JPH06200063A - Hollow-containing polyester film laminate - Google Patents

Abstract

PURPOSE:To provide a laminate which does not cause troubles due to generation and accumulation of static and is excellent in adhesion to a print layer. CONSTITUTION:The laminate is obtd. by coating at least one side of a nonoriented or monoaxially oriented polyester film contg. a thermoplastic resin insol. in the polyester film with a resin compsn. which mainly comprises a thermally crosslinking monomer and a water-sol. ion-conductive resin obtd. by copolymerizing a monovinyl monomer having a cationic quaternary ammonium salt group on the side chain and a polymerizable double bond at the molecular end, a hydroxylated monovinyl monomer, and another copolymerizable vinyl monomer, and stretching the resulting coated film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester film laminate used as a label, a poster, a recording paper, a wrapping material, and more specifically, it has improved antistatic properties and wettability and adhesiveness with inks and coating agents. And a drawable polyester film laminate containing a large amount of fine voids inside the film.

[0002]

2. Description of the Related Art Synthetic paper, which is a paper substitute mainly made of synthetic resin, has a higher water resistance, a higher dimensional stability in moisture absorption, and a higher dimensional stability than natural paper.
It excels in surface smoothness, gloss and clarity of printing, mechanical strength, etc., and application development is being promoted by making use of these advantages. The main raw material of the synthetic paper is polyethylene,
Polypropylene, polyester, etc. are used,
Among them, polyester represented by polyethylene terephthalate is excellent in that it has high heat resistance and strength, and thus it can be applied to a wide range of applications.

As a method for obtaining a polyester film having a function similar to that of paper, a method in which a large amount of fine voids are contained inside the film, an ordinary flat polyester film is subjected to a sandblast treatment, a chemical etching treatment, or a matting treatment ( A method of roughening the surface by a method of laminating a matting agent with a binder) is known.

Among these, the method of containing a large amount of fine cavities inside the film has the advantage of reducing the weight of the film itself and also imparting appropriate flexibility, which enables clear printing and transfer. It has the advantage that As a method for forming the fine voids inside the film, a thermoplastic resin that is incompatible with polyester is melt-kneaded with an extruder to obtain a sheet in which the thermoplastic resin is finely dispersed in the polyester to further obtain the sheet. There is a method of forming voids around the fine particles by stretching.

As the thermoplastic resin which is incompatible with the polyester for generating voids, there are polyolefin resins (for example, JP-A-49-134755) and polystyrene resins (for example, JP-B-49-2016 and JP-B). No. 54-29550) and polyacrylate resins (for example, Japanese Patent Publication No. 58-28097).

[0006] The biggest problem in producing this void-containing polyester film is electrostatic damage. That is, since the polyester film is an insulator and static electricity is easily generated and accumulated, for example, winding around a roll in a film forming process, printing, adhesion, bag making, packaging, and other secondary processing steps, and electricity to the human body There have been many problems such as shock and difficulty in handling that lead to a reduction in work efficiency, as well as problems such as print whiskers and stains on the film surface that reduce the product value. Further, since the void-containing polyester film has a highly oriented surface, it has a problem of poor adhesion to various inks and adhesives.

For these reasons, various methods have been studied to improve the adhesiveness of the polyester film and to impart antistatic property. As a method of improving the adhesiveness, there are a method of treating the film surface with an actinic ray such as corona discharge, ultraviolet rays and plasma, and a method of applying an easily adhesive resin such as polyester, polyacrylic acid ester and polyurethane. Further, as a method of imparting antistatic properties, a surfactant having antistatic properties, an antistatic agent such as an ionic compound, or kneading a conductive substance such as metal powder or a metal oxide into polyester, There is a method of applying.

[0008] Among these methods, it is easy to add an antistatic agent or a conductive substance when applying the easily adhesive resin so as to simultaneously impart adhesiveness and antistatic property to the coating layer. However, the method of adding a conductive substance is
There is no problem with antistatic agents such as surfactants and ionic compounds that the antistatic property deteriorates in an environment of low humidity, but the antistatic property is required unless a large amount of conductive substance is added to the coating layer. Since the effect is not exhibited, there are problems that the effect of imparting adhesiveness is reduced and the transparency is reduced. In addition, since the conductive material is expensive, there is a problem that the cost increases. For these reasons, the method of using an antistatic agent is generally more common.

On the other hand, as a method for producing a biaxially stretched polyester film having a coating layer for imparting antistatic property and easy adhesion, a coating stretching method (in-line coating method) in which a coating solution is coated and then the film is stretched and heat-treated. There is something called. Compared with the method of forming a coating layer by coating a coating solution on a polyester film after biaxial stretching, this method performs film formation and coating of the film at the same time, so that a wide product can be obtained at a relatively low cost. In addition, it is a useful method because it has a feature that the adhesiveness between the coating layer and the polyester film as the substrate is good.

However, when producing an antistatic polyester film by the in-line coating method,
In general, since the antistatic agent is thermally unstable, volatilization or thermal decomposition occurs in a heat treatment step such as stretching, and the expected antistatic effect is not often exhibited. Therefore, conventionally, a method has been adopted in which an anionic or nonionic compound having good thermal stability is mixed with a binder resin and applied. However, although anionic and nonionic antistatic agents exhibit practical antistatic properties under high humidity, the effect of environmental humidity on antistatic properties is large, and antistatic properties deteriorate under low humidity. There was a problem.

Further, the addition of an antistatic agent causes a problem that the adhesiveness is deteriorated, and the water resistance and solvent resistance of the coating layer are deteriorated. The present situation is that a polyester film having both preventive properties has not been obtained yet.

[0012]

SUMMARY OF THE INVENTION In consideration of the above-mentioned problems of the prior art, the present invention provides an antistatic property to prevent electrostatic damage due to generation and accumulation of static electricity, and inks and coatings. An object of the present invention is to provide a void-containing polyester film laminate for labels, posters and recording papers which is clear and durable for printing, printing, copying, etc. by improving wettability and adhesiveness with agents. .

[0013]

The void-containing polyester film laminate of the present invention which has been able to solve the above-mentioned object is an unoriented or uniaxially oriented polyester film containing a thermoplastic resin insoluble in polyester. , A monofunctional vinyl monomer (X) having a cationic quaternary ammonium salt group on the side chain and a polymerizable double bond at the terminal, and a monofunctional vinyl monomer having a hydroxyl group (Y), a water-soluble ion conductive resin (A) obtained by copolymerizing another polymerizable vinyl monomer (Z) copolymerizable with these monomers, and a thermally crosslinkable monomer ( The gist is that it is obtained by applying a resin composition for forming a coating film containing B) as a main component and then performing stretching. That is, the present invention succeeds in simultaneously providing antistatic property and improving adhesiveness by applying the above resin composition to a polyester film.

[0014]

The polyester in the present invention is an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid or naphthalenedicarboxylic acid or an ester thereof, and a glycol such as ethylene glycol, diethylene glycol, 1,4-butanediol or neopentyl glycol. It is a polyester produced by polycondensation. For these polyesters, a method of directly reacting an aromatic dicarboxylic acid and glycol, a method of transesterifying an alkyl ester of an aromatic dicarboxylic acid and a glycol and then polycondensation, or a method of subjecting a diglycol ester of an aromatic dicarboxylic acid to polycondensation It is produced by a method such as condensation. Typical examples of such polyesters include polyethylene terephthalate, polybutylene terephthalate and polyethylene.
-2,6-naphthalate and the like can be mentioned. These polyesters may be homopolymers or copolymers of a third component, but ethylene terephthalate units, butylene terephthalate units or ethylene-2,6
-Naphthalate unit is 70 mol% or more, preferably 8
A polyester of 0 mol% or more, more preferably 90 mol% or more is used. In the present invention, a polyester-insoluble thermoplastic resin is used to create a large number of cavities in the polyester film.

As the thermoplastic resin insoluble in polyester (hereinafter, referred to as cavity developing agent), any resin insoluble in the above polyester can be used without limitation.
It is preferable that the resin melts at 300 ° C. or lower and that it has good stability at the extrusion temperature. Specifically, polyolefin resins such as polyethylene, polypropylene and polymethylpentene; copolymerized polyolefin resins such as ionomer resins and EP rubber; polystyrene, polystyrene such as styrene-acrylonitrile copolymer and styrene-butadiene-acrylonitrile copolymer. System resin;
Examples thereof include polyarylate resin, polycarbonate resin, polyacrylonitrile resin, and the like. Of these, polyolefin resins and polystyrene resins are particularly suitable.

The void-containing polyester film of the present invention is obtained by first mixing the void-developing agent with the polyester and solidifying into a film. For example,
After mixing the cavity-developing agent and the polyester chips and melt-kneading in the extruder, the mixture is extruded and solidified, or a method of further extruding and kneading the two by kneading both by a kneader and solidifying the polyester, In the polymerization step, it is possible to employ a method in which a void-developing agent is added to polyester, stirred and dispersed, and the resulting chips are melt-extruded and solidified. This polyester film, in the film forming step, depending on the application, pigments, colorants, light stabilizers,
It is also possible to add a fluorescent agent, an antistatic agent, or the like.

The film obtained by solidification is usually in a non-oriented state or a weakly oriented state. In this polyester film, a thermoplastic resin that is insoluble in polyester, which is a cavity-developing agent, is dispersed in various shapes such as a spherical shape, an elliptic spherical shape, or a thread shape. The dispersion diameter is spherical and has a diameter of 0.1 to 30 μm.

The film thus obtained may be stretched between rolls having different speeds (roll stretching) or held by a clip before being spread before or after coating the coating film-forming resin composition described later. At least uniaxially oriented by stretching (tenter stretching) or stretching by air pressure (inflation stretching). At this time, peeling occurs at the interface between the void-developing agent dispersed in the film and the polyester, and many voids are generated in the film.

Therefore, the amount of the void-developing agent mixed with the polyester varies depending on the amount of the targeted voids, but is preferably 1 to 35% by weight with respect to the film. If it is less than 1% by weight, there is a limit to increase the amount of cavities, and flexibility, lightness, and drawability when used as synthetic paper cannot be obtained. On the other hand, if it is more than 35% by weight, the heat resistance and strength of the polyester film are significantly impaired.

The conditions for orienting the polyester film are also closely related to the formation of cavities. For example, in the most commonly performed sequential biaxial stretching step, in the case of the sequential biaxial stretching method in which the molded polyester film is roll-stretched in the longitudinal direction and then tenter-stretched in the width direction, the roll stretching temperature is 50 to It is preferable that the temperature is 140 ° C. and the magnification is 1.2 to 5 times, the tenter stretching temperature is 60 to 150 ° C., and the magnification is 1.2 to 5 times. Furthermore, the void-containing film that has been stretched and oriented can be improved in dimensional stability at high temperatures by heat setting at 130 ° C. or higher, preferably 180 ° C. or higher.

Since the present invention relates to a void-containing polyester film in which voids have been generated by an orientation treatment, it is necessary to orient it at least uniaxially.
The cavity-containing film oriented only in the uniaxial direction is
It is useful as a shrinkable film or an easily tearable film.

In the present invention, an unstretched or uniaxially oriented polyester film has a monofunctional vinyl monomer having a cationic quaternary ammonium base in the side chain and a polymerizable double bond at the terminal on at least one surface. (X), a monofunctional vinyl monomer having a hydroxyl group (Y), and a water-soluble ion obtained by copolymerizing another polymerizable vinyl monomer (Z) copolymerizable with X and Y It is essential that the coating film-forming resin composition containing the conductive resin (A) and the thermally crosslinkable monomer (B) as main components is applied. By applying the coating film-forming resin composition to the surface of the polyester film, it is possible to impart adhesiveness and antistatic property at the same time.

Examples of the monofunctional vinyl monomer (X) having a cation type quaternary ammonium base in the side chain and a polymerizable double bond in the terminal in the ion conductive resin (A) include dimethyl. Aminoethyl acrylate quaternized product, dimethylaminoethyl methacrylate quaternized product, diethylaminoethyl acrylate quaternized product, diethylaminoethyl methacrylate quaternized product, methylethylaminoethyl acrylate quaternized product, methylethylaminoethyl methacrylate quaternized product, dimethylaminostyrene Examples thereof include quaternary compounds and methylethylaminostyrene quaternary compounds, and one or more of these can be used.

Further, examples of the monofunctional vinyl monomer (Y) having a hydroxyl group include 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate, which are copolymerizable with the above (X) and (Y). Examples of the other polymerizable vinyl monomer (Z) include alkyl acrylates such as methyl acrylate and ethyl acrylate, methacrylic acid alkyl esters such as methyl methacrylate and ethyl methacrylate, styrene, vinyltoluene and vinyl acetate. Vinyl monomers of

The above monofunctional vinyl monomer (X), monofunctional vinyl monomer (Y), and other polymerizable vinyl monomer (Z)
The ion-conductive resin (A) can be obtained by copolymerizing the above with a conventionally known radical polymerization, and the copolymerization ratio of these is in the range of 5/1 to 2/1 as the polymerization ratio of (Y + Z) / X. preferable. If this polymerization ratio exceeds 5/1, the water solubility of the ion conductive resin (A) will decrease, or a monofunctional vinyl for introducing a cation type quaternary ammonium salt group into the ion conductive resin (A). As a result, the ratio of the monomer (X) is reduced, so that a coating film excellent in antistatic property cannot be obtained. On the other hand, when the copolymerization ratio is less than 2/1, the water resistance of the coating film tends to decrease, and the tackiness and blocking properties of the obtained coating film increase.

The polymerization ratio of (X + Z) / Y is 10
The range of / 1 to 15/1 is preferable, and the polymerization ratio is 15
When it exceeds / 1, the monofunctional vinyl monomer (Y) having a hydroxyl group is reduced, and the number of hydroxyl groups serving as a crosslinking point with the below-mentioned thermally crosslinkable monomer (B) is reduced, resulting in insufficient crosslinking. Therefore, the water resistance and solvent resistance of the coating film decrease. On the other hand, when the polymerization ratio is less than 10/1, the number of hydroxyl groups becomes too large, and the water resistance and solvent resistance of the coating film also deteriorate.

The heat-crosslinkable monomer (B) which constitutes the coating film forming resin composition together with the ion conductive resin (A) is a monomer which is reactive with the hydroxyl group in the monomer (Y). It is not particularly limited as long as it is a body, but an epoxy compound having 2 to 4 glycidyl groups is preferably used. Specific examples of such an epoxy compound include, for example, ethylene glycol glycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether,
Glycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether, diglycerol polyglycidyl ether and the like can be mentioned, and one or more of these can be used.

The compounding ratio of the ion conductive resin (A) and the heat-crosslinkable monomer (B) in the resin composition for forming a coating film of the present invention is such that A / B is 70/30 by weight. A range of 97/3 is preferred. When the blending ratio is less than 70/30, the heat-crosslinkable monomer (B) becomes excessive, so that the water resistance and solvent resistance of the resulting coating film are improved, but the antistatic property is deteriorated and Spreadability is reduced. If the blending ratio exceeds 97/3, the amount of the heat-crosslinkable monomer (B) decreases and the crosslinking reactivity decreases, so that the water resistance / solvent resistance of the coating film deteriorates, and also the coating film It is not preferable because the spreadability is lowered and the antistatic property is deteriorated.

In the present invention, when a coating film is formed using the above coating film forming resin composition, in order to accelerate the crosslinking reaction of the epoxy compound constituting the thermally crosslinkable monomer (B). In addition, it is desirable to use a small amount of an organic or inorganic water-soluble alkali compound such as amine, polyamine, amidoamine, polyamidoamine, imidazole, alkali metal carbonate, and derivatives thereof as a crosslinking accelerator.

In the present invention, since the ion conductive resin (A) is water-soluble, it is preferable to use the coating film-forming resin composition in an aqueous solution, but alcohol is used for the purpose of improving wettability with polyester. You may use together organic solvents, such as. Further, in the coating film forming resin composition, if necessary, other crosslinking agents, catalysts, wetting agents, etc. and ultraviolet absorbers, pigments, organic fillers, inorganic fillers, lubricants within a range that does not impair the object of the present invention. Agents, antiblocking agents, etc. may be added. It is also possible to improve the properties such as adhesiveness and blocking property by using other binder resins together.

The void-containing polyester film laminate of the present invention comprises a solution of the resin composition for forming a coating film obtained by applying at least one surface of the above-described unoriented polyester containing the void-developing agent or already uniaxially oriented void-containing polyester. It is manufactured by applying to. As a method for providing a coating layer, a gravure coat method, a kiss coat method, a dip method, a spray coat method, a curtain coat method,
A commonly used method such as an air knife coating method, a blade coating method or a reverse roll coating method can be applied. As the step of applying, a method of applying on the film surface before the orientation treatment in advance, a method of applying on the uniaxially oriented film surface and further orienting it in the perpendicular direction (in-line coating method) can be adopted. The biaxially stretched film is wide, and the running speed of the film is so high that it is difficult to apply the film uniformly, and the film is thermally crosslinked by heat setting during orientation, which is not preferable.

The coating film-forming resin composition according to the present invention is applied to one surface of a polyester film because the antistatic property is exhibited not only on the coated surface but also on the non-coated surface when it is applied to one surface of the polyester film. If so, the antistatic performance of the film will be sufficiently excellent, but if it is applied to both sides, the adhesiveness will be improved on both sides. Alternatively, a method may be adopted in which the coating film-forming resin composition is applied to one surface and another binder resin layer having a property of improving adhesiveness is applied to the surface opposite to the applied surface. .

The coating amount of the coating film-forming resin composition applied to the polyester film is preferably 0.01 to 5 g / m ² as the solid content present on the film after biaxial stretching. When the coating amount is less than 0.01 g / m ² , sufficient antistatic properties cannot be obtained, and when coating is 5 g / m ² or more, blocking becomes a problem. The thickness of the polyester film itself used in the present invention is determined according to the application of the magnetic card, but generally 100 to 500 μm is preferably used.

Before applying the solution of the resin composition for forming a coating film, for example, a corona discharge treatment is applied to the film to improve the coatability of the solution or the adhesion between the film and the coating film. It doesn't matter. Further, the wettability and adhesiveness of the film surface can be improved by further subjecting the coating layer to corona discharge treatment, corona discharge treatment under a nitrogen atmosphere, ultraviolet irradiation treatment, and the like.

[0035]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples, and is within a range not departing from the spirit of the present invention. Modifications and implementations are included in the present invention. The measurement methods and evaluation methods performed in the examples are as follows.

(1) Intrinsic viscosity of polyester Polyester was dissolved in a mixed solvent of phenol (6 parts by weight) and tetrachloroethane (4 parts by weight) and measured at 30 ° C. (2) Melt flow index of polystyrene resin (cavity-developing agent) Measured at 200 ° C. under a load of 5 kg according to JIS K-7210. (3) Melt Flow Index of Crystalline Polypropylene Resin (Cavity Developing Agent) Measured at 230 ° C. under a load of 2.16 kg according to JIS K-6758. (4) Apparent specific gravity of the film The film is accurately cut into a square of 5.00 cm × 5.00 cm, and the thickness is measured at 50 points to obtain an average thickness t (μm).
The weight was measured up to 0.1 mg as W (g) and calculated by the following formula. Apparent specific gravity (−) = W / (5 × 5 × t × 10000)

(5) Cavity content of film Calculated by the following formula. Cavity content (volume%) = 100 × (1-true specific volume / apparent specific volume) However, true specific volume = x ₁ / d ₁ + x ₂ / d ₂ + x ₃ / d ₃ +… + x ₁ / d ₁ + ... Apparent specific volume = 1 / apparent specific gravity of film In the above equation, x ₁ represents the weight fraction of the i component, and d ₁ represents the true specific gravity of the i component.

The true specific gravity values used in the calculations in the examples are polyethylene terephthalate 1.40, anatase type titanium dioxide 3.90, general-purpose polystyrene resin 1.05, and crystalline polypropylene resin 0.91.

(6) Concealing property of film containing voids According to JIS K6714, the light transmittance of the film was measured using a Poic integrating sphere HTR meter (manufactured by Nippon Seimitsu Optical Co., Ltd.). The smaller this value is, the higher the concealing property is. The commonly used electrostatographic pulp paper is 27%. (7) Drawability with Pencil Whether or not handwritten drawing of the void-containing film was performed was judged with a mechanical pencil using Uni 0.5-100HB mechanical pencil refill (manufactured by Mitsubishi Pencil). (8) Surface resistivity Takeda Riken resistivity tester with applied voltage of 500V, 2
It was measured under the conditions of 3 ° C. and 50% RH.

(9) Evaluation of Water Resistance and Solvent Resistance The film was dipped in each solvent and left for 16 hours at room temperature (26 ° C.) to measure the surface resistance. (10) Adhesion with water-based ink Aqua color 39 indigo (manufactured by Toyo Ink Mfg. Co., Ltd.) was applied as a water-based ink on a sample film with a gravure coater so that the thickness after drying was 3 μm, and the ink and film were dried. The adhesiveness of each was examined by a cellophane tape peel test. After sticking the cellophane tape on the printed surface, keep the film flat and peel the cellophane tape in the direction of about 150 °, and measure the remaining area of ink on the printed surface of the sample film with the image processor Luzex IID (manufactured by Nireco). And displayed as a percentage. The larger the remaining area, the better the adhesion.

Example 1 (1-1) Production of coating film forming resin composition Methyl methacrylate (MMA) / ethyl acrylate (EA) / 2-hydroxyethyl methacrylate (HEMA) / dimethylaminoethyl methacrylate quaternary according to a conventional method. Compound (DM) as a weight composition ratio of 47/21 /
Copolymerization was carried out at a ratio of 7/25 to obtain an aqueous solution of a water-soluble ion conductive resin. To this aqueous solution, glycerol polyglycidyl ether (GPGE) was added as an epoxy compound in an amount of 4% by weight based on the solid content of the ion conductive resin, and 2-methylimidazole was added as a crosslinking accelerator to the glycerol polyglycidyl ether. 5% by weight was added and mixed to obtain an aqueous solution of a resin composition for forming a coating film having a solid content of 7% by weight.

(1-2) Preparation of void-containing polyester film laminate 82% by weight of polyethylene terephthalate resin having an intrinsic viscosity of 0.62 as raw materials, 8% by weight of anatase type titanium dioxide, and melt flow index of 3.0 g / 10
10% by weight of general-purpose polystyrene having an amount of extracted n-hexane of 4.5% by weight is melt-extruded at 285 ° C. from a T-die by a twin-screw extruder and electrostatically adhered to a cooling rotary roll to solidify. And continue to 80 ℃ with a roll drawing machine
Was longitudinally stretched 3.0 times. Corona discharge treatment is applied to the surface of the stretched film, and (1-
The coating film-forming resin composition solution prepared in 1) was applied by an air knife method and dried with hot air at 70 ° C. Next, the film was transversely stretched 3.2 times at 130 ° C. with a tenter and heat-set at 220 ° C. to have a thickness of 57 μm (resin composition layer 0.20 μm).
To obtain a white polyester film laminate. The characteristics of the obtained polyester film are shown in Table 2.

Examples 2 to 5 Polyester film laminates were obtained in the same manner except that the composition of the coating film-forming resin composition of Example 1 was changed as shown in Table 1. The results of characteristic evaluation are also shown in Table 2.

Example 6 A polyester film laminate was obtained in the same manner as in Example 1, except that crystalline polypropylene was used instead of polystyrene in the melt flow index of 2.5 g / 10 min. The characteristic evaluation results are shown in Table 2.

Example 7 Except that the anatase type titanium dioxide compounding was stopped in Example 1, the polyethylene terephthalate resin compounding amount was increased, and the coating film forming resin composition used in the method of Example 4 was used. A polyester film laminate was obtained in the same manner as in Example 1. The characteristic evaluation results are shown in Table 2.

Comparative Examples 1 to 3 Polyester film laminates were obtained in the same manner except that the composition of the coating film forming resin composition of Example 1 was changed as shown in Table 1. The results of characteristic evaluation are also shown in Table 2. Comparative Example 4 Same as Example 1 except that a coating solution was prepared by mixing the resin (A) of Comparative Example 2 in Table 1 and a commercially available anionic antistatic agent consisting of sodium sulfonate at a ratio of 8/2. Then, a polyester film laminate was obtained. The results of characteristic evaluation are also shown in Table 2.

Comparative Example 5 A polyester film laminate was obtained in the same manner except that the aqueous solution of the coating film forming resin composition of Example 1 was not applied.
The results of characteristic evaluation are also shown in Table 2. Comparative Example 6 A polyester film laminate was obtained in the same manner as in Example 1 except that the compounding of the cavity-developing agent polystyrene was discontinued and the compounding amount of polyethylene terephthalate was increased accordingly. The characteristic evaluation results are shown in Table 2.

[0048]

[Table 1]

MMA: methyl methacrylate EA: ethyl acrylate HEMA: 2-hydroxyethyl methacrylate DM: dimethylaminoethyl methacrylate quaternary product GPGE: glycerol polyglycidyl ether DPGGE: diglycerol polyglycidyl ether

[0050]

[Table 2]

Each of the void-containing polyester film laminates obtained in Examples 1 to 7 had a paper-like appearance and could be drawn with a pencil. Further, it was a high quality product which was excellent in adhesiveness with water-based ink, water resistance and solvent resistance, and had small surface resistance and excellent antistatic property. On the other hand, in Comparative Example 1, the spreadability of the coating film was poor and the coating was uneven. The sample film of Comparative Example 2 has good antistatic properties, but poor water resistance and solvent resistance.
The sample film of 1 was inferior in antistatic property. The sample film of Comparative Example 4 in which a commercially available antistatic agent was mixed was inferior in all of antistatic property, water resistance, solvent resistance and adhesiveness. The non-coated Comparative Example 5 was inferior in antistatic property and adhesiveness. Comparative Example 6 had a low void content of 1% and could not be drawn with a pencil.

[0052]

INDUSTRIAL APPLICABILITY The void-containing polyester film laminate of the present invention, like the void-containing polyester film obtained by using conventional polystyrene or polypropylene as a void-developing agent, does not exist in a normal void-free polyester film and is lightweight. In addition to having properties, flexibility, hiding power, matteness, drawing properties, etc., it has superior antistatic properties and adhesive properties compared to conventional void-containing polyester films. Therefore, the void-containing polyester film laminate of the present invention can be manufactured and processed without causing electrostatic damage, and high-quality label excellent in durability and clear in printing and printing,
We were able to provide posters, recording paper, packaging materials, printing paper, magnetic recording cards, etc.

Claims (1)

[Claims] 1. An unoriented or uniaxially oriented polyester film containing a thermoplastic resin which is insoluble in polyester has a cation-type quaternary ammonium base on its side chain and is polymerized at the terminal. Functional vinyl monomer (X) having a double bond, monofunctional vinyl monomer having a hydroxyl group (Y), and another polymerizable vinyl monomer copolymerizable with these monomers ( By applying a coating film-forming resin composition containing a water-soluble ion conductive resin (A) and a heat-crosslinkable monomer (B) as main components obtained by copolymerizing Z) A void-containing polyester film laminate, which is obtained.