JPH0820199A - Film having mold releasability for transfer foil - Google Patents

Abstract

PURPOSE:To provide a molding in which peeling property from a decorative layer is excellent by forming a mold release layer consisting of a resin such as a water-soluble polyester and polyvinyl alcohol through a primer layer on one side of a vinyl chloride-based resin layer consisting of vinyl chloride resin containing a plasticizer in a specified amount. CONSTITUTION:A film 1 having mold releasability is suitable for a transfer foil 7 being capable of transferring a decorative layer 5 on the three- dimensionally curved surface of a three-dimensional molding together with injection molding. The film 1 has a vinyl chloride-based resin layer (base film) 2 which consists of vinyl chloride resin containing a plasticizer of 0-40 pts.wt. and having average degree of polymerization of at most 1500 and has a thickness of 10-500mum. A mold release layer 4 is formed on one side of the base film 2 through a primer layer 3. The mold release layer 4 consists of a copolymer resin of a water-soluble polyester, polyvinyl alcohol and an ethylene vinyl alcohol and has a thickness of 0-5-50mum. A urethane resin obtained by cross- linking a polyol and an isocyanate and having a thickness of 0.1-30mum is used for the primer layer 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a releasable film for transfer foil, and more specifically, a release film for transfer foil capable of transferring a decorative layer onto a three-dimensional curved surface of a three-dimensional molded product simultaneously with injection molding. The present invention relates to a moldable film.

[0002]

2. Description of the Related Art Conventionally, a transfer foil provided with a decorative layer having characteristics such as a pattern, scratch resistance and antistatic property on a base film having releasability is provided on the inner surface of a cavity of an injection molding die. After mounting and closing the mold, injection molding is performed, and by peeling and removing the release film after molding,
Various properties are given to the surface of a molded product. These releasable substrate films for transfer foils need to easily follow the inner shape of the mold cavity during injection molding, and polyethylene terephthalate films are generally used in many cases. Since the decorative layer is provided on the polyethylene terephthalate film, a wax such as silicone is also added to the releasable base film in order to improve the releasability from the decorative layer. However, polyethylene terephthalate film has a high heat distortion temperature, and is not sufficiently plasticized by the mold temperature during normal injection molding or instantaneous heating. I can't. As a result, there is a problem that wrinkles occur during resin injection molding and wrinkles occur in the molded product after release.

Further, it has been considered to use a polyvinyl chloride resin film as a releasable substrate film capable of following the deep drawing shape of this molded product. Although the wrinkle at the time of molding is improved with the foil, the peelability between the base material and the decorative layer is poor, and the decorative layer cannot be transferred to the molded product. As this improvement, wax such as silicone was added to the polyvinyl chloride resin film to improve the releasability, but there is a problem that the added wax adheres to the surface of the molded product and impairs the appearance. It was poor.

[0004]

In order to solve the above problems, the present invention favorably follows the deep drawing shape of a molded product,
Another object of the present invention is to provide a releasable film for transfer foil, which has excellent releasability from the decorative layer.

[0005]

Means for Solving the Problems That is, the gist of the present invention is to provide a vinyl chloride resin layer having a thickness of 10 to 500 μm and comprising a vinyl chloride resin containing 0 to 40 parts by weight of a plasticizer and having an average polymerization degree of 1500 or less. In addition, a resin having a thickness of 0.5 to 50 μm, which is made of a resin selected from water-soluble polyester, polyvinyl alcohol, ethylene vinyl alcohol copolymer resin, UV-curable acrylic resin or UV-curable silicone resin, is separated via a primer layer. A releasable film for a transfer foil, comprising a mold layer.
Hereinafter, the present invention will be described in detail.

The vinyl chloride resin used in the vinyl chloride resin layer of the present invention includes, in addition to polyvinyl chloride, a copolymer mainly composed of vinyl chloride with a comonomer, a mixture thereof, or a copolymer thereof. It is also possible to use mixtures with polymers or copolymers. The degree of polymerization of this vinyl chloride resin is 1500 or less, preferably 500 or more and 1500 or less. When it is higher than 1500, the film does not sufficiently follow the shape of the mold in the deep-drawn portion of the molded product, which is not preferable.

The plasticizer to be blended with the vinyl chloride resin may be any plasticizer commonly used for plasticizing vinyl chloride resins, for example, a phthalate ester plasticizer or an isophthalate ester plasticizer. , Fatty acid ester plasticizers, trimellitic acid ester plasticizers, polyester plasticizers, organic phosphate ester plasticizers, epoxy resin plasticizers and the like. The blending amount of these plasticizers is
It is 0 to 40 parts by weight, and particularly preferably 0 to 20 parts by weight, relative to 100 parts by weight of the vinyl chloride resin. When it is 40 parts by weight or more, it is not preferable because it is excessively softened at the time of injection molding and easily wrinkles, and when the decorative layer includes a pattern, the pattern is partially extended.

The thickness of the film is in the range of 10 to 500 μm, particularly preferably 50 to 200 μm. If the film thickness is 10 μm or less, it is not preferable because it may be broken or wrinkled by the molten resin injected at the time of molding, and if it is 500 μm or more, it does not sufficiently follow the mold shape of the molded product details and also increases the cost. Therefore, it is not preferable.

In the present invention, various resin additives which are usually blended with the plasticizer, such as heat stabilizers, lubricants, dyes, etc., may be blended, and these additives are vinyl chloride resin 100.
It can be used in an amount of 10 parts by weight or less based on parts by weight. To mix the plasticizer and various resin additives into the vinyl chloride resin, use a ribbon blender, a Banbury mixer, a super mixer, or other conventionally known mixers, and form the resulting resin mixture into a film. For this purpose, known techniques such as an extrusion molding method such as a T-die method and an inflation method, a calender molding method, and a casting method can be used.

In the present invention, the primer layer adheres the release layer and the vinyl chloride resin layer to prevent the release layer from peeling from the vinyl chloride resin layer. The resin that forms the primer layer is a resin that exhibits adhesion to both the release layer and the vinyl chloride resin layer, and may be a crosslinkable adhesive resin that does not melt due to heat during molding. Specific examples thereof include urethane resin, acrylic resin, chlorinated polyethylene, and the like, and particularly preferable is urethane type resin composed of polyol such as polyester polyol and polyether polyol and isocyanate. The thickness of the primer layer is
0.1-30 to maintain sufficient adhesiveness and transfer foil moldability
μm is preferable, and particularly preferably in the range of 1 to 10 μm. When the thickness of the primer layer is 0.1 μm or less, the adhesive strength between the release layer and the vinyl chloride resin layer is poor, which is not preferable, and when the thickness is 30 μm or more, it does not sufficiently follow the mold shape at the time of molding, and the primer layer It is not preferable because it causes cracks.

The release layer is a resin that does not have adhesion to the resin forming the decorative layer, and is required to have a hardness that does not cause wrinkles or cracks by following the deformation of the vinyl chloride resin film as the base material. And a resin selected from water-soluble polyester, polyvinyl alcohol, ethylene vinyl alcohol copolymer resin, UV-curable acrylic resin, and UV-curable silicone resin. The thickness of the release layer is 0.5-50μ
The range of m is preferable, and the range of 1 to 10 μm is particularly preferable. When the thickness of the release layer is 0.5 μm or less, the releasability from the decorative layer is poor and the decorative layer cannot be formed on the surface of the molded product. When the thickness is 50 μm or more, the shape of the mold cannot be sufficiently followed during molding, and wrinkles are formed on the decorative surface of the molded product, which is not preferable.

The primer layer and the release layer may be formed by laminating each as a film or by coating as a coating liquid. In the case of a coating liquid, each resin to be used is dissolved or dispersed in an organic solvent or water, and an ordinary coating method, for example,
It may be formed by a roll coating method such as gravure roll or reverse roll coating, or a coating method such as die coating or flow coating. The coating film may be dried by a commonly used hot air drying method, and the drying conditions are a temperature of 80 ° C. to 150 ° C. and a time of 0.5 minutes to
3 minutes.

The release film for transfer foil of the present invention is usually used as a transfer foil in which a decorative layer having characteristics such as a pattern, scratch resistance and antistatic property is provided on the release layer. After the transfer foil is brought into close contact with the inner surface of the cavity of the injection molding die, injection molding is performed and the release film is removed, whereby a molded product having various characteristics can be manufactured.

[0014]

EXAMPLES The present invention will be described in detail below based on examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Example 1 On one side of a polyvinyl chloride film having a thickness of 200 μm, which comprises a vinyl chloride resin having an average degree of polymerization of 800 and 20 parts by weight of dioctyl phthalate, a urethane adhesive (main agent: Adcoat AD-335A, curing agent (AT-10, Toyo Morton Co., Ltd.) was coated with a reverse roll coater to a thickness of 1 μm to form a primer layer, and an ethylene vinyl alcohol copolymer resin (Soarnol 16D, manufactured by Nippon Synthetic Chemical Co., Ltd.) was used as a release layer on the primer layer. Was coated to a thickness of 3 μm with a reverse roll coater to obtain a base film for transfer foil.

On the release layer of the obtained base film, polymethacryl resin (produced by Delpet Asahi Kasei Co., Ltd.) is provided with colloidal silica (IPA-) for imparting abrasion resistance.
A decorative layer formed by adding ST and Nissan Chemical Co., Ltd. was coated with a reverse roll coater to a thickness of 3 μm to obtain a transfer foil. The obtained transfer foil was mounted inside an injection molding die, and a polycarbonate resin (Novarex, manufactured by Mitsubishi Kasei Co., Ltd.) was melt-injected and transferred to a molded product simultaneously with injection molding. The flexible film was easily released from the surface of the molded product, and a good appearance was obtained without the occurrence of wrinkles or cracks in the decorative layer.

Example 2 A water-soluble polyester (WR-90) having a thickness of 2 μm was used as a release layer.
7 A transfer foil was manufactured in the same manner as in Example 1 except that it was manufactured by Nippon Synthetic Chemical Industry Co., Ltd. When the obtained transfer foil was transferred simultaneously with injection molding in the same manner as in Example 1, the release film was easily released from the surface of the molded product, and wrinkles and cracks on the surface of the decorative layer were also generated. And a good appearance was obtained.

Example 3 A conductive coating (ELECOM P3030 Catalysts & Chemicals Co., Ltd.) was formed on the release film for transfer foil produced in Example 1.
Was formed on the decorative layer, and an acrylic resin (manufactured by Delpet Asahi Kasei Co., Ltd.) as an adhesive was formed on the decorative layer with a reverse roll coater to a thickness of 2 μm to obtain a transfer foil. When the obtained transfer foil was transferred simultaneously with injection molding in the same manner as in Example 1, the release film was easily released from the surface of the molded product, and wrinkles and cracks on the surface of the decorative layer were also generated. And a good appearance was obtained.

Example 4 A UV-curable urethane acrylate resin coating (KRM7033 Daicel-VCB) having a thickness of 10 μm was used as the release layer, and ultraviolet rays (high-pressure mercury lamp Eyegraphic Co., Ltd.) were used.
(Production) A transfer foil was produced in the same manner as in Example 1 except that it was cured. When the obtained transfer foil was transferred simultaneously with injection molding in the same manner as in Example 1, the release film was easily released from the surface of the molded product, and wrinkles and cracks on the surface of the decorative layer were also generated. And a good appearance was obtained.

Example 5 An ultraviolet curable silicone resin (KNS-5300, X-62-7052 manufactured by Shin-Etsu Silicone Co., Ltd.) having a thickness of 10 μm was used as a release layer, and ultraviolet rays (manufactured by High Pressure Mercury Lamp Eyegraphic Co., Ltd.) were used. A transfer foil was produced in the same manner as in Example 1 except that the transfer foil was cured in step 1. When the obtained transfer foil was transferred simultaneously with injection molding in the same manner as in Example 1, the release film was easily released from the surface of the molded product, and wrinkles and cracks on the surface of the decorative layer were also generated. And a good appearance was obtained.

Comparative Example 1 A vinyl chloride resin layer comprising a vinyl chloride resin having an average degree of polymerization of 1700 and 50 parts by weight of dioctyl phthalate and having a thickness of 2
Example 1 except using a polyvinyl chloride film of 00 μm
A transfer foil was manufactured in the same manner as in. The obtained transfer foil was used in Example 1.
When transfer was performed at the same time as injection molding in the same way as
Although the release film was released from the surface of the molded product, significant wrinkles were observed on the surface of the decorative layer, and the appearance of the molded product was poor.

Comparative Example 2 A transfer foil was produced in the same manner as in Example 1 except that the release layer was made of a 0.5 μm thick silicone type release agent (manufactured by Shin-Etsu Silicone Co., Ltd.). When the obtained transfer foil was transferred simultaneously with injection molding in the same manner as in Example 1, the release film was well released from the surface of the molded product, but the release layer adhered to the surface of the decorative layer. , The appearance of the molded product was inferior.

[0022]

INDUSTRIAL APPLICABILITY The release film for transfer foil of the present invention, when used for a transfer foil by simultaneous injection molding transfer, can follow the deep-drawing shape of a molded article well and can be formed into a shape after molding. Since the transfer foil is also excellent in releasability, a molded product having a decorative layer with a good appearance can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a release film for transfer foil of the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of a transfer foil using the release film for transfer foil of the present invention.

[Explanation of symbols]

 1 Release Film for Transfer Foil 2 Base Film 3 Primer Layer 4 Release Layer 5 Decorative Layer 6 Adhesive Layer 7 Transfer Foil

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B32B 27/22 8413-4F 27/28 102 8413-4F 27/30 101 8413-4F 102 8413-4F 27/40 8413-4F // B29C 45/16 8823-4F

Claims (3)

[Claims] 1. Thickness of 10 consisting of a vinyl chloride resin containing 0 to 40 parts by weight of a plasticizer and having an average degree of polymerization of 1500 or less.
A resin selected from water-soluble polyester, polyvinyl alcohol, ethylene vinyl alcohol copolymer resin, UV-curable acrylic resin, or UV-curable silicone resin with a primer layer on one side of a vinyl chloride resin layer of 500 μm A release film for transfer foil, comprising a release layer having a thickness of 0.5 to 50 μm. 2. The release film for a transfer foil according to claim 1, wherein the primer layer is a urethane resin having a thickness of 0.1 to 30 μm formed by crosslinking a polyol and an isocyanate. 3. The release film for transfer foil according to claim 1, which contains 0 to 20 parts by weight of a plasticizer.