JPH11245338A - Stretchable composite film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a film usable for a gather member or the like of a stretchable disposable diaper or the like which can be incinerated recyclably without generating harmful substance. SOLUTION: The stretchable composite film is obtained by laminating a film made of a resin composition containing 60 to 95% of a low density polyethylene including 18% or more of 4-8C α-olefin comonomer having a density of 0.86 to 0.90 g/cm<3> , a melt index of 0.1 to 50 g/10 min and a weight average molecular weight/number average molecular weight of 1.8 to 2.8, 100 pts.wt. of a composition containing 5 to 40% of a polyethylene and 5 to 40 pts.wt. of an inorganic filler, and a styrene thermoplastic elastomer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretchable composite film, and more particularly to a stretchable composite film used as a gather member in a disposable diaper or the like.

[0002]

2. Description of the Related Art Gathering members requiring elasticity such as disposable diapers for babies and adults and napkins with gathers include synthetic rubbers such as polyurethane foams, polyurethane films, polyurethane elastic yarns, styrene elastomers, and natural rubbers. Rubber, such as rubber, or those obtained by hot-melting them with a nonwoven fabric or the like are used. However, polyurethane foam has problems such as low strength, high price, and inability to heat bond with various nonwoven fabrics, etc., and polyurethane-based films generally have too high stretch strength, poor hot melt adhesion, and blocking. easy,
There are problems such as the necessity of using release paper during film formation, and polyurethane elastic yarns have problems such as poor hot-melt adhesion and inability to heat-bond. Further, natural rubber has an advantage in price, but has problems such as extremely poor hot-melt adhesiveness and thermal adhesion. Further, as common drawbacks of these elastic members, there are major problems that they cannot be recycled and cannot be incinerated due to generation of harmful substances.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a film which can be recycled and is used as a gather member in an elastic disposable paper diaper which can be incinerated without generating harmful substances. And

[0004]

The present inventors have focused on polyolefin elastomers as materials that can be recycled and incinerated. One of them is a copolymer of ethylene and α-olefin, A study was conducted on the applicability of a low-density polyethylene elastomer having a narrow molecular weight distribution and a low crystallinity to the gather member. As a result, the low-density polyethylene elastomer alone could not form a film because the film was sticky, but by adding polyethylene and further an inorganic filler to the low-density polyethylene elastomer, the film could be formed,
The opening property at the time of film formation and the blocking of the film after winding are improved, the increase in elongation strain of the film can be suppressed, and the film obtained here almost meets the physical properties required as the above members. Was found.
However, this film has a problem that the strength and strain at the time of elongation are somewhat high, and it has been found that this problem can be solved by laminating a film made of a styrene-based thermoplastic elastomer on this film, and the present invention has been completed. .

That is, according to the present invention, (a) the density is 0.8
6 to 0.90 g / cm ³ , melt index 0.1
Low-density polyethylene having a weight-average molecular weight / number-average molecular weight of 1.8 to 2.8 and a carbon number of 4 to 8 and containing at least 18% by weight of a low-density polyethylene of 60 to 95% by weight. % And (b) polyethylene 5-4
Film (A) comprising a composition containing 0% by weight and film (F) comprising a styrene-based thermoplastic elastomer
The gist of the present invention is a stretchable composite film obtained by laminating.

Further, the present invention relates to (a) a method wherein the density is from 0.86 to 0.86.
0.90 g / cm ³ , melt index 0.1-5
0 g / 10 min, weight average molecular weight / number average molecular weight of 1.8
A composition 100 containing 60 to 95% by weight of low density polyethylene containing 18% by weight or more of an α-olefin comonomer having 4 to 8 carbon atoms and (b) 5 to 40% by weight of polyethylene; The gist is a stretchable composite film obtained by laminating a film (B) composed of a resin composition containing 5 to 40 parts by weight of an inorganic filler and (c) a film (F) composed of a styrene-based thermoplastic elastomer. I do.

[0007] The composite film of the present invention is characterized in that the α-olefin comonomer is 1-octene and the content thereof is 20 to 35% by weight. or,
The composite film of the present invention is characterized in that the polyethylene (b) has a density of 0.915 to 0.925 g / cm ³ and a melt index of 0.5 to 10.0 g / 10 minutes. In the composite film of the present invention, the styrene-based thermoplastic elastomer has a styrene content of 10%.
-40% by weight, and the melt flow rate is 0.5-
It is 8.0 g / 10 minutes.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The film (A) forming the stretchable composite film of the present invention has (a) a density of 0.86-0.
90 g / cm ³ , melt index 0.1-50 g
/ 10 minutes, weight average molecular weight / number average molecular weight is 1.8 to
A low-density polyethylene 6 containing 18% by weight or more of an α-olefin comonomer having 4 to 8 carbon atoms.
0 to 95% by weight and (b) 5 to 40% by weight of polyethylene
And a composition containing

Further, the film (B) forming the stretchable composite film of the present invention has (a) a density of 0.86 to 0.9.
0 g / cm ³ , melt index 0.1-50 g /
10 minutes, weight average molecular weight / number average molecular weight is 1.8 to 2.
8, low-density polyethylene 60 to 18% by weight containing at least 18% by weight of an α-olefin comonomer having 4 to 8 carbon atoms.
100 parts by weight of a composition containing 95% by weight and (b) 5 to 40% by weight of polyethylene; and (c) 5 to 5% by weight of an inorganic filler.
It consists of a resin composition containing 40 parts by weight.

The low-density polyethylene (a) of the film (A) and the film (B) (hereinafter referred to as component (a)) has a density of 0.86 to 0.90 g / c.
m ³ , melt index is 0.1 to 50 g / 10 minutes,
Weight average molecular weight / number average molecular weight is 1.8 to 2.8, and 1 to 4 carbon atoms of an α-olefin comonomer
It contains at least 8% by weight. Among the above α-olefin comonomers, 1-octene is desirable, and
Those having a content of 20 to 35% by weight are particularly desirable.
If the content of the α-olefin comonomer is less than 18% by weight, sufficient flexibility cannot be obtained. The component (a) has a melt index (MI: 190 ° C., load 2.16 kg) of 0.1 to 50 g / 10 min, preferably 0.5 to 20 g / min.
A 10 minute one is used. If the MI is less than 0.1 g / 10 minutes, the torque increases during film formation, and extreme melt fracture occurs. If the MI exceeds 50 g / 10 minutes, bubbles become unstable and the film formation stability becomes poor. Getting worse.
The component (a) is characterized in that the weight average molecular weight / number average molecular weight (Mw / Mn), which is a measure of the molecular weight distribution, is as small as 1.8 to 2.8.
Those produced using a metallocene catalyst capable of narrowing the width of the molecular weight distribution are preferable. The metallocene catalyst is a metallocene having a structure in which a transition metal such as titanium, zirconium, or hafnium is sandwiched by an unsaturated cyclic compound containing a π-electron cyclopentadienyl group or a substituted cyclopentadienyl group, It is a combination of a co-catalyst such as an aluminum compound. The component (a) is obtained by, for example, reacting a metallocene such as titanocene or zirconocene with a metallocene catalyst obtained by activating a metallocene such as an alkylaluminoxane, an alkylaluminum, an aluminum halide or an alkylaluminum halide as a cocatalyst in the presence of a metallocene catalyst. Α-olefins having 4 to 8 carbon atoms, preferably 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene and the like, particularly preferably 1-octene; It can be produced by solution polymerization.

The polyethylene of the component (b) of the film (A) and the film (B) is 0.915 to 0.950.
g / cm ³ . Polyethylene having such a density has a density of 0.915 to 0.925 g.
/ Cm ³ , a low-density polyethylene obtained by a high-pressure method and a density obtained by copolymerizing with a trace amount of α-olefin such as 1-butene in the presence of a Ziegler catalyst have a density of 0.920-0.
930 g / cm ³ linear low density polyethylene (LL
DPE) and a medium-density polyethylene having a density of 0.926 to 0.940 g / cm ^3. Among these, the density obtained by the high-pressure method is 0.915 to 0.925 g / cm 3.
³ , the melt index (MI: 190 ° C., load 2.
16 kg) is preferably 0.5 to 10 g / 10 min.

Examples of the inorganic filler of the component (c) of the film (B) include talc, calcium carbonate, zeolite, gypsum, carbon black, mica, clay, kaolin, silica, and diatomaceous earth. Of these, talc and calcium carbonate are particularly preferred. These inorganic fillers are desirably in the form of particles having an average particle diameter of 0.5 to 5 μm, and those whose surface is treated with a surface treating agent such as a fatty acid can also be used.

[0013] The resin composition forming the film (A) comprises:
Component (a) is 60 to 95% by weight and component (b) is 5 to 4%.
It contains 0% by weight. (A) Component is 60% by weight
When the amount is less than the above, the flexibility of the film is insufficient, and when the amount exceeds 95% by weight, the opening property and the stability during the film formation by the inflation method are deteriorated. When the component (b) is less than 5% by weight,
The stability of bubbles during film formation by the inflation method deteriorates, and if it exceeds 40% by weight, distortion when the film is stretched (at 100% stretching) increases.

The resin composition for forming the film (B) is as follows:
Component (a) is 60 to 95% by weight and component (b) is 5 to 4%.
It contains 100 parts by weight of a composition containing 0% by weight and (c) 5 to 40 parts by weight of an inorganic filler. If the component (a) is less than 60% by weight, the flexibility of the film is insufficient,
If the content exceeds 95% by weight, the opening property and the film formation stability at the time of film formation by the inflation method deteriorate. If the component (b) is less than 5% by weight, the stability of bubbles at the time of film formation by the inflation method is deteriorated, and if it exceeds 40% by weight, distortion when the film is elongated (at 100% elongation) increases.
Further, a composition 100 containing the component (a) and the component (b)
If the component (c) is less than 5 parts by weight per part by weight, the opening property,
If the blocking resistance deteriorates and exceeds 40 parts by weight, the flexibility becomes insufficient, which is not preferable.

The above component (a) and each of the above resin compositions are
In addition to the above components, other components such as an antioxidant, an ultraviolet absorber, and a coloring agent can be appropriately compounded. (A) above
The component or each of the above resin compositions is added with the component (a), the component (b), the component (c), and other components as necessary, and is preliminarily dry-blended using, for example, a Henschel mixer or a high-speed mixer. For example, the mixture is melt-kneaded using an extruder or the like under heating at about 160 to 220 ° C., extruded, and pelletized. The method of forming a film (A) or a film (B) from each of the above resin compositions is as follows:
Although a flat film can be formed by a molding method using a T-die extruder that is often performed,
In consideration of the balance between the strength of the film in the vertical and horizontal directions and the high-speed forming property of the thin film (improvement in productivity), an air-cooled inflation molding method for forming a tubular film is preferred.
The air-cooled inflation molding method uses a resin temperature of 140 to 18
It is desirable to carry out at 0 ° C. with a blow ratio of 2.0 to 5.0.

The film (F) forming the stretchable composite film of the present invention comprises a styrene-based thermoplastic elastomer. Examples of the elastomer include a block copolymer of a polymer block mainly composed of styrene and a polymer block mainly composed of conjugated diene such as butadiene and isoprene, and a hydrogenated product of this block copolymer. Specific examples thereof include styrene-butadiene block copolymer, styrene-isoprene block copolymer, styrene-butadiene-styrene block copolymer (SB
S), styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-butene-styrene block copolymer (SEB) which is a hydrogenated product of SBS
S), styrene hydrogenated styrene-ethylene-
Propylene-styrene block copolymer (SEPS) and the like can be mentioned. Among them, SBS, SI
Three-component block copolymers such as S, SEBS, and SEPS are preferred. Each of these block copolymers has a styrene polymer block content of 40% by weight or less,
It is desirable that the melt flow rate be 0.5 to 8.0 g / 10 minutes. Styrene polymer block content of 4
If the content is more than 0% by weight, the resulting film is hard and the distortion is undesirably large. If the melt flow rate is less than 0.5 g / 10 minutes, melt fracture will occur. If the melt flow rate exceeds 8.0 g / 10 minutes, bubbles become unstable, which is not preferable.

The method for forming the film (F) from the styrene-based thermoplastic elastomer may be in accordance with a general plastic film forming method, for example, in the same manner as the film (A) or film (B) forming method. May be. The thickness of the film (F) is appropriately selected depending on the use of the composite film of the present invention.
It is.

The stretchable composite film of the present invention is obtained by laminating the film (A) or the film (B) (the film (A) as a representative thereof) and the film (F). It is. The lamination of both is performed by a dry lamination method in which the film (A) and the film (F) are bonded via an adhesive, and an extrusion coating method in which the molten raw material resin of the other film is extruded on one film into a film shape and bonded. , Film (A) and film (F)
This is performed by an ordinary laminating method such as a co-extrusion coating method in which the two molten resin materials are simultaneously extruded into a film shape and joined. The stretchable composite film of the present invention has, for example, a film (A) / film (F) / film (A) and a film (F) / film (A) in addition to the two-layer structure of the film (A) and the film (F) alone. ) / Film (F), Film (A) / Film (F) / Film (A) / Film (F) / Film (A).

The thickness of the above-mentioned composite film is appropriately selected according to its use and is not specified, but is usually 10
３００300 μm. Therefore, the thickness of each of the film (A) and the film (F) constituting the composite film may be arbitrarily set so that the total thickness thereof corresponds to the thickness of the composite film. It is desirable that the thickness of (A) be thinner than that of film (F). Usually, the thickness of film (A) is 5 to 50 μm, and the thickness of film (F) is 5 to 250 μm.

Although the composite film of the present invention has the above-mentioned constitution, it can be used alone or laminated with other members for various uses in which the elasticity can be utilized. For example,
Further, a tape obtained by applying a hot melt adhesive or the like to the slit stretchable film is adhered to a nonwoven fabric, a woven fabric, a plastic film or a sheet, and a laminate thereof in a state where the tape is stretched, and the tape is stretched. If relaxed, for example, a gather member such as a diaper, a base material for an elastic compressible material, or the like can be obtained.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. Component (a) used in preparing the resin composition Component (a) -1 component: low-density polyethylene (manufactured by Dow Chemical Co., trade name Engage EG8150; MI 0.5 g / 10 Min, density 0.8
(68 g / cm ³ , Mw / Mn 2.15, 1-octene content 28% by weight) (a) -2 component: low-density polyethylene produced by using a metallocene catalyst (Dow Chemical Co., trade name Engage EG8200; MI4) 0.6g / 10min, density 0.8
71 g / cm ³ , Mw / Mn 1.96, 1-octene content 24% by weight) (b) Component (b) -1 component: High-pressure low-density polyethylene (manufactured by Nippon Unicar Co., Ltd., trade name DFD0148; MI6. 0g /
(10 minutes, density 0.923 g / cm ³ ) (b) -2 component: high-pressure low-density polyethylene (manufactured by Nippon Unicar Co., Ltd., trade name NUC8506; MI 0.8 g /
10 minutes, density 0.923 g / cm ³ ) (c) Component calcium carbonate (trade name PO, manufactured by Shiroishi Calcium Co., Ltd.)
Filler 150B; Styrenic thermoplastic elastomer forming film (F) ( average particle size: 2.2 μm)
Mer f-1: Styrene-butadiene-styrene block copolymer elastomer (manufactured by Dexa Copolymer, trade name VE
CTOR 8550D, styrene block content 30% by weight, MFR 2.1 g / 10 minutes at 190 ° C., density 0.94
g / cm ³ ) f-2: Styrene-isoprene-styrene block copolymer elastomer (manufactured by Dexa Copolymer, trade name VE)
CTOR4211, styrene block content 30% by weight, MFR 2.6 g / 10 minutes at 190 ° C, Shore hardness JIS A 60)

(Example 1) (1) Production of resin composition 83 parts by weight of (a) -1 component, 17 parts by weight of (b) -1 component and 10 parts by weight of component (c) were mixed with a super floater (Kawata Corporation). ), Dry-blended using Model SFC-50), melt-kneaded at 175 ° C using a twin-screw kneading extruder (Model TEX-30, manufactured by Nippon Steel Works, Ltd.), and pelletized resin composition. I got (2) Production of composite film The intermediate of the composite film from which f-1 as a styrene-based thermoplastic elastomer is obtained so as to be the outer layer and the inner layer of the composite film from which the resin composition obtained in (1) is obtained. Each layer is supplied to the following air-cooled inflation three-layer film forming apparatus under the following conditions so as to form a layer having a thickness of 50 μm.
m, a tube-shaped composite film having a folded diameter of 600 mm (blow-up ratio of 2.5) was produced and wound around a paper tube having a length of 60 m to obtain a sample film. The physical properties of the obtained sample film were measured by the following measurement methods, and the results are shown in Table 2. The film forming processability in Table 2 indicates that the bubble was stable at the time of the above-mentioned inflation film forming and that there was no rupture and the opening property was good, and that the bubble was stable. Although there was no, there was a portion having a portion that was slightly difficult to open, and a case where a film could not be formed was given as x.

Film forming apparatus / extruder Outer layer Placo 50 mm diameter Intermediate layer Placo keyfel 45 mm diameter Inner layer Modern Machinery 50 mm diameter Die 150 mm diameter spiral die Film forming conditions and sample use Film forming temperature 140-180 ° C. Take-off speed 10 m / min Outer layer / middle layer / inner layer thickness ratio 1/2/1 Method for measuring physical properties of film Strength at 50% elongation: Measured according to JIS L1096 using the following equipment and conditions. Equipment used: Strograph W (manufactured by Toyo Seiki Co., Ltd.) Measurement sample size: 25 mm × 150 mm Chuck interval: 100 mm Tensile speed: 300 mm / min Measurement atmosphere: 23 ° C., 50% RH 100% elongation strength: JIS L1096 And
The measurement was performed under the same conditions. Strength at 150% elongation and 2-cycle strain: JIS L1
The measurement was carried out under the same conditions as described in No. 096. Degree of blocking: A relatively outside portion of the film wound around the paper tube was cut in a transverse direction (TD) with a cutter to obtain a flat sheet. A laminate of this sheet is 55 mm
It was cut into a size of (TD) × 200 mm (MD) to obtain a sample for measuring the degree of blocking. Next, 200 mm (T
D) 6 mm on a glass plate of size 300 mm (MD)
A copy sheet of 0 mm × 180 mm × 90 μm is placed, and the above-mentioned samples are superposed on each other, and 20 sheets are stacked on each other. Then, a glass plate having a size of 180 mm × 200 mm × 8 mm and a weight of 830 g is further placed thereon. Put a weight of 5kg,
The film was stored in a gear oven at 45 ° C. for 7 days, and a relatively outer portion of the raw film wound on the paper tube was cut in a transverse direction (TD) with a cutter to obtain a two-ply sample. This sample was taken 150 mm (MD) x 25 mm (T
D) was cut out to obtain a sample for peel strength. This sample was pulled in the direction of 180 degrees, and its peel strength was measured according to JIS.
The measurement was performed three times under the following conditions in accordance with L1096, the average value was taken as the peel strength, and the value was used as a measure of the degree of blocking. Equipment used: Strograph W (manufactured by Toyo Seiki Co., Ltd.) Specimen size: 55 mm × 200 mm Chuck interval: 50 mm Peeling speed: 300 mm / min Thermal adhesion to nonwoven fabric: Between two 15 μm thick PET films The sample film is sandwiched between a commercially available nonwoven fabric made of polypropylene (having a basis weight of 24 g / m ² ) or a commercially available nonwoven fabric made of polyester (having a basis weight of 25 g / m ² ), and is heated at 50 ° C. using a heat sealer manufactured by Yasuda Seiki Seisakusho. Above, it heat-sealed on condition of the following, and measured the thermal adhesiveness on condition of the following. Heat sealing conditions Temperature: 140 ° C., time: 1 second, pressure: 2 kg / cm ² Seal width: 25 mm (cut to 15 mm when measuring thermal adhesiveness) Seal thickness: 9 mm Thermal adhesiveness measuring conditions Applicable equipment: Strograph W (Manufactured by Toyo Seiki Co., Ltd.) Specimen size: 55 mm × 200 mm Chuck interval: 30 mm Peeling speed: 500 mm / min Measurement atmosphere: 23 ° C., 50% RH

(Examples 2 to 5)
A resin composition was obtained in the same manner as in Example 1 except that the resin composition was used in the proportions shown in Table 1. Using the obtained resin composition and the styrene-based thermoplastic elastomer shown in Table 1, a composite film was obtained in the same manner as in Example 1, and the physical properties of those films were measured. The results are shown in Table 2.

Example 6 A resin composition was obtained in the same manner as in Example 1 except that the components shown in Table 1 were used in the proportions shown in Table 1. A film was formed by an air-cooled inflation method using the obtained resin composition and the styrene-based thermoplastic elastomer shown in Table 1. However, the inflation film was not separated into two pieces, but was wound while sandwiching a release paper in a tubular shape. A composite film having a thickness of 100 μm was obtained. The physical properties of the film were measured, and the results are shown in Table 2.

Comparative Example 1 Styrene used in Example 1
Since a butadiene-styrene block copolymer elastomer is difficult to form into an inflation film, a 50 μm-thick single-layer film was obtained by using a T-die film forming method together with release paper. Remove the release paper from this film, put the copy paper on top of each other, and weigh 5
After moving the roller of 00 g, the peel strength (blocking degree) was measured, and the results are shown in Table 2. Physical properties other than the peel strength were measured in the same manner as in Example 1, and the results are shown in Table 2.

(Comparative Example 2) Adipate-based thermoplastic polyurethane elastomer (Shore hardness JIS A87, melting start temperature 192 ° C) 60 parts by weight, ethylene-propylene-diene copolymer rubber (propylene content 27% by weight, iodine value 12gI) ₂ / 100g, Mooney viscosity ML1 +
8 ・ 20 ° C .; 51) 20 parts by weight and high-pressure low-density polyethylene (density 0.923 g / cm ³ , MI 0.8 g / 1
(0 min., 190 ° C.) 20 parts by weight were melt-kneaded with a biaxial kneader to obtain a thermoplastic polyurethane resin composition. Using this resin composition as a raw material, a single-layer polyurethane film having a thickness of 30 μm and a folded diameter of 600 mm was obtained using an air-cooled inflation film forming apparatus. The physical properties of this film were measured in the same manner as in Example 1, and the results are shown in Table 2.

(Comparative Example 3) The properties of a commercially available 1.5 mm-thick polyester urethane foam used for waist gathers and the like of children's diapers were measured in the same manner as in Example 1, and the results were shown in the Table. 2 is shown.

Reference Example Using the resin composition used in Example 1, an air-cooled inflation film forming apparatus was used to obtain a single-layer film having a thickness of 50 μm and a folded diameter of 600 mm. Physical properties of this film were measured in the same manner as in Example 1,
Table 2 shows the results.

[0030]

[Table 1]

[Table 2] As is clear from Table 2, a stretchable film can be stably formed from the resin composition according to the present invention, and the obtained composite film has the required elongation strength and strain required for the stretchable film. In addition to satisfying the breaking strength and the elongation, an effect of exhibiting excellent peel strength (opening property), blocking degree, and also excellent heat adhesion to a nonwoven fabric is exhibited.

[0031]

The composite film of the present invention is effective as a medical member such as a surgical drape because it has no odor in addition to maintaining the physical properties required for members such as gathers of disposable diapers. In addition, since it is hard to slip, it can be used as an anti-slip material, a finger patch material, and the like, and since it has a small peeling strength (opening property) and a low degree of blocking, the product can be stored for a long time under a certain environment. Also, the heat bonding strength with the nonwoven fabric is excellent. Then, one of the composite films can be stably formed by the inflation method, and the opening property of the tube at the time of film formation is also good.

Further, the film of the present invention can recycle defective products and unnecessary molded products, and can be incinerated without generating harmful substances.

Claims (5)

[Claims] (1) a density of 0.86 to 0.90 g / c
m ³ , melt index is 0.1 to 50 g / 10 minutes,
Weight average molecular weight / number average molecular weight is 1.8 to 2.8, and 1 to 4 carbon atoms of an α-olefin comonomer
A film (A) comprising a composition containing 60 to 95% by weight of low-density polyethylene containing 8% by weight or more and (b) a film containing 5 to 40% by weight of polyethylene and a film (F) consisting of a styrene-based thermoplastic elastomer are laminated. Stretch composite film. (2) The density is 0.86 to 0.90 g / c.
m ³ , melt index is 0.1 to 50 g / 10 minutes,
Weight average molecular weight / number average molecular weight is 1.8 to 2.8, and 1 to 4 carbon atoms of an α-olefin comonomer
Resin composition containing 60 to 95% by weight of low density polyethylene containing 8% by weight or more and (b) 100% by weight of a composition containing 5 to 40% by weight of polyethylene and (c) 5 to 40% by weight of inorganic filler (B) consisting of styrene-based thermoplastic elastomer and film (F) consisting of styrene-based thermoplastic elastomer
Stretch composite film formed by laminating. 3. The stretchable composite film according to claim 1, wherein the α-olefin comonomer is 1-octene and the content thereof is 20 to 35% by weight. 4. The polyethylene (b) has a density of 0.5.
A 915~0.925g / cm ^3, elastic composite film according to any one of claims 1 to 3 melt index is characterized by a 0.5~10.0g / 10 min. 5. The styrenic thermoplastic elastomer according to claim 1, wherein the styrene content is 10 to 40% by weight and the melt flow rate is 0.5 to 8.0 g / 10 min. The stretch composite film according to claim 4.