WO2019208169A1 - 接着性樹脂組成物および積層体 - Google Patents
接着性樹脂組成物および積層体 Download PDFInfo
- Publication number
- WO2019208169A1 WO2019208169A1 PCT/JP2019/015117 JP2019015117W WO2019208169A1 WO 2019208169 A1 WO2019208169 A1 WO 2019208169A1 JP 2019015117 W JP2019015117 W JP 2019015117W WO 2019208169 A1 WO2019208169 A1 WO 2019208169A1
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- Prior art keywords
- layer
- ethylene
- ethylene polymer
- polymer
- mass
- Prior art date
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
- B32B2439/46—Bags
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
Definitions
- the present invention relates to an adhesive resin composition and a laminate, and more particularly, an adhesive resin composition having high adhesion to a gas barrier resin, and a laminate having high barrier properties, including a layer containing the adhesive resin composition. About the body.
- Polyethylene is widely used as packaging and containers for various foods and chemicals because it is excellent in transparency, flexibility, hygiene, processability, etc. and is inexpensive. Polyethylene cannot be used alone as a packaging or container because of its high gas permeability. For this reason, polyethylene and other materials having high gas barrier properties, for example, gas barrier resins such as polyamide and ethylene / vinyl alcohol copolymer are often laminated and used as packaging or containers. In addition, since polyethylene is a nonpolar material and has almost no adhesive force, various improvements have been made in laminating polyethylene to gas barrier resins.
- Patent Document 1 includes a layer of a polyethylene resin composition containing an ethylene polymer and a modified ethylene polymer and a layer of a saponified ethylene / vinyl acetate copolymer, polyamide, polyester, or the like. A laminated body is disclosed. Patent Document 1 describes that the resin composition has excellent adhesiveness to other resins, and the adhesiveness is not deteriorated by heat, water, salt water, or the like.
- ethylene-vinyl alcohol copolymer which is a gas barrier resin
- an additive styrene elastomer, etc.
- Measures have been taken (Patent Documents 2 and 3).
- the additive inhibits the adhesion with polyethylene, the number of cases in which the adhesive force between polyethylene and the gas barrier resin is insufficient with the conventional adhesive resin is increasing.
- An object of the present invention is to provide an adhesive resin excellent in adhesive strength with a gas barrier resin such as an ethylene / vinyl alcohol copolymer.
- the present invention that achieves the above object is the following [1] to [9].
- An adhesive comprising an ethylene polymer (A) including an ethylene polymer graft-modified with an unsaturated carboxylic acid or a derivative thereof, and satisfying the following requirements (1) to (4) Resin composition.
- MFR melt flow rate
- the density is 910 to 930 kg / m 3 .
- the ratio of the eluted components at 50 ° C. or less is 20% by mass or more.
- the ethylene polymer (A) is composed of the following ethylene polymer (A1) 20 to 40% by mass and ethylene polymer (A2) 60 to 80% by mass [provided that the ethylene polymer ( The total of A1) and the ethylene polymer (A2) is 100% by mass], and at least one of the ethylene polymer (A1) and the ethylene polymer (A2) is an unsaturated carboxylic acid
- the adhesive resin composition according to [1] comprising an ethylene polymer graft-modified with a derivative thereof.
- (A1) An ethylene polymer having a density of 930 to 965 kg / m 3 and a melt flow rate (MFR) at a temperature of 190 ° C. and a load of 2160 g, measured according to ASTM D 1238, of 0.1 to 10 g / 10 min. .
- (A2) An ethylene polymer having a density of 858 to 929 kg / m 3 and a melt flow rate (MFR) at a temperature of 190 ° C. and a load of 2160 g, measured according to ASTM D 1238, of 0.1 to 10 g / 10 min. .
- a layer (I) containing an ethylene polymer, an adhesive layer (II) containing the adhesive resin composition according to [1] or [2], and a layer containing an ethylene / vinyl alcohol copolymer ( III) and / or a layer (IV) containing a polyamide resin is laminated, and the layer (II) is in direct contact with at least one of the layer (III) and the layer (IV).
- Laminated body [4]
- the above-mentioned ethylene / vinyl alcohol copolymer is a polymer obtained by saponifying an ethylene / vinyl acetate copolymer having a content of structural units derived from ethylene of 20 to 30 mol%. The laminated body of description.
- the adhesive resin composition of the present invention has an excellent adhesive force with respect to a gas barrier resin such as an ethylene / vinyl alcohol copolymer. For this reason, in the laminate including the adhesive layer containing the adhesive resin composition and the gas barrier resin layer in direct contact with the adhesive layer, an additive is added to the gas barrier resin layer for softening. Even in such a case, since the two layers are firmly bonded, separation between the two layers hardly occurs. Therefore, the laminate can be effectively used as a packaging and container having high barrier properties.
- a gas barrier resin such as an ethylene / vinyl alcohol copolymer
- the adhesive resin composition of the present invention contains an ethylene polymer (A) including an ethylene polymer graft-modified with an unsaturated carboxylic acid or a derivative thereof.
- the ethylene polymer (A) contains the following ethylene polymer (A1) and ethylene polymer (A2), and the ethylene polymer (A At least one of A1) and (A2) includes an ethylene polymer graft-modified with an unsaturated carboxylic acid or a derivative thereof.
- A1 An ethylene polymer having a density of 930 to 965 kg / m 3 and a melt flow rate (MFR) at a temperature of 190 ° C. and a load of 2160 g, measured according to ASTM D 1238, of 0.1 to 10 g / 10 min. .
- A2 An ethylene polymer having a density of 858 to 929 kg / m 3 and a melt flow rate (MFR) at a temperature of 190 ° C. and a load of 2160 g, measured according to ASTM D 1238, of 0.1 to 10 g / 10 min. .
- the ethylene polymer (A1) has a density of 930 to 965 kg / m 3 , preferably 940 to 965 kg / m 3 .
- a density of 930 to 965 kg / m 3 preferably 940 to 965 kg / m 3 .
- the ethylene-based polymer (A1) has a melt flow rate (MFR) at 190 ° C. and a load of 2160 g as measured based on ASTM D 1238 of 0.1 to 10 g / 10 min, preferably 0.2 to 8 g / 10. Minutes.
- MFR melt flow rate
- the polymer having an MFR of less than 0.1 g / 10 min may make it difficult to extrude the resulting adhesive resin composition, and the pressure may increase and exceed the limit pressure of the molding machine.
- a polymer having an MFR of more than 10 g / 10 min tends to cause poor uniformity in the thickness of the molded product when the resulting adhesive resin composition is molded, and the molecular weight is too low. There is a possibility that the impact strength and the like of the resin may be reduced.
- Ethylene polymer (A2) is a density of 858 ⁇ 929kg / m 3, preferably 865 ⁇ 925kg / m 3.
- the ethylene polymer (A2) having a density in such a range an adhesive resin composition having excellent adhesiveness can be easily obtained.
- the ethylene-based polymer (A2) has a melt flow rate (MFR) at 190 ° C. under a load of 2160 g, measured according to ASTM D 1238, of 0.1 to 10 g / 10 minutes, preferably 0.5 to 7 g / 10. Minutes.
- MFR melt flow rate
- the polymer having an MFR of less than 0.1 g / 10 min may make it difficult to extrude the resulting adhesive resin composition, and the pressure may increase and exceed the limit pressure of the molding machine.
- a polymer having an MFR of more than 10 g / 10 min tends to cause poor uniformity in the thickness of the molded product when the resulting adhesive resin composition is molded, and the molecular weight is too low. There is a possibility that the impact strength and the like of the resin may be reduced.
- At least one of the ethylene polymers (A1) and (A2) includes an ethylene polymer graft-modified with an unsaturated carboxylic acid or a derivative thereof. That is, the ethylene polymer (A1) contains a modified ethylene polymer, the ethylene polymer (A2) does not contain a modified ethylene polymer, and the ethylene polymer (A1) contains a modified ethylene polymer. And an embodiment in which the ethylene polymer (A2) contains a modified ethylene polymer, and an embodiment in which both the ethylene polymer (A1) and the ethylene polymer (A2) contain a modified ethylene polymer.
- the graft amount of the unsaturated carboxylic acid or derivative thereof in each of the ethylene polymers (A1) and (A2) is usually 0. The range is 0.01 to 10% by mass, preferably 0.02 to 5% by mass. If the graft amount is lower than 0.01% by mass, the adhesive force may not be sufficient. If it is higher than 10% by mass, a crosslinking reaction tends to occur, and the quality of the resulting modified ethylene polymer is difficult to stabilize.
- Examples of the unsaturated carboxylic acid or derivative thereof include acrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, nadic acid (endocis-bicyclo [2.2.1]).
- Unsaturated carboxylic acids such as hept-5-ene-dicarboxylic acid]; or derivatives thereof such as acid halides, amideimides, anhydrides, esters and the like.
- Specific examples of such derivatives include maleyl chloride, maleimide, maleic anhydride, citraconic anhydride, monomethyl maleate, dimethyl maleate, glycidyl maleate and the like. In these, unsaturated dicarboxylic acid and its acid anhydride are preferable, and especially maleic acid, nadic acid, and these acid anhydrides are preferable.
- the modified ethylene polymer can be produced by various known methods. For example, an ethylene-based polymer is dissolved in an organic solvent, and then an unsaturated carboxylic acid or a derivative thereof and a radical initiator such as an organic peroxide as necessary are added to the obtained solution. Preferably, a method of reacting at a temperature of 80 to 190 ° C. for 0.5 to 15 hours, preferably 1 to 10 hours, or using an extruder or the like, in a solvent-free manner, with an ethylenic polymer and an unsaturated carboxylic acid.
- the ⁇ -olefin include ⁇ -olefins having 3 or more carbon atoms, preferably 3 to 10, and specifically include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, Examples include 1-decene, 4-methyl-1-pentene, and combinations of two or more thereof.
- the copolymerization amount of the ⁇ -olefin is not particularly limited as long as the obtained density is within the above range, but is usually 10 mol% or less.
- the density of the ethylene polymer before modification is not particularly limited as long as the density of the resulting modified ethylene polymer is within the above range.
- the ethylene-based polymer before modification can be produced by a known method, for example, a high-pressure method or a low-pressure method using a Ziegler type Ti-based catalyst, a Co-based catalyst, a metallocene-based catalyst, or the like.
- the content ratio of the ethylene polymer (A1) and the ethylene polymer (A2) in the ethylene polymer (A) is 100 weights of the total of the ethylene polymer (A1) and the ethylene polymer (A2).
- the ethylene polymer (A1) is preferably 20 to 40% by mass
- the ethylene polymer (A2) is preferably 60 to 80% by mass
- the blend (A2) is more preferably 63 to 77% by mass.
- Each of the ethylene polymer (A1) and the ethylene polymer (A2) may contain one kind of ethylene polymer alone, or may contain two or more kinds of ethylene polymers.
- the ethylene polymer (A1) contains two or more types of ethylene polymers
- the two or more types of ethylene polymers are respectively the density and melt flow rate requirements described for the ethylene polymer (A1).
- the ethylene polymer (A2) contains two or more kinds of ethylene polymers
- the two or more kinds of ethylene polymers each have the density and melt flow rate described for the ethylene polymer (A2). Satisfy requirements.
- the adhesive resin composition of the present invention satisfies the following requirements (1) to (4).
- the melt flow rate (MFR) at a temperature of 190 ° C. and a load of 2160 g, measured based on ASTM D 1238, is 0.1 to 3 g / 10 minutes, preferably 0.5 to 2 g / 10 minutes.
- MFR melt flow rate
- the mechanical strength may be lowered, and the interlayer adhesive force at a high temperature of 80 ° C. or more tends to be reduced.
- an adhesive resin composition having a density exceeding 930 kg / m 3 is used in a laminate with, for example, an ethylene / vinyl alcohol copolymer, the interlayer adhesive force tends to be unstable, and the low temperature drop impact strength of the laminate is low. There is a tendency to decrease.
- CEF crystallization elution fractionation chromatography
- the ratio of the eluted component at 50 ° C. or less is preferably 45% by mass or less, more preferably 40% by mass or less.
- the ratio of the eluted components at 90 ° C. or higher is 25% by mass or more, preferably 28% by mass or more.
- the ratio of the eluted component at 90 ° C. or higher is preferably 45% by mass or less, more preferably 40% by mass or less.
- the adhesive strength of the adhesive resin composition is more strongly expressed.
- a person skilled in the art can appropriately adjust the ratio of the elution components in the crystallization elution fractionation chromatography measurement.
- the adhesive resin composition of the present invention can be prepared by various known methods, for example, using an Henschel mixer, a tumbler blender, a V-blender, etc., with the ethylene polymer (A1) and the ethylene polymer (A2) in the above ratio range. It can be prepared by a dry blending method, after dry blending, a melt kneading method using a single screw extruder, a multi-screw extruder, a Banbury mixer, or the like, and a stirring and mixing method in the presence of a solvent.
- the adhesive resin composition of the present invention is an antioxidant, a weather stabilizer, an antistatic agent, an antifogging agent, an antiblocking agent, a lubricant, a nucleating agent, a pigment, etc., as long as the object of the present invention is not impaired. Or other polymers, rubbers and the like can be contained as required.
- the laminate of the present invention comprises a layer (I) containing an ethylene polymer, an adhesive layer (II) containing the adhesive resin composition, a layer (III) containing an ethylene / vinyl alcohol copolymer and / or A layer (IV) containing a polyamide resin is laminated, and the layer (II) is in direct contact with at least one of the layer (III) and the layer (IV).
- the laminate of the present invention can further have a regrind layer (V) between the layer (I) containing the ethylene polymer and the adhesive layer (II).
- the regrind layer (V) is a burr part (unnecessary part) generated when the laminate is molded, a recovered product (scrap) of the laminate, a defective product generated during molding, or if necessary, It is a layer formed by melt kneading the pulverized product with an extruder or the like (regrind).
- the regrind layer (V) does not need to be composed only of the recovered product, and the mechanical properties can be improved by blending the regrind layer (V) with, for example, the ethylene polymer used in the layer (I). .
- additives known per se such as a filler, a stabilizer, a lubricant, an antistatic agent, a flame retardant, and a foaming agent are blended as long as the object of the present invention is not impaired. be able to.
- the ethylene polymer contained in the layer (I) is an ethylene homopolymer or a random copolymer of ethylene and ⁇ -olefin.
- the amount of ⁇ -olefin copolymerization is not particularly limited as long as the density of the ethylene polymer is within the following range, but is usually preferably 10 mol% or less, more preferably 5 mol% or less. preferable.
- the ⁇ -olefin is preferably an ⁇ -olefin having 3 to 10 carbon atoms, and specifically, for example, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene and the like. Can be mentioned.
- the melt flow rate (MFR) [ASTM D 1238 (temperature: 190 ° C., load: 2160 g load)] of the ethylene polymer is preferably 0.01 to 5.0 g / 10 minutes, more preferably 0.05.
- the range is ⁇ 4 g / 10 minutes.
- the density of the ethylene polymer is preferably 940 to 980 kg / m 3 , more preferably 950 to 970 kg / m 3 .
- an ethylene polymer having an MFR larger than the above range is used, there is a possibility that the impact strength when the laminate is used is not sufficient.
- an ethylene polymer having an MFR smaller than the above range tends to be difficult to extrude.
- an ethylene-based polymer having a density lower than the above range is used, the resulting laminate may have poor permeability.
- Layer (III) and layer (IV) are gas barrier resin layers.
- the ethylene / vinyl alcohol copolymer (hereinafter also referred to as EVOH) contained in the layer (III) is preferably an ethylene / vinyl acetate copolymer having an ethylene content of 20 to 30 mol%, preferably 22 to 29 mol%. It is obtained by saponifying the coalescence.
- the saponification degree is not particularly limited, but is, for example, 90 to 100%, preferably 95 to 100%.
- a saponified product having an ethylene content of less than 20 mol% has a melting point and a decomposition temperature close to each other, and may be difficult to finely disperse in an ethylene-based polymer. On the other hand, if the ethylene content is too high, the barrier property is lowered and the object of the present invention may not be achieved.
- EVOH contained in the layer (III) may be a polymer further containing 10 to 40% by mass of a styrene elastomer.
- the layer (III) contains a styrene-based elastomer, so that flexibility of the film can be imparted while maintaining excellent gas barrier properties.
- styrenic elastomer examples include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), SBS hydrogenated block copolymer (SEBS), SIS Hydrogenated block copolymer (SEPS), block copolymer (SBBS) obtained by hydrogenating the vinyl bond portion of the butadiene block of SBS, styrene-isobutylene-styrene triblock copolymer (SIBS), styrene-ethylene-butylene- Examples thereof include a crystalline polyolefin block copolymer (SEBC). Of these, SEBS which is excellent in thermal stability and weather resistance is preferably used. In SEBS, a polybutadiene block is converted to an ethylene / butylene copolymer block by hydrogenation.
- SEBS crystalline polyolefin block copolymer
- Examples of the polyamide contained in the layer (IV) include nylon 6, nylon 66, nylon 610, nylon 12, nylon 11, MXD nylon, amorphous nylon, copolymer nylon, and the like.
- the layer structure of the laminate of the present invention is, for example, a layer (I) containing an ethylene polymer (hereinafter abbreviated as “PE layer (I)”) / an adhesive layer (II) containing an adhesive resin composition.
- PE layer (I) / an ethylene polymer
- II adhesive layer
- EVOH layer ethylene / vinyl alcohol copolymer
- NY layer a layer containing a polyamide resin
- the laminate of the present invention can be produced by a known molding method such as coextrusion film molding, sheet molding, coating, blowing, extrusion lamination, and the like.
- the laminate of the present invention has excellent gas barrier properties, and exhibits excellent interlayer adhesion and durability, and heat resistant adhesiveness. Since the laminated body of this invention has such a characteristic, it can be utilized for various uses. For example, a film containing the laminate can be produced from the laminate of the present invention, and a bag can be obtained from the film. Moreover, the packaging container containing this laminated body can be manufactured from the laminated body of this invention.
- Adhesive strength (N / 15mm) The initial adhesive strength of the laminate is a 15 mm width sample cut from the side of the laminate, and the adhesive strength between the inner layer side adhesive layer (II) and the layer containing the ethylene / vinyl alcohol copolymer (III). It measured in a 23 degreeC thermostat.
- the measuring method of the peeling test was the T-peeling method, and the peeling speed was 300 mm / min. This measurement was performed 5 times, and the average of the obtained numerical values was defined as the adhesive strength of the laminate.
- PE-0, PE-1, PE-2, PE-3, PE-4, and PE-5 which are ethylene polymers used in Examples and Comparative Examples (hereinafter referred to as ethylene polymer (PE-0), respectively) To (PE-5) are shown in Table 1.
- MAH amount means the grafting amount of maleic anhydride used as unsaturated carboxylic acid or derivative thereof, and comonomer content is derived from comonomer in all structural units constituting the ethylene polymer. It means the molar ratio of structural units.
- the obtained adhesive resin composition (1) had a density of 0.919 g / cm 3 and an MFR at 190 ° C. under a 2.16 kg load in accordance with ASTM D1238 of 0.8 g / 10 min.
- LLDPE layer (I) a layer made of the following LLDPE was used.
- the following layer composed of EVOH1 or EVOH2 was used to produce a laminate including the EVOH layer (III) composed of EVOH1 and a laminate including the EVOH layer (III) composed of EVOH2.
- EVOH1 ethylene / vinyl alcohol copolymer (ethylene content 27 mol%, SEBS 25 mass%, MFR 1.3 g / 10 min)
- EVOH2 ethylene / vinyl alcohol copolymer (ethylene content 44 mol%, MFR 1.7 g / 10 min)
- LLDPE linear low density polyethylene (Ultzex 2021L made of prime polymer)
- Example 2 Comparative Examples 1 to 4
- adhesive resin compositions were prepared in the same manner as in Example 1 except that the formulation was changed as shown in Table 2.
- Using the obtained adhesive resin composition a laminate was produced in the same manner as in Example 1, and the adhesive strength was measured. The results are shown in Table 2.
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
ポリエチレンは気体透過性が大きいので、包装や容器としては単独で用いることができない。このため、ポリエチレンに、ガスバリア性の高い他の材料、例えばポリアミドやエチレン・ビニルアルコール共重合体などのガスバリア性樹脂を積層させた上で包装や容器として使用されることが多い。また、ポリエチレンは無極性材料であるのでほとんど接着力を有していないので、ポリエチレンをガスバリア性樹脂に積層する上で様々な改良がなされている。
(1)ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~3g/10分である。
(2)密度が910~930kg/m3 である。
(3)結晶化溶出分別クロマトグラフィー測定において、50℃以下での溶出成分の比率が20質量%以上である。
(4)結晶化溶出分別クロマトグラフィー測定において、90℃以上での溶出成分の比率が25質量%以上である。
[2] 前記のエチレン系重合体(A)が、下記のエチレン系重合体(A1)20~40質量%と、エチレン系重合体(A2)60~80質量%〔但し、エチレン系重合体(A1)とエチレン系重合体(A2)との合計を100質量%とする〕とを含有し、前記エチレン系重合体(A1)およびエチレン系重合体(A2)の少なくとも一方が、不飽和カルボン酸またはその誘導体でグラフト変性されているエチレン系重合体を含むことを特徴とする[1]に記載の接着性樹脂組成物。
(A1)密度が930~965kg/m3であり、ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~10g/10分であるエチレン系重合体。
(A2)密度が858~929kg/m3であり、ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~10g/10分であるエチレン系重合体。
[3] エチレン系重合体を含む層(I)と、[1]または[2]に記載の接着性樹脂組成物を含む接着層(II)と、エチレン・ビニルアルコール共重合体を含む層(III)および/またはポリアミド樹脂を含む層(IV)とが、積層されており、かつ、前記層(II)が層(III)と層(IV)の少なくとも一方と直に接していることを特徴とする積層体。
[4] 上記エチレン・ビニルアルコール共重合体が、エチレンから導かれる構造単位の含有率20~30モル%のエチレン・酢酸ビニル共重合体をケン化して得られる重合体である、[3]に記載の積層体。
[5] 上記層(III)が、さらにスチレン系エラストマーを10~40質量%を含むである、請求項3に記載の積層体。
[6] 上記ポリアミド樹脂が、ナイロン6、ナイロン66、ナイロン610、ナイロン12、ナイロン11、MXDナイロン、アモルファスナイロン、共重合ナイロンの何れか1種以上を含む[3]~[5]のいずれかに記載の積層体。
[7] [3]~[6]のいずれかに記載の積層体を含むフィルム。
[8] [7]に記載のフィルムから得られる袋。
[9] [3]~[6]のいずれかに記載の積層体を含む包装容器。
本発明の接着性樹脂組成物は、不飽和カルボン酸またはその誘導体でグラフト変性されたエチレン系重合体を含むエチレン系重合体(A)を含有する。
(A1)密度が930~965kg/m3であり、ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~10g/10分であるエチレン系重合体。
(A2)密度が858~929kg/m3であり、ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~10g/10分であるエチレン系重合体。
ことにより、接着性の優れた接着性樹脂組成物が得られやすい。
エチレン系重合体(A1)が2種以上のエチレン系重合体を含む場合、その2種以上のエチレン系重合体はそれぞれ、上記エチレン系重合体(A1)について述べた密度およびメルトフローレートの要件を満たす。
エチレン系重合体(A2)が2種以上のエチレン系重合体を含む場合も、その2種以上のエチレン系重合体はそれぞれ、上記エチレン系重合体(A2)について述べた密度およびメルトフローレートの要件を満たす。
(1)ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~3g/10分であり、好ましくは0.5~2g/10分である。メルトフローレートが前記範囲内あることにより、成形性が良好な接着性樹脂組成物となる。
(2)密度が910~930kg/m3であり、好ましくは913~927kg/m3であり、より好ましくは914~925kg/m3であり、さらに好ましくは915~920kg/m3である。密度が910kg/m3未満の接着性樹脂組成物は、例えば容器等に用いた場合、機械的強度が低下する虞があり、また80℃以上の高温での層間接着力が低下する傾向がある。密度が930kg/m3を超える接着性樹脂組成物は、例えばエチレン・ビニルアルコール共重合体などとの積層体に用いた場合、層間接着力が不安定となり易く、積層体の低温落下衝撃強度が低下する傾向がある。
(3)結晶化溶出分別クロマトグラフィー(CEF)測定において、50℃以下での溶出成分の比率が20質量%以上であり、好ましくは23質量%以上である。50℃以下での溶出成分の比率は、好ましくは45質量%以下であり、より好ましくは40質量%以下である。
(4)結晶化溶出分別クロマトグラフィー(CEF)測定において、90℃以上での溶出成分の比率が25質量%以上であり、好ましくは28質量%以上である。90℃以上での溶出成分の比率は、好ましくは45質量%以下であり、より好ましくは40質量%以下である。
本発明の積層体は、エチレン系重合体を含む層(I)と、前記接着性樹脂組成物を含む接着層(II)と、エチレン・ビニルアルコール共重合体を含む層(III)および/またはポリアミド樹脂を含む層(IV)とが、積層されており、かつ、前記層(II)が層(III)と層(IV)の少なくとも一方と直に接している。
層(III)に含まれるエチレン・ビニルアルコール共重合体(以下、EVOHとも言う。)は、好ましくは、エチレン含有率20~30モル%、好ましくは22~29モル%のエチレン・酢酸ビニル共重合体をケン化して得られる。ケン化度は、特に制限はないが、例えば90~100%、好ましくは95~100%である。エチレン含有率が20モル%未満のケン化物は、融点と分解温度が接近しており、エチレン系重合体中に細かく分散させることが困難になる虞がある。また、エチレン含有率が大きくなりすぎると、バリア性が低下し本発明の目的に沿わなくなる虞がある。
PE層(I)/リグラインド層(V)/接着層(II)/EVOH層(III)、PE層(I)/リグラインド層(V)/接着層(II)/NY層(IV)、PE層(I)/接着層(II)/EVOH層(III)/接着層(II)、PE層(I)/接着層(II)/NY層(IV)/接着層(II)の4層構造;
PE層(I)/リグラインド層(V)/接着層(II)/EVOH層(III)/接着層(II)、PE層(I)/リグラインド層(V)/接着層(II)/NY層(IV)/接着層(II)、PE層(I)/接着層(II)/EVOH層(III)/接着層(II)/PE層(I)、PE層(I)/接着層(II)/NY層(IV)/接着層(II)/PE層(I)の5層構造;
PE層(I)/リグラインド層(V)/接着層(II)/EVOH層(III)/接着層(II)/PE層(I)、PE層(I)/リグラインド層(V)/接着層(II)/NY層(IV)/接着層(II)/PE層(I)の6層構造;
PE層(I)/リグラインド層(V)/接着層(II)/EVOH層(III)/接着層(II)/リグラインド層(V)/PE層(I)、PE層(I)/リグラインド層(V)/接着層(II)/NY層(IV)/接着層(II)/リグラインド層(V)/PE層(I)の7層構造等の層構造を取り得る。
本発明の積層体は、ガスバリア性が優れ、優れた層間接着力と耐久性、耐熱接着性を示す。本発明の積層体はこのような特性を有することから、様々な用途に利用することができる。例えば、本発明の積層体から、該積層体を含むフィルムを製造することができ、さらに該フィルムから袋を得ることができる。また、本発明の積層体から、該積層体を含む包装容器を製造することができる。
なお、実施例および比較例における物性の測定は以下の測定方法で行った。
(1)メルトフローレート(MFR)(g/10分)
メルトフローレートは、ASTM D 1238に準拠し、温度190℃、2160g荷重で測定した。
(2)密度(kg/m3)
密度は、ASTM D 1505に準拠して測定した。
(3)50℃以下での溶出成分の比率(%)および90℃以上での溶出成分の比率(%)
50℃以下での溶出成分の比率および90℃以上での溶出成分の比率は、結晶化溶出分別クロマトグラフィー(CEF)により測定し、全ピーク面積に対する、50℃以下で溶出した成分のピーク面積の比率および90℃以上で溶出した成分のピーク面積の比率より求めた。
(4)接着強度(N/15mm)
積層体の初期接着強度は、積層体の側面側から15mm幅でサンプルを切り出し、内層側の接着層(II)とエチレン・ビニルアルコール共重合体を含む層(III)との間の接着強度を23℃の恒温槽内で測定した。剥離試験の測定方法はT-剥離法、剥離速度は300mm/分とした。この測定を5回行い、得られた数値の平均をその積層体の接着強度とした。
(5)融点(℃)
融点は、DSCにより測定した。具体的には、試料5-10mg程度を専用アルミパンに詰め、30℃から200℃まで500℃/minで昇温し、200℃で10分間保持したのち、200℃から30℃までを10℃/minで降温し、30℃でさらに1分間保持し、次いで10℃/minで昇温する際の吸熱曲線より融点を求めた。
エチレン系重合体(A1)である、エチレン系重合体(PE-0)9質量%およびエチレン系重合体(PE-5)26質量%と、エチレン系重合体(A2)である、エチレン系重合体(PE-2)35質量%およびエチレン系重合体(PE-3)30質量%とを配合した混合物を一軸押出機で溶融混合して、接着性樹脂組成物(1)を得た。得られた接着性樹脂組成物(1)は、密度が0.919g/cm3であり、ASTM D1238に準拠した、190℃、2.16kg荷重におけるMFRが0.8g/10分であった。
層構造:
LLDPE層(I)/接着層(II)/EVOH層(III)/接着層(II)/LLDPE層(I)
層の厚み:LLDPE層(I) 350μm
接着層(II) 20μm
EVOH層(III) 20μm
T-ダイ成形機:LLDPE層(I) ダイ径40mmφ押出機、設定温度 220℃
接着層(II) ダイ径40mmφ押出機、設定温度 220℃
EVOH層(III) ダイ径30mmφ押出機、設定温度 220℃
成形速度:1.5m/分
LLDPE層(I)としては、下記のLLDPEからなる層を使用した。
EVOH層(III)としては、下記のEVOH1またはEVOH2からなる層を使用し、EVOH1からなるEVOH層(III)を含む積層体およびEVOH2からなるEVOH層(III)を含む積層体を製造した。
EVOH1:エチレン・ビニルアルコール共重合体(エチレン含量27モル%、SEBS 25質量%含む、MFR 1.3g/10分)
EVOH2:エチレン・ビニルアルコール共重合体(エチレン含量44モル%、MFR 1.7g/10分)
LLDPE:直鎖状低密度ポリエチレン(プライムポリマー製Ultzex2021L)
実施例2、比較例1~4については、配合処方を表2に示すとおりに変更した以外は実施例1と同様の方法で接着性樹脂組成物を調製した。得られた接着性樹脂組成物を用いて実施例1と同様に積層体を製造し、その接着強度を測定した。結果を表2に示す。
Claims (9)
- 不飽和カルボン酸またはその誘導体でグラフト変性されたエチレン系重合体を含むエチレン系重合体(A)を含有し、下記の要件(1)~(4)を満たすことを特徴とする接着性樹脂組成物。
(1)ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~3g/10分である。
(2)密度が910~930kg/m3 である。
(3)結晶化溶出分別クロマトグラフィー測定において、50℃以下での溶出成分の比率が20質量%以上である。
(4)結晶化溶出分別クロマトグラフィー測定において、90℃以上での溶出成分の比率が25質量%以上である。 - 前記のエチレン系重合体(A)が、下記のエチレン系重合体(A1)20~40質量%と、エチレン系重合体(A2)60~80質量%〔但し、エチレン系重合体(A1)とエチレン系重合体(A2)との合計を100質量%とする〕とを含有し、前記エチレン系重合体(A1)およびエチレン系重合体(A2)の少なくとも一方が、不飽和カルボン酸またはその誘導体でグラフト変性されているエチレン系重合体を含むことを特徴とする請求項1に記載の接着性樹脂組成物。
(A1)密度が930~965kg/m3であり、ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~10g/10分であるエチレン系重合体。
(A2)密度が858~929kg/m3であり、ASTM D 1238に基づき測定した、温度190℃、2160g荷重におけるメルトフローレート(MFR)が0.1~10g/10分であるエチレン系重合体。 - エチレン系重合体を含む層(I)と、請求項1または2に記載の接着性樹脂組成物を含む接着層(II)と、エチレン・ビニルアルコール共重合体を含む層(III)および/またはポリアミド樹脂を含む層(IV)とが、積層されており、かつ、前記層(II)が層(III)と層(IV)の少なくとも一方と直に接していることを特徴とする積層体。
- 上記エチレン・ビニルアルコール共重合体が、エチレンから導かれる構造単位の含有率20~30モル%のエチレン・酢酸ビニル共重合体をケン化して得られる重合体である、請求項3に記載の積層体。
- 上記エチレン・ビニルアルコール共重合体が、さらにスチレン系エラストマーを10~40質量%を含む重合体である、請求項3に記載の積層体。
- 上記ポリアミド樹脂が、ナイロン6、ナイロン66、ナイロン610、ナイロン12、ナイロン11、MXDナイロン、アモルファスナイロン、共重合ナイロンの何れか1種以上を含む請求項3~5のいずれかに記載の積層体。
- 請求項3~6のいずれかに記載の積層体を含むフィルム。
- 請求項7に記載のフィルムから得られる袋。
- 請求項3~6のいずれかに記載の積層体を含む包装容器。
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