JPH03638A - Plastic resin film for sack-sticked vessel and laminate - Google Patents

Abstract

PURPOSE:To give transparent, lustrous, adhesive, static proof and surface-sliding characteristics at the same time, by providing a polyester film layer and a coating layer laminated thereon and specifying a haze in the laminated condition, an electro-static friction coefficient of the coating layer, a wet tension, and a proper surface resistance. CONSTITUTION:A vessel is provided with a polyester film layer 2 and a coating layer 3 laminated thereon, which is chiefly made of water soluble or water dispersing acryl resin, inorganic inert fine particles or water soluble copolyester- ether resin and inorganic inert fine particles. Haze value of this resin film 1 is less than 1.3%. A higher haze than this value lowers luster of a base board. And the electro-static coefficient of the coating layer 3 is less than 1.0 and a higher value than this figure makes it spoil easily on the surface thereof. And further the wet tension of the coating layer is higher than 47dyne/cm and a lower value than this figure makes the adhesion worse for an adhesive condition between the resin film and the base board on the sticking work of the sack. Moreover, the proper surface resistance of the coating layer is less than 10<13>OMEGA/unit square and a larger resistance than this figure makes it stick dust and foreign materials easily processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a resin film and a laminate, particularly a film used for a laminate for a container with a sack attached thereto, and a laminate including the film.

(Prior Art) Sack pasting is a method of manufacturing containers such as paper boxes and envelopes. Sack pasting is the process of applying adhesive to the glue margin of a base paper that has the shape of an expanded container such as a box.
This is a method of manufacturing a container by folding this base paper in order (possibly crimping the glue margin to a predetermined location).

A thermoplastic resin film is laminated on the base paper used for such sack pasting for the purpose of improving water resistance and oil resistance and imparting gloss. Also,
When manufacturing a container having a window opening part, a base paper on which a thermoplastic resin film is laminated to cover the window opening part is also used.

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

(What the invention attempts to solve! ia) The thermoplastic resin film laminated to the base paper used for sack pasting is required to have transparency and gloss, as well as the workability of sack pasting and the ease of gluing. A material that does not impair adhesiveness is required.

However, although the conventionally used polyvinyl chloride resin film has excellent transparency and gloss, it has noticeable fish eyes and is therefore unsuitable for use as a base paper for containers having window openings.

In addition, there is a lot of slack and dimensional stability is not sufficient.

Furthermore, it has poor cold resistance and is prone to cracking in cold weather.

Furthermore, polypropylene resin films do not have sufficient transparency or gloss. Furthermore, the dimensional stability is not sufficient, and depending on the type of adhesive for pasting the bag, the glue margin may not exhibit sufficient adhesiveness.

Furthermore, both polyvinyl chloride resin films and polypropylene resin films have insufficient antistatic properties and surface slip properties. Therefore, the base paper on which these resin films are laminated has a problem that the workability of pasting the bag is poor and that dust tends to adhere to the base paper.

A first object of the invention is to provide a resin film for containers with sacks that can simultaneously satisfy transparency, gloss, adhesiveness, antistatic properties, and surface slipperiness.

A second object of the invention is to provide a laminate for containers with sacks provided with the resin film for containers with sacks according to the first invention.

[Means for Solving the Problems] A resin film for sack-covered containers according to the first invention includes a polyester film layer and a coating layer laminated on the polyester film layer.

The haze value of the layer in the laminated state is 1. It is 3% or less. In addition, the coating layer has a static friction coefficient of 1° or less, a wetting tension of 47 dyne/cm or more, and a surface resistivity of 10.
``Less than 97 units.

The coating layer is mainly composed of, for example, a water-soluble or water-dispersible acrylic resin and inorganic inert fine particles.

Further, the coating layer is mainly composed of, for example, a water-soluble copolyester ether resin and inorganic inert fine particles.

FIG. 1 shows an example of the resin film for containers with sacks according to the present invention. The resin film 1 has a polyester film layer 2
It has a structure in which a covering layer 3 is laminated on the top.

The polyester resin used in the polyester film layer of the BOI SOL film is a resin containing an ester group obtained by polycondensation of a dicarboxylic acid and a diol. As a dicarboxylic acid,
Examples include aromatic and aliphatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalene dicarboxylic acid, adipic acid, and sebacic acid.

Furthermore, examples of diols include ethylene glycol, butanediol, hexanediol, neopentyl glycol, and the like. Two or more of the dicarboxylic acids and diols may be used in combination. Furthermore, polyester resins may be copolymerized with polyethylene glycols such as diethylene glycol and triethylene glycol, polyalkylene oxides such as polyethylene oxide, and other monomers and polymers. , ultraviolet absorbers, lubricants, pigments, antioxidants, plasticizers, antistatic agents, etc. may be mixed.

A polyester film is produced by molding the polyester resin into a film shape using a well-known method such as roll casting.

The polyester film layer used in the present invention is an unstretched film, a -axially stretched film, or a biaxially stretched polyester film produced by the method described above. In particular, it is desirable to use a biaxially stretched polyester film. As a biaxially stretched polyester film, it is 2.0 to 5.0 times in the vertical direction and 2.0 to 5.0 times in the horizontal direction.
Preferably, it is double-stretched. Also, the thickness is 4 to 100
μm, preferably 6 to 50 μm.

Coating 1 The coating layer used in the present invention is composed of a composition whose main components are a water-dispersible or water-soluble resin and inorganic inert fine particles.

Examples of water-dispersible or water-soluble resins include epoxy resins, polyamide resins, cellulose resins, polyvinyl alcohols, acrylic resins, and copolyester ether resins.

These water-dispersible or water-soluble resins may be used alone or in combination of two or more. Note that particularly desirable water-dispersible or water-soluble resins are acrylic resins and copolyester ether resins.

Examples of the acrylic resin include copolymer resins of acrylic monomers and ethylenically unsaturated monomers.

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

(B) CHg-8-COORz Here, R represents hydrogen or a methyl group. Also, R+,
Rz is an alkyl group having 1 to 4 carbon atoms, and R1≦R2
It satisfies the following. The acrylic monomers represented by the structural formulas (A) and (B) may be used in combination of two or more.

In addition, as the acrylic monomer, based on 30 to 95 mol% of the acrylic monomer represented by the structural formula (A),
The acrylic monomer represented by the structural formula (B) is 70 to
A mixture of 5 mol% is desirable.

On the other hand, ethylenically unsaturated monocarbytes have the following functional groups, groups directly condensed with these functional groups, or groups condensed with these functional groups via an aliphatic hydrocarbon, which form unsaturated carbon-carbon double bonds. It is directly connected to.

-COOH, CONRa Rs, NRa Rs
.

Here, R4 and Rs 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 80.0 to 99.9 mol% of the acrylic monomer to the ethylenically unsaturated monomer. It is desirable that the monomer content be 20.0 to 0.1 mol%.

When a copolyester ether resin is used as a water-dispersible or water-soluble resin, the acid component may be either an aromatic dicarboxylic acid or a non-aromatic dicarboxylic acid. Examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, phthalic acid, 2,5-dimethylterephthalic acid, 1,4-naphthalenedicarboxylic acid, 2
．． 6-naphthalene dicarboxylic acid, biphenyl dicarboxylic acid L 1,2-bis(phenoxy)ethane-p.

Po-dicarboxylic acids and their ester-forming derivatives are used. Examples of non-aromatic dicarboxylic acids include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, 1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and ester-forming acids thereof. Derivatives etc. are used.

Examples of the ester-forming derivative used in the dicarboxylic acid component include sulfonic acid alkali metal salt compounds. Examples of the sulfonic acid alkali metal salt compounds include sulfoterephthalic acid, 5-sulfoisophthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-27-dicarboxylic acid, sulfo-p-xylene glycol, 2-sulfo-1,4- Examples include alkali metal salts of sulfonic acids such as bis(hydroxyethoxy)benzene and ester-forming derivatives thereof. In particular, it is desirable to use trichum salt of 5-sulfoisophthalic acid, sodium salt of sulfoterephthalic acid, and ester-forming derivatives thereof. These ester-forming sulfonic acid alkali metal salt compounds are preferably contained in an amount of 1 to 40 mol%, more preferably 10 to 20 mol%, based on the total dicarboxylic acid components. If the content is less than 1 mol%, the water solubility and coating properties of the copolyester ether resin may decrease. On the other hand, if it exceeds 40 mol%,
It may be difficult to obtain copolyester ether resins with the desired degree of polymerization.

The dicarboxylic acid component constituting the polyester segment contains a small amount of aromatic dicarboxylic acid and/or its ester-forming derivative (preferably both contain 60 mol%. If the aromatic dicarboxylic acid component is less than 60 mol%) In some cases, the adhesion of the coating layer to the polyester film layer may be reduced.

The diol component of copolyester ether resin is
For example, aliphatic diols such as ethylene glycol, 1.3-7'ropanediol and 1.4-7'tanediol, and cycloaliphatic diols such as 1,4-cyclohexane dimetatool are used.

Furthermore, a copolymer of the aliphatic diol or the cycloaliphatic diol with polyethylene glycol represented by the following formula (wherein n is an integer of 2 to 140) may be used.

H-40-CH2-CH2-)-r-OHThe polyethylene glycol copolymerized with the diol component is
Not only one type but two or more types may be used. In this case, the amount of the polyethylene glycol is 1 to 60% of the total amount of the diol component. %, preferably 2 to 18% by weight. If the polyethylene glycol content is less than 1% by weight, the water solubility and coating properties of the copolyester ether resin may decrease.

Conversely, if it exceeds 60% by weight, blocking may occur in the coating layer.

The inorganic inert fine particles used in the composition constituting the coating layer are obtained from inorganic colloids. The inorganic colloid mentioned here is one that contains 10s to 10' atoms in one colloid particle. As the inorganic colloid, metal colloid, oxide colloid, hydroxide colloid, carbonate colloid, sulfate colloid, etc. are used depending on the type of element. Elements used in metal colloids include:
Examples include palladium, platinum, silver, and sulfur. 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, soot, etc. are used. Note that silicic acid colloid is particularly desirable as the inorganic inert fine particles. This silicic acid colloid can be obtained by adding silicon tetrahalide to water or by gradually adding concentrated hydrochloric acid to an aqueous solution of alkali silicate.

The average particle size of the inorganic colloid is 0.05 to 0.80 II m
'- further 0.10 to 0.50 μm, further 0°15
If the average particle size is small, which is preferably in the range of ~0.25 μm, the surface slipperiness of the resin film of the present invention will be insufficient. Furthermore, since the cohesiveness of the particles increases, the transparency of the resin film may decrease. On the other hand, when the average particle size is large, the surface roughness of the resin film becomes large and the abrasion resistance decreases. Also, water in inorganic colloid particles? 8 The stability in the liquid deteriorates, and in some cases, precipitation, aggregation, gelation, etc. of particles occur. Furthermore, when the flakes of the resin film are collected and reused, the surface roughness of the film is promoted and the surface slipperiness is deteriorated.

Note that the average particle size here refers to the inorganic colloid aqueous solution measured using a centrifugal sedimentation type particle size distribution analyzer (for example,
A-CP2 type).

The mixing ratio of the water-dispersible or water-soluble resin and the inorganic inert fine particles used in the coating layer is usually 0.00 parts by weight of the inorganic inert fine particles per 100 parts by weight of the water-dispersible or water-soluble resin. It is 1 to 30 parts by weight. When the mixing ratio of inorganic inert fine particles is small, the desired slipperiness,
A resin film with adhesive properties is advantageous.On the other hand, if the mixing ratio is large, the transparency and abrasion resistance of the resin film may deteriorate, and the adhesion between the coating layer and the polyester film may decrease. .

In addition to water-dispersible or water-soluble resin and inorganic inert fine particles, the composition forming the coating layer also includes surfactants,
A third component such as an antifoaming agent, a coating property improver, a thickener, an antistatic agent, an ultraviolet absorber, a dye, a pigment, etc. 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 amount of the third component mixed is too large, the contract strength of the coating layer may decrease, or the adhesion between the coating layer and the polyester film layer may decrease.

The thickness of the coating layer used in the present invention is 0.005 to 1.
If the thickness is too small, it will be difficult to uniformly laminate the polyester film layer. Furthermore, the adhesion and surface slipperiness of the coating layer are reduced. On the other hand, if the thickness is too large, the transparency and surface slipperiness will decrease, and the coating layers will likely block each other.

The haze value of the resin film of the present invention is 1.3% or less, preferably 1.0% or less. If the haze value exceeds 1.3%, the glossiness of the base paper will decrease.

Further, when the base paper has a window opening portion, the transparency of that portion is lost and the appearance of the product is impaired.

Note that the haze value is a value measured using a photoelectric photometer (for example, manufactured by Nippon Seimitsu Kogaku) in accordance with JIS-6714.

The static friction coefficient of the coating layer used in the resin film of the present invention is 1.0 or less, preferably 0.7 or less. If the static friction coefficient exceeds 1.0, the surface of the coating layer is likely to be scratched.

Note that the static friction coefficient is a value measured according to ASTM-D 1894. Specifically, sample films of 80 x 150 mm were stacked on top of each other, a load of 200 g was placed on top of them, and the tension when the lower sample film was pulled at a speed of 200 mm/min was divided by the load of 200 g. It is a value. This initial value at the beginning of pulling was taken as the static friction coefficient.

The wetting tension of the coating layer used in the resin film of the present invention is 47 dyn/cm or more, preferably 50 dyn/cm.
e/cm or more. Wetting tension is 47dyn
If it is less than e/cm, the adhesiveness between the resin film and the base paper will deteriorate during the sack pasting process.

In addition, the wetting tension is a value measured according to JIS-676B. Specifically, a mixed solution of formaldehyde and ethyl cellosolve was applied to the coating layer, and the wet state was evaluated.

Table 1 marked U (wide) The surface resistivity of the coating layer used in the resin film of the present invention is 10 + 3 Ω/or less, preferably 10 (07 or less). If the surface resistivity exceeds 10 + 3 Ω/or Dust and dirt tend to adhere during processing, reducing the product value.Also, the workability of pasting the sack deteriorates.

Note that the surface resistivity is the absolute total (for example,
This is the value of the surface electrical resistance measured using MMI-17 model (manufactured by Mimaki Co., Ltd.). Note that the measured values are values measured in an atmosphere with a temperature of 25° C. and a humidity of 65%.

The coating layer to be laminated to the 1" polyester film layer of the film is formed by applying the composition constituting the coating layer onto the polyester film. At this time, the polyester film may be in an unstretched state or may be uniaxially stretched in advance. It may be stretched in one direction or in two directions.

Examples of methods for applying the composition include extrusion lamination, melt coating, gravure coating,
Reverse coat method, kitsu coat method, durze coat method,
The well-known method of Metalling Verco-1 and settlement of accounts can be applied. The composition applied using such a method is dried to form the J'1 layer. Note that the polyester film may be previously subjected to corona discharge treatment or other surface treatment in air, nitrogen, or other atmosphere.

In this case, the adhesiveness between the polyester film and the coating layer is improved.

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

＊＊＊＊＊＊＊ The second invention is a laminate for sack-bound containers, which includes a base paper and the resin film for sack-bound containers according to the first invention, which is laminated on the base paper.

(1) An example of the laminate for containers with sacks according to the present invention is shown in FIG. The laminate 5 has a structure in which the resin film 1 according to the first invention is laminated on the base paper 4. The resin film 1 is laminated so that the polyester film layer 2 is bonded to the base paper 4.

The base paper used in the present invention includes white paperboard, yellow paperboard,
Examples include colored paperboard and chipboard. Among these, the present invention uses white paperboard that has excellent appearance, printability, box-making suitability, etc., especially paperboard with a basis weight of 210 to 600.
It is preferable to use g/rrf white paperboard. Further, as the white paperboard, either manila balls for small boxes or white balls for large boxes may be used.

The resin film used in the present invention is the resin film according to the first invention. The resin film may be a coating layer mainly composed of a water-soluble or water-dispersible acrylic resin and inorganic inert fine particles, or a coating layer mainly composed of a water-soluble copolyester ether resin and inorganic inert fine particles. A device with the following may also be used.

■Plate production The laminate of the present invention can be produced by bonding the base paper 4 and the polyester film layer 2 of the resin film 1 together using an adhesive. As the adhesive, for example, a polyester adhesive or an acrylic adhesive is used. The adhesive may be applied to either the base paper 4 or the resin film 1, or the adhesive may be applied to both the base paper 4 and the resin film 1. In addition, when the base paper 4 has a window part, it is desirable to apply an adhesive to the base paper 4.

(1) Dish body (2) Figures 3A to 3F show the process of manufacturing a box using the laminate of the present invention by sack pasting.

First, the laminate 5 of the present invention is formed into the shape of an expanded hexahedral box, as shown in FIG. 3A.

The molded laminate 5 is provided with alternately continuous surfaces A and B, which are the top or bottom surfaces of the box, and surfaces C, D, which are the side walls. Moreover, surfaces E and F, which serve as lids, are provided symmetrically and consecutively to surfaces A and B, respectively. moreover,
On side A, a glue margin a is provided on the opposite edge of side C. Note that a predetermined folding line shown by a dashed line in FIG. 3A is provided at the boundary of each surface. The laminate 5 is the third
It has a resin film 1 on the back side of the side shown in Figure A.

In order to manufacture a box from such a laminate 5, first, the third
As shown in Figures B and 3C, the paper is temporarily folded along the glue margin a and the boundary between surfaces C and B along c, and then folded back again to form a crease. Next, glue a
Adhesive is applied to the back surface, that is, the surface on which the resin film 1 is laminated.

As the adhesive, a sack adhesive such as acrylic resin or vinyl acetate resin is used. In this way,
As shown in FIG. 3D, a laminate 5 is coated with adhesive on the back side of the glue margin a and has a crease at the fold line c.
is obtained. This laminate 5, as shown in FIG. 3E,
A box shape is obtained by bending the fold lines d and e at the boundaries between surfaces A and C, and between surface B and the surface, and gluing the back side of the glue margin a to the surface of the corresponding surface. As shown in FIG. 3F, this box is a box with openable and closable lids provided at openings at both ends.

Since the laminate of the present invention includes the resin film according to the first invention, it has excellent antistatic properties and surface slip properties. Therefore, the workability during the above-mentioned sack pasting is good. In addition, dust does not easily adhere to the bag-pasted container using the laminate of the present invention. Furthermore, in the case of a container with a window opening, the resin film covering the window opening has good transparency, so the appearance of the product inside is not impaired.

〔Effect of the invention〕

In the first invention, it is possible to obtain a resin film for containers with sacks that simultaneously satisfies transparency, gloss, adhesiveness, antistatic property, and surface slipperiness.

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-attached container with good workability during sack-attaching processing.

〔Example〕

Polyethylene terephthalate pellets containing sodium dodecylbenzenesulfonate as an antistatic agent and silicon oxide as a lubricant were produced and dried in vacuum. The obtained pellets were fed to an extruder at 280°C and
It is melt-extruded from a shaped die, received by a casting drum with a surface temperature of 20°C, cooled and solidified, and has a thickness of 14 mm.
A 3 μm polyester film was produced. The obtained polyester film was stretched 3.3 times in the machine direction by roll stretching at 90°C to obtain a -axis stretched film.

On the other hand, a water-dispersible acrylic resin in which 2% by weight of carboxyl groups and methylol groups were each introduced into a copolymer resin consisting of 40 mol% methyl methacrylate and 60 mol% methyl acrylate, and silica sol with an average particle size of 0.12 μm. A composition consisting of the following was created. The mixing ratio of the water-dispersible acrylic resin and the silica sol was 97:3 in terms of solid weight ratio. Then, a coating agent having a concentration of 2.0% by weight was prepared by uniformly dispersing this composition in filtered water.

The obtained coating material was applied to one side of the above-mentioned -axis stretched film using a metaling bar at 1 g/n [! The coated layer was dried. Thereafter, the -axially stretched film was stretched 3.6 times in the transverse direction at 100°C, and further relaxed by 2% in the transverse direction.
Heat treatment was performed at 0°C for 5 seconds.

In this way, a 12 μm thick resin film on which a 0.06 μm thick coating layer was laminated was obtained.

The haze value of the obtained resin film was measured.

In addition, the static friction coefficient, wetting tension, and surface resistivity of the coating layer were measured. The results are shown in Table 1.

Next, an adhesive was applied to the polyester film side of the obtained resin film, and the film was laminated with 350 g/% white paperboard to produce a laminate. Note that the adhesive used was a mixture of Seikabond A160 and C46H (manufactured by Dainichiseika Chemical Industry Co., Ltd.) in a ratio of 1=1. Further, the coating amount was 2 g/bo as solid content.

Next, in order to create a box from the laminate, the laminate is placed in a third A.
It was molded into an expanded box as shown in the figure. Then, this laminate was applied to a sack pasting machine to create a box. In addition,
The adhesive to be applied to the glue margin is Lifebond A.
V-650C (manufactured by Nichiei Kako ■) was used. In order to examine the adhesiveness of the glue margin, the adhesive part was peeled off, and as a result, the adhesiveness was so good that the surface of the white paperboard that was bonded to the glue margin was destroyed.

New 1.1 A composition consisting of a copolyester ether resin and silica sol was prepared as a composition for forming a coating layer.

A copolyester ether consisting of terephthalic acid containing 14 mol% of 5-sodium sulfoisophthalic acid and ethylene glycol containing 13 mol% of diethylene glycol was used as the copolyester ether. On the other hand, silica sol has an average particle size of 0.12μ
m was used. The mixing ratio of the copolyester ether and the silica sol was 95% by weight of the copolyester ether and 5% by weight of the silica sol in terms of solid weight ratio.

A coating material 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 side of the same uniaxially stretched film as used in Example 1 using a metaling bar, and a resin film was prepared in the same manner as in Example 1. The haze value etc. of the obtained resin film were measured. The results are 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. A box was made from the obtained laminate by carrying out a sack pasting process in the same manner as in Example 1. Example 1
When the adhesiveness of the glue margin was examined in the same manner as in Example 1,
The adhesion was also good.

1. A composition was prepared in which the mixing ratio of the water-dispersible acrylic resin and silica sol constituting the coating layer composition used in Main Example 1 was 99:1 in terms of solid weight ratio. In this example, a silica sol with an average particle size of 0.10' μm was used. A coating material was prepared by uniformly dispersing the obtained composition in filtered water to a concentration of 1.0% by weight. Using this coating material, a resin film was produced from the same uniaxially stretched film as in Example 1 in the same manner as in Example 1. Regarding the obtained resin film, the haze value etc. were measured in the same manner as in Example 1. The results are shown in Table 1.

Further, a laminate was made from the obtained resin film in the same manner as in Example 1, and a box was made using the obtained laminate by sack pasting. When the adhesiveness of the glue margin was examined in the same manner as in Example 1, good results were obtained as in Example 1.

A uniaxially stretched film was obtained in the same manner as in Example 1 from polyethylene terephthalate pellets to which silicon oxide was added as a lubricant. This -axially stretched film was stretched 3.6 times in the transverse direction at 100°C, and 220
'C for 5 seconds to obtain a resin film with a thickness of 12 μm. Regarding the obtained resin film, the haze value etc. were measured in the same manner as in Example 1. The results are shown in Table 1.

A laminate was prepared in the same manner as in Example 1 using the obtained resin film. An attempt was made to make a box using this laminate by sack pasting, but the box could not be manufactured because the adhesiveness between the glue margin and the white paperboard was insufficient.

1 Comparison 1 One side of the resin film produced in Comparative Example 1 was subjected to corona discharge treatment. Regarding this resin film, the haze value etc. were measured in the same manner as in Example 1. The results are shown in Table 1.

The obtained resin film was bonded to a white paperboard so that the corona discharge treated side faced outward to create a laminate. When a box was manufactured using this laminate by sack pasting in the same manner as in Example 1, the adhesiveness of the glue margin was good.

The uniaxially stretched film produced in Main Example 1 was stretched 3°6 times in the transverse direction at 100°C, and then heat-treated at 220°C for 5 seconds while relaxing 2% in the transverse direction, resulting in a thickness of 12 μm. A resin film was produced. Regarding this resin film, the haze value etc. were measured in the same manner as in Example 1. The results are shown in Table 1.

A laminate was created in the same manner as in Example 1 using the obtained resin film, and a box was manufactured by the sack pasting process in the same manner as in Example 1. Although the adhesiveness of the glue margin was apparently good, the adhesive strength was not strong enough to destroy the white paperboard. Furthermore, since the resin film does not have good slipperiness, the resin film is easily wrinkled or the surface of the resin film is easily scratched during the sack pasting operation.

The haze value and the like were measured in the same manner as in Example 1 for a biaxially oriented polypropylene film (trade name: Nidorefan 3645, manufactured by Toshi) with a thickness of 20 μm.

The results are shown in Table 1.

Seikabond E270 and C30 (manufactured by Dainichiseika Kogyo ■) were applied to one side of this two-wheel stretched polypropylene film.
An adhesive mixed in a ratio of 1:1 was applied, and the same white paperboard as in Example 1 was laminated to create a laminate. The amount of adhesive applied was 2 g/rrf as solid content.

A box was manufactured from the obtained laminate by the sack pasting process in the same manner as in Example 1. The adhesion of the glue margin was apparently good, but it was not strong enough to destroy the surface of the white paperboard.

Example 1 Regarding a two-wheeled stretched polyvinyl chloride film (trade name: HISILEX, manufactured by Mitsubishi Plastics) with a thickness of 15 μm
The haze value etc. were measured in the same manner as above.

The results are shown in Table 1.

One side of this biaxially stretched polyvinyl chloride film was coated with Seikabond U309 and UD-C (manufactured by Dainichiseika Chemical Co., Ltd.).
An adhesive mixed at a ratio of 0:60 was applied, and the adhesive was bonded to white paperboard in the same manner as in Example 1 to create a laminate. In addition,
The amount of adhesive applied was 2 g/rd as solid content.

A box was manufactured from the obtained laminate by the sack pasting process in the same manner as in Example 1. The adhesion of the glue margin was apparently good, but it was not strong enough to destroy the surface of the white paperboard.

Table 1

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view of a resin film for containers with sacks according to an example of the first invention, FIG. 2 is a partial vertical cross-sectional view of a laminate for containers with sacks according to an example of the second invention, and FIG. FIGS. 3F and 3F are diagrams showing the manufacturing process when manufacturing a box by sack pasting using the laminate according to the second invention. 1... Resin film, 2... Polyester film layer, 3... Covering layer, 4... Base paper, 5... Laminate. Diagram

Claims (4)

[Claims] (1) A polyester film layer and a coating layer laminated on the polyester film layer, wherein the layer in a laminated state has a haze value of 1.3% or less, and the coating layer has a static friction coefficient of 1.0 or less. , wetting tension is 47
dyne/cm or more, surface resistivity is 10^1^3Ω/
□Resin film for containers with sacks that is as follows. (2) Claim (2) wherein the coating layer mainly contains a water-soluble or water-dispersible acrylic resin and inorganic inert fine particles.
1) The resin film for containers with sacks attached. (3) Claim (1) wherein the coating layer mainly contains a water-soluble copolyester ether resin and inorganic inert fine particles.
) is a resin film for containers with sacks attached. (4) A laminate for a sack pasted container, comprising: a base paper; and the resin film according to any one of claims (1) to (3), which is laminated on the base paper.