JPH0768716A - Manufacture of film with fluorine resin film - Google Patents

Abstract

PURPOSE:To obtain a low-cost film of fluorine resin film of high quality by coating a process sheet with the resin, and then drying it, then forming a main film of vinyl chloride or polyurethane in the fluorine resin film by casting, and forming it in a desired thickness. CONSTITUTION:A process sheet 5 in which a surface is release-treated is coated with fluorine resin solution, and dried to form a fluorine resin film 1. A film is formed by a casting film with solution of sol of vinyl chloride polymer or solution of polyurethane resin on the dried film 1, coated by a comma coater, dried to form a main film 2, and wound in a rolled state. Since the film 1 is dried, the film of the film 2 is not necessarily overdried. This roll is released in another step, adhesive coated and dried on release sheet 4 is transferred to the film 2 to form an adhesive layer 3, and then the sheet 5 is peeled to obtain a film having the film 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a film having a fluororesin film, which is used as a marking film, for example.

[0002]

2. Description of the Related Art Conventionally, for example, a vinyl chloride marking film attached to an outdoor signboard is easily soiled by dust and the like, and it is difficult to wash off the adhered soil, and the gloss decreases with the passage of time. Because of the drawbacks, it has been practiced to laminate a film of a fluororesin on the surface of the marking film or to apply a fluororesin.

[0003]

When the above-mentioned fluororesin film is laminated on a marking film, the total thickness of the film is increased, and as a result, the rigidity is increased and the flexibility required for the marking film is impaired. In addition, the processing cost is high. Also, when a solution of a fluorine-based resin is applied to the marking film, the solvent in the solution penetrates into the resin of the marking film and does not easily dry so that the marking film is likely to remain, and when the created marking film is wound up, the marking film is not applied to the back surface of the marking film. The fluorine-based resin film becomes difficult to use due to blocking, and when the drying temperature is raised to dry the permeated solution, the heat shrinkage of the film becomes large, resulting in the disadvantage that the quality deteriorates.

An object of the present invention is to provide a method for producing a film having a high quality fluororesin film which can be processed into a desired thickness without such inconvenience and which is inexpensive.

[0005]

According to the present invention, a fluorocarbon resin is coated on a process paper and dried, and subsequently a vinyl chloride or polyurethane main film is formed on the fluorocarbon resin film by casting. Thus, the above-mentioned object is achieved. If a pressure-sensitive adhesive layer is further formed on the formed vinyl chloride or polyurethane main film, a marking film having good weather resistance and antifouling properties can be produced without problems in processability.

[0006]

[Function] Since the fluororesin film is dried, even if a vinyl chloride or polyurethane resin film is formed on the fluororesin film, the fluororesin film may be formed on the vinyl chloride or polyurethane main film during or after drying. The used organic solvent does not migrate to the main film, prevents blocking and shrinkage of the surface of the main film, and the fluororesin film is thin, so that the entire film can be formed to a desired thickness. The main film can be easily formed by a coating machine, and a high-quality and inexpensive film having a fluororesin film can be obtained.

[0007]

EXAMPLE An example of the method of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged view of a partial cross section of a film produced by the method of the present invention. In the figure, reference numeral 1 is a dry fluororesin. The film 2 is a main film formed on the dried fluororesin film 1, on which the pressure-sensitive adhesive layer 3 covered with a release paper 4 is formed.

For the fluorine-based resin film 1, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, a blend thereof, or a blend of these fluororesins with an acrylic resin is used. An ultraviolet absorber may be added to the fluororesin film 1 in order to further improve the weather resistance of the main film 2. In the method of the present invention, first, the solution of the above-mentioned fluororesin is used as shown in FIG.
As shown in FIG. 3, a fine paper type or polyester film type process paper 5 is directly coated with a gravure direct, a Meyer bar, or a comma coater to a thickness of, for example, 5 μm, and dried to form a fluororesin film 1. . On the dried fluororesin film 1, a vinyl chloride polymer sol mixed with a plasticizer such as polyester or a solution of polyurethane resin is formed to a thickness of, for example, 55 microns by casting film formation such as organosol casting. Then, as shown in FIG. 3, the main film 2 is formed on the fluororesin film 1 by a knife coater or a comma coater.
Further, the pressure-sensitive adhesive layer 3 is obtained by forming, for example, an acrylic pressure-sensitive adhesive with a thickness of 30 μm on a release paper 4 prepared separately, and the pressure-sensitive adhesive surface of the acrylic pressure-sensitive adhesive is polymerized on the main film 2 as shown in FIG. It is formed by performing the transfer.

When the main film 2 is formed by casting on the fluororesin film 1 obtained by applying the fluororesin solution to the process paper 5 and drying, the solvent of the fluororesin film 1 has already evaporated, Therefore, the solvent of the fluororesin does not penetrate into the formed main film 2 and the film of the main film 2 does not need to be overdried, so that there is no shrinkage and blocking when wound as a product. It is possible to obtain a product having a predetermined thickness which is not particularly thin, and particularly a thin product.

Specific examples of the case where the present invention is applied to the production of a marking film are as follows. Example 1 A fluorocarbon resin solution prepared by blending a fluorocarbon resin copolymer and an acrylic resin on a process paper 5 (manufactured by Lintec Co., Ltd.) of a 100-micron polyester film whose surface has been subjected to a release treatment (Novacoat: Dainippon Color Material) Kogyo Co., Ltd.) was applied with a gravure coater to a thickness of 5 microns, and this was applied to 120
It is dried at ℃ for 1 minute to make a fluororesin film 1, on which 100 parts of vinyl chloride polymer and 3 parts of polyester plasticizer are added.
The main film 2 was formed by coating 5 parts of organosol with a comma coater to a thickness of 55 μm and drying at 190 ° C. for 1 minute, and this was wound into a roll.

The film composed of the fluororesin film 1 and the main film 2 on the process paper 5 does not need to be over-dried because the fluororesin film 1 is dried. ,
No shrinkage occurred and no blocking occurred, and the quality was good. This roll was unwound in a separate step to form a pressure-sensitive adhesive layer, and an acrylic pressure-sensitive adhesive applied and dried on the release paper 4 in a thickness of 30 μm was transferred onto the main film to form a pressure-sensitive adhesive layer 3. After that, the process paper 5 was peeled off to obtain a film having a sectional structure shown in FIG. The marking film thus obtained had a total thickness of 90 μm and had good followability to a three-dimensional curved surface when used.

Example 2 A fluorocarbon resin solution (Novacoat: Large) in which a fluorocarbon resin copolymer and an acrylic resin were blended with a process paper 5 (manufactured by Lintec Co., Ltd.) of a 100-micron polyester film whose surface was subjected to a release treatment. Nihon Kyoku Kogyo Co., Ltd. was applied to a thickness of 5 microns with a gravure coater, and this was applied to 120
It is dried at ℃ for 1 minute to make a fluorinated resin film 1, and a solvent-based urethane resin (Resamine: Dainichiseika Co., Ltd.) is coated on it with a comma coater to a thickness of 45 microns.
The film was dried at 00 ° C. for 1 minute to form the main film 2, which was wound into a roll. The polyurethane film having the fluororesin film thus obtained had no shrinkage or blocking, and had good followability to the three-dimensional curved surface when the adhesive film was applied to the marking film.

Comparative Example 1 For comparison with the film of the present invention produced in Example 1 above, 100 parts of vinyl chloride and 35 of a polyester plasticizer were used.
Part of the mixture was formed into a main film by a calender film forming machine to a thickness of 50 μm, and the above-mentioned fluororesin (Novacoat) was used to form a fluororesin film on one side of the main film.
When applied to a film with a thickness of micron and dried to form a film, the solvent of the fluororesin that permeated the main film of vinyl chloride did not completely dry, and the film wound up had the fluororesin film mainly composed of vinyl chloride. When the surface of the film was blocked and the temperature was raised to completely dry the solvent, the main film contracted and the adhesive processing became impossible, which was not suitable for practical use.

Comparative Example 2 Further, for comparison with the film of the present invention produced in Example 1 above, a mixture of 100 parts of vinyl chloride and 35 parts of a polyester-based plasticizer was made to a thickness of 50 μm by a calender film forming machine. A main film was obtained by laminating the film, and a commercially available film of a fluororesin was laminated on the surface of the main film to prepare a film having a fluororesin film. A 50-micron-thick AT-50Y (Kureha Chemical Industry Co., Ltd.) fluororesin film is laminated on one main film, and a 25-micron thick Tedlar (Dupont Co., Ltd.) is formed on the other main film. ) Fluorine resin film is laminated, and another main film is laminated with Fluorine resin film of Aflex (manufactured by Asahi Glass Co., Ltd.) having a thickness of 50 μm. A micron acrylic adhesive was used. The total thickness of these films is 50 to 80 microns thicker than the above-mentioned examples of the present invention and the comparative examples coated with the above-mentioned fluororesin,
The film became too stiff and did not sufficiently follow the three-dimensional curved surface even when the same adhesive processing as in Example 1 was applied.

The films obtained in the above-mentioned examples of the present invention were used as a marking film after being exposed outdoors for 6 months, and then wiped with a dry cloth, whereby the surface stains were completely wiped off. On the other hand, a film consisting of only the main film without the fluorine-based resin film was used as a marking film, and the stains were washed with water after being exposed for the same period, but the stains could not be completely removed.

Further, the marking film of the film obtained in the above-mentioned embodiment of the present invention was used as a sunshine weather meter (manufactured by Suga Test Instruments Co., Ltd., under the condition 120 cycles 18
Minute rainfall, black panel temperature 63 ° ± 3 ° C) 3000
It was exposed for a period of time, and the appearance after the exposure was visually judged. Compared to the marking film without the fluororesin film exposed for the same period, the deterioration of gloss, discoloration, fading and chalking were excellent.

In the above Examples and Comparative Examples, the results of examining shrinkage during lamination processing, residual solvent of the entire film, conformability to a three-dimensional curved surface, and delamination are summarized as follows. Is. Delamination is the natural peelability between laminated resins (fluorine resin film / main film), and thermal shock test (100 ° C and -30 ° C for 5 cycles).
Confirmed in.

[0018]

[0019]

As described above, according to the present invention, since the main film of vinyl chloride or polyurethane is formed on the dried fluororesin film, it can be formed to a predetermined thickness, and it does not shrink and has good quality. There is an effect that a film having a resin film can be obtained at low cost.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the film manufacturing process of the present invention.

FIG. 3 is a partially enlarged cross-sectional view of the film manufacturing process of the present invention.

FIG. 4 is a partially enlarged cross-sectional view of the film manufacturing process of the present invention.

[Explanation of symbols]

 1 Fluorine-based resin film 2 Main film 3 Adhesive layer 4 Release paper 5 Process paper

Claims (2)

[Claims] 1. A fluororesin film characterized in that a fluororesin is coated on a process paper, dried, and subsequently, a main film of vinyl chloride or polyurethane is formed on the fluororesin film by casting. A method for producing a film having: 2. The method for producing a film having a fluororesin film according to claim 1, wherein an adhesive layer is formed on the main film of vinyl chloride or polyurethane after the main film is formed.