JPH045036A - Composite film on which supporting film is adhered temporarily - Google Patents

Abstract

PURPOSE:To prevent a PVC film from occurrence of shrinkage and deformation while it is treated by coating or other treatment by temporarily adhering one face of polyvinyl chloride resin (PVC) film with a supporting film having heat resistance and dimensional stability such that it can be peeled off. CONSTITUTION:A PVC film and a supporting film are temporarily adhered together by heat adhesion under a proper heating and pressing condition to improve resistance to heating and tension and to obtain a treated film with small dimensional change even if the composite film is treated by printing, coating or in some cases, coating with a foamed layer. After the PVC film is treated, a PVC film with no dimensional change can be obtd. by peeling off the supporting film. The resin which can be used as the supporting film are such a resin that has heat resistance, solvent resistance and dimensional stability and can be adhered temporarily with and easily peeled off from a polyvinyl chloride and the most pref. one is a polyester resin and especially pref. is a polyester resin consisting of terephthalic acid or isophthalic acid and ethylene glycol.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a polyvinyl chloride resin composite film (hereinafter referred to as
More particularly, the present invention relates to a composite film for maintaining dimensional stability when PVC films used in various applications are printed, coated or heat treated. It is something.

[Conventional technology and issues]

PVC film is popular due to its excellent performance properties, such as ease of processing, flexibility, colorability, printability, adhesion to other substrates, flame retardancy, and relatively low cost. is the most widely used general-purpose resin. However, due to its flexibility and low heat resistance, PVC film exhibits significantly poor dimensional stability when exposed to high temperatures, tension, and solvent penetration during various processing steps. However, the range of processing conditions was narrow and the processing methods were also limited.

In order to solve this problem, conventionally, PVC film was replaced with other materials with good heat resistance and solvent resistance, such as polyester resin, fluorine resin films, paper, fibrous materials such as nonwoven fabric, iron, aluminum, etc. A composite film made of metal foil, etc. is used.

However, these conventional composite films are made of PVC
This significantly impedes the film's inherent flexibility, adhesiveness, processability, such as vacuum formability, and makes it impossible to use the pvC film for its intended purpose. Moreover, as a result of compounding, the price also increases, which tends to limit the applications.

[Means to solve the problem]

The inventors of the present invention have conducted extensive research to solve this problem, and have discovered that the above problem can be solved by attaching a support film to a PVC film in a releasable manner.

That is, the present invention aims to solve the above problems by providing a composite film in which a support film with excellent heat resistance and dimensional stability is temporarily attached to one side of a PVC film in a removable manner.

The present invention will be explained in more detail below.

PVC film has excellent processability, flexibility, colorability, printability, adhesion to other substrates, flame retardancy, etc.
The film may be vacuum formed, pressure formed, or laminated to other substrates, but prior to this, the film may be printed, coated, or laminated with other films and painted. It often goes through At this time, high temperatures, high tensions, and in some cases, penetration of solvents inevitably occur, causing stretching, shrinkage, or deformation of the film, making it difficult to maintain the desired dimensions.

Therefore, in the present invention, the PVC film and the supporting film are temporarily bonded by thermal adhesion under appropriate heating and pressure conditions to increase resistance to heating and tension.
Even if this composite film is subjected to treatments such as printing, coating, and in some cases covering with a foam layer, it is possible to obtain a treated film with little dimensional change. If the supporting film is peeled off after the PvC film is processed as described above, a PvC film that undergoes printing, foaming, or other treatments can be obtained with no or very little dimensional change. It's coming.

The treated film obtained in this way can be used as a single PVC film for post-processing using normal methods, such as cabinet woodworking, coating on steel plates, and other applications for which PVC films have traditionally been used. can.

The PVC film used in the present invention can be used with or without a plasticizer added, and the range is about 0 to 100 phr.

The thickness of the PVC film is not particularly limited, but is usually about 20 to 500 microns, preferably about 50 to 200 microns.

The resin that can be used as the support film can be of any type, as long as it has its own heat resistance, solvent resistance, and dimensional stability, can be temporarily attached to polyvinyl chloride, and can be easily peeled off.For example, polyester Although resins such as , polyamide, and polycarbonate can be used, the most preferred is a polyester resin, and particularly preferred is a polyester resin made of terephthalic acid or isophthalic acid and ethylene glycol (hereinafter referred to as PET film).

The thickness of the support film depends on the thickness of the PVC film to be composited, but is usually about 10 to 150 μl, more preferably 12 to 75 μl, and typically about 12 to 50 μl.

The temporary attachment of the PVC film and the support film may be done by any combination method that allows the PVC film to adhere to the extent that it does not peel off during processing and is easily peeled off after processing. The most preferred method is a method using a hot plate.

That is, by overlapping the PVC film and the support film and pressing them under heat, they can be easily temporarily attached. Specifically, for example, temporary pasting can be performed by continuously passing between a heated mirror drum and a pressure roller. The pressure bonding temperature is P as the support film.
When using ET film, the temperature is preferably about 140°C.

Below, the present invention will be explained in more detail with reference to Examples.

1 (hot plate pasted) PVC film (manufactured by Riken Vinyl Industries Co., Ltd., thickness 100
μ! , width: 100 cz, plasticizer addition: 20 phr) and PET film (manufactured by Unitika Co., Ltd., thickness 25 μz)
are stacked and passed between a metal roll and a rubber roll heated to 140°C with a spacing of 0 and 1 zz).
A hot plated composite film was formed (see Figure 1). The peel strength of this temporary film is 5 g/inch (2,54 c
i+).

(Coating, heating test) The composite film obtained as described above was wet coated with a solvent-based paint (solid content 20%, toluene + MEK = 3:2) to a thickness of 150 μm, as shown in Table 1. The shrinkage of the film in the width direction was measured after passing through a drying oven set at the temperatures shown for 5 minutes (see Figure 2).

For comparison, the results of the same treatment on a PVC film alone were also measured. These results are shown in Table 1.

Table-1 As can be seen from Table 1, the composite film of the present invention is
Width shrinkage could be significantly reduced compared to PVC film alone.

(Peeling of support film) When the composite film coated and dried as described above was continuously rewound using a rewinding machine equipped with a biaxial winding device, the PVC film and PET
The film was easily peeled off without any damage or stretching to the PVC film (see Figure 3).

(Application to plywood) The treated PVC film obtained as described above was applied to plywood for building materials (Starwood) using a general-purpose PVC laminated plywood adhesive (ethylene-vinyl acetate copolymer manufactured by Chuo Rika Co., Ltd.). When laminated using a PVC film (emulsion type), it showed the same adhesive strength as conventional PVC film for PVC plywood.

Azobisisobutyronitrile was added as a foaming agent to the paint used in Example 1 at a concentration of 1% by weight, and wet coating was performed to a thickness of 100 μl. When this was passed through a drying oven at 140℃, 250 μl
A PVC composite film with a thick foam layer was obtained. The shrinkage per 100 c1 of width after cooling was 1811.

On the other hand, when the PVC film was used alone, it broke in the drying oven, and a satisfactory product could not be obtained.

〔Effect of the invention〕

In the present invention, since the support film is temporarily attached to the PVC film as described above, the PVC film does not shrink or deform while coating or other treatments are applied to the PVC, and the support film is not attached after the treatment. By peeling it off, it can be used as the original PVC alone. Therefore, processing such as printing, coating, and foaming can be freely performed without worrying about shrinkage of the PVC film, and the range of uses can be expanded.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a PET film pasted onto a PVC film on a hot plate. FIG. 2 shows a coating applied to a PVC film. FIG. 3 is a diagram showing the PET film peeled off. 1: PVc film 2: PET film 3 Coating patent applicant Riken Vinyl Industries Co., Ltd.

Claims (1)

[Claims] A composite film in which a heat-resistant and dimensionally stable support film is temporarily attached to one side of a polyvinyl chloride resin film in a removable manner.