rotation speed of 13 rpm, 80 parts by mass of the modified polyolefin resin Admer NF518 and 20 parts by mass of the potassium ionomer mixture (KIO-1) are mixed, and an inner layer extruder (40 mmφ, screw rotation speed of 25 rpm) is used as the inner layer. The above mPE was supplied at 200 ° C. and bonded inside the die to obtain a three-layer inflation film having an outer layer of 20 μm, an intermediate layer of 10 μm, and an inner layer of 20 μm. The evaluation results are shown in Table 1.

[Example 2]
In Example 1, a three-layer inflation film was obtained in the same manner as in Example 1 except that the potassium ionomer mixture (KIO-2) was used instead of the potassium ionomer mixture (KIO-1) used in the intermediate layer. The evaluation results are shown in Table 1.

[Example 3]
A three-layer inflation film was obtained in the same manner as in Example 1 except that Admer QF500 was used instead of Admer NF518 as the modified polyolefin resin used in the intermediate layer. The evaluation results are shown in Table 1.

[Example 4]
In Example 2, a three-layer inflation film was obtained in the same manner as in Example 2 except that Admer QF500 was used instead of Admer NF518 as the modified polyolefin resin used in the intermediate layer. The evaluation results are shown in Table 1.

[Example 5]
In Example 2, a three-layer inflation film was obtained in the same manner as in Example 2 except that Admer SF731 was used instead of Admer NF518 as the modified polyolefin resin used in the intermediate layer. The evaluation results are shown in Table 1.

[Comparative Example 1]
In Example 3, a three-layer inflation film was obtained in the same manner as in Example 1 except that Irgastat P16 was used instead of the potassium ionomer mixture (KIO-1) used in the intermediate layer. The evaluation results are shown in Table 1.

[Comparative Example 2]
In Example 3, a three-layer inflation film was obtained in the same manner as in Example 1 except that Admer QF500 was used instead of the potassium ionomer mixture (KIO-1) used in the intermediate layer. The evaluation results are shown in Table 1.

Claims (10)

Adhesive layer of laminate comprising 95-60% by mass of polyolefin resin (A) modified with unsaturated carboxylic acid or its anhydride and 5-40% by mass of potassium ionomer (B) of ethylene / unsaturated carboxylic acid copolymer Resin composition used for Adhesive layer of laminate comprising 90 to 70% by mass of polyolefin resin (A) modified with unsaturated carboxylic acid or its anhydride and 10 to 30% by mass of potassium ionomer (B) of ethylene / unsaturated carboxylic acid copolymer Resin composition used for The adhesive layer of the laminate according to claim 1 or 2, wherein the polyolefin resin (A) modified with an unsaturated carboxylic acid or an anhydride thereof is a polyolefin resin graft-modified with an unsaturated carboxylic acid or an anhydride thereof. the resin composition used. Potassium ionomer (B) is, according to any of claims 1 to 3 neutralization degree of unsaturated carboxylic acid content of 10 to 30 wt% ethylene-unsaturated carboxylic acid copolymer is of 60% The resin composition used for the adhesive layer of the laminate . The potassium ionomer (B) is a potassium ionomer of two or more ethylene / unsaturated carboxylic acid copolymers having different acid contents, and the average acid content of the ethylene / unsaturated carboxylic acid copolymer is 10 to 20 mass. The acid content difference between the highest acid content and the lowest acid content is 2 to 20% by mass, and the degree of neutralization with potassium ions is 60% or more. The resin composition used for the contact bonding layer of the laminated body in any one of 3. The resin composition used for the adhesive layer of the laminate according to any one of claims 1 to 5, wherein 15% by mass or less of a polyhydroxy compound is blended with the potassium ionomer (B). An adhesive comprising the resin composition according to any one of claims 1 to 6. The laminated body which provides a thermoplastic resin layer on both sides of the layer which consists of a resin composition in any one of Claims 1-6. The laminate according to claim 8 , wherein both of the thermoplastic resin layers are polyolefin resin layers. The laminate according to claim 9 , wherein one polyolefin resin layer is a polypropylene layer, and the other polyolefin resin layer is an ethylene polymer layer obtained by polymerization with a metallocene catalyst.