JP3409870B2 - Resin film - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a laminated resin film suitable for a packaging film for fresh vegetables, clothes, tobacco and the like.

[0002]

2. Description of the Related Art A high-pressure low-density polyethylene bag perforated is used for packaging potatoes and peppers. In addition, a film such as polyamide, polyethylene terephthalate, or biaxially oriented polypropylene, a surface of a base material layer such as paper, or front and back surfaces, a high-pressure low-density polyethylene, an ethylene-vinyl acetate copolymer, a linear low-density polyethylene, etc. The laminate (laminate) provided with the heat-sealable resin layer made of the ethylene resin film of
It is used as a packaging bag for noodle soup, juice, rice, ham, dog food, or liquid detergent.

Since packaging using these laminated resin films for forming bags is performed at a high speed due to the development of an automatic filling and packaging machine, it can be heat-sealed at a low temperature, the heat-sealing portion has a high fusion strength, and the hot tack property is excellent. In particular, it is desired that the heat-sealed portion has high pressure resistance and impact resistance.

As a resin film satisfying such demands, Japanese Unexamined Patent Publication (Kokai) No. 57-117547 discloses that (A) 20 to 98% by weight of a high-pressure (branched) low-density polyethylene is formed on the surface of an ethylene-based resin base layer. (B) A laminated body provided with a heat-sealing layer composed of 80 to 2% by weight of linear low-density polyethylene is disclosed in Japanese Examined Patent Publication No. 4-48620 as (A) linear low-density polyethylene and (B). 1 branch low density polyethylene
A laminate in which a heat-sealing layer containing 0 to 40% by weight is provided on a base material layer such as paper is disclosed in JP-A-60-123544 (A) ethylene-vinyl acetate copolymer 20 to 60% by weight. %, (B) 20 to 70% by weight of linear low-density polyethylene having a density of 0.910 to 0.940 g / cm ³ , and a density of 0.900.
-0.935 g / cm ³ high pressure low density polyethylene 1
A laminate having a heat-sealing layer of 0 to 60% by weight provided on the surface of a base material layer is disclosed in JP-A-58-93741 (A) ethylene-butene-1 copolymer (linear low Density polyethylene) 1
0 to 70% by weight, (B) low crystalline ethylene-butene-
1 copolymer 10 to 50% by weight and density 0.90 to
0.93 g / cm ³ high pressure low density polyethylene 5-8
A laminate in which a heat-sealing layer mixed with 0% by weight is provided on a base material layer is disclosed.

[0005]

The laminate of the above packaging materials and has a high heat-sealing temperature of 118 ° C. or higher, and is low in hot tack property, heat-sealing portion pressure resistance and impact resistance. The laminated body of the low temperature heat sealability,
Although the impact resistance strength of the heat seal part is slightly improved, the effect of improving the heat seal strength and hot tack property is not sufficient. An object of the present invention is to provide a resin film which gives a bag having a well-balanced low-temperature heat-sealing property, heat-sealing strength, hot tack property, and heat-sealing portion strength.

[0006]

The first aspect of the present invention is (A). 70 to 97% by weight of ethylene having a melt flow rate of 0.1 to 20 g / 10 minutes, and an ester-based monomer selected from vinyl alkyl ester or (meth) acrylic acid alkyl ester (provided that carbon of alkyl group is present). The number is 1 to 4) Ethylene copolymer obtained by copolymerizing with 30 to 3% by weight 40 to 92% by weight (B). The density is 0.900 to 0.935 g / cm ³ , and the melt flow rate is 0. 1 to 20 g / 10 min, linear low density polyethylene having a crystallinity of 30 to 65% 5 to 30% by weight (C). The density is 0.850 to 0.910 g / cm ³ , and the melt flow rate is 0. It is intended to provide a resin film comprising a resin composition containing 1 to 20 g / 10 minutes and 3 to 30% by weight of an ethylene-α-olefin copolymer having a crystallinity of less than 30%.

The second aspect of the present invention is (A). 70 to 97% by weight of ethylene having a melt flow rate of 0.1 to 20 g / 10 minutes, and an ester-based monomer selected from vinyl alkyl ester or (meth) acrylic acid alkyl ester (provided that carbon of alkyl group is present). The number is 1 to 4) Ethylene copolymer obtained by copolymerizing with 30 to 3% by weight 40 to 92% by weight (B). The density is 0.900 to 0.935 g / cm ³ , and the melt flow rate is 0. 1 to 20 g / 10 min, linear low density polyethylene having a crystallinity of 30 to 65% 5 to 30% by weight (C). The density is 0.850 to 0.910 g / cm ³ , and the melt flow rate is 0. Lamination in which a heat seal layer made of a resin composition containing 1 to 20 g / 10 minutes and an ethylene-α-olefin copolymer having a crystallinity of less than 30% 3 to 30% by weight is provided on the surface of a base material layer. A resin film is provided.

[0008]

By the presence of the ethylene copolymer having an ester group as the component (A) and the low density ethylene-α-olefin copolymer as the component (C), low-temperature heat-sealing property, hot tack property, and bag heat The pressure resistance of the seal portion is improved.
The presence of the linear low-density polyethylene as the component (B) improves the pressure resistance and impact resistance of the heat-sealed portion of the bag.

[0009]

DETAILED DESCRIPTION OF THE INVENTION Component (A) In the present invention, one ethylene-vinyl ester copolymer as the component (A) comprises 70 to 97% by weight of ethylene, preferably 80 to 95% by weight of vinyl ester. 30 to 3% by weight, preferably 20 to 5% by weight, using a radical generator (for example, organic peroxide, oxygen) as a catalyst, 10
It is obtained by copolymerizing at 0 to 400 ° C. under a pressure of 400 to 3000 Kg / cm ² . Preferably, the melt flow rate (JIS K-6730, 190
Extrusion moldability of the film is preferably 0.1 to 20 g / 10 minutes, more preferably 0.5 to 10 g / 10 minutes, and still more preferably 1.0 to 4 g / 10 minutes (° C, 2.16 Kg load).
Good in terms of heat seal strength.

Examples of the vinyl ester include vinyl acetate, vinyl acrylate, vinyl propionate, vinyl caprylate and the like, among which vinyl acetate is preferred. When the content of vinyl ester is less than 3% by weight, the low temperature heat-sealing property is poor, and when it exceeds 30% by weight, blocking of the heat-sealing layer becomes high, which is not suitable. The other ethylene- (meth) acrylic acid alkyl ester copolymer as the component (A) contains 70 to 97% by weight of ethylene, preferably 80 to 95% by weight.
% By weight and acrylic acid lower alkyl ester or methacrylic acid lower alkyl ester (the number of carbon atoms of the alkyl group is 1 to 8) [hereinafter, both are collectively referred to as (meth) acrylic acid alkyl ester. ] 30 to 3% by weight, preferably 20 to 5% by weight is 100 to 100% by using a radical generator.
It is obtained by copolymerization at 400 ° C. under a pressure of 400 to 3,000 Kg / cm ² .

Examples of alkyl (meth) acrylates include methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, isobutyl methacrylate, octyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, and acrylic. Butyl acid, isobutyl acrylate, octyl acrylate and the like can be mentioned. Of these, methyl methacrylate, ethyl methacrylate, methyl acrylate, and ethyl acrylate are preferable.

Further, in view of film extrudability and heat seal strength, melt flow rate (190 ° C., 2.1
6 Kg load) is 0.1 to 20 g / 10 minutes, more preferably 0.5 to 10 g / 10 minutes, still more preferably 1.0 to 4
It is preferably g / 10 minutes. If the content of the (meth) acrylic acid alkyl ester is less than 3% by weight, the low-temperature heat-sealing property is poor, and if it exceeds 30% by weight, blocking of the heat-sealing layer becomes high, which is not suitable.

Component (B) The component (B) linear low-density polyethylene includes ethylene and an α-olefin having 3 to 12 carbon atoms (eg, propylene, butene-1, hexene-1,4-methylpentene). -1, octene-1) with a Ziegler-Natta catalyst by a polymerization method such as a slurry polymerization method, a solution polymerization method, or a gas phase polymerization method, to obtain a crystalline linear low-density polyethylene. And has a density of 0.900
-0.935 g / cm < ³ >, preferably 0.910-0.
925 g / cm ³ , melt flow rate (JIS K-
6760, 190 ° C, 2.16Kg load) is 0.1-2
0 g / 10 minutes, preferably 1 to 5 g / 10 minutes, and having a crystallinity (X-ray method) of 30 to 65%, preferably 40 to 55%.

The linear low-density polyethylene has a density of 0.9.
Is less than 200 g / cm ³ is unsuitable, the higher the blocking of the heat seal layer is unsuitable poor low-temperature heat sealing property exceeds 0.935 g / cm ^3. Further, if the melt flow rate (MFR) is less than 0.1 g / 10 min, the extrusion load of the extruder becomes large, which is unsuitable.
If the amount exceeds the limit, the heat seal strength becomes low, which is not suitable.

Component (C) The low-density ethylene-α-olefin copolymer of component (C) is a catalyst or Ziegler comprising a vanadium compound and an organoaluminum compound containing ethylene and an α-olefin having 3 to 10 carbon atoms. A low density polyethylene copolymerized using a catalyst, having a crystallinity (X-ray method) of less than 30%, preferably 0 to 20%, and a density of 0.8.
50 to 0.910 g / cm ³ , preferably 0.860 to
0.900 g / cm ³ , melt flow rate (JIS
K-7210, 190 ° C, 2.16Kg load) is 0.1
-20 g / 10 minutes, preferably 1-5 g / 10 minutes.

When the crystallinity exceeds 30%, the effect of improving low temperature heat sealing and hot tack properties is low. This low density ethylene-α-olefin copolymer has a crystallinity of 0.
% May be amorphous as in some examples. The density is 0.
If it is less than 850 g / cm ³ , blocking of the heat-sealing layer becomes high, which is not suitable. The density is 0.910 g /
If it exceeds ³ cm ³ , the low temperature heat-sealing property is poor and it is not suitable. When the melt flow rate is less than 0.1 g / 10 minutes,
Extrusion load pressure applied to the extruder becomes large, and a large extruder is required. If it exceeds 20 g / 10 minutes, the heat seal strength and hot tack properties will be low.

Heat Seal Layer Composition The composition of the heat seal layer is 40 to 92% by weight, preferably 60 to 87% by weight of the component (A) ethylene-based copolymer having an ester group, and the straight chain of the component (B). Low density polyethylene is 5 to 30% by weight, preferably 8 to 20% by weight,
The low-density ethylene-α-olefin copolymer as the component (C) contains 3 to 30% by weight, preferably 5 to 20% by weight.

If the content of the ethylene copolymer (A) in the composition is less than 40% by weight, the low temperature heat sealability is poor and it is not suitable. On the other hand, if it exceeds 92% by weight, the heat seal strength is deteriorated, which is not preferable. If the linear low density polyethylene content of (B) is less than 5% by weight, the hot tack property is inferior, which is not suitable. Further, if it exceeds 30% by weight, the low-temperature heat-sealing property is deteriorated, which is not preferable. Further, the content of the low density ethylene-α-olefin copolymer of the component (C) is
If it is less than 3% by weight, the hot tack property is inferior and it is not suitable.
Further, if it exceeds 30% by weight, the low-temperature heat-sealing property is deteriorated, which is not preferable.

The heat seal layer forming resin composition usually contains a heat stabilizer, a light stabilizer, a weather resistance agent, a slip agent, an antiblocking agent, an antifogging agent, an antistatic agent, an inorganic agent, a pigment, a dye and the like. Various compounding agents used by adding to polyolefins, and polyolefins such as polybutene-1, polypropylene, and elastomers such as ethylene-propylene copolymer rubbers and ethylene-propylene-diene copolymer rubbers You may mix | blend in the range which does not impair.

Base Material Layer The resin composition for forming the heat seal layer itself has a low temperature heat sealability, heat seal strength, hot tack property,
Since the heat-sealing part has excellent pressure resistance and impact resistance, it can be used alone as a packaging film with a wall thickness of 8 to 300 μm, but it imparts gas barrier properties, strength, opacity, printability, etc. to the bag. Therefore, in general, it is often used by being laminated with a base material layer.

Examples of the material for the substrate layer include high-strength polyethylene, linear low-density polyethylene, polypropylene, polyamide, polyester, ethylene-vinyl alcohol copolymer, polycarbonate, and other unstretched or stretched plastic films, and Examples thereof include plastic films obtained by coating polyvinylidene chloride on these plastic films, gas barrier films obtained by vapor-depositing aluminum on a plastic film and silicon oxide, aluminum foil, cellophane, paper, non-woven fabric, flat yarn cloth, cloth and the like.

Laminates As a method for producing a laminate having these base material layers and a heat seal layer, a method of dry laminating a heat seal layer on these base material layers, an extrusion coating method, a method of sandwich laminating, a base material layer There is a method in which the forming resin and the heat-seal layer forming resin composition are melt-kneaded by using different extruders, supplied to one die, and co-extruded for molding. At this time, an adhesive layer may be interposed.

The thickness of the base material layer is 6 to 300 μm, preferably 6 to 100 μm, and the thickness of the heat seal layer is 2 to 10 μm.
It is 0 μm, preferably 2 to 50 μm. The thickness of the laminate is 10 to 400 μm, preferably 20 to 100.
μm. The heat seal layer is laminated on one side or both sides of the base material layer.

[0024]

【Example】

Example 1 A 15 μm thick nylon-6 film (Emblem RT manufactured by Unitika Ltd .; trade name) was used as a base material layer using an extrusion laminating apparatus equipped with an extruder having a diameter of 90 mmφ, and a polyurethane was applied on the corona-treated surface. An amount of 1 g / m ² of the system primer (Nipporan T-102 manufactured by Nippon Soda Co., Ltd. and a catalyst) was coated as an anchor. Then, a high-pressure low-density polyethylene [made by Mitsubishi Petrochemical Co., Ltd.
LK30 (trade name) MFR 4g / 10 minutes, density 0.9
18 g / cm ³ ] at a resin temperature of 320 ° C. and a coat thickness of 30
Extrusion coating lamination was carried out at a coating speed of 80 m / min.

Using another extrusion laminating device, 2 g of MFR was applied to the surface of the low density polyethylene of the above laminate.
/ 10 minutes, 80% by weight of ethylene-vinyl acetate copolymer (EVA) having a vinyl acetate content of 10% by weight, and MFR of 2 g /
10 minutes, 10% by weight of ethylene-hexene-1 copolymer (linear low-density polyethylene; L-LDPE) having a density of 0.920 g / cm ³ and a crystallinity of 50%, and MFR of 3.6 g.
/ 10 minutes, density 0.88 g / cm ³ , ethylene-butene-1 copolymer having a crystallinity of 10% [low crystallinity copolymer, manufactured by Mitsui Petrochemical Industry Co., Ltd., Tuffmer A-4085 (trade name)] 10 The resin composition for forming a heat-seal layer consisting of 10 wt% was extrusion coated at a resin temperature of 240 ° C., a coating thickness of 30 μm and a coating speed of 60 m / min using an extruder and a die, and a nylon-6 film 15 μm / low density polyethylene 30 μm / A laminated film having a heat seal layer of 30 μm was obtained. The obtained laminated film was evaluated for low-temperature heat-sealing property, heat-sealing strength, hot tack property, pressure resistance strength and impact resistance strength of the heat-sealing portion by the following methods.

Low-temperature heat-sealing property: The heat-sealing layers of the laminated film are superposed on each other, and a heat plate heat sealer is used.
Heat sealing is performed at a pressure of 2 Kg / cm ² , a time of 1 second, and a temperature of 80 to 120 ° C. at 10 ° C. intervals, and 120 to 160 ° C. at 20 ° C. intervals. The temperature is 23 ℃, relative humidity is 50%
15mm in width and 90mm in length after being left in a constant temperature room for 24 hours
Punched into strips of the same shape, and using a Shopper-type tensile tester under the above environmental conditions (pulling speed 300 mm / min T
Mold peel) The heat seal strength was measured. A straight line graph was drawn with the value of this heat seal strength as the heat seal strength on the vertical axis and the heat seal temperature on the horizontal axis, and the heat seal temperature at which the heat seal strength was 3.0 kg / 15 mm was defined as the low temperature heat sealability.

Heat seal strength: The heat seal strength was measured in the same manner as the low temperature heat seal property, and the heat seal temperature was 1
The heat seal strength at 60 ° C. (Kg / 15 mm width) was taken as the heat seal strength.

Hot tacking property: The laminated film is vertically (M
D) direction is cut into a width of 25 mm and a length of 300 mm, heat seal layers are overlapped with each other, and a hot plate heat sealer is used (however, one laminated film is fixed, and the other laminated film is loaded with a load of 50 g). Pressure 2 kg / cm
² , heat sealing was performed at a temperature of 120 ° C. and 160 ° C. for 1 second, and the above load was applied to the heat sealing portion immediately after the heat sealing. At this time, the peeling length (m
m) was defined as hot tack. (Therefore, the shorter the peel length, the better the hot tack property.)

Pressure-resistant strength of heat-sealed portion: Heat-sealed layers of laminated films are superposed on each other, and pressure is 2 Kg / c.
m ² , time 1 second, temperature 160 ℃, heat seal width 15m
At m, 200 cc of contents (mixed liquid of water / salad oil / vinegar = 1/1/1) was put and heat-sealed on four sides to form a bag (inside dimension of the bag 100 × 80 mm). After leaving this bag for 24 hours, pressure was applied to break the bag at the heat seal part, or the pressure at which a pin hole was generated and the contents leaked out was defined as the pressure resistance of the heat seal part.

Impact resistance strength of heat-sealed portion: The heat-sealed portion was heat-sealed in the same manner as the measurement of the heat-sealed strength (however, the heat-sealing width was 20 mm), and the punching impact of the heat-sealed portion was measured by a film punching impact tester. The punching impact strength (Kg-cm / 20 mm) at this time is defined as the impact resistance strength of the heat-sealed portion.

Examples-2, 3 and 4 A laminated film was produced in the same manner as in Example-1, except that the blending ratio of the resin composition for forming the heat-sealing layer was changed as shown in Table 1.

Example-5 In the process for producing the laminated film of Example-1, the processes up to the anchor coat were carried out in the same manner, and then the ethylene-vinyl acetate copolymerization used in Example-1 was applied to the anchor coat surface. Ozone treatment of the united film (the surface of the ethylene-vinyl acetate copolymer, which is in a molten state between the die of the extruder and the laminating nip roll, comes into contact with the previous anchor coat surface of the ethylene-vinyl acetate copolymer, the ozone concentration 15 g
/ M ³ gas, 0.5 liters / cm treatment width /
Sprayed with ozone in a small amount) and the resin temperature was 240
Extrusion coating lamination was carried out at a temperature of 30 ° C., a coat thickness of 30 μm and a coating speed of 60 m / min.

Then, using another extrusion laminating apparatus, the heat seal layer forming resin composition used in Example 1 was applied to the surface of the ethylene-vinyl acetate copolymer of the above laminate. Extrusion coating as in 1,
A laminated film having a nylon-6 film of 15 μm / ethylene-vinyl acetate copolymer of 30 μm / heat seal layer of 30 μm was obtained.

Example-6 In the production of the laminated film of Example-1, up to the anchor coat treatment was carried out in the same manner, and then the heat seal layer forming resin composition of Example-1 was applied to the anchor coat surface. Ozone treatment was performed in the same manner as in Example-1, and the resin temperature was 240.
℃, coating thickness 60μm, coating speed 60m / min extrusion coating, nylon-6 film 15μm
A laminated film having a heat seal layer of 60 μm was obtained.

Example 7 Using a T-die film apparatus equipped with an extruder having a diameter of 65 mmφ, the heat seal layer-forming resin composition used in Example 1 was treated with a resin temperature of 230 ° C. and a film thickness of 60 μm.
The film was extruded at a take-up speed of 60 m / min, and then one surface was subjected to corona discharge treatment (treatment amount: 30 watt-min / m.
² ) to obtain a T-die film.

Next, using a dry-dry laminating apparatus
And the corona of the nylon-6 film used in Example-1
Dry dry laminate adhesive (Toyo Mo
Hardon and Ad-coat AD-381A (trade name) and hard
Agent, coating amount after drying 3g / m ²] Then, the previous T die fill
The tape (with the corona discharge treated surface on the adhesive side)
Nylon-6 film 15μm / adhesive / heat seal
A laminated film with a layer thickness of 60 μm was obtained.

Example-8 In the production of the laminated film of Example-1, the heat-sealing layer-forming composition was prepared by adding ethylene-acrylic acid methyl ester (EMA) containing MFR 3 g / 10 min and acrylic acid methyl ester content 8% by weight. 80% by weight, 10% by weight of ethylene-hexene-1 copolymer (linear low-density polyethylene) used in Example-1, and 10% by weight of ethylene-butene-1 copolymer (low crystalline copolymer) 10 Nylon-6 film 1 as in Example 1 except that the composition was changed to wt%.
A laminated film of 5 μm / low density polyethylene 30 μm / heat seal layer 30 μm was obtained. Table 1 shows the physical properties of the obtained laminated film.

The abbreviations in the table are as follows. LDPE: Low density polyethylene; MFR (190 ° C) 4
g / 10 minutes, density 0.918 g / cm ³ , crystallinity 48
% EVA: ethylene-vinyl acetate copolymer; MFR (19
0 ° C.) 2 g / 10 min, vinyl acetate content 10% by weight L-LDPE: ethylene-hexene-1 copolymer (linear low density polyethylene); MFR (190 ° C.) 2 g / 1
0 minutes, density 0.920 g / cm ³ , crystallinity 50% Low crystalline copolymer: ethylene-butene-1 copolymer (low crystalline copolymer); MFR (190 ° C) 3.6 g / 10
Min, density 0.88 g / cm ³ , crystallinity 10% EMA: ethylene-acrylic acid methyl ester copolymer; methyl acrylate content 8% by weight, MFR 3 g / 10
Minute EME: ethylene-methacrylic acid ethyl ester copolymer; ethyl methacrylate content 10% by weight, MFR 2 g /
10 minutes

[0039]

[Table 1]

Comparative Examples-1, 2, 3, 4, 5, 6 and 7 In the method for producing a laminated resin film of Example-1, except that the heat seal layer forming resin composition used is changed as shown in Table 2. A laminated film was obtained in the same manner.

Comparative Example-8 In the method for producing a laminated film of Example-5, the resin composition for forming a heat-seal layer was prepared by adding 80% by weight of the ethylene-vinyl acetate copolymer used in Example-1 and ethylene- Hexene-1 copolymer (linear low-density polyethylene) 20
A laminated film of 15 μm nylon-6 film / 30 μm ethylene-vinyl acetate copolymer / 30 μm heat-sealing layer was obtained in the same manner as in Example-5 except that the composition was changed to wt%.

Comparative Example-9 In the process for producing the laminated film of Example-6, 80% by weight of the ethylene-vinyl acetate copolymer used in Example-1 and ethylene- were used as the heat seal layer forming resin composition.
Hexene-1 copolymer (linear low-density polyethylene) 2
Nylon-6 film 15 μm / heat seal layer 60 in the same manner as in Example 6 except that the composition was changed to 0% by weight.
A μm laminated film was obtained. Table 2 shows the physical properties of these laminated films.

[0043]

[Table 2]

Examples-9, 10, 11 and Comparative Example-1
0, 11, 12 The resin composition shown in Table 3 was melt-kneaded at 160 ° C. using an extruder having a screw diameter of 65 mmφ, and this was supplied to an inflation die and extruded into a film with a blow ratio of 2. After cooling, a tubular film having a wall thickness of 30 μm was obtained.

The physical properties of this tubular film were evaluated as follows. The results are shown in Table 3. Heat-sealing strength: Heat-sealing was performed in a longitudinal (MD) direction and a lateral direction of the test film with a hot plate heat sealer (sealing condition: temperature 150 ° C., pressure 2 Kg / cm ² , time 1
Seconds, heat seal width 5 mm, but heat seal by sandwiching the test piece between Teflon films having a thickness of 50 μm). Next, using an Instron type tensile tester, pulling speed 300m /
It was pulled in minutes and the heat seal strength was measured.

Tensile impact strength of heat-sealed portion: The film was heat-sealed in the same manner as the evaluation of the heat-sealed strength, and then a dumbbell having a length of 60 mm, a width of 10 mm, a width of the connecting portion of 3 mm, and an arc radius of 15 mmR of the connecting portion. Then, punching is performed so that the heat-sealed portion is located at the center in the length direction of the measurement test piece. Next, a tensile impact strength tester according to ASTM-D 1822-84 is used to apply a tensile impact to the heat seal portion with a pendulum hammer at a constant speed, and the tensile impact strength of the heat seal portion is measured. (Striking speed 3.4 m / sec, hammer lifting angle 150 °). The measurement result was converted into a 10 mm width.

[0047]

[Table 3]

[0048]

INDUSTRIAL APPLICABILITY The resin film of the present invention is excellent in heat-sealing property and pressure resistance and impact resistance of the heat-sealed portion, and is suitable for use as a packaging bag for foods, fruits and vegetables, clothes, toys and the like.

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) C08L 23/00-23/36 C08J 5/18 B32B 27/28

Claims (2)

(57) [Claims] 1. (A). Melt flow rate is 0.1
20-g / 10 minutes, 70-97 wt% of ethylene, and an ester-based monomer selected from vinyl alkyl ester or (meth) acrylic acid alkyl ester (however, the alkyl group has 1 to 4 carbon atoms) 30 to 3 40% to 92% by weight of an ethylene-based copolymer obtained by copolymerizing (B). The density is 0.900 to 0.935 g / cm ³ , and the melt flow rate is 0. 1 to 20 g / 10 min, linear low density polyethylene having a crystallinity of 30 to 65% 5 to 30% by weight (C). The density is 0.850 to 0.910 g / cm ³ , and the melt flow rate is 0. A resin film comprising a resin composition containing 1 to 20 g / 10 minutes and 3 to 30% by weight of an ethylene-α-olefin copolymer having a crystallinity of less than 30%. 2. (A). Melt flow rate is 0.1
20-g / 10 minutes, 70-97 wt% of ethylene, and an ester-based monomer selected from vinyl alkyl ester or (meth) acrylic acid alkyl ester (however, the alkyl group has 1 to 4 carbon atoms) 30 to 3 40% to 92% by weight of an ethylene-based copolymer obtained by copolymerizing (B). The density is 0.900 to 0.935 g / cm ³ , and the melt flow rate is 0. 1 to 20 g / 10 min, linear low density polyethylene having a crystallinity of 30 to 65% 5 to 30% by weight (C). The density is 0.850 to 0.910 g / cm ³ , and the melt flow rate is 0. Lamination in which a heat seal layer made of a resin composition containing 1 to 20 g / 10 minutes and an ethylene-α-olefin copolymer having a crystallinity of less than 30% 3 to 30% by weight is provided on the surface of a base material layer. Resin film.