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The present invention relates to a biaxially oriented polyester film having excellent secondary processability and having a specific coating layer on at least one side of the polyester film. More specifically, the present invention relates to a biaxially oriented polyester film with good adhesive properties, which is provided with a coating layer made of a specific chloroprene resin and a specific polyester resin on at least one side of the polyester film. Biaxially oriented polyester films, especially biaxially oriented polyethylene terephthalate films, have excellent transparency, dimensional stability, mechanical properties, heat resistance, electrical properties, gas barrier properties, chemical resistance, etc., and are used as packaging materials, electrical insulation, etc. Photosensitive materials using materials, metal vapor deposition materials, silver salts, diazo compounds, photosensitive resins, etc.
Used as a base material for drafting materials, electrophotographic materials, magnetic recording materials, etc. In these applications, biaxially oriented polyester films are required to have adhesive properties. for example,
For packaging materials, adhesiveness with printing ink and laminating materials; for photosensitive materials, adhesiveness with photosensitive layers with binders such as gelatin and polyvinyl alcohol;
Metal vapor deposition materials are required to have adhesion to the vapor deposited metal, and magnetic recording materials are required to have adhesion to the magnetic layer. Methods for improving the adhesion of biaxially oriented polyester films include copolymerization of specific polyester-forming components, methods using compositions containing specific resins, flame treatment, corona discharge treatment, plasma discharge treatment, ultraviolet ray treatment, etc. Methods using surface treatments such as irradiation treatment and chemical treatment using specific organic compounds or inorganic compounds are known. However, copolymerization,
Methods using compositions and surface treatments may have adhesive properties that change over time, may only adhere to specific objects, or may not have high adhesive strength even if they have adhesive properties, making them difficult to use for the purposes mentioned above. is not necessarily a satisfactory method. For this reason, usually a suitable coating agent is applied to the film as an undercoat depending on the purpose.
Currently, it is being put into practical use. However, in general, coating agents that have adhesive properties with biaxially oriented polyester films have poor adhesive properties with surface layer materials, especially water-soluble resins such as polyvinyl alcohol; often have the disadvantage of poor adhesion to biaxially stretched polyester films. Further, even if a coating agent has good adhesion to both a biaxially oriented polyester film and a specific surface layer material, it does not necessarily have good adhesion to many of a wide variety of surface layer materials. In addition, even if the coating agent has good adhesion to the biaxially oriented polyester film and the surface layer material, the coating agent has poor wettability to the polyester film.
Problems may arise in secondary processability, such as inability to apply uniformly, poor handling of the film with the coating layer due to its charging properties, and poor coating properties when applying the surface layer material. many. These problems are also caused by various restrictions on the use of water-soluble or water-dispersed coating agents, rather than organic solvent solution types, for reasons such as occupational safety and health, pollution, resource conservation, and energy conservation. ing. For example, water-soluble or water-dispersible polyester resins containing sulfonic acid groups have good coating properties, adhesion properties, and chargeability of the coated film to polyester films;
It has low adhesion to certain surface materials, and has poor blocking properties (hereinafter abbreviated as adhesion) between the coating layer and the polyester film or between the coating layers due to moisture absorption. On the other hand, water-dispersible chloroprene resin has poor coating and adhesion properties to polyester films. However, the present inventors have found that a coating agent containing this polyester resin and chloroprene resin has good coating and adhesion properties to polyester films, and that films provided with this coating layer have conventionally been difficult to adhere to. The present inventors have discovered that the adhesive has good adhesion to various surface materials including polyvinyl alcohol, which has led to the present invention. That is, the present invention provides a biaxially oriented polyester film obtained by coating at least one side of a polyester film containing polyethylene terephthalate as a main component with a water-soluble or water-dispersible polyester resin containing a water-dispersible chloroprene resin and a sulfonic acid group. Regarding. The polyester film constituting the substrate of the present invention is a polyethylene terephthalate film in which 90 mol% or more of its constituent units are ethylene terephthalate. The water-soluble or water-dispersible polyester resin having a sulfonic acid group (hereinafter abbreviated as polyester resin) used in the present invention is
No. 47-40873, Japanese Patent Application Publication No. 1983-83497, Japanese Patent Application Publication No. 1983-
Polyesters known in No. 121336, JP-A-52-155640, etc., or polyesters similar thereto can be used. For example, the dicarboxylic acid component of polyester is
Examples of aromatic dicarboxylic acids include terphthalic acid,
Isophthalic acid, 2,5-naphthalene dicarboxylic acid and their ester-forming derivatives are used. Examples of aliphatic dicarboxylic acids include adipic acid, azelaic acid, sebacic acid and their ester-forming derivatives. Examples of monocarboxylic acids include oxybenzoic acid and its ester-forming derivatives. Further, as the glycol component of polyester, aliphatic, alicyclic, aromatic diols, etc. can be used, and examples thereof include ethylene glycol, 1,4
-Butanediol, diethylene glycol, triethylene glycol, 1,4-cyclohexanedimethanol, p-xylene diol, etc. are used, and examples of poly(oxyalkylene) glycols include so-called polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc. used. Polyesters include not only saturated linear polyesters consisting of the above-mentioned ester-forming components, but also
A polyester consisting of a compound containing an ester-forming component having a valence of 3 or higher or a polyester having a reactive unsaturated group can also be used. A polyester having a sulfonic acid group can be produced using a compound having a sulfonic acid group that can be used as a polyester component together with the above-mentioned polyester forming component. Examples of compounds having sulfonic acid groups include:
Sulfoisophthalic acid, sulfoterephthalic acid, 4-
There are metal salts such as sulfonaphthalene-2,7-dicarboxylic acid and its ester-forming derivatives.
Preferred examples of metals for the metal salt include lithium, sodium, potassium, and magnesium.
Among these, a very suitable compound is 5-
Sodiosulfoisophthalic acid or sodiosulfodimethyl isophthalate. Another method for introducing sulfonic acid groups into polyester is to sulfonate the unsaturated groups of polyester containing an ester-forming aliphatic unsaturated compound as a copolymerization component with a sulfonating agent such as sodium bisulfite or sodium metabisulfite. Methods can also be exemplified. The amount of aromatic dicarboxylic acid in the dicarboxylic acid component of the polyester resin is preferably in the range of 50 mol% to 100 mol%. This is to increase the softening point of the polyester resin and improve its adhesion. The sulfonic acid group in the polyester resin must be present in an amount necessary to make the resin water-soluble or water-dispersible, and the dicarboxylic acid having the sulfonic acid group must be present in an amount of 2 mol% to 20 mol% of the dicarboxylic acid.
It is preferable to use it within the range of . If the amount of sulfonic acid base is less than 2 mol%, water solubility or water dispersibility will be insufficient, and if the amount of sulfonic acid group is more than 20 mol%, the water resistance of the undercoat layer after coating may be poor, or the film may absorb moisture. This is because they tend to stick together. The water-dispersible chloroprene resin (hereinafter referred to as chloroprene resin) used in the present invention is described in "Revised New Edition Synthetic Rubber Handbook" edited by Kambara et al.
The method shown in pages 258 to 281, published by Asakura Shoten, November 1964, or a method similar thereto can be used. Specifically, chloroprene latexes include neoprene (trade name) from DuPont or Showa Neoprene, Denka chloroprene (trade name) from Denki Kagaku Kogyo, and Skyprene latex (trade name) from Toyo Soda Kogyo.
A commercially available chloroprene homopolymer or copolymer can be used. In the case of water-dispersible resin, the particle size of the water-dispersed particles is
It is 5Ό or less, preferably 1Ό or less, and more preferably 0.1Ό or less. If the particle size is large,
There are problems such as agglomeration of particles during the coating process and poor film transparency and gloss. Furthermore, if it is necessary to reduce the thickness of the coating layer, the particle size must be reduced accordingly. The ratio of chloroprene resin to the total amount of polyester resin and chloroprene resin in the coating layer is:
The solid content is 30% to 99% by weight, preferably 50% to 95% by weight. If the proportion of chloroprene resin is small, the adhesion to the surface layer material such as polyvinyl alcohol will be reduced, and since there is a large amount of polyester resin, sticking will likely occur due to moisture absorption. If the proportion of the polyester resin is small, the coating properties and adhesion of the coating agent to the polyester film will decrease. Methods for applying chloroprene resin and polyester resin include a method in which a polyester film is previously coated with polyester resin and then chloroprene resin is applied, and a method in which chloroprene resin and polyester resin are blended and applied. Apparatuses for applying coating agents to polyester films include, but are not limited to, reverse coaters, gravure coaters, rod coaters, and air doctor coaters as shown in "Coating Method" by Yuji Harasaki, published by Maki Shoten in October 1979. It's not something you can do. The timing for applying the coating agent to the polyester film is before biaxial stretching, after biaxial stretching, or immediately before applying the surface layer material. Especially preferably
A coating agent is applied to a uniaxially stretched polyester film using the roll stretching method as exemplified in No. 8470, and the film is immediately stretched in a direction perpendicular to the previous stretching direction, with or without appropriate drying, and heat treated. (hereinafter abbreviated as coating and stretching method).
If the coating and stretching method is used, it is possible to dry the coating layer at the same time as stretching, and by stretching the coating layer, the coating thickness can be reduced, and it is possible to create wide widths, which was difficult with methods other than the coating and stretching method. A laminated film is obtained. Note that it is also possible to improve the applicability and adhesion of the coating agent to the polyester film by subjecting the polyester film before the coating treatment to surface treatment such as corona discharge treatment. Furthermore, by subjecting the biaxially stretched polyester film of the present invention to surface treatment such as corona discharge treatment, the adhesion to the surface layer material can be further improved. The thickness of the coating layer on the biaxially stretched polyester film is preferably in the range of 0.01Ό to 5Ό, more preferably in the range of 0.01Ό to 1Ό. If the thickness of the coating layer is less than 0.01 Όm, it is difficult to coat the coating uniformly, resulting in uneven coating on the product and insufficient adhesion in various applications. If the thickness of the coating layer exceeds 5 Όm, the films tend to stick to each other, or the stiffness of the film becomes low compared to the overall thickness of the film. The coating layer of the biaxially oriented polyester film of the present invention may optionally contain adhesion improvers, coating improvers, antifoaming agents, ultraviolet absorbers, antioxidants, antistatic agents, lubricants, and inorganic fine particles. , dyes, pigments, etc. may be contained. Furthermore, since the coating agent uses water as a medium, water-soluble resins such as gelatin, cellulose resins, polyethers, silicone resins, epoxy resins, vinyl resins, urethane resins, and polyamide resins and water-dispersible resins are used in the coating layer. It can also contain a resin. In order to improve the adhesion, water resistance, solvent resistance, mechanical strength, etc. of the coating layer, crosslinking agents that are commonly used for crosslinking chloroprene resins, as well as general methylolated or alkylolated urea type, Aqueous solutions or dispersions of resins such as melamine, acrylamide, and polyamide, epoxy compounds, and block polyisocyanates may also be used. The thickness of the biaxially stretched polyester film of the present invention is from 5Ό to 500Ό. The biaxially stretched polyester film of the present invention is
It has improved adhesion to various surface materials and is useful as a base material for packaging materials, photosensitive materials, drafting materials, electrophotographic materials, magnetic recording materials, etc. Especially when polyvinyl alcohol is used as a base material for water-soluble materials such as gelatin. It is useful for applications using surface materials that use resin as a binder. The present invention will be explained below with reference to Examples. Note that the evaluation in the examples is based on the method described below. 1. Applicability The applicability when applying a coating agent to a polyester film was evaluated based on the following criteria. ã: Can be applied uniformly, causing no practical problems. Î: Poor wettability, with some repellency observed on the coated surface. Ã: Poor wettability and repels coating agent. 2. Transparency Transparency was evaluated based on the following criteria using an integrating sphere light transmittance measuring device or visual observation. â: There is no practical problem. â³: There are uses that pose a practical problem. Ã: Not practically usable. 3 Adhesiveness Adhesion between the base polyester film of the biaxially stretched polyester film provided with the coating layer of the present invention and the coating agent layer, and further adhesiveness between the biaxially stretched polyester film of the present invention and the surface layer materials shown in Table 2. was evaluated using the following method. A 7 cm long piece of cellophane tape made by Nichiban Co., Ltd. with a width of 18 mm is applied to the coated layer of the film to prevent air bubbles from entering, and a constant load is applied thereto using a 3 kg manual load roll. Adhesion was evaluated by fixing the film, connecting one end of the cellophane tape to a 500 g weight, allowing the weight to fall naturally over a distance of 45 cm, and then starting a peel test in a 180° direction. Adhesion was evaluated using the following 5-level criteria. 3 or more is a practical range. 5: No peeling at all on the cellophane tape surface. 4: Less than 10% peels off from the cellophane tape surface. Practically speaking, if the index is 4 or more, it can be used without any problem. 3: 10 to 50% of the part peels off to the cellophane tape side. 2: More than 50% of the area peels off to the cellophane tape side. 1: Completely peel off to the cellophane tape side. 4. Adhesion The adhesion (blocking) test was carried out by overlapping the polyester film surface and the coated surface, or the coated surfaces together, at a temperature of 20°C or 40°C, and a load of 50 g/cm.
cm 2 or 100 g/cm 2 for 20 hours. The criterion for evaluation is a method of visually observing what percentage of the total area of the film is occupied by the fixed portion. Comparative Example 1 A biaxially stretched polyester terephthalate film having a thickness of 50 Όm was coated with various coating agents shown in Table 2 at a concentration of 5% by weight using a #8 rod, and dried at 80° C. for 2 minutes. The thickness of this coating layer was 0.6Ό. The adhesion between the biaxially oriented polyester terephthalate film and the coating agent was poor as shown in Table 1.
It was found that the biaxially stretched polyethylene terephthalate film cannot be put to practical use as it is. Comparative Example 2 Neoprene 750 (trade name), a water-dispersible chloroprene resin manufactured by Showa Neoprene Co., Ltd., was applied at a concentration of 10% by weight to a biaxially stretched polyethylene terephthalate film having a thickness of 50 ÎŒm using a #8 rod. However, the coating properties of the coating agent were extremely poor, and it could not be put to practical use as it was. Comparative Example 3 Coating was carried out in the same manner as in Comparative Example 2, except that Neoprene 842A (trade name), a water-dispersible chloroprene rubber manufactured by Showa Neoprene Co., Ltd., was used instead of Neoprene 750 (trade name) in Comparative Example 2. However, the coating properties of the coating agent were extremely poor, and it could not be put to practical use as it was. Comparative Example 4 A biaxially oriented polyethylene terephthalate film with a thickness of 50 ÎŒm was coated with Finetex ES-670, a water-dispersible polyester resin manufactured by Dainippon Ink and Chemicals.
(trade name) was applied at a concentration of 10% by weight using a #8 rod. The coating properties of the coating agent on the biaxially stretched polyester terephthalate film were extremely good. The thickness of this coating layer was 1.2Ό. However, the evaluation results of the adhesion of this film are as follows.
It was defective. Incidentally, it has been found that when a large amount of film is coated, the film is wound into a roll, and stored in a normal room, the stickiness is greater at both ends and the surface layer, and it is more likely to stick due to moisture absorption. Various coating agents shown in Table 2 were applied to the coating layer surface of this film in the same manner as in Comparative Example 1, and the adhesion was evaluated. As shown in Table 1, the adhesion of this film was completely poor to any of the three types of polyvinyl alcohol coating agents. That is, this film had poor adhesion and was only adhesive to a specific coating agent, and could not be put to practical use as it was. Example 1 A biaxially stretched polyethylene terephthalate film with a thickness of 50 ÎŒm was coated with Finetex ES-670, a water-dispersible polyester resin manufactured by Dainippon Ink and Chemicals.
(Product name) 20 parts (solid weight) and Showa Neoprene's water-dispersible chloroprene resin Neoprene 750
(trade name) 80 parts (solid weight) of an aqueous dispersion with a concentration of 10% by weight was applied using a #8 rod and dried at 80°C for 2 minutes. The coating agent had good applicability to the biaxially stretched polyethylene terephthalate film. The thickness of the coating layer of this film was 1.2Ό. Various coating agents shown in Table 2 were applied to the coating layer surface of this film at a concentration of 5% by weight using a #8 rod and dried at 80°C for 2 minutes. The thickness of this coating layer was 0.6Ό. The adhesion between various coating agents and the biaxially oriented polyester film of the present invention is good as shown in Table 1, and can be put to practical use. Example 2 Example 1 except that Neoprene 842A (trade name), a water-dispersible chloroprene resin manufactured by Showa Neoprene Co., Ltd., was used instead of Neoprene 750 (trade name) in Example 1.
It was carried out in the same way. The coating properties of the coating agent on biaxially oriented polyethylene terephthalate were good. The adhesion between the various coating agents shown in Table 2 and the biaxially oriented polyester film of the present invention is good as shown in Table 1, and can be put to practical use. Example 3 Polyethylene terephthalate with an intrinsic viscosity of 0.65
It was melted at 285°C and extruded onto a cooling drum at 60°C to form a film. This film was stretched 3.5 times in the longitudinal direction with a roll at about 95°C to obtain a film with a thickness of 185Ό. This film was further coated with the coating agent of Example 1 and 0.5 part (solid weight) of Megafuc F-116 (trade name), a fluorine-based surfactant manufactured by Dainippon Ink and Chemicals.
was mixed and applied at a concentration of 10% by weight. This film was stretched 3.7 times in the transverse direction at 110°C and heat-treated under tension at 220°C. The biaxially stretched polyester film thus obtained had a polyethylene terephthalate film layer of 50Ό and a coating layer of 0.24Ό. The coating layer of this biaxially stretched polyester film has good uniformity, appearance, transparency, and adhesion.
The adhesion with the coating agent shown in Table 2 was also evaluated in the same manner as in Example 1, and as a result, as shown in Table 1, it was good, and this film can be put to practical use.
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