JPH07119295B2 - Forming film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used as a base material of a transfer sheet for forming an uneven pattern on the surface of a layer transferred from a transfer sheet, or coated with a resin during the production of a decorative sheet. The present invention relates to a shaping film that is preferably used for the purpose of forming a concave-convex pattern on the surface of a decorative plate by pressing on a surface and then peeling it. More specifically, it is easy to form a concave-convex pattern for shaping by embossing. The present invention relates to a shapeable film.

[Problems to be Solved by Prior Art and Invention]

Conventionally, for example, as a method for forming a concave-convex pattern on the surface of a molded article, a method of molding using a mold having a concave-convex pattern on the inner surface is known, but with a high cost of the mold,
It is not easy to change the pattern, and when injection molding, there is a drawback that thin lines, hairlines, fine uneven patterns etc. are easily damaged by injection pressure, so in recent years the method of forming uneven patterns using a shaping film is generally used. Has been adopted as Examples of the method for forming a concavo-convex pattern with a shaping film include a method for forming a concavo-convex pattern similar to that of the base material on the surface of the layer transferred from the transfer sheet by using the shaping film as the base material of the transfer sheet or A method of pressing the shaping film on the resin-coated surface and then peeling off the shaping film to form an uneven pattern on the surface of the resin-coated surface can be mentioned. As a method for forming a concavo-convex pattern on these shaping films, a concavo-convex pattern is usually formed by an embossing method that is easy to form a concavo-convex pattern and that is easy to synchronize the concavo-convex pattern formed with a printed pattern or the like. . A polypropylene film that is easy to form an embossed pattern as a shaping film for forming an uneven pattern by the conventional embossing method.
Films made of polyethylene, polyvinyl chloride, etc., and polyvinyl chloride / vinylon composite films, etc. are used. However, since these films have poor heat resistance, the embossed shape is deformed or disappears due to the heat during shaping transfer. However, there is a drawback in that the film is easily curled and the work such as printing becomes difficult to perform when it is necessary to perform further printing on the film. Further, there is a problem that such a shaping film having poor heat resistance is unsuitable for so-called in-mold molding in which an uneven pattern is formed on the surface of an injection-molded product by setting the film in a molding die and then injecting it. In order to improve the heat resistance of this type of shaping film, a method of forming a composite with a heat resistant film can be mentioned, but it has a drawback that the cost increases and the film thickness increases.

A shaping film made of a heat-resistant polyester film such as polyethylene terephthalate has been used in place of the film having poor heat resistance, but it is difficult to form a concavo-convex pattern by the embossing method on the polyester film, and therefore, the conventional film is used. Has an uneven pattern formed by methods such as hairline and sandblasting.The uneven pattern formation by these methods is more expensive than the uneven pattern formation by the embossing method, and it is synchronized with the printed pattern like the embossing method. It is difficult to easily form the uneven pattern described above, and there is a drawback that the process becomes complicated and the cost becomes high if the uneven pattern that is in synchronization with the printed pattern is formed.

[Means for Solving the Problems]

The present invention has been made to solve the above problems, and an object thereof is to provide a shaping film which is made of a polyester resin having excellent heat resistance, and which can easily form an uneven pattern by an embossing method. is there.

That is, the present invention comprises (1) a biaxially stretched polyester film having a tensile stress of 2 to 5 kg / mm ² at 100 ° C. elongation of 100%.

(2) The composition of the biaxially stretched polyester film is a polyester which is mainly composed of polyethylene terephthalate and is a copolymer with a different saturated polyester component having a three-dimensional structure capable of forming a non-linear polymer molecule. A film for shaping that is characterized by

(3) A normal polyester film comprising a polyethylene terephthalate resin having a draw ratio of 3 to 5 times.
Alternatively, a shaping film characterized by being composite-laminated with a polyester film having the performance described in (2).

Is the gist.

The shaping film of the present invention comprises a biaxially stretched polyester film having a tensile stress of 2 to 5 kg / mm ² at 100 ° C. and 100% elongation. A method in which different types of saturated polyesters are used as the copolymer is included. Polyethylene terephthalate is preferable as the polyester. The saturated polyester component, the functional group to be polycondensed is not in the same linear direction, for example, polybutylene terephthalate, poly-1,
4-Cyclohexylene dimethylene terephthalate, ethylene terephthalate-isophthalate copolymer, dimethylene terephthalate-isophthalate copolymer and the like are preferable, and these may be one kind or two or more kinds of copolymers. The addition amount of these different esters is preferably 1 to 10% by weight as the content in the polyester resin. Due to the above copolymerization, the polymer becomes non-linear and the crystallinity decreases, which results in a tensile stress of 2% at 100 ° C and 100% elongation.
It can have a performance of ~ 5kg / m ² .

FIG. 1 shows an example in which the shaping film of the present invention is used as a base material of a transfer sheet. In the figure, 1a is the shaping film 1 of the present invention.
The base material 1a is provided with an uneven pattern 2. A release layer 3 is provided on the side of the base material 1a on which the uneven pattern is formed, and a release layer 4 is laminated on this surface. Further, a printed pattern 5 is provided on the surface of the peeling layer 4 at a position in synchronization with the uneven pattern 2 of the substrate 1a (the printed pattern 5 does not need to be entirely in synchronization with the uneven pattern 2, as shown in FIG. As shown, the printed pattern 5 can be provided at a position where there is no uneven pattern 2. The uneven pattern may be provided on the entire surface. Further, an adhesive layer 6 is laminated on the surface thereof to form a transfer sheet 7. The base material 1a is preferably subjected to an easy adhesion treatment and a corona discharge treatment in advance.

The purpose of 1b is to prevent deformation of the film according to claims (1) and (2), to further enhance dimensional stability and strength, and to support in a higher range of transfer and shaping conditions. The auxiliary film provided in 1. is usually a polyester film, and polyethylene terephthalate or the like can be used. The laminating method may be a known method such as coextrusion during film formation or dry lamination using an adhesive. The thickness of the film is preferably 15 to 50 μm for each layer.

The concavo-convex pattern 2 of the base material 1a in the transfer sheet 7 can be formed by an embossing method, and is provided in advance at a position that needs to be synchronized with the printed pattern 5. In order to form the concavo-convex pattern 2 by the embossing method, there is a method of heating and pressing with an ordinary embossing roll, followed by cooling and shaping. The heating and pressing condition with the embossing roll is 140 to 180 ° C.
10 to 60 seconds, preferably a pressure 10 to 100 kg / cm ^2, then 40 to 1
It is preferable to cool at 00 ° C. The release layer 3 is made of a resin that has excellent adhesiveness to the base material 1a and low adhesiveness to the release layer 4. Examples of such resin include melamine resin, epoxy resin, urethane resin, aminoalkyd resin, fibrin resin, and silicone resin. Release layer 4
Can be made of acrylic resin, polyvinyl chloride, polybutyral, fibrin resin, chlorinated rubber, cyclized rubber, polyamide, polyolefin, etc., preferably acrylic resin, polyvinyl chloride. The release layer 4 can be formed by applying the ink made of the above resin by gravure coating, roll coating, silk screen printing or the like to a coating amount of about 1.0 to 10.0 g / m ² .

The printed pattern 5 can be formed by gravure printing, offset printing, silk screen printing, or the like using an ink that uses a resin having a good compatibility with the release layer 4 as a vehicle.

The adhesive layer 6 is made of a resin having good compatibility with the printed pattern 5 and the peeling layer 4, and includes an acrylic resin, a urethane resin, a chlorinated olefin resin, a rubber resin, an epoxy resin, a vinyl chloride-vinyl acetate copolymer resin, A single layer or multiple layers can be formed from vinyl acetate resin, polyamide, ethylene-vinyl acetate copolymer resin, acrylic-styrene copolymer resin, or the like.

As shown in FIG. 2, the transfer sheet 7 is superposed so that the adhesive layer 6 is in contact with the surface of the transferred material 8 and heated from the substrate 1a side, and after the transfer sheet 7 is bonded to the transferred material 8. By peeling the base material 1a, the transfer layer of the transfer sheet 7 is transferred to the surface of the transfer target body 8, and the uneven pattern 2a corresponding to the uneven pattern 2 of the base material 1a is formed on the surface.

The transfer sheet 7 is provided with a metal thin film layer obtained by performing metal vapor deposition or the like instead of the printed pattern, or on the surface of the metal thin film layer, as shown in FIG. A metal thin film pattern formed into a predetermined pattern by etching after forming the layer 9
10 may be formed, or a metal thin film pattern and a printed pattern may be provided at the same time. In FIG. 3, 11 is a pattern layer provided in a desired pattern after forming a metal thin film pattern 10 by etching, 12 is a heat-resistant layer for vapor deposition, and the heat-resistant layer 12 is a urethane-fiber resin or an alkoxysilane resin. ,
It can be formed of an epoxy resin, an aminoalkyd-modified resin, or the like.

FIG. 4 shows another method of using the shaping film 1 of the present invention. In FIG. 4, 13 is a substrate, 14 is a printed pattern, 15 is a resin layer, and after coating the resin forming the resin layer 15, It is possible to form the uneven pattern 2a on the surface of the resin layer 15 by pressing the shaping film 1 against the resin-coated surface before the resin is cured and peeling off the shaping film 1 after the applied resin is cured. it can. When the shaping film 1 of the present invention is used for the above-mentioned applications, it is preferable to perform a release treatment on the surface side of the shaping film 1 which is in contact with the resin layer 11 to provide the release layer 3.
The release layer 3 can be formed of the same resin as the release layer 3 in the transfer sheet.

The shaping film 1 of the present invention is used as a base material of a transfer sheet, and a method of forming an uneven pattern on the surface of a product obtained by performing transfer with the transfer sheet, pressing on a resin-coated surface before the resin is cured. Then, in addition to the method of forming a concavo-convex pattern on the resin layer surface by peeling after curing the resin, a transfer sheet using the shaping film of the present invention or the shaping film of the present invention as a substrate is preliminarily placed in a molding die. It can be used to obtain a product having an uneven surface by various methods such as so-called in-mold molding in which the set product is molded by injection molding or the like and an uneven pattern is formed on the surface of the obtained molded product.

〔Example〕

 Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1 A resin having a copolymer in an amount corresponding to 10 parts by weight of polyethylene isophthalate with respect to 90 parts by weight of polyethylene terephthalate was extruded from an extruder and biaxially stretched to a thickness of 50.
A film of μ was obtained. The surface of this film is released with a silicone release agent to form a release layer with a thickness of 0.5μ, which is then heated with a heat drum at 160 ° C for about 20 seconds and then with a 30μ pitch and a depth of 20μ. It was cooled by pressing with a wire embossing roll (surface temperature 70 ° C). A line pattern similar to that of the embossing roll was formed on the surface of the film.

Using the above film as a substrate, apply acrylic resin (blend of MMA resin and MMA resin introduced with carboxylic acid) to the release layer forming surface so that the coating amount at the time of drying is 2.5 g / m ² and dry. To form a release layer, and then silk screen printing was performed using an ink composed of a mixed resin of acrylic resin and vinyl chloride-vinyl acetate copolymer resin to form a solid pattern. Further, an acrylic-styrene copolymer-based adhesive was applied and dried by silk screen printing so that the coating amount when dried was 2.5 g / m ² , to form an adhesive layer, which was used as a transfer sheet.

This transfer sheet was set in an injection molding mold so that the adhesive layer side was in contact with the injection resin, the resin was injected, and after cooling, it was taken out of the mold and the base material of the transfer sheet was peeled off. A fine parallel line pattern similar to that of the material was formed, and it was possible to form a fine uneven pattern on the surface of the molded product that could not be obtained by the method of directly making an uneven surface on the inner surface of the mold.

Example 2 A resin having a copolymer in an amount corresponding to 90 parts by weight of polyethylene terephthalate and 10 parts by weight of polyethylene terephthalate was extruded from an extruder and biaxially stretched to a thickness of 25.
A film of μ was obtained. After forming a release layer similar to that in Example 1 on this film, line embossing was formed in a logo pattern in the same manner as in Example 1 to obtain a shaping film, and Example 1 was formed on the surface of this film. After forming a release layer similar to that described above, a pattern pattern synchronized with the logo pattern is formed on the surface of the release layer by the same ink as in Example 1 by silk screen printing, and an adhesive similar to that in Example 1 is further formed thereon. The layers were formed into a transfer sheet.

When this transfer sheet was injection-molded in the same manner as in Example 1, an injection-molded product in which a hairline-like uneven pattern was synchronized with the logo pattern was obtained.

Example 3 A resin having a copolymer in an amount corresponding to 10 parts by weight of polyethylene isophthalate with respect to 90 parts by weight of polyethylene retephthalate was extruded from an extruder and biaxially stretched to have a thickness.
A 16 μ film was prepared, and this and a normal polyethylene terephthalate film were dry laminated through a urethane adhesive to obtain a laminated film. After providing a release layer similar to that of Example 1 on this film, an embossed pattern having the same logo pattern as that of Example 2 is formed to form a shaping film, and a vapor deposition heat-resistant film made of a urethane fiber-based resin is formed on this surface. The layer was formed by coating the entire surface to a thickness of 1 μm, and further, an aluminum vapor deposition layer having a thickness of 400 Å was formed thereon.
Next, the aluminum vapor-deposited layer surface is printed with an etching resist ink made of urethane fiber-based resin in synchronization with the logo pattern portion, and then etched with an alkaline aqueous solution to form a printed pattern in synchronization with the logo pattern by the etching resist ink. The vapor deposition layer in the non-existing portion was removed to form a logo-patterned metal pattern with embossing. After printing was further performed in synchronization with the metal pattern, the same adhesive layer as in Example 1 was formed to obtain a transfer sheet. Using this transfer sheet, injection molding was carried out in the same manner as in Example 1 to obtain an injection molded product having a loco-patterned metal pattern having an embossed shape.

Example 4 The surface of the shaped film of the laminated polyester film obtained in the same manner as in Example 3 was subjected to silicone release treatment at a thickness of 0.5 μm in the same manner as in Example 1 and then the same embossing plate was used. A shaping process was performed under similar processing conditions.

On the other hand, a thin paper of 23 g / m ^{2 and} a gravure ink for thin paper made of nitrocellulose / alkyd resin were used to adhere a patterned printing paper to a plywood with a vinyl acetate adhesive. An unsaturated polyester resin (Polylite CH304 manufactured by Dainippon Ink and Chemicals, Inc.) containing 1.5% of methyl ethyl ketone peroxide as an initiator was applied to the printed surface.
The embossed surface of the above embossed film was laminated on this and deaerated with a roller. When the shaping film was peeled off after the resin was cured, a decorative material having a concavo-convex pattern of a logo pattern on the surface was obtained.

〔The invention's effect〕

As described above, the shaping film of the present invention is obtained by blending polyester with a thermoplastic resin and biaxially stretching it.
Since the tensile stress at 100 ° C. and 100% elongation is set to 2 to 5 kg / mm ² , it is possible to easily form the uneven pattern by the embossing method, so that it is easy to form the uneven pattern.
It is easy to form an uneven pattern in synchronization with a printed pattern, and there is no risk that the formed uneven pattern will collapse or the film will curl when forming the uneven pattern. Furthermore, since the shaping film of the present invention is made of highly heat-resistant polyester, it can be used at high temperatures such as in-mold molding, and can be used when forming an uneven pattern on the product surface by various methods. It is possible.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a transfer sheet using the shaping film of the present invention as a substrate, and FIG. 2 is a vertical cross-sectional view showing a transfer method having an uneven pattern using the transfer sheet of FIG. ,
FIG. 3 is a vertical sectional view showing a different aspect of the transfer sheet, and FIG.
The figure is a longitudinal sectional view showing another method of using the shaping film of the present invention. 1 ... Shaping film

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Claims (3)

[Claims] 1. A biaxially stretched polyester film having a tensile stress of 2 to 5 kg / mm ² at 100 ° C. and 100% elongation.
A film for shaping, which comprises: 2. A heterogeneous saturated polyester having a three-dimensional structure in which the composition of a biaxially stretched polyester film is mainly composed of polyethylene terephthalate and has a three-dimensional structure capable of forming a non-linear polymer molecule in order to reduce the crystallinity. A film for shaping, which is a polyester that is a copolymer with the components. 3. An imprinting characterized in that a normal polyester film made of a polyethylene terephthalate resin having a draw ratio of 3 to 5 times is composite-laminated with the polyester film having the performance according to claim (1) or (2). the film.