JP2710409B2 - Resin film and laminate for sack-laden containers - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a resin film and a laminate, and more particularly to a resin film used as an outer surface of a sack container and a laminate including the film.

[Conventional technology]

As a method of manufacturing containers such as paper boxes and envelopes, sack sticking is performed. Sack sticking is to apply an adhesive to the glue part of the base paper having the shape of a container such as a box developed, and to fold the base paper in order to crimp the glue part to a predetermined part, This is a method of manufacturing.

A thermoplastic resin film is laminated on a base paper used for such a sack attachment for the purpose of improving water resistance and oil resistance and imparting gloss. Also, in the case of manufacturing a container having a window portion, a base paper on which a thermoplastic resin film for covering the window portion is laminated is used.

Conventionally, a polyvinyl chloride resin film or a polypropylene resin film has been used as a thermoplastic resin film laminated on a base paper.

[Problems to be solved by the invention]

As the thermoplastic resin film laminated on the base paper used for the sack attachment, transparency and glossiness are required, and at the same time, those that do not impair the sac attachment workability and the adhesiveness of the paste margin are required.

However, a conventionally used polyvinyl chloride resin film is excellent in transparency and glossiness, but has a noticeable fisheye. Therefore, it is unsuitable for the base paper of a container having a window portion. Further, there is much loosening, and dimensional stability is not sufficient. Furthermore, it is inferior in cold resistance and easily cracks in cold weather.

Further, the polypropylene resin film has insufficient transparency and glossiness. Also, the dimensional stability is not sufficient.
Further, depending on the kind of the adhesive for attaching the sack, the margin portion may not show sufficient adhesiveness.

Further, both the polyvinyl chloride resin film and the polypropylene resin film have insufficient antistatic properties and surface slip properties. For this reason, the base paper on which these resin films are laminated has a problem that the workability of attaching the sack is poor and that dust easily adheres.

An object of the first invention is to provide a resin film for a sack-attached container that can simultaneously satisfy transparency, gloss, adhesion, antistatic properties and surface slippage.

An object of the second invention is to provide a laminate for a sack-sticking container provided with the resin film for a sack-sticking container of the first invention.

[Means for solving the problem]

The resin film for a sack container according to the first invention is a resin film used as an outer surface of the sack container, and comprises a polyester film layer and a coating layer laminated on the polyester film layer. The layer is formed by applying a composition constituting a coating layer on a polyester film.

The haze value of the layer in a laminated state is 0.5% or more and 1.3% or more.
% Or less. The coating layer has a static friction coefficient of 0.6 or more.
It is 1.0 or less, the wetting tension is 47 dyne / cm or more and 53 dyne / cm or less, and the surface resistivity is 1.2 × 10 ¹¹ Ω / cm 2 or more and 10 ¹³ Ω / cm 2 or less.

The coating layer contains, for example, a water-soluble or water-dispersible acrylic resin and inorganic inert fine particles as main components.

The coating layer contains, for example, a water-soluble copolyester ether resin and inorganic inert fine particles as main components.

Incidentally, the sack-attached container film according to the present invention, as described in detail in FIGS.
It is used so that the resin film is located on the outer surface of the container.

Resin film An example of the resin film for a sack-attached container of the present invention is as follows.
Shown in the figure. Resin film 1 is polyester film layer 2
Has a configuration in which a coating layer 3 is laminated.

Polyester film layer The polyester resin used for the polyester film layer is a resin containing an ester group obtained by polycondensation of a dicarboxylic acid and a diol. Examples of the dicarboxylic acid include aromatic and aliphatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid and sebacic acid. Examples of the diol include ethylene glycol, butanediol, hexanediol, and neopentyl glycol. The dicarboxylic acids and diols may be used as a mixture of two or more. Polyester resins include polyethylene glycols such as diethylene glycol and triethylene glycol, polyalkylene oxides such as polyethylene oxide,
Further, another monomer or polymer may be copolymerized. The polyester resin may contain various stabilizers, ultraviolet absorbers, lubricants, pigments, antioxidants, plasticizers, antistatic agents, and the like.

The polyester film is manufactured by forming the polyester resin into a film using a known method such as a roll casting method.

The polyester film layer used in the present invention is an unstretched film, a uniaxially stretched film or a biaxially stretched film of the polyester film produced by the above method. In particular, it is desirable to use a biaxially stretched polyester film. The biaxially stretched polyester film is preferably stretched 2.0 to 5.0 times in the vertical axis direction and 2.0 to 5.0 times in the horizontal axis direction. The thickness is 4 to 100 μm, and 6
5050 μm is desirable.

Coating Layer The coating layer used in the present invention is composed of a composition mainly composed of a water-dispersible or water-soluble resin and inorganic inert fine particles.

Examples of the water-dispersible or water-soluble resin include an epoxy resin, a polyamide resin, a cellulose resin, a polyvinyl alcohol, an acrylic resin, a copolyester ether resin, and the like. These water-dispersible or water-soluble resins may be used alone or in combination of two or more. A particularly desirable water-dispersible or water-soluble resin is an acrylic resin or a copolyester ether resin.

Examples of the acrylic resin include those composed of a copolymer resin of an acrylic monomer and an ethylenically unsaturated monomer.

The acrylic monomer is composed of a mixture of the following structural formulas (A) and (B).

Here, R represents hydrogen or a methyl group. Also, R ₁ , R ₂
Is an alkyl group having 1 to 4 carbon atoms and satisfies R ₁ ≦ R ₂ . The acrylic monomers represented by the structural formulas (A) and (B) may be used as a mixture of two or more kinds. In addition, as the acrylic monomer, the acrylic monomer represented by the structural formula (B) is used in an amount of 70 to 95 mol% with respect to the acrylic monomer represented by the structural formula (A). It is desirable to mix 5 mol%.

On the other hand, the ethylenically unsaturated monomer has the following functional group, a group obtained by directly condensing these functional groups, or a group obtained by condensing these functional groups via an aliphatic hydrocarbon. It is directly connected to.

Here, R ₄ and R ₅ represent hydrogen or an alkyl group having 1 to 4 carbon atoms.

The mixing ratio of the acrylic monomer and the ethylenically unsaturated monomer constituting the acrylic resin is such that the acrylic monomer is 80.0 to 99.9 mol% and the ethylenically unsaturated monomer is 20.0%. It is desirably about 0.1 mol%.

When a copolyester ether resin is used as the water-dispersible or water-soluble resin, the acid component may be either an aromatic dicarboxylic acid or a non-aromatic dicarboxylic acid. Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, 2,5-dimethylterephthalic acid, 1,4-naphthalenedicarboxylic acid, and 2,6-
Naphthalenedicarboxylic acid, biphenyldicarboxylic acid, 1,
2-bis (phenoxy) ethane-p, p'-dicarboxylic acid and their ester-forming derivatives are used. Non-aromatic dicarboxylic acids include, for example, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, 1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and their ester-forming properties. Derivatives and the like are used.

Examples of the ester-forming derivative used for the dicarboxylic acid component include an alkali metal sulfonic acid compound. Examples of the sulfonic acid alkali metal salt compound include sulfoterephthalic acid, 5-sulfoisophthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, sulfo-p-xylene glycol, 2-sulfo-1, Examples thereof include alkali metal salts of sulfonic acids such as 4-bis (hydroxyethoxy) benzene and ester-forming derivatives thereof. In particular, it is desirable to use a sodium salt of 5-sulfoisophthalic acid, a sodium salt of sulfoterephthalic acid, and an ester-forming derivative thereof. It is desirable that these ester-forming sulfonic acid alkali metal salt compounds be contained in an amount of 1 to 40 mol%, more preferably 10 to 20 mol%, based on all dicarboxylic acid components. If the content is less than 1 mol%, the water solubility and coating properties of the copolyester ether resin may decrease. Conversely, if it exceeds 40 mol%, it may be difficult to obtain a copolyester ether resin having a desired degree of polymerization.

The dicarboxylic acid component constituting the polyester segment desirably contains at least 60 mol% of an aromatic dicarboxylic acid and / or an ester-forming derivative thereof. If the amount of the aromatic dicarboxylic acid component is less than 60 mol%, the adhesion of the coating layer to the polyester film layer may be reduced.

As the diol component of the copolyester ether resin, for example, an aliphatic diol such as ethylene glycol, 1,3-propanediol 1,4-butanediol, or a cycloaliphatic diol such as 1,4-cyclohexanedimethanol is used. . Further, the following formula (where n is an integer of 2 to 140) is added to the aliphatic diol or the cycloaliphatic diol.
What copolymerized the polyethylene glycol shown by these may be used.

HO—CH ₂ —CH _{2 n} OH In addition, not only one kind but also two or more kinds of polyethylene glycol copolymerized with the diol component may be used. In this case, the polyethylene glycol is used in an amount of 1 to 60% by weight based on the total amount of the diol component,
Desirably, it is copolymerized by weight. If the polyethylene glycol content is less than 1% by weight, the water solubility and coatability of the copolyester ether resin may decrease. Conversely, if it exceeds 60% by weight, the coating layer may cause blocking.

The inorganic inert fine particles used in the composition constituting the coating layer are obtained from an inorganic colloid. The term “inorganic colloid” as used herein means one colloid particle containing 10 ⁵ to 10 ⁹ atoms. As the inorganic colloid, a metal colloid, an oxide colloid, a hydroxide colloid, a carbonate colloid, a sulfate colloid, or the like is used depending on the type of element. Examples of the element used in the metal colloid include palladium, platinum, silver, sulfur and the like. In addition, oxide colloids, hydroxide colloids, carbonate colloids, and sulfate colloids include zinc, magnesium, silicon, calcium, aluminum, strontium, barium, zirconium, titanium, manganese, iron, cobalt, nickel, and tin. Is used. Particularly preferred as the inorganic inert fine particles are silicate colloids. This silicate colloid can be obtained by adding silicon tetrahalide to water or by gradually adding concentrated hydrochloric acid to an aqueous solution of an alkali silicate.

The average particle size of the inorganic colloid is 0.05 to 0.80 μm, and more preferably 0.1 to 0.80 μm.
The range is preferably from 10 to 0.50 μm, more preferably from 0.15 to 0.25 μm. When the average particle size is small, the resin film of the present invention may have insufficient surface slippery properties, and may have increased cohesiveness of the particles, so that the transparency of the resin film may be reduced. Conversely, when the average particle size is large, the surface roughness of the resin film becomes large, and the wear resistance decreases. Further, the stability of the inorganic colloid particles in an aqueous solution is deteriorated, and in some cases, precipitation, aggregation, gelation, etc. of the particles occur. Furthermore,
When flakes of a resin film are collected and reused, the surface roughness of the film is promoted, and the surface slipperiness is deteriorated. Here, the average particle diameter is a value obtained by measuring an aqueous inorganic colloid solution using a centrifugal sedimentation type particle size distribution analyzer (for example, SA-CP2 type manufactured by Shimadzu Corporation).

The mixing ratio of the water-dispersible or water-soluble resin used for the coating layer and the inorganic inert fine particles is usually 100 parts by weight of the water-dispersible or water-soluble resin. 0.1 to 30 parts by weight. When the mixing ratio of the inorganic inert fine particles is small, it is difficult to obtain a resin film having the desired sliding property and adhesiveness. Conversely, if the mixing ratio is large, the transparency and abrasion resistance of the resin film deteriorate, and the adhesion between the coating layer and the polyester film decreases.

In addition, in addition to the water-dispersible or water-soluble resin and the inorganic inert fine particles, the composition for forming the coating layer includes a surfactant, an antifoaming agent, a coating improver, a thickener, an antistatic agent, and an ultraviolet ray. A third component such as an absorbent, a dye, and a pigment may be mixed. In this case, the third component is mixed so that the total of the water-dispersible or water-soluble resin and the inorganic inert fine particles is 70% by weight or more of the composition. If the mixing amount of the third component is too large, the mechanical strength of the coating layer decreases,
Adhesion between the coating layer and the polyester film layer is reduced.

The thickness of the coating layer used in the present invention is 0.005 to 1.000 μm.
m, more preferably 0.010 to 0.500 μm. If the thickness is too small, it is difficult to uniformly laminate the polyester film layer. In addition, the adhesiveness and surface slipperiness of the coating layer decrease. Conversely, if the thickness is too large, the transparency and the surface slipperiness are reduced, and the coating layers are likely to cause blocking.

Haze value The haze value of the resin film of the present invention is 0.5% or more and 1.3% or less. A desirable upper limit is 1.0%. 1.3 haze
%, The gloss of the base paper decreases. Further, when the base paper has a window opening portion, the transparency of the portion is lost, and the appearance of the product is impaired.

The haze value is a value measured using a photoelectric photometer (for example, manufactured by Nippon Seimitsu Kogyo Co., Ltd.) according to JIS-K6714.

Static friction coefficient The static friction coefficient of the coating layer used in the resin film of the present invention is 0.6 or more and 1.0 or less. A desirable upper limit is 0.7. When the static friction coefficient exceeds 1.0, the surface of the coating layer is easily damaged.

The coefficient of static friction is a value measured according to ASTM-D1894. Specifically, a sample film of 80 x 150 mm is overlapped, a load of 200 g is placed on top of it, and the tension obtained when the lower sample film is pulled at a speed of 200 mm / min is divided by the load of 200 g. It is. The initial value at the start of pulling was defined as the coefficient of static friction.

Wetting tension The wetting tension of the coating layer used in the resin film of the present invention is from 47 dyne / cm to 53 dyne / cm. Desirable lower limit is
It is 50 dyne / cm. If the wetting tension is less than 47 dyne / cm,
Adhesiveness between the resin film and the base paper is deteriorated during the sack bonding process.

The wetting tension is a value measured according to JIS-K6768. Specifically, a mixed solution of formaldehyde and ethyl cellosolve was applied to the coating layer, and a determination was made on the wet state.

Surface Specific Resistance The surface specific resistance of the coating layer used for the resin film of the present invention is 1.2 × 10 ¹¹ Ω / cm 2 or more and 10 ¹³ Ω / cm 2 or less. A desirable upper limit is 10 ¹² Ω / cm 2. Surface resistivity is 10 ¹³ Ω
If it exceeds / □, dust and dirt tend to adhere to the sack when it is applied, and the commercial value decreases. In addition, the workability of attaching the sack is deteriorated.

The surface resistivity is a value of the surface resistivity measured using a super insulation meter (for example, MMA II-17 manufactured by Kawaguchi Electric Co., Ltd.). The measured values are values measured in an atmosphere at a temperature of 25 ° C. and a humidity of 65%.

Method for Producing Resin Film The coating layer laminated on the polyester film layer is formed by applying a composition constituting the coating layer on the polyester film. At this time, the polyester film may be in an unstretched state or may be stretched in a uniaxial or biaxial direction in advance.

As a method for applying the composition, for example, a known method such as an extrusion lamination method, a melt coating method, a gravure coating method, a reverse coating method, a kiss coating method, a die coating method, and a metaling bar coating method can be applied. The composition applied using such a method is dried to form a coating layer. The polyester film may be previously subjected to corona discharge treatment or other surface treatment in air, nitrogen, or another atmosphere. In this case, the adhesion between the polyester film and the coating layer is improved.

The amount of the composition applied and the drying conditions are in a range that does not adversely affect the polyester film.

********** The second invention is a laminated body for a sack-attached container comprising a base paper and the resin film for a sack-attached container according to the first invention laminated on the base paper.

Laminate FIG. 2 shows an example of the laminate for a sack-sticking container of the present invention. The laminate 5 has a configuration in which the resin film 1 according to the first invention is laminated on the base paper 4. Resin film 1
Are laminated so that the polyester film layer 2 is bonded to the base paper 4.

Base Paper Examples of the base paper used in the present invention include white paperboard, yellow paperboard, colored paperboard, and chip balls.
Among these, in the present invention, white paperboard excellent in appearance, printability and box making suitability, especially weighing 210 to 600 g / m ²
It is desirable to use white paperboard. As the white paperboard, either a small box manila ball or a large box white ball may be used.

Resin film The resin film used in the present invention is the resin film according to the first invention. As the resin film, a coating layer mainly composed of water-soluble or water-dispersible acrylic resin and inorganic inert fine particles, or a coating layer mainly composed of water-soluble copolyester ether resin and inorganic inert fine particles May be used.

Production of Laminate The laminate of the present invention can be produced by laminating the base paper 4 and the polyester film layer 2 of the resin film 1 using an adhesive. As the adhesive, for example, a polyester-based or acrylic-based adhesive is used. The adhesive may be applied to either the base paper 4 or the resin film 1. Further, an adhesive may be applied to both the base paper 4 and the resin film 1. When the base paper 4 has a window opening, it is desirable to apply an adhesive to the base paper 4.

Utilization of Laminated Body FIGS. 3A to 3F show a process of manufacturing a box by sack bonding using the laminated body of the present invention.

First, as shown in FIG. 3A, the laminate 5 of the present invention is formed into a shape in which a hexahedral box is developed. The molded laminate 5 is provided with surfaces A and B serving as the top or bottom surface of the box and surfaces C and D serving as the side walls alternately and continuously. Also the surface
Surfaces E and F, which are symmetrical lids, are continuously provided on A and B, respectively. Further, the surface A is provided with a margin a on the edge opposite to the surface C. A predetermined fold line shown by a dashed line in FIG. 3A is provided at a boundary between the respective surfaces. The laminate 5 has the resin film 1 on the back surface of the surface shown in FIG. 3A.

To manufacture a box from such a laminate 5, first,
As shown in FIGS. 3B and 3C, the margin a and the surfaces C and B
Is temporarily folded along the folding lines b and c, and is restored again to give a folding habit. Next, the back side of the margin a,
That is, an adhesive is applied to the surface on which the resin film 1 is laminated. As the adhesive, an adhesive for attaching a sack such as an acrylic resin or a vinyl acetate resin is used. In this way, as shown in FIG. 3D, an adhesive is applied to the back surface of the margin “a”, and the laminated body 5 having the folding lines b and c with a folding habit is obtained. This laminate 5 is, as shown in FIG. 3E,
By folding the fold lines d and e at the boundary between the surfaces A and C and between the surfaces B and D, and bonding the back surface of the margin a to the surface of the corresponding surface D, three-dimensionally in accordance with the above-mentioned folding habit. By shaping it into a box. As shown in FIG. 3F, this box is a box in which openable and closable lids are provided at openings at both ends, and a resin film 1 is arranged on an outer surface.

Since the laminate of the present invention includes the resin film according to the first invention, the laminate has excellent antistatic properties and surface slip properties. Therefore, the workability at the time of sticking the sack is good. Moreover, dust is not easily attached to the sack sticking container using the laminate of the present invention. Further, in the case of a container having a window opening, since the resin film covering the window opening has good transparency,
The appearance of the product inside is not impaired.

〔The invention's effect〕

In the first invention, it is possible to obtain a resin film for a sack-sticking container which simultaneously satisfies transparency, glossiness, adhesiveness, antistatic properties and surface slippage.

In the second invention, since the resin film according to the first invention is used, it is possible to obtain a laminate for a sack-sticking container having good workability during sack-sticking.

〔Example〕

Example 1 Polyethylene terephthalate pellets containing sodium dodecylbenzenesulfonate as an antistatic agent and silicon oxide as a lubricant were produced, and vacuum-dried. The obtained pellets were supplied to an extruder at 280 ° C. and melt-extruded from a T-shaped die. The pellets were received by a casting drum having a surface temperature of 20 ° C. and cooled and solidified to produce a 143 μm-thick polyester film. The obtained polyester film was stretched 0.3 times in the longitudinal direction by roll stretching at 90 ° C. to obtain a uniaxially stretched film.

On the other hand, a water-dispersible acrylic resin in which a carboxyl group and a methylol group are each introduced at 2% by weight into a copolymer resin composed of 40% by mole of methyl methacrylate and 60% by mole of methyl acrylate, and a silica sol having an average particle size of 0.12 μm. The following compositions were prepared. The mixing ratio between the water-dispersible acrylic resin and the silica sol was 97: 3 by weight solids ratio. Then, a coating having a concentration of 2.0% by weight was prepared by uniformly dispersing the composition in filtered water.

The obtained coating agent was applied to the uniaxially stretched film on one surface by a metaling bar method at 11 g / m ^2, and the applied layer was dried. Thereafter, the uniaxially stretched film was stretched in the transverse direction by a factor of 3.6 at 100 ° C., and further heat-treated at 220 ° C. for 5 seconds while relaxing 2% in the transverse direction. Thus, a resin film having a thickness of 12 μm on which a coating layer having a thickness of 0.06 μm was laminated was obtained.

The haze value of the obtained resin film was measured. Further, the static friction coefficient, the wetting tension and the surface resistivity of the coating layer were measured. The results are as shown in Table 1.

Next, an adhesive was applied to the polyester film side of the obtained resin film and bonded to 350 g / m ² white paperboard to produce a laminate. The adhesive is Seika Bond A1
A mixture of 60 and C46H (produced by Dainichi Seika Kogyo Co., Ltd.) at a ratio of 1: 1 was used. The coating amount is 2 g as solids.
/ was m ^2.

Next, to create a box from the laminate, the laminate is 3A
The box as shown in the figure was formed into a developed shape. Then, the laminate was put on a sack sticking machine to form a box. In addition,
Life Bond AV is used as an adhesive to be applied to the margin
-650 (manufactured by Niei Chemical Co., Ltd.) was used. As a result of peeling off the adhesive portion to examine the adhesiveness of the margin portion, the adhesiveness was so good that the surface of the white paperboard bonded to the margin portion was broken.

Example 2 As a composition for forming a coating layer, a composition comprising a copolyester ether resin and silica sol was prepared. As the copolyester ether, a copolyester ether composed of terephthalic acid containing 14 mol% of 5-sodium sulfoisophthalic acid and ethylene glycol containing 13 mol% of diethylene glycol was used. On the other hand, a silica sol having an average particle size of 0.12 μm was used. The mixing ratio between the copolyester ether and the silica sol was such that the weight ratio of the copolyester ether was 95% by weight and the silica sol was 5% by weight.

A coating composition having a concentration of 2.0% by weight was prepared by uniformly dispersing the obtained composition in water. This coating material was applied to one surface of the same uniaxially stretched film used in Example 1 by a metaling bar method, and a resin film was prepared in the same manner as in Example 1. The haze value and the like of the obtained resin film were measured. The results are as shown in Table 1.

The obtained resin film was laminated on white paperboard in the same manner as in Example 1 to obtain a laminate. Example 1 was obtained from the obtained laminate.
In the same manner as described above, a box was made by sack-pasting. When the adhesive at the margin was examined in the same manner as in Example 1, the adhesive was good as in Example 1.

Example 3 A composition was prepared in which the mixing ratio of the water-dispersible acrylic resin and the silica sol constituting the composition for the coating layer used in Example 1 was 99: 1 by weight-solids ratio. In this example, a silica sol having an average particle size of 0.10 μm was used. Then, a coating composition in which the obtained composition was uniformly dispersed in filtered water so as to have a concentration of 1.0% by weight was prepared. Using this coating material, from the same uniaxially stretched film as in Example 1,
A resin film was manufactured in the same manner as in Example 1. About the obtained resin film, the haze value etc. were measured like Example 1. The results are as shown in Table 1.

In addition, a laminate was prepared from the obtained resin film in the same manner as in Example 1, and a box was formed using the obtained laminate by sack sticking. When the adhesiveness of the margin was examined in the same manner as in Example 1, good results were obtained as in Example 1.

Comparative Example 1 A uniaxially stretched film was obtained from polyethylene terephthalate pellets to which silicon oxide was added as a lubricant in the same manner as in Example 1. This uniaxially stretched film is stretched 3.6 times in the transverse direction at 100 ° C., and relaxed by 2% in the transverse direction.
Heat treatment was performed for 2 seconds to obtain a resin film having a thickness of 12 μm. About the obtained resin film, the haze value etc. were measured like Example 1. The results are as shown in Table 1.

Using the obtained resin film, a laminate was prepared in the same manner as in Example 1. An attempt was made to form a box by sack-sticking using this laminate, but the box could not be manufactured due to insufficient adhesion between the margin portion and the white paperboard.

Comparative Example 2 One side of the resin film produced in Comparative Example 1 was subjected to a corona discharge treatment. The haze value and the like of this resin film were measured in the same manner as in Example 1. The results are as shown in Table 1.

The obtained resin film was adhered to white paperboard so that the corona discharge treated surface was on the outside, to produce a laminate. Using this laminate, a box was manufactured by the sack-sticking process in the same manner as in Example 1, and the adhesiveness of the margin was good.

Comparative Example 3 The uniaxially stretched film produced in Example 1 was stretched 3.6 times in the transverse direction at 100 ° C. and further relaxed 2% in the transverse direction.
C. for 5 seconds to produce a resin film having a thickness of 12 .mu.m. The haze value and the like of this resin film were measured in the same manner as in Example 1. The results are as shown in Table 1.

A laminate was prepared using the obtained resin film in the same manner as in Example 1, and a box was manufactured by sack sticking in the same manner as in Example 1. At first glance, the adhesiveness of the glue margin was good,
The adhesion was not strong enough to break the white paperboard. Also,
Due to the poor slipperiness of the resin film, the resin film was easily wrinkled and scratched on the surface of the resin film during the sticking operation.

Comparative Example 4 A 20-μm-thick biaxially stretched polypropylene film (trade name: Trefane S645, manufactured by Toray Industries, Inc.) was measured for haze value and the like in the same manner as in Example 1.

The results are as shown in Table 1.

An adhesive obtained by mixing Seika Bond E270 and C30 (manufactured by Dainichi Seika Kogyo Co., Ltd.) at a ratio of 1: 1 is applied to one surface of the biaxially stretched polypropylene film, and bonded to the same white paperboard as in Example 1. To produce a laminate. The adhesive was applied at a solid content of 2 g / m ² .

A box was manufactured from the obtained laminate by sack sticking in the same manner as in Example 1. The adhesive at the margin was apparently good, but not so great as to break the surface of the white paperboard.

Comparative Example 5 A 15-μm-thick biaxially stretched polyvinyl chloride film (trade name: Hishilex, manufactured by Mitsubishi Plastics, Inc.) was measured for haze value and the like in the same manner as in Example 1. The results are as shown in Table 1.

On one surface of the biaxially stretched polyvinyl chloride film, Seikabond U509 and UD-C (manufactured by Dainichi Seika Kogyo Co., Ltd.)
An adhesive mixed at a ratio of 0: 6 was applied and bonded to white paperboard in the same manner as in Example 1 to form a laminate. The adhesive was applied at a solid content of 2 g / m ² .

A box was manufactured from the obtained laminate by sack sticking in the same manner as in Example 1. At first glance, the adhesive properties of the margins were good, but not enough to break the surface of the white paperboard.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a resin film for a sack container according to an example of the first invention. FIG. 2 is a partial longitudinal sectional view of a laminated body for a sack container according to an example of the second invention. FIG. 3 to FIG. 3F are diagrams showing a manufacturing process when a box is manufactured by sticking using the laminate according to the second invention. 1 ... resin film, 2 ... polyester film layer,
3 ... coating layer, 4 ... base paper, 5 ... laminate.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeki Seki 1-1-1, Sonoyama, Otsu City, Shiga Prefecture Toray Industries, Inc. Shiga Works (56) References JP-A-62-279943 (JP, A) 62-193950 (JP, A) JP-A-1-27941 (JP, A) JP-A-58-22134 (JP, A)

Claims (4)

(57) [Claims] 1. A resin film used as an outer surface of a sack container, comprising: a polyester film layer; and a coating layer laminated on the polyester film layer, wherein the coating layer is a coating layer on a polyester film. The haze value of the layer in a laminated state is 0.5% or more and 1.3% or less, and the coating layer has a static friction coefficient of 0.6 or more and 1.0 or less and a wetting tension.
47dyne / cm or more and 53dyne / cm or less, surface resistivity 1.2 × 10
^A resin film for a sack-sticking container, having a resistance of ¹¹ Ω / cm2 or more and 10 ¹³ Ω / cm2 or less. 2. The resin film for a sack-sticking container according to claim 1, wherein the coating layer mainly comprises a water-soluble or water-dispersible acrylic resin and inorganic inert fine particles. 3. The resin film for a sack container according to claim 1, wherein the coating layer mainly comprises a water-soluble copolyester ether resin and inorganic inert fine particles. 4. A laminate for a sack-sticking container comprising: a base paper; and the resin film according to any one of (1) to (3) laminated on the base.