JPH06143497A - Multilayered film - Google Patents

Abstract

PURPOSE:To provide a multilayered film in which only a contaminated or damaged surface layer is easily peeled and a new surface layer of the same material can be exposed by producing a laminate of six adhesive resin layers having special adhesive strengths on a base material resin layer. CONSTITUTION:A protective layer film is to be adhered to a surface of a synthetic resin material to be used for a surface material of a floor material, a wall material, a furniture, etc., or interior and exterior materials, etc., of a vehicle. Base material resin layers A, D, an adhesive resin layer B having an adhesive strength with the layer A of 20-350g/25mm width, and adhesive resin layers E, D having adhesive strengths with the layers D of 10-340g/25mm width, and an adhesive resin layer F having adhesive strength with the layers D, B of 500g/25mm width or more are prepared for the film. The layers A-F are sequentially so laminated twice or more from outside in an order of D-F- E-D-C-B-A thereby forming a multilayer film. Further, it is so regulated that the adhesive strength between the layers A and B is stronger by 10g/25mm width or more than that between the layers D and E.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stain-preventing or stain-removing film used as the outermost layer of a packaging or interior / exterior material.

[0002]

2. Description of the Related Art Various synthetic resin materials have been used in place of conventional natural materials as floor materials, wall materials, surface materials such as furniture, and interior / exterior materials of vehicles. Synthetic resins are generally moisture resistant,
Since it has excellent stain resistance and abrasion resistance, it is not easily scratched and dirt can be removed relatively easily with a synthetic detergent, etc., so it is widely used for industrial and general household use. I came. However, during many years of use, the surface layer deteriorates, many scratches are made on the surface, and accumulated dirt cannot be completely removed with synthetic detergent alone, leaving discoloration and yellowing. . Further, when cleaning is performed with an organic solvent, the surface of the synthetic resin may be attacked by the organic solvent. Also, it was used in a narrow place or a high place, and even if it got dirty, it could not be washed normally. In order to solve these problems, a protective layer film is applied on the outer layer material and used, and if the surface is dirty or damaged, the protective layer film can be peeled off so that the main body does not get dirty or scratched. Could be used like. However, the protective layer film does not adhere sufficiently to the main body and peels off during use, or the surface of the main body is damaged when peeled off if it is evenly applied with an adhesive / adhesive. Remained on the surface of the main body, and the original purpose could not be achieved sufficiently. A method of forming a peelable coating film on the surface of the main body by coating was also considered, but the life of the coating film is short, it adheres to unnecessary parts during coating, and it is not always safe because it uses an organic solvent. There was a problem.

[0003]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the conventional protective film or coating as the surface layer of the outer layer material, the present invention peels off the surface layer to obtain a new surface layer for resin adhesion. As a result of researching the adhesiveness and peeling property, it is possible to obtain a post-peelable outer layer material having appropriate adhesive strength and peeling strength by using a hot-melt adhesive layer to form a multilayer film which is previously laminated with a surface layer base film. It has come.

[0004]

According to the present invention, the adhesive strength between the base resin (A) layer, the base resin (D) layer and the A layer is 2 or less.
The adhesive resin (B) layer having a width of 0 to 350 g / 25 mm, the adhesive strength with the D layer of 10 to 340 g / 25 mm, the adhesive resin (E) layer having a width of 500, and the adhesive strength of the D layer and the B layer are both 500.
An adhesive resin (C) layer having a width of g / 25 mm or more, an adhesive resin (F) layer having an adhesive strength with a D layer and an E layer of 500 g / 25 mm or more is D-F-E-D from the outside. −
The layers are laminated in the order of C-B-A, and the adhesive strength between the A layer and the B layer is 10 g / g higher than the adhesive strength between the D layer and the E layer.
It is a multi-layer film having a strength of 25 mm or more.

As the base resin for the A and D layers used in the present invention, polyvinyl chloride resin, polystyrene, polypropylene, high density polyethylene, low density polyethylene, direct compression low density polyethylene, ethylene-α-olefin copolymer Coalesce, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyamide, polycarbonate,
There are saponified ethylene-acetic acid-vinyl copolymers, polyacrylonitrile, polyvinylidene fluoride, polymethylmethacrylate, polymethylethacrylate, polymethylpentene, polyurethane and the like, which are used depending on the application.

As the adhesive resin for the B layer and the E layer, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer partially saponified product, polystyrene, polypropylene, high density polyethylene, low density polyethylene, direct resin low density polyethylene , Ethylene-α-olefin copolymers, ethylene-methacrylic acid copolymers, ethylene-methacrylic acid copolymers, metal cross-linked products and maleic acid graft modified products thereof, or vinyl acetate highly graft-added products, and polyamide elastomers Hydrogenated compounds of styrene-butadiene block copolymers, polyurethane elastomers, isoprene elastomers, and styrene-butadiene-styrene block copolymers may be used alone or in admixture of two or more. The purpose of mixing two or more kinds is to mix a low-adhesion resin or non-adhesive resin and a high-adhesion resin and adjust the adhesive strength before use. Further, in order to stabilize the adhesive strength, an ethylene-vinyl acetate copolymer having a vinyl acetate content of 20% or more and various elastomers can be added as a tackifying component.

The adhesive strength between the D layer and the E layer is 10 g / 25 m
If the width is less than m, peeling easily occurs and peels off before the function as the surface layer is sufficiently fulfilled, which is a problem. Also, the adhesive strength between the A layer and the B layer is 350 g / 25
If it is stronger than the width of mm, it is difficult to make a peeling start point at the time of peeling, the peeling layer is broken, and the A layer, which is the surface to be adhered, has an appearance defect such as skin unevenness, uneven gloss, and whitening. Will end up. In addition, it is practically preferable to have an adhesive strength of 20 to 120 g / 25 mm width if the usage period up to peeling removal is within 6 months, and an adhesive strength of 150 to 350 g / 25 mm width if it is one year or more. Therefore, it is necessary to adjust the strength, and it is not strictly limited.

As the adhesive resin for the C layer and the E layer, low density polyethylene, high density polyethylene, direct low density polyethylene, polypropylene, polystyrene, ethylene-α
-Olefin copolymer, ethylene-vinyl acetate copolymer and other maleic acid graft adducts, vinyl acetate content 20%
There are ethylene-vinyl acetate copolymers, partially saponified ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate-maleic anhydride copolymers, polymethylmethacrylate, modified styrene-butadiene block copolymers, etc. The material is selected and used according to the combination of the base resin (A) layer and the adhesive layer (B) layer. The coextrusion method is most suitable as the method for producing the film of the present invention, and the completely heat-melted resin is laminated inside the sheeting die and adhered under a constant high pressure, so that accurate and stable adhesive strength can be obtained. To be Since the film of the present invention is adhered to the main body, an adhesive /
The adhesive may be applied to the inner layer A and used.

[0009]

[Examples] The resin which was heated and melted was extruded by using seven extruders, introduced into a seven-layer sheeting die, and the films of Examples 1 to 3 were prepared by the coextrusion method. The adhesive strength between the E layers was measured. 25 films
mm-width strip-shaped sample, 200 using autograph
It was performed at a speed of mm / min. The resin used for each layer, the thickness of each layer, and the adhesive strength were as shown in Table 1. PMMA: polymethylmethacrylate (Vicat softening point 115 ° C, specific gravity 1.19) EVOH1: saponified ethylene-vinyl acetate copolymer (melting point 164 ° C, ethylene content 44 mol%) EVOH2: saponified ethylene-vinyl acetate copolymer (melting point 183 ° C., ethylene content 32 mol%) AD1: Maleic acid modified low density polyethylene 75 parts by weight Low density polyethylene 25 parts by weight AD2: Maleic acid modified low density polyethylene AD3: Maleic acid modified low density polyethylene 60 parts by weight Low density polyethylene 40 parts by weight Parts AD4: ethylene-vinyl acetate copolymer (vinyl acetate content 10%) 80 parts by weight ethylene-vinyl acetate copolymer partially saponified product 20 parts by weight AD5: maleic acid-modified ethylene-vinyl acetate copolymer AD6: ethylene-acetic acid Vinyl copolymer (including vinyl acetate 10%) 90 parts by weight Ethylene-vinyl acetate copolymer partially saponified product 10 parts by weight

[0010]

[Table 1]

[0011]

When the multilayer film of the present invention is used as the outer layer material, the surface layer is peeled off after a certain period of use, whereby the contaminated or damaged surface layer can be removed and a new surface layer of the same material can be obtained. It can be used for a long time with various surface conditions. Further, it does not spontaneously peel off during use regardless of the user's intention.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a multilayer film of the present invention.

Claims (2)

[Claims] 1. A base resin (A) layer and a base resin (D)
Layer, adhesive strength with layer A is 20-350 g / 25 mm width adhesive resin (B) layer, adhesive strength with layer D is 10-340
Adhesive resin (E) layer having g / 25 mm width, adhesive strength with adhesive layers (D) and B layer of 500 g / 25 mm width or more, and adhesive strength with D layer and E layer An adhesive resin (F) layer having a width of 500 g / 25 mm or more is laminated from the outside in the order of D-F-D-D-C-B-A, and the adhesive strength between the A layer and the B layer is D. A multilayer film, which is stronger than the adhesive strength between the layer and the E layer by 10 g / 25 mm width or more. 2. The multilayer film according to claim 1, wherein the A layer and the B layer are the same resin.