JP2002241514A - Ethylene-based resin film with highly antiblocking tendency and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a plastomer film giving packaging bags excellent in openability, low-temperature heat sealability, antiblocking tendency and loadability, through polymerization using a metallocene catalyst. SOLUTION: This method for producing an ethylene-based resin film comprises the following process: a plastomer film 2 melt-extruded from a T-die 1 is brought in between a semi-mat-toned metallic chill roll 3 under rotation and a mat-toned rubber roll 4 under rotation and cooled while nipping under pressure to obtain the objective film having the following characteristics: gloss is >=100% on the reverse face, coefficient of dynamic friction in the longitudinal direction between the mutual obverse faces is 0.18-0.50, coefficient of dynamic friction in the longitudinal direction between the mutual reverse faces is >=1.0, and blocking value is 0 g/10 cm2. Conventionally, although plastomer films of 100-600 g/10 cm2 in blocking value have barely been obtained even if compounded with an antiblocking agent and lubricant, the objective plastomer film of 0 g/10 cm2 in blocking value can be obtained even if compounded with no such additives by mat-finishing the reverse face of the film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent or translucent ethylene resin film, a printing paper laminate film, and a transparent resin blow bottle which provide a packaging bag which is easy to fill and pack and has excellent stackability. The present invention relates to an ethylene resin film excellent in anti-blocking property and low-temperature heat-sealing property suitable for an in-mold label and a method for producing the same.

[0002]

2. Description of the Related Art High density low density polyethylene (LDPE)
Polyethylene resin films such as linear low-density polyethylene (LLDPE) polymerized and produced using a Ziegler catalyst are excellent in heat sealability and transparency, and are inexpensive. It is used for bags, multi-films for agriculture, laminating films for liquid carton boxes and the like.

Similarly, ethylene / vinyl acetate copolymers,
Ethylene 7 such as ethylene / ethyl acrylate copolymer
8 to 92% by weight of a vinyl monomer having a polar group 22 to 22
8% by weight and the density obtained by copolymerization is 0.880 to
The ethylene copolymer of 0.910 g / cm ³ is also excellent in low-temperature heat sealability and transparency, and therefore, as a film-forming material itself, or nylon, polypropylene, polyethylene terephthalate, saponified ethylene / vinyl acetate. It is used as a material for forming a heat seal layer of a high melting point resin film such as a copolymer (Japanese Patent Laid-Open No. 10-86290,
10-179368, JP-A-2000-135783
issue).

[0004] Such high-pressure low-density polyethylene (LDP)
E) Instead of linear low-density polyethylene (LLDPE) polymerized and produced using Ziegler catalyst, ethylene and carbon are produced by using a metallocene catalyst which gives a film having better heat sealability and transparency at lower temperatures. The density obtained by copolymerizing α-olefins of numbers 4 to 20 is 0.880 to
The use of 0.915 g / cm ³ metallocene linear polyethylene (also referred to as “plastomer” in the industry to distinguish it from metallocene linear polyethylene having a density exceeding 0.915 g / cm ³ ) has been attempted. That is, the heat seal temperature for obtaining the same heat seal strength, for example, a heat seal strength of 300 g / 15 mm width is 0.9.
Chigura of 18 g / cm ³ - polymerization prepared, straight chain linear low density polyethylene using a catalyst (LLDPE) and density 0.
The temperature of the metallocene LLDPE produced by polymerization using a metallocene catalyst of 918 g / cm ³ is 117 ° C.
5 g / cm ³ of plastomer has a heat seal temperature of 9
5 ° C may be sufficient. (See the magazine "Convert-Tech", September 1998, pages 23-27).

[0005] However, a metallocene linear polyethylene having a density exceeding 0.915 g / cm ³ obtained by copolymerizing ethylene and an α-olefin having 4 to 20 carbon atoms using a metallocene catalyst does not contain an antiblocking agent. Even blocking (ASTM D-1893-6)
7) can obtain a film of 0 g / 10 cm ² , but in the case of a plastomer having a density of 0.880 to 0.915 g / cm ³ , blocking of the film obtained without blending an anti-blocking agent (ASTM D-1893-67) )
Is 200 to 1000 g / 10 cm ^2, which makes the bag open poorly.

[0006] Similarly, the density obtained by copolymerizing 78 to 92% by weight of ethylene and 22 to 8% by weight of a vinyl monomer having a polar group is 0.880 to 0.910 g /
cm ³ of ethylene copolymer than selected ethylenic resin, such as ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer The same applies to ethylene / methyl methacrylate copolymer, ethylene / ethyl methacrylate copolymer, ethylene / butyl acrylate copolymer, and the like.

As a method for improving the anti-blocking property of a film using an ethylene resin polymerized using a metallocene catalyst, Japanese Patent Application Laid-Open No. 9-157458 discloses a method in which a Q value obtained by polymerization using a metallocene catalyst is 1.5. ~ 5.0,
It is proposed to blend 100 to 2000 ppm of ethylene bisstearic acid amide as a lubricant with an ethylene resin having a composition distribution parameter of 1.01 to 1.2. However, the blocking is 1000-1900 g / cm
² and the improvement effect is not sufficient.

JP-A-10-29255 discloses a plastomer 90 having a density of 0.880 to 0.910 g / cm ³ .
1 to 99% by weight of high density polyethylene 10 to 1% by weight
With respect to 00 parts, the particle diameter of the anti-blocking agent is 0.5
A blocking value of 4 g / 20 mm or 5 g / 2 is obtained by blending 2 parts by weight of silica particles of 10 to 10 μm with 0.03 part of erucic acid amide as an anti-blocking agent.
It describes that a plastomer heat seal layer having 0 mm, a coefficient of dynamic friction of 0.24 or 0.27, and a seal starting temperature of 87 ° C. was obtained.

Further, Japanese Patent Application Laid-Open No. 2000-327719 discloses that plastomers having a Q value of 1.5 to 5.0 and a composition distribution parameter of 2.00 or less include polymethyl methacrylate particles as an antiblocking agent. Is blown up at a blow-up ratio of 2 to 4 and a frost line of 100 to 700 mm to form a resin composition having a blocking value of 80 to 240 g / cm ² and a haze ( (Haze) of 4.5 to 10.5%.

[0010] JP-A-10-29255, JP-A-10-29255
Even the plastomer film described in JP-A-000-327719 has a blocking value of 80 g / cm ² or more, and there is still room for improvement. The addition of an anti-blocking agent improves the heat seal temperature by 2 to 8 ° C.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide an ethylene resin film which is excellent in anti-blocking properties, low-temperature heat-sealing properties, film feeding / discharging properties and high gloss. Another object of the present invention is to provide production of an ethylene-based resin film having such excellent performance.

[0012]

According to the present invention, there is provided a metallocene catalyst comprising ethylene as a main component and having 3 carbon atoms.
Vinyl monomers -22～8 weight density obtained with 20 of the α- olefin as minor component is having a straight chain linear low density polyethylene and ethylene from 78 to 92 wt% and a polar group 0.880~0.915g / cm ³ % Of an ethylene-based resin film obtained by extruding an ethylene-based resin selected from ethylene copolymers having a density of 0.880 to 0.910 g / cm ³ obtained by copolymerizing The film provides an ethylene resin film characterized by satisfying the following physical properties. A) Coefficient of longitudinal dynamic friction between film surfaces (JIS K
-7125) is 0.18 to 0.50, and the longitudinal dynamic friction coefficient between the film back surfaces is 1.0 or more. B) The film surface and film surface, the film back surface and film back surface, and the film surface and film back surface are superposed. The measured blocking was 0 g / 10 cm in all cases.
² .

Since the blocking value is 0 g / 10 cm ² , the bag formed from the film can be easily opened. Further, when the film is wound and stored, and the film is rewound during the bag manufacturing time or the laminating time, there is no blocking, so that the rewound is easy. Further, by setting the side having a dynamic friction coefficient (JIS K-7125) of 0.18 to 0.50 as the inner layer of the bag and the side having a coefficient of dynamic friction of 1.0 or more as the outer layer of the bag, the low-temperature heat-sealing is achieved. It is easy to perform automatic filling and packaging, and is excellent in loading capacity of filling bags. Therefore, when transporting the filling bag or at the point of sale,
There is no collapse of the filling bag. Furthermore, when used as an in-mold label (Japanese Patent Application Laid-Open No. 9-207166), there is no blocking of labels during stacking of labels, so there is no mistake in receiving labels when receiving them with a label adsorber (the conventional label has one of the above problems). There were about 1 to 3 mistakes in the receipt per million.)

A second aspect of the present invention is characterized in that the ethylene resin film further satisfies the following physical properties. C) The surface roughness (JIS B-0601) of the film is as follows: C ₁ ) The arithmetic average roughness (R _a ) is 0.
8 to 1.5 μm, 0.03 to 0.12 on the back side of the film
[mu] m, _{C 2)} maximum height _{(R y)} is 5.0 to the film surface side
8.0 μm, 0.2-0.8 μm on the back side of the film, C ₃ ) Ten-point average roughness (R _z ) on the front side of the film.
0 to 6.0 μm, 0.2 to 0.5 μm on the back side of the film
m, D) The glossiness (JIS Z-8741: measured at 60 degrees) is 100% or more on the back surface of the film. E) The haze of the film (ASTM D-1003) is 5
４０40%.

The physical properties C) are one condition for satisfying the physical properties A) and B). In addition, the dynamic friction coefficient (J
By setting the back surface of the film having IS K-7125) of 1.0 or more to the outside at the time of bag formation, a bag with high gloss can be obtained. Further, a metal plate, printing paper, stone, or the like, which is laminated on the film surface side having a coefficient of dynamic friction of 0.18 to 0.50,
The film surface is melted, the mat disappears, and the transparency of the film material is reduced by applying pressure to the film with a heating roll or a press machine. (Degree of 3-12%) is presented. Similarly, when used as an in-mold label, the label is fixed in the mold so that the back side of the film having a dynamic friction coefficient of 1.0 or more is in contact with the mold wall, so that the label is completely fixed to the mold wall. Will be In addition, when the resin container to which the label is attached by injection molding, blow molding, or differential pressure molding is subjected to in-mold molding, the air escape between the label and the resin container is prevented because the mat-like surface is rough. Easy and does not produce orange peel. In addition, since the label exhibits translucency (hazyness of 3 to 12%) of the film material since it is translucent, the amount and color of the contents filled in the transparent resin container can be seen through the label.

A third aspect of the present invention is to buff the rotating chrome-plated mirror surface metal chill roll or the surface of the mirror surface metal chill roll with an ethylene resin film melt-extruded from a T-die. The surface of the metal chill roll, which has been finished to a super-mirror surface, is further subjected to a sand-blasted semi-matte-like metal chill roll (a) of number 120 to 150, and rotating fine particles having a particle size of 110 to 220 μm.
The rubber roll is guided between the mat-like rubber roll (b) contained at a ratio of about 55% by weight and cooled while being pressed. A) The side in contact with the mat-like rubber roll (b) The longitudinal dynamic friction coefficient between the film surfaces (JIS K-7125) is 0.18 to 0.50, and the longitudinal dynamic friction coefficient between the film back surfaces in contact with the metal chill roll (a) is 1.0 or more; B) The blocking measured by superimposing the film surface and the film surface, the film back surface and the film back surface and the film surface and the film back surface was 0 g / 10 cm.
^2, there is provided a method for producing ethylene-based resin film is.

The above-mentioned mirror-surface metal chill roll or semi-mat-like metal chill roll (a) and mat-like rubber roll (b)
The anti-blocking agent need not be blended with the ethylene-based resin by using in combination with the resin, and the blocking value is 0 g / 10 cm ^2.
Can be produced.

A fourth aspect of the present invention is to rotate a laminated film of an ethylene resin film melt-extruded from a co-extrusion T-die and a thermoplastic resin film having a melting point higher than the melting point of the ethylene resin by 20 ° C. or more. Chrome-plated mirror-surface metal chill rolls or semi-matte-like metal chill rolls whose surface is further buff-finished to a super-mirror finish and the surface of the metal chill rolls is further sandblasted with No. 120-150. (A), and rotating fine particles having a particle size of 110 to 220 μm to 20 to 55 μm.
The ethylene-based resin film layer side has a mat-like rubber roll between the mat-like rubber roll (b) and the rubber-like rubber roll (b).
(A) The thermoplastic resin film is guided so as to be in contact with the mirror-finished metal chill roll or semi-mat-like metal chill roll (a), and cooled while being pressed. The longitudinal dynamic friction coefficient (JIS K-7125) of the film surfaces on the side in contact with the rubber roll (b) is 0.18 to 0.50, and the vertical length of the film back surfaces in contact with the metal chill roll (a) is The coefficient of directional dynamic friction is 1.0 or more. B) The blocking measured by overlapping the film surface with the film surface, the film back surface with the film back surface, and the film surface with the film back surface is 0 g / 10 cm.
^2. It is intended to provide a method for producing an ethylene-based resin laminated film, which is:

When the laminated film is manufactured, the ethylene resin film which is to be a heat seal layer is guided so as to be in contact with the mat-like rubber roll (b), and the surface of the ethylene resin film is matt-finished. The resin film side is guided so as to be in contact with a mirror surface having a surface roughness of 0.5 μm or less or a semi-matte metal chill roll (a), and the high melting point resin film which is the outer layer of the bag or the laminate film is made highly glossy.

According to a fifth aspect of the present invention, the ethylene resin laminated film obtained by the above method further satisfies the following physical properties. C) Surface roughness of laminated film (JIS B-0601)
C ₁ ) The arithmetic average roughness (R _a ) is 0.8 to 1.5 μm on the ethylene resin film surface side, 0.03 to 0.12 μm on the thermoplastic resin film surface side, and C ₂ ) the maximum height (R _y ) is 5.0 to 8.0 μm on the ethylene resin film surface side and 0.2 to 8.0 μm on the film rear surface side.
0.8 μm, C ₃ ) Ten-point average roughness (R _z ) of 3.0 to 6.0 μm on the ethylene resin film surface side, 0.2 to 0.5 μm on the thermoplastic resin film surface side, D) The glossiness (JIS Z-8741: measured at 60 degrees) is 100% or more on the thermoplastic resin film surface side. E) The haze degree of the laminated film (ASTM D-1003)
F) The thickness of the laminated film is 8 to 300 μm, and the thickness of the ethylene resin film forming the heat seal layer is:
0.5 to 10 μm.

In order to improve the toughness of the ethylene resin film, a high melting point resin such as polypropylene or nylon is laminated.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a production process of an ethylene-based resin film. In the figure, 1 is a T-die, 2 is a molten ethylene-based resin film, 3 is a mirror glossy or semi-matte finished metal chill roll, 4 is a matt rubber roll, 4a is a cooling water passage, 4b is a hollow stainless steel tube, 4c Is a heat-resistant rubber base material, 4d is a rubber coat film made of an inorganic fine powder-containing polysiloxane or propylene hexafluoride / vinylidene fluoride copolymer, 5 is a cooling roll, 6, 7, 7, 8, and 8 are Guide row
Reference numerals 9, 9 are corona discharge treatment devices.

As the metallocene ethylene resin of the film material, one or two or more α-olefins having 3 to 20, preferably 4 to 12 carbon atoms containing ethylene as a main component using a metallocene catalyst are used as auxiliary components. copolymerized density obtained is 0.880~0.915g / cm ³ of the metallocene LLDPE or plastomers as - a straight-chain linear low-density polyethylene referred to, for example, of Japan Polychem Corporation Ca - channel KF360, KF370, KC5705 (product Name), Ube Industries' Yumerit 0540F,
022GS (trade name), Evolu of Mitsui Chemicals, Inc.
SP0540 (trade name) and Sumikasen FV401 (trade name) manufactured by Sumitomo Chemical Co., Ltd. The melt flow rate of these plastomers (JIS K-721)
0: 190 ° C, 2.16 kgf load) is 1.0 to 10
g / 10 minutes, preferably 2 to 5 g / 10 minutes.

Examples of the α-olefin include propylene, butene-1, hexene-1, pentene-1, octene-1, 4-methylpentene-1, decene-1, docadeceneno and the like.

A method for producing polyethylene by polymerizing ethylene and an α-olefin using a metallocene catalyst is as follows.
As described in International Patent Publication WO92 / 01723, a catalyst comprising a metallocene compound and a compound which reacts with the metallocene compound to form a stable anion is used. -Copolymerization with 2 to 60% by weight of olefin. As the catalyst, a metallocene-alumoxane catalyst is particularly preferable.

As the metallocene compound,

MLx (where M is Zr, Ti, Hf, Nb, Ta and Cr
L is a ligand coordinated to the transition metal, at least one ligand having a cyclopentadienyl skeleton, and a ligand other than the cyclopentadienyl skeleton. The ligand L is a hydrocarbon group having 1 to 12 carbon atoms, an alkoxy group, an aryloxy group, a trialkylsilyl group, a SO ₃ R group, a halogen atom or a hydrogen atom, and x is a valence of a transition metal. .

The compound which reacts with the metallocene compound to form a stable anion is an ionic compound or an electrophilic compound formed from an ion pair of a cation and an anion.

Embedded image [Q] ^{m +} [Y] ^m− (wherein, Q is a cation component of an ionic compound, and examples thereof include a carbonium cation, a tropylium cation, an ammonium cation, a sulfonium cation, and a phosphonium cation. And Y are anionic components of an ionic compound, such as an organic boron compound anion, an organic aluminum compound anion, an organic gallium compound anion, an organic phosphorus compound anion, an organic arsenic compound anion, and an organic antimony compound anion.

[0028] Other ethylene resins are ethylene 78-
The density obtained by copolymerizing 92% by weight of a vinyl monomer having a polar group and 22 to 8% by weight is 0.880 to 0.9.
10 g / cm ³ of ethylene copolymer, for example, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / methyl acrylate copolymer, ethylene /
Ethyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene / ethyl methacrylate copolymer, ethylene / butyl acrylate copolymer, ionomer and the like.

The film structure is a monolayer of these ethylene-based resins: a laminate of ethylene-based resins of different composition, for example, a linear polyethylene / plastomer laminate during Ziegler-catalyzed polymerization, ethylene / last Vinyl copolymer / plastomer laminate: laminate of an ethylene-based resin layer and another transparent high-melting thermoplastic resin layer, for example, nylon 6 /
Plastomer laminate, polypropylene / plastomer laminate, polyethylene terephthalate / plastomer laminate, propylene / ethylene copolymer / plastomer laminate, polypropylene / plastomer laminate, polycarbonate / plastomer Laminates, saponified ethylene / vinyl acetate copolymer / plastomer laminates, and the like.

When the difference in melting point between the high melting point resin and the ethylene resin is 20 ° C. or more, preferably 35 ° C. or more, the low-temperature heat sealability can be exhibited. The thickness of the laminated film is
The thickness of the ethylene resin film forming the heat seal layer is 8 to 300 μm, and the thickness is 0.5 to 10 μm. In the film material, if necessary, 0.3 to 1% by weight of the antistatic agent based on the resin. 0.5 to 1.5% by weight of an antioxidant is incorporated. The anti-blocking agent and the lubricant may not be blended, but may be blended at 600 ppm or less which does not lower the transparency. Fine particles such as silica, aluminosilicate, talc, alumina, calcium carbonate, kaolin, and polymethyl methacrylate are used as antiblocking agents, and erucamide, ethylene oleamide, ethylene bisstearic acid are used as lubricants. And methylenebispalmitic acid amide.

When the film has a laminated structure, the mat-like rubber roll is so arranged that the side in contact with the mirror surface or semi-matte-like metal chill roll 3 becomes the resin layer side having a high melting point.
The film is extruded from the co-extrusion T-die so that the side in contact with the shell 4 is the ethylene resin layer side.

The mirror or semi-matte metal chill roll (casting drum) 3 is, for example, chrome-plated on the surface of a stainless steel drum, and buff-finished the chrome-plated surface to give a 0.1-0.2S super-mirror surface. The metal chill roll or the surface of the metal chill roll is further
It can be obtained by sandblasting No. 0 to 150 (dry method). The surface roughness of the metal chill roll and the semi-matte metal roll is 0.5 μm or less. Rotating semi-matte metal cirro during film production
The temperature of the reactor 3 is maintained at a constant temperature of 10 to 40C. The diameter of the semi-matte metal chill roll 3 varies depending on the resin used, but is generally 500 to 1200 mm and the width is 400 to 2 mm.
000 mm.

The mat-like rubber roll 4 is formed, for example, by forming a polysilicon rubber roll rubber base material 4c having a rubber hardness of 3 to 5 mm and a rubber hardness of 60 to 80 outside a cast iron pipe or a stainless steel pipe 4b forming a cooling water passage 4a. On the surface of the base material, fine and fine particles (e.g., silica sand,
(Aluminum powder, silicate glass powder) containing 20 to 55% by weight of a polysiloxane or a rubber coating agent made of propylene hexafluoride / vinylidene fluoride copolymer having a thickness of 2 to 8 mm is applied and cured to give a matte coat. It is prepared by providing a layer 4d. In addition, without providing the base material 4c, a polysiloxane having a thickness of 8 to 15 mm containing 20 to 55% by weight of fine particles having a particle size of 110 to 220 μm or a propylene hexafluoride / vinylidene fluoride containing 20 to 55% by weight is provided on the tube 4b. A rubber mat coat layer 4d made of a polymer may be provided.

The particle size of the matte coat layer 4d is 1
Part of the fine particles having a particle size of 10 to 220 μm (30% by weight or less) may be replaced with inorganic fine particles having a particle size of 5 to 40 μm (for example, talc or clay). Particle size is 5 to 40 μm
The mixing ratio of the inorganic fine particles of the formula (1) to the fine particles having a particle size of 110 to 220 μm is preferably a weight ratio of 1: 2 to 1: 5.

The rotating cooling roll 5 (temperature 5 to 15 ° C.) so that the temperature of the rotating mat-like rubber roll 4 during film production is maintained at a constant temperature of 10 to 40 ° C.
Is pressed against the back of the mat-like rubber roll 4 to cool the mat-like rubber roll 4.

The diameter of the mat-like rubber roll 4 varies depending on the resin used, but is generally 250 to 600 mm and the width is 400 to 2000 mm.

As shown in FIG. 1, an ethylene-based resin film or an ethylene-based resin laminated film is melt-extruded from a T-die (co-extrusion T-die) 1 and melted. Then, it is guided between the mirror surface or semi-matte-like metal chill roll 3 and the mat-like rubber roll 4, cooled while being pressed, and subjected to corona discharge treatment by guide rolls 6, 7, 7, 8, 8 and 8. Vessel 9,
9 and is manufactured by oxidizing the surface one by one.

An oxidation treatment such as corona discharge activates the surface of the film and improves the adhesion of the printing ink in post-processing. Further, the adhesiveness of the laminate to the printing paper by the heating press is improved.

The physical properties of the ethylene resin film thus obtained are as follows: A) The coefficient of longitudinal dynamic friction (JIS K-7125) between the film surfaces (the side in contact with the rubber roll) is 0.18 to less.
0.50, longitudinal static friction coefficient (JIS K-7125)
Is 0.18 to 0.50, and the longitudinal dynamic friction coefficient between the back surfaces of the films (the side in contact with the metal chill roll) is 1.0 or more, and the longitudinal static friction coefficient is 1.0 or more. B) Film surface and film surface , The blocking measured when the film backside and the film backside and the film frontside and the film backside were superimposed were all 0 g / 10 cm.
² ,

C) Surface roughness of the film (JIS B-0)
601) indicates that the C ₁ ) arithmetic mean roughness (R _a ) is 0. 0 on the film surface side.
8 to 1.5 μm, 0.03 to 0.12 on the back side of the film
μm, C ₂ ) The maximum height (R _y ) is 5.0 to 5.0 on the film surface side.
8.0 .mu.m, 0.2 to 0.8 [mu] m in film backside, _{C 3)} ten-point average roughness _{(R z)} is 3 the film surface side.
0 to 6.0 μm, 0.2 to 0.5 μm on the back side of the film
m) D) Gloss (JIS Z-8741: measured at 60 degrees) is 100% or more on the back surface of the film. E) Haze of the film (ASTM D-1003) is 1
5% to 50%. Is satisfied.

The thickness of the film is 8 to 300 μm, and varies depending on the use. 8-100 μm for bags, Lamine
For example, the thickness is 40 to 300 μm, and for an in-mold label, it is 100 to 300 μm. The thickness of the high melting point resin layer is 2
It is about 0 to 200 μm. The layer structure may be an ethylene-based resin single layer or a two- to seven-layer structure of an ethylene-based resin layer and another resin layer.

[0042]

The present invention will be described in more detail with reference to the following examples. Example 1 Semi-matte metal chill roll 3: A 100 μm-thick chromium plating was applied to the surface of a stainless steel drum, and the chrome-plated surface was buff-finished to obtain a 0.1S ultra-mirror surface. Surface roughness (JIS) obtained by sandblasting (dry method)
B-0601), the arithmetic average roughness (R _a ) is 0.05 μm, and the maximum average roughness (R _a max) is 0.05 μm.
Of a semi-matte metal chill roll having a diameter of 600 mm and a width of 1500 mm (temperature of about 15 ° C.) having a diameter of 0.9 μm and a ten-point average roughness (R _z ) of 0.7 μm.

Matte rubber roll 4: A 3 mm polysilicon rubber roll base layer 4c having a rubber hardness of 70 is provided outside the cast iron pipe 4b, and talc having a particle size of 12 μm and a particle size are formed on the base layer. Is 110 μm silica sand at a weight ratio of 1: 2.7.
An organic polysiloxane coating agent containing 5% by weight was applied and cured to form a cured film 4d having a thickness of 5 mm.
A mat-like rubber roll having a diameter of 300 mm and a width of 1500 mm was used.

Cooling metal roll 5: diameter 300 mm, width 1
A 500 mm stainless steel cooling roll (temperature about 13 ° C.) was used. Metallocene plastomer-2: Metallocene low-density polyethylene "Kernel KF370" from Nippon Polychem Co., Ltd.
(Product name: density 0.905 g / cm ³ , melt flow
(3.5 g / 10 min).

Production of film: Using the production apparatus shown in FIG.
The mixture is melted and kneaded at 0 ° C., supplied to the T-die 1, guided between the semi-mat-like metal chill roll 3 and the mat-like rubber roll 4, and subjected to pinching (linear pressure: about 1.5 kg / cm). This was guided to corona discharge treatment devices 9 and 9 by guide rolls 6, 7, 7, 8 and 8, and the surfaces of each side were reduced to 40 w / m ^2.
After a corona discharge treatment for minutes, the ears were cut off, and then wound up by a winder to obtain a film having a thickness of 50 μm.

The haze of this film was 28%, and the gloss was 108% on the film surface in contact with the semi-matte metal chill roll, and the film surface (the side in contact with the rubber roll).
The coefficient of dynamic friction between each other in the vertical direction (film feed direction) is 0.2
8. The coefficient of longitudinal static friction is 0.29, the coefficient of longitudinal dynamic friction between the film back sides (the side in contact with the semi-mat-like metal chill roll) exceeds 1, the coefficient of longitudinal static friction also exceeds 1, and the surface roughness of the film According to (JIS B-0601), the arithmetic average roughness (R _a ) is 1.15 μm on the film front side, 0.11 μm on the film rear side, and Ramax is 1.769 μm on the film front side and 0. 138μ
m, the maximum height (R _y ) is 7.37 μm on the film surface side
m, 0.59 μm on the back side of the film, ten-point average roughness (R
_z ) was 4.7 μm on the film front side and 0.39 μm on the film back side. In addition, width 2cm, length 10c
m film as a test piece, a 5 cm length portion was overlapped, and 50 g / unit area
cm ² in a gear oven at 40 ° C.
After allowing the film to stand and adhere for a period of time, the blocking value representing the load per unit area of 10 cm ² required for peeling (measured in a constant temperature chamber at 23 ° C. and 55% relative humidity) in the state of the ^two films is the film The front surface and the film front surface, the film back surface and the film back surface, and the film front and the film back surface were superimposed, and all were 0 g / 10 cm ² . The bag obtained by folding this film and heat-sealing both ends at 90 ° C. (heat-sealing strength: 320 g / 15 mm width) was easy to open.

Example 2 In Example 1, an ethylene / vinyl acetate copolymer Novatec LV340 (trade name: ethylene content: 90% by weight, MFR: 3.5 g) was used in place of the metallocene plastomer. / 10 min), and an ethylene / vinyl acetate copolymer film having a thickness of 50 μm was obtained in the same manner except that the extrusion temperature was changed to 190 ° C.

The haze of this film was 22%, and the gloss was 112% on the film surface in contact with the semi-matte metal chill roll, and the film surface (the side in contact with the rubber roll).
The longitudinal (film feed direction) dynamic friction coefficient between each other is 0.3
0, the longitudinal static friction coefficient is 0.35, the longitudinal dynamic friction coefficient between the film back sides (the side in contact with the semi-matte metal chill roll) exceeds 1, the longitudinal static friction coefficient also exceeds 1, and the film surface roughness According to (JIS B-0601), the arithmetic average roughness (R _a ) is 1.17 μm on the front side of the film, 0.11 μm on the back side of the film, and Ramax is 1.772 μm on the front side of the film; 141μ
m, the maximum height _{(R y)} is, 7.41Myu the film surface side
m, 0.61 μm on the back side of the film, ten-point average roughness (R
_z ) was 4.8 μm on the film front side and 0.40 μm on the film back side. In addition, the blocking measured by superimposing the film surface and the film surface, the film back surface and the film back surface, and the film surface and the film back surface was 0 g / 10 cm ² . The bag obtained by folding the film and heat sealing both ends at 90 ° C. was easy to open.

Example 3 In Example 1, instead of the semi-matte metal chill roll 3, a 100 μm-thick chrome plating was applied to the surface of a stainless steel drum which was not subjected to a semi-mat treatment, and the chrome-plated surface was buffed. A metallocene polyethylene resin film having a thickness of 50 μm was obtained in the same manner except that a metal chill roll finished to a 0.1S super mirror surface was used.

This film had a haze of 26% and a gloss of 114 on the film surface in contact with the metal chill roll.
%, The coefficient of dynamic friction between the film surfaces (the side in contact with the rubber roll) in the vertical direction (the film feed direction) is 0.29, the coefficient of static friction in the vertical direction is 0.31, and the back side of the film (the side in contact with the metal chill roll) The coefficient of longitudinal dynamic friction between them exceeds 1, the coefficient of longitudinal static friction also exceeds 1, and the surface roughness of the film (JIS
B-0601) has an arithmetic average roughness (R _a ) of 1.16 μm on the film front side and 0.08 μm on the film back side.
m, Ramax are 1.773 μm on the film front side, 0.107 μm on the film back side, and the maximum height (R _y ) is
7.42 μm on the front side of the film and 0. 42 on the back side of the film.
The ten-point average roughness (R _z ) was 4.8 μm on the film front side and 0.39 μm on the film back side.
In addition, the blocking measured by superimposing the film surface and the film surface, the film back surface and the film back surface, and the film surface and the film back surface were all 0 g / 10c.
It was m ^2. Bend this film, both ends 90 ° C
The opening of the bag obtained by heat-sealing was easy.

Reference Example 1 A metallocene polyethylene resin film having a thickness of 50 μm was obtained in the same manner as in Comparative Example 1, except that 600 ppm of a blocking inhibitor was added to the metallocene low-density polyethylene used in Example 1 as the metallocene low-density polyethylene. Was. The haze of this film was 34%.

Example 4 Nylon 6 and the metallocene low density polyethylene used in Example 1 were used as the laminated resin film material to be molded.
Nylon 6 is melt-kneaded at 300 ° C by an extruder, and metallocene low-density polyethylene is melt-kneaded at 250 ° C by another extruder. These are guided to one co-extrusion T-die, laminated, and co-extruded. Nylon 6 (45 μm thick) in the same manner as in Example 1 except that it is extruded into a film form from a T-die (the nylon 6 side is in contact with the semi-matte metal chill roll).
/ Metallocene low-density polyethylene (thickness: 5 μm) having a two-layer structure.

The haze of this film is 11%, the gloss is 105% on the film surface in contact with the semi-matte-colored metal chill roll, and the longitudinal direction (the side in contact with the plastomer film (the side in contact with the rubber roll)). Film feed direction) Dynamic friction coefficient is 0.28, longitudinal static friction coefficient is 0.28, longitudinal dynamic friction coefficient between nylon film back sides (side in contact with metal chill roll) exceeds 1, and longitudinal static friction coefficient is also 1. And the surface roughness (JIS B-0601) of the film is
The arithmetic average roughness (R _a ) is 1.16 μm on the plastomer film front side and 0.08 μm on the nylon film rear side.
m and Ramax are 1.770 μm on the film front side, 0.138 μm on the film back side, and the maximum height (R _y ) is
7.38 μm on the film front side, 0.3 mm on the film back side.
The 10-point average roughness (R _z ) was 4.8 μm on the film front side and 0.39 μm on the film back side.
In addition, the blocking measured by superimposing the film surface and the film surface, the film back surface and the film back surface, and the film surface and the film back surface were all 0 g / 10c.
It was m ^2. This laminated film is folded in two so that the plastomer film side forms an inner surface, and both ends are 90 ° C.
The opening of the bag obtained by heat-sealing was easy.

Comparative Example 1 In Example 1, a cast iron pipe 4 was used as the mirror-finished rubber roll 4.
talc with a particle size of 12 μm and a particle size of 110 μm outside b
A silicon rubber roll underlayer 4c having a thickness of 5 mm and a rubber hardness of 70 containing 35% by weight of silica sand at a weight ratio of 1: 2.7 is provided, and the surface thereof is buffed, followed by sand blasting of No. 240. after organopolysiloxane co - DOO agent was applied, to form a cured film 4d of the cured allowed to 2mm thickness, the arithmetic average roughness _{(R a)} is 0.05 .mu.m, the maximum average roughness _(R a max) Is 0.2 μm and the ten-point average roughness (R
_z ) A linear linear low-density polyethylene (MFR 2.0 g / 10 min.) polymerized using a mirror rubber roll having a diameter of 300 mm and a width of 1500 mm having a diameter of 0.3 μm and using a Ziegler catalyst instead of a plastomer. , Density 0.918
g / cm ³ ), and an LLDPE film having a thickness of 50 μm was obtained in the same manner except that a mixture of 600 ppm of silica spherical particles as an antiblocking agent was used.

The haze of this film was 11%, the gloss was 108% on the film surface in contact with the matte metal chill roll, 104% on the film back surface in contact with the mirror-finished rubber roll, and the film surfaces were Has a coefficient of longitudinal kinetic friction of 0.36, and the coefficient of kinetic friction between the backs of the films is 0.
31, Film surface roughness (JIS B-0601)
Means that the arithmetic average roughness (R _a ) is 0.0
8 μm, 0.06 μm on the back side of the film, maximum height (R
_y ) is 0.44 μm on the film front side, 0.38 μm on the film back side, and the ten-point average roughness (R _z ) is 0.32 μm on the film front side and 0.25 μm on the film back side.
Met. The blocking property between the film surfaces was 250 g / 10 cm ² . This laminated film is folded in half so that the plastomer film side forms the inner surface, and both ends are heat-sealed at 120 ° C. (heat-sealing strength is 305 g / 15 mm width). It was easy.

Example 5 As a laminated resin film material to be molded, 90 parts by weight of a propylene homopolymer having an MFR of 4.2 g / 10 min and an ethylene / vinyl acetate copolymer (ethylene content: 90% by weight, MFR Is 8 g / 10 min) and a mixture with 10 parts by weight, for the surface layer, Plastomer kernel KF360 (trade name: MFR 3.5 g) of Nippon Polychem Co., Ltd.
/ 10 min, density 0.898 g / cm ³ ), the mixture for the back layer is melt-kneaded at 240 ° C. by an extruder, and the plastomer for the surface layer is melt-kneaded at 220 ° C. by another extruder, These were guided to a single co-extrusion T-die, laminated, and extruded into a film form from the co-extrusion T-die (the mixture layer side for the back layer was in contact with the semi-matte metal chill roll) in the same manner as in Example 1. And the mixture layer (200 μm thickness) /
A two-layer film of metallocene low-density polyethylene (thickness: 10 μm) was obtained. This is 35mm long and 50mm wide
To obtain an in-mold label.

The physical properties of this film are as follows:
The gloss was 118% for the mixture layer on the back surface, the coefficient of dynamic friction between the plastomer film surfaces in the longitudinal direction (film feeding direction) was 0.29, the coefficient of static friction in the longitudinal direction was 0.33, and the back surface of the film was in contact with the metal chill roll. Side), the longitudinal dynamic friction coefficient exceeds 1, the longitudinal static friction coefficient also exceeds 1, and the surface roughness (JIS B-0601) of the film is such that the arithmetic average roughness ( _Ra ) is the plastomer film surface side. At 1.14μ
m, 0.07 μm on the film back side, Ramax 1.785 μm on the film front side, 0.1 on the film back side
The maximum height (R _y ) is 33 μm on the film surface side.
12 [mu] m, 0.54 .mu.m in the film backside, ten-point average roughness _{(R z)} was the 0.35μm in film surface side 4.7 [mu] m, the film backside. In addition, the blocking measured by superimposing the film surface and the film surface, the film back surface and the film back surface, and the film surface and the film back surface was 0 g / 10 cm ² .

The label was transferred using a label filling tool of Placo Co., Ltd. so that the mixture layer side was in contact with the cavity wall of the 1-liter blow molding die, and then fixed to the die wall by vacuum and extruded. A parison of a propylene homopolymer (MFR 1.0 g / 10 min) was melt-extruded at 230 ° C. from the press, then the mold was closed, and 3.2 k in the parison.
The parison was expanded by supplying compressed air of g / cm ² to make the parison into a container shape, and a label was fused to the surface of the container to obtain a label-attached hollow container. The transparency of the attached label was improved (the degree of haze was reduced).

[0059]

The ethylene-based resin film of the present invention is excellent in low-temperature heat sealability and anti-blocking property, and thus is suitable for a material for a bag for filling and packaging. Further, since a bag having excellent loadability is provided, it is also useful as a stretch packaging film and a garbage bag. In particular, for local governments that require transparent or translucent bags as garbage bags, such as Yokohama City, Kanagawa Prefecture, large amounts of fillers such as calcium carbonate (15-30
(% By weight), a semi-transparent film can be obtained by processing an ethylene-type resin film into a matte tone with a mat-like rubber roll, so that the conventional film forming site is contaminated with filler. There is no. Also, during lamination or in-mold molding, the unevenness of the film mat surface becomes an air escape path between the film and the metal plate, rigid resin plate or blow container to be adhered. There is no air pocket (blister) or orange peel.

[Brief description of the drawings]

FIG. 1 is a process chart for producing an ethylene-based resin film.

[Description of Signs] 1 T-die 2 Resin film 3 Semi-matte-like metal chill roll 4 Matte-like rubber roll 5 Cooling roll 9 Corona discharge treatment machine

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 7:00 B29L 7:00 C08L 23:04 C08L 23:04 F term (Reference) 4F071 AA18 AA19 AA28X AA32X AA33X AF32.

Claims (5)

[Claims] 1. A linear linear low density having a density of 0.880 to 0.915 g / cm ³ obtained by using a metallocene catalyst and comprising ethylene as a main component and an α-olefin having 3 to 20 carbon atoms as a subsidiary component. Polyethylene and ethylene 78-9
The density obtained by copolymerizing 2% by weight and 22 to 8% by weight of a vinyl monomer having a polar group is 0.880 to 0.91.
An ethylene resin film obtained by extruding an ethylene resin selected from 0 g / cm ³ ethylene copolymer, wherein the film satisfies the following physical properties: . A) Coefficient of longitudinal dynamic friction between film surfaces (JIS K
-7125) is 0.18 to 0.50, and the longitudinal dynamic friction coefficient between the film back surfaces is 1.0 or more. B) The film surface and film surface, the film back surface and film back surface, and the film surface and film back surface are superposed. The measured blocking was 0 g / 10 cm in all cases.
^{2. An} ethylene-based resin film, characterized in that: 2. The ethylene resin film according to claim 1, wherein the ethylene resin film further satisfies the following physical properties. C) The surface roughness (JIS B-0601) of the film is as follows: C ₁ ) The arithmetic average roughness (R _a ) is 0.
8 to 1.5 μm, 0.03 to 0.12 on the back side of the film
μm, C ₂ ) The maximum height (R _y ) is 5.0 to 5.0 on the film surface side.
8.0 μm, 0.2-0.8 μm on the back side of the film, C ₃ ) Ten-point average roughness (R _z ) on the front side of the film.
0 to 6.0 μm, 0.2 to 0.5 μm on the back side of the film
m) D) Gloss (JIS Z-8741: measured at 60 degrees) is 100% or more on the back surface of the film. E) Haze of the film (ASTM D-1003) is 1
5% to 50%. 3. An ethylene resin film melt-extruded from a T-die is turned into a super mirror-finished surface by buffing the rotating chrome-plated mirror-surface metal chill roll or the surface of the mirror-surface metal chill roll. A semi-mat-like metal chill roll (a) in which the surface of the metal chill roll is further sandblasted with a number 120 to 150;
A mat-type rubber roll (b) containing fine particles of 10 to 220 μm in a proportion of 20 to 55% by weight,
A) The film is cooled while being pinched. A) The coefficient of longitudinal dynamic friction (JIS K-7125) between the film surfaces on the side in contact with the mat-like rubber roll (b) is 0.18 to 0.50, The longitudinal dynamic friction coefficient between the film back surfaces in contact with the metal chill roll (a) is 1.0 or more; B) blocking measured by superposing the film surface on the film surface, the film back surface on the film back surface, and the film surface on the film back surface; But all are 0g / 10cm
^{2. A} method for producing an ethylene-based resin film, which is: 4. A rotating chrome-plated laminated film of an ethylene resin film melt-extruded from a co-extrusion T-die and a thermoplastic resin film having a melting point higher than the melting point of the ethylene resin by 20 ° C. or more. The mirror-surface metal chill roll or the mirror-finished metal chill roll is buffed and the mirror surface metal chill roll is finished to a super-mirror surface.
No. 20-150 sand blasted semi-matte metal chill roll (a), and rotating particle size of 110-110
An ethylene-based resin film layer side is in contact with the mat-like rubber roll (b) side between the mat-type rubber roll (b) containing 220 μm fine particles at a ratio of 20 to 55% by weight;
The thermoplastic resin film side is guided so as to be in contact with the mirror-surface metal chill roll or the semi-mat-like metal chill roll (a) side, and cooled while being pressed. A) It is in contact with the mat-like rubber roll (b). The coefficient of longitudinal dynamic friction (JIS K-7125) between the film surfaces on the side of the film is 0.18 to 0.50, and the coefficient of longitudinal dynamic friction between the film back surfaces in contact with the metal chill roll (a) is 1.0 or more. B) The blocking measured on the film surface to film surface, the film back surface to the film back surface, and the film surface to the film back surface were superimposed on each other.
^{2. A} method for producing an ethylene-based resin laminated film, which is the following. 5. The method for producing an ethylene-based resin laminated film according to claim 4, wherein the ethylene-based resin laminated film further satisfies the following physical properties. C) Surface roughness of laminated film (JIS B-0601)
C ₁ ) The arithmetic average roughness (R _a ) is 0.8 to 1.5 μm on the ethylene resin film surface side, 0.03 to 0.12 μm on the thermoplastic resin film surface side, and C ₂ ) the maximum height is _{(R y)} is 0.2 in ethylene resin film surface 5.0～8.0Myuemu, the film backside
0.8 μm, C ₃ ) Ten-point average roughness (R _z ) of 3.0 to 6.0 μm on the ethylene resin film surface side, 0.2 to 0.5 μm on the thermoplastic resin film surface side, D) The glossiness (JIS Z-8741: measured at 60 degrees) is 100% or more on the thermoplastic resin film surface side. E) The haze degree of the laminated film (ASTM D-1003)
F) The thickness of the laminated film is 8 to 300 μm, and the thickness of the ethylene resin film forming the heat seal layer is:
0.5 to 10 μm.