JP2008174670A - Lactic acid-based resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lactic acid-based resin composition, a film formed from the lactic acid-based resin composition and a sealant comprising the film without impairing biodegradability, which inherent in polylactic acid. <P>SOLUTION: This lactic acid-based resin composition comprises 90-30 pts.mass ethylenic copolymer (A) selected from ethylene-(meth)acrylic ester copolymer (A1) and ethylene-vinyl ester copolymer (A2) and 10-70 pts.mass lactic acid-based resin (B), provided that the total of (A) and (B) makes 100 pts.mass. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lactic acid resin composition suitably used for a sealant and the like.

  In recent years, polyhydroxycarboxylic acids such as polylactic acid, and aliphatic polyesters derived from aliphatic polyhydric alcohols and aliphatic polycarboxylic acids have been developed as thermoplastic resins and biodegradable polymers. .

  These polymers degrade 100% within a few months to a year within the animal's body, or, when placed in soil or seawater, begin to degrade in a few weeks in a moist environment, about a year to a few years Disappears. Furthermore, the decomposition product has the property of becoming lactic acid, carbon dioxide and water that are harmless to the human body.

  In particular, polylactic acid has been recently produced in a large amount and at low cost by the fermentation method of L-lactic acid as a raw material, and has a high decomposition rate in compost, resistance to mold, and resistance to food. Since it has excellent characteristics such as odor and coloring resistance, it is expected to expand its application field.

In various fields of application of sealing materials, a resin excellent in flexibility and sealant suitability is required. Use of polyethylene and various ethylene copolymers as these resins has been studied. On the other hand, in recent years, so-called plant-based resins have attracted attention from the viewpoint of the preservation of the global environment, such as the suppression of CO ₂ emissions and the saving of fossil resources. Although polyethylene and various ethylene copolymers have flexibility and excellent sealant suitability depending on the type, they are polyolefin resins that are not plant-derived resins. Therefore, it is more preferable to use a so-called plant-derived resin from the viewpoint of conservation of the global environment such as CO ₂ emission suppression and fossil resource saving.
For these reasons, there has been a demand for a resin material for a flexible film suitable for a sealant and having a high plant-derived degree from the viewpoint of the global environment.

  An object of the present invention is to provide a plant-derived lactic acid resin composition, a film formed from the lactic acid resin composition, and a sealant comprising the film.

  As a result of intensive studies on the above problems, the present inventors have found that a resin composition containing a specific ethylene copolymer (A) and polylactic acid (B) can achieve the object of the present invention. It was.

  That is, the lactic acid resin composition of the present invention is an ethylene copolymer (A) 90 to 90 selected from ethylene- (meth) acrylic acid ester copolymer (A1) and ethylene-vinyl ester copolymer (A2). 30 mass parts and 10-70 mass parts of lactic acid-type resin (B) (however, the sum total of (A) and (B) is 100 mass parts) is characterized by the above-mentioned.

In the lactic acid resin composition, the ethylene- (meth) acrylic acid ester copolymer (A1) is preferably ethylene-methyl acrylate.
In the lactic acid resin composition, the ethylene-vinyl ester copolymer (A2) is preferably an ethylene-vinyl acetate copolymer.

The flexible film of the present invention is formed from the lactic acid resin composition.
The sealant of the present invention is characterized by comprising the flexible film.

  The film formed from the lactic acid resin composition of the present invention has heat sealability and flexibility, and has excellent performance as a sealant. Therefore, it can be suitably used as a wide range of materials such as various packaging materials such as food, electronics, chemicals, and cosmetics, agricultural materials, civil engineering / architectural materials, and compost materials.

Hereinafter, the lactic acid resin composition of the present invention will be specifically described.
[Ethylene- (meth) acrylic acid ester copolymer (A1)]
The ethylene- (meth) acrylic acid ester copolymer (A1) used in the present invention has a melt flow rate (MFR; JIS K7210, 190 ° C., 2160 g load) of 0.1 to 0.1.
It is 300 g / 10 minutes, preferably 0.2 to 250 g / 10 minutes, more preferably 0.5 to 200 g / 10 minutes. When the MFR of the ethylene- (meth) acrylic acid ester copolymer (A1) is within the above range, the lactic acid resin is excellent in workability and excellent in basic physical properties such as tensile strength at break and elongation at break. A composition is obtained.

  Specific examples of the unsaturated carboxylic acid ester component copolymerizable with ethylene in the ethylene- (meth) acrylic acid ester copolymer (A1) include methyl acrylate, ethyl acrylate, isopropyl acrylate, and isobutyl acrylate. N-butyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, and the like, with methyl acrylate and methyl methacrylate being particularly preferred.

  Specific examples of the ethylene- (meth) acrylic acid ester copolymer (A1) include ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), and ethylene-acrylic acid. Isopropyl copolymer, ethylene-isobutyl acrylate copolymer, ethylene-n-butyl acrylate copolymer, ethylene-isooctyl acrylate copolymer, ethylene-acrylic acid-2-ethylhexyl copolymer, ethylene-methacrylic acid Examples thereof include a methyl copolymer, an ethylene-ethyl methacrylate copolymer, and an ethylene-isobutyl methacrylate copolymer, and an ethylene-methyl methacrylate copolymer and an ethylene-methyl acrylate copolymer are particularly preferable.

  The ethylene- (meth) acrylic acid ester copolymer (A1) has an ethylene unit content of preferably 99.5 to 40% by weight, more preferably 95 to 50% by weight, more preferably 90 to 60% by weight. The structural unit content derived from the (meth) acrylic acid ester component ((meth) acrylic acid ester component unit content) is preferably 0.5 to 60% by weight, more preferably 5 to 50% by weight, more preferably 10 to 40% by weight. When the ethylene unit content of the ethylene-unsaturated carboxylic acid ester copolymer (A1) is within the above range, the resulting lactic acid-based resin composition is obtained from the ethylene- (meth) acrylic acid ester copolymer (A1). The preferable physical properties inherently possessed are maintained.

In the present invention, the ethylene / (meth) acrylic acid ester copolymer resin (A1)
May be produced by either autoclave high pressure polymerization method or tubular high pressure polymerization method, but it is more preferable to use a copolymer resin produced by the tubular high pressure polymerization method.

  The copolymer resin obtained by this method has, for example, a copolymer composition and an average molecular weight as compared with an ethylene / (meth) acrylate copolymer produced by another method such as a normal radical polymerization method. Even if they are the same, they have a high melting point, and still have different physical properties such as viscoelastic behavior in the molten state and other attributes.

  The tubular high pressure polymerization method is a method of radical polymerization using a free radical catalyst at a high pressure using a tubular reactor, for example, a method described in JP-A-62-273214 and the like. it can.

The copolymer obtained by the above tubular high pressure polymerization method preferably has a relationship between (meth) acrylic acid ester content: E (% by weight) and copolymer melting point: T (° C.) (JIS K7121 ISO) (I),
−0.8 × E + 115 ≧ T ≧ −0.8 × E + 109 (I)
Is a copolymer satisfying

[Ethylene-vinyl ester copolymer (A2)]
The ethylene-vinyl ester copolymer (A2) used in the present invention has a melt flow rate (MFR; JIS K7210, 190 ° C., 2160 g load) of 0.1 to 300 g / 10 minutes, preferably 0.2 to 200 g / 10 minutes, more preferably 0.2 to 100 g / 10 minutes. When the MFR of the ethylene-vinyl ester copolymer (A2) is within the above range, the lactic acid series has excellent workability and excellent basic physical properties such as tensile strength at break and elongation at break and excellent heat resistance. A resin composition is obtained.

  Specific examples of the vinyl ester component copolymerizable with ethylene in the ethylene-vinyl ester copolymer (A2) include vinyl acetate, vinyl propionate, vinyl n-butyrate, vinyl versatate, vinyl laurate, stearin. Examples include vinyl acid vinyl, vinyl benzoate, vinyl salicylate, and vinyl cyclohexanecarboxylate.

  Specific examples of the ethylene-vinyl ester copolymer (A2) include ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl propionate copolymer, ethylene-n-vinyl butyrate copolymer, ethylene- Persic acid vinyl copolymer, ethylene-vinyl laurate copolymer, ethylene-vinyl stearate copolymer, ethylene-vinyl benzoate copolymer, ethylene-vinyl salicylate copolymer, ethylene-vinyl cyclohexanecarboxylate copolymer Examples of the polymer include ethylene-vinyl acetate copolymer (EVA).

  The ethylene-vinyl ester copolymer (A2) has an ethylene unit content of 95 to 50 wt%, preferably 90 to 54 wt%, more preferably 85 to 60 wt%, and is a structural unit derived from a vinyl ester component The content (vinyl ester component unit content) is 5 to 50% by weight, preferably 10 to 46% by weight, and more preferably 15 to 40% by weight. When the ethylene unit content of the ethylene-vinyl ester copolymer (A2) is within the above range, the resulting lactic acid-based composition has preferable physical properties inherently possessed by the ethylene-vinyl ester copolymer (A2). keeping.

[Lactic acid resin (B)]
The lactic acid-based resin (B) in the present invention includes a polymer containing 50% by weight or more of a lactic acid component in terms of the weight of the monomer used for polymerization. Specific examples thereof include (i) polylactic acid,
(Ii) Copolymers of lactic acid and other aliphatic hydroxycarboxylic acids, (iii) Copolymers of lactic acid, aliphatic polyhydric alcohols and aliphatic polybasic acids, (iv) (i) to (iii) And (V) a mixture of the above (i) to (iv) and a biodegradable polyester.

  Examples of lactic acid used in the present invention include L-lactic acid, D-lactic acid, DL-lactic acid or a mixture thereof, or lactide which is a cyclic dimer of lactic acid. In particular, when L-lactic acid and D-lactic acid are used as a mixture, it is preferable that either L-lactic acid or D-lactic acid is contained in an amount of 75% by weight or more as a constituent component of the obtained polylactic acid.

<Production method of lactic acid resin (B)>
As a method for producing the lactic acid resin (B) used in the present invention,
(I) a method of direct dehydration polycondensation using lactic acid or a mixture of lactic acid and aliphatic hydroxycarboxylic acid as a raw material (for example, a production method shown in US Pat. No. 5,310,865), (ii) lactic acid A ring-opening polymerization method in which a cyclic dimer (lactide) is melt-polymerized (for example, a production method disclosed in US Pat. No. 2,758,987), (iii) a cyclic dimer of lactic acid and an aliphatic hydroxycarboxylic acid For example, a ring-opening polymerization method (for example, a production method disclosed in US Pat. No. 4,057,537) in which lactide or glycolide and ε-caprolactone are melt-polymerized in the presence of a catalyst, (iv) lactic acid, A method of directly dehydrating polycondensation of a mixture of an aliphatic dihydric alcohol and an aliphatic dibasic acid (for example, a production method disclosed in US Pat. No. 5,428,126), (v) polylactic acid and an aliphatic dibasic acid Price A method of condensing a polymer of alcohol and an aliphatic dibasic acid in the presence of an organic solvent (for example, a production method disclosed in European Patent Publication 0712880A2), and (vi) dehydration of lactic acid in the presence of a catalyst. In producing a polyester polymer by performing a polycondensation reaction, a method of performing solid phase polymerization in at least a part of the steps can be exemplified, but the production method is not particularly limited.

  Also, a small amount of an aliphatic polyhydric alcohol such as trimethylolpropane or glycerin, an aliphatic polybasic acid such as butanetetracarboxylic acid, or a polyhydric alcohol such as a polysaccharide may be copolymerized together. Alternatively, the molecular weight may be increased by using a binder (polymer chain extender) such as a diisocyanate compound.

<Molecular weight of lactic acid resin (B)>
The weight average molecular weight (Mw) and molecular weight distribution of the lactic acid resin (B) are not particularly limited as long as it can be practically molded. The weight average molecular weight of the lactic acid resin (B) used in the present invention is not particularly limited as long as it exhibits substantially sufficient mechanical properties. Generally, the weight average molecular weight (Mw) is preferably 3 to 1,000,000, more preferably 5 to 750,000, and most preferably 80 to 500,000. When the weight average molecular weight (Mw) is smaller than 30,000, the molded product obtained by molding the resin composition does not have sufficient mechanical properties, or conversely, when the molecular weight exceeds 1,000,000, melting during molding processing In some cases, the viscosity becomes extremely high, making it difficult to handle or making it uneconomical in production.

<Preferred form of lactic acid resin (B)>
One preferred form of the lactic acid resin (B) is a polylactic acid resin.
A preferable form of the polylactic acid resin is a polylactic acid resin (trade name: Lacia) manufactured by Mitsui Chemicals. Examples of “Lacia” brands include H-100, H-400, H-440, H-360, H-280, 100J, H-100E, and M-151S.
Q04, M151S Q52 and the like.

[Lactic acid resin composition]
The lactic acid resin composition of the present invention comprises an ethylene copolymer (A) selected from an ethylene- (meth) acrylic acid ester copolymer (A1) and an ethylene-vinyl ester copolymer (A2) and a lactic acid resin. (B).

  The ethylene- (meth) acrylic acid ester copolymer (A1) and the ethylene-vinyl ester copolymer (A2) can be used alone or in combination of two or more. Also, a blend of two or more kinds of copolymers (A1), a blend of two or more kinds of copolymers (A2), and the like may be used.

  In the lactic acid-based resin composition of the present invention, the ethylene-based copolymer (A) is 90 to 30 parts by mass with respect to 100 parts by mass of the total amount of the ethylene-based copolymer (A) and the lactic acid-based resin (B). And 10 to 70 parts by weight of the lactic acid resin (B), and 80 to 50 parts by mass of the ethylene copolymer (A) and 20 to 50 parts by mass of the lactic acid resin (B). It is particularly preferable to use 75 to 55 parts by mass of the ethylene copolymer (A) and 25 to 45 parts by mass of the lactic acid resin (B).

[Other ingredients]
The lactic acid based resin composition of the present invention may contain other resins used as necessary. Examples of such other resins include polyolefin resins usually used for film formation such as polyethylene and polypropylene, and ethylene-unsaturated carboxylic acid ionomers. As the ethylene-unsaturated carboxylic acid ionomer, one obtained by neutralizing 1 to 90 mol%, preferably 20 to 80 mol% of the carboxyl group of the ethylene-unsaturated carboxylic acid copolymer with a metal ion is used. As the metal ion, divalent metals such as zinc, magnesium, calcium and the like are preferable, and zinc is particularly preferable. As the ethylene-unsaturated carboxylic acid ionomer, for example, Zn ionomer of ethylene-methacrylic acid is preferably used. Moreover, conventionally well-known additives, such as a tackifier and a slip / anti-blocking agent, can also be mix | blended.

[Method for Preparing Lactic Acid Resin Composition]
As a method for preparing the lactic acid resin composition of the present invention, known and publicly used equipment and methods, for example, a kneader, a single-screw or multi-screw extruder, a mixer such as a tumbler or a Henschel mixer, and the like can be used. It is particularly suitable to melt and knead using a kneading apparatus such as a single-screw or twin-screw extruder. It is important to sufficiently dry the raw material in advance in order to exhibit good moldability of the resin composition.

The shape of the lactic acid resin composition of the present invention may be various shapes and sizes such as powder, pellets, and rods, and there is no limitation on the shape.
[Molded body and manufacturing method thereof]
The lactic acid-based resin composition of the present invention is a suitable material that can be applied to known publicly-known molding methods, and the obtained molded body is not particularly limited, but for example, multifilaments such as films, sheets, monofilaments, fibers and nonwoven fabrics And thermoformed bodies such as injection molded bodies, blow molded bodies, laminates, foams, and vacuum molded bodies. Especially, a film is mentioned as a particularly suitable use. In addition, the molded object obtained by this invention has the characteristic excellent in the softness | flexibility.

  As a molding method of a molded body formed from the lactic acid resin composition of the present invention, an injection molding method, a blow molding method (injection stretch blow, extrusion stretch blow, direct blow), balloon method, inflation molding, co-extrusion method, Calendar method, hot press method, solvent casting method, (stretching) extrusion molding, profile extrusion molding, thermoforming such as vacuum (pressure air) molding, melt spinning (monofilament, multifilament, spunbond method, meltblown method, etc.), defibration Examples thereof include a yarn method, a foam molding method such as extrusion foaming and mold foaming, and a compression molding method, and any method can be used. Of these, the blow molding method (extrusion stretch blow, direct blow), balloon method, inflation molding, coextrusion method, calendar method, extrusion molding, extrusion lamination method, profile extrusion molding, extrusion foam molding method and the like are preferably used.

In addition, the thickness of the film of the present invention can be variously changed depending on the application, but generally speaking, it is desirable that the thickness is in the range of 5 to 200 μm, preferably 10 to 100 μm.
The film of the present invention can be used as a laminate by pasting or co-extrusion using a conventionally known film or thin layer substrate and an adhesive or adhesive resin. Examples of the material for the film and the thin layer substrate include polylactic acid, polypropylene, polyethylene, polyamide (nylon), ethylene-vinyl alcohol copolymer, vapor deposited film, aluminum, paper and the like.

[Usage]
The film formed from the lactic acid resin composition of the present invention is excellent in heat sealability and flexibility, for example, as a sealant film, various packaging materials such as food, electronics, chemicals, cosmetics, agricultural use, civil engineering / architecture However, the present invention is not limited to this, although it can be suitably used as a wide range of materials such as industrial materials and compost materials.

〔Example〕
EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited at all by these Examples.

The tests, evaluations, and measurements of heat seal strength, strength at break, elongation, bending rigidity and hardness (Shore D) performed in Examples and Comparative Examples were performed according to the following methods.
(1) Heat seal strength Heat seal pressure 0.2 MPa, seal time 1 second, one side heating, 50 μm film resin layer surface created by inflation molding is bonded at a predetermined temperature, peel angle 90 ° (T peel) The strength when peeled at a peeling speed of 300 mm / min and a test piece width of 15 mm is shown.

(2) Strength at break (MPa)
Measured according to JIS K 6760.
(3) Elongation (%)
Measured according to JIS K 6760.

(4) Flexural rigidity Measured according to JIS K7106.
(5) Hardness (Shore D)
It measured according to JIS K7215.

The apparatus and molding method used for compound and film molding are as follows.
(1) Equipment compound (double screw extruder) PCM30
(2) Molding method Inflation molding (30mmφ inflation molding machine)
The components used in Examples and Comparative Examples are as follows.

・ Polyethylene (trade name: Mirason 16, manufactured by Prime Polymer)
Density 0.923
MFR (JIS K7210, 190 ° C., 2160 g load) = 3.7 g / 10 min [ethylene- (meth) acrylate copolymer]
・ Ethylene-methyl acrylate copolymer 1 (EMA1) (manufactured by tubular high pressure polymerization method)
Ethylene unit content = 80% by weight
Methyl acrylate unit content = 20% by weight
MFR (JIS K7210, 190 ° C., 2160 g load) = 8 g / 10 min Melting point (according to JIS K7121, ISO 3146) = 92 ° C.
・ Ethylene-methyl acrylate copolymer 2 (EMA2) (manufactured by tubular high pressure polymerization method)
Ethylene unit content = 76% by weight
Methyl acrylate unit content = 24% by weight
MFR (JIS K7210, 190 ° C., 2160 g load) = 2 g / 10 min Melting point (according to JIS K7121 ISO 3146) = 91 ° C.
[Ethylene-vinyl ester copolymer]
・ Ethylene-vinyl ester copolymer 1 (EVA1)
Ethylene unit content = 81% by weight
Vinyl acetate unit content = 19% by weight
MFR (JIS K7210, 190 ° C., 2160 g load) = 2.5 g / 10 minutes [Polylactic acid]
・ Polylactic acid 1: Lacia H-100 (PLA1)
MFR (JIS K7210, 190 ° C., 2160 g load) = 8 g / 10 minutes Melting point: 164 ° C. (DSC)
Polylactic acid 2: Lacia H-400 (PLA2)
MFR (JIS K7210, 190 ° C., 2160 g load) = 3 g / 10 min Melting point: 166 ° C. (DSC)
[Ionomer]
-Zn ionomer of ethylene-methacrylic acid copolymer (Ionomer 1)
Methacrylic acid unit content in ethylene-methacrylic acid copolymer = 10% by weight
Degree of neutralization = 73 mol%
MFR (JIS K7210, 190 ° C., 2160 g load) = 1.0 g / 10 min

After 70 parts by mass of ethylene-methyl acrylate copolymer 1 (EMA1) and 30 parts by mass of polylactic acid (trade name: H100, manufactured by Mitsui Chemicals) (PLA1) were previously dried with hot air and mixed, Using a 30 mm diameter twin screw extruder (compound PCM30), lactic acid resin composition pellets were obtained by melt kneading under conditions of a cylinder set temperature of 180 ° C. As shown in Table 1, the melt flow rate at 190 ° C. of the obtained lactic acid resin composition was 8.6 g / 10 min. Table 3 shows the physical properties of the press sheet.
Using this pellet, a film having a thickness of 50 μm was prepared by a 30 mmφ inflation molding machine set at a die temperature of 175 ° C. The results of the heat seal test of this film are shown in Table 2.

  Lactic acid-based resin composition pellets in the same manner as in Example 1, except that 30 parts by mass of polylactic acid (trade name: H400, manufactured by Mitsui Chemicals) (PLA2) was used instead of polylactic acid (trade name: H100). Was prepared. Further, a film was produced from this pellet in the same manner as in Example 1. The results are shown in Tables 1-3.

  60 parts by mass of ethylene-methyl acrylate copolymer 1 (EMA1), 32 parts by mass of polylactic acid (trade name: H100) (PLA1), and 8 parts by mass of ionomer 1 are the same as in Example 1. The method was used to obtain lactic acid resin composition pellets. Further, a film was produced from this pellet in the same manner as in Example 1. The results are shown in Tables 1-3.

  60 parts by mass of ethylene-vinyl ester copolymer 1 (EVA1), 32 parts by mass of polylactic acid (trade name: H100) (PLA1), 8 parts by mass of ionomer 1, and the same method as in Example 1 It was used as a lactic acid resin composition pellet. Further, a film was produced from this pellet in the same manner as in Example 1. The results are shown in Tables 1-3.

  40 parts by mass of ethylene-methyl acrylate copolymer (EMA1), 32 parts by mass of polylactic acid (trade name: H100) (PLA1), 28 parts by mass of ionomer 1 and the same method as in Example 1 To make a lactic acid resin composition pellet. Further, a film was produced from this pellet in the same manner as in Example 1. The results are shown in Tables 1-3.

  A lactic acid resin composition comprising 70 parts by mass of ethylene-methyl acrylate copolymer 2 (EMA2) and 30 parts by mass of polylactic acid (trade name: H400) (PLA2) using the same method as in Example 1. A pellet was obtained. Further, a film was produced from this pellet in the same manner as in Example 1. The results are shown in Tables 1-3.

  60 parts by mass of ethylene-methyl acrylate copolymer 2 (EMA2), 30 parts by mass of polylactic acid (trade name: H400) (PLA2), 10 parts by mass of ionomer 1 and the same as in Example 1 The method was used to obtain lactic acid resin composition pellets. Further, a film was produced from this pellet in the same manner as in Example 1. The results are shown in Tables 1-3.

[Comparative Example 1]
Using the same method as in Example 1, 70 parts by mass of polyethylene (trade name: Mirason 16, manufactured by Prime Polymer Co., Ltd.) and 30 parts by mass of polylactic acid (trade name: H100) (PLA1) were used. A pellet was obtained. Further, a film was produced from this pellet in the same manner as in Example 1. The results are shown in Tables 1-3.

[Comparative Example 2]
60 parts by mass of polyethylene (trade name: Mirason 16, manufactured by Prime Polymer Co., Ltd.), 32 parts by mass of polylactic acid (trade name: H100) (PLA1), and 8 parts by mass of ionomer 1 are the same as in Example 1. A lactic acid resin composition pellet was prepared using the above method. Further, a film was produced from this pellet in the same manner as in Example 1. The results are shown in Tables 1-3.

配合量は質量部で示す

The amount is shown in parts by mass.

表上段の値は剥離強度（Ｎ／１５ｍｍ）: 剥離時の最大値（ｎ＝５の平均値）を示す。
表下段は剥離形態を示す。
表中、「界面」は、フィルム界面の剥離、「樹脂切れ」は、フィルムの切断、凝集およびフィルム面内の凝集剥離を示す。

The values in the upper part of the table indicate the peel strength (N / 15 mm): the maximum value at the time of peel (average value of n = 5).
The lower part of the table shows the peeling form.
In the table, “interface” indicates peeling at the film interface, and “resin cut” indicates cutting, aggregation and in-plane aggregation peeling of the film.

プレスシート物性

Press sheet physical properties

Claims (5)

  90-30 parts by mass of an ethylene copolymer (A) selected from an ethylene- (meth) acrylic acid ester copolymer (A1) and an ethylene-vinyl ester copolymer (A2), and a lactic acid resin (B) 10 -70 mass parts (however, the sum total of (A) and (B) is 100 mass parts).   2. The lactic acid resin composition according to claim 1, wherein the ethylene- (meth) acrylic acid ester copolymer (A1) is ethylene-methyl acrylate.   The lactic acid resin composition according to claim 1 or 2, wherein the ethylene-vinyl ester copolymer (A2) is an ethylene-vinyl acetate copolymer.   The flexible film formed from the lactic acid-type resin composition in any one of Claims 1-3.   A sealant comprising the flexible film according to claim 4.