JPS6076581A - Adhesive film or sheet for surface protection - Google Patents

Abstract

PURPOSE:The titled film having improved surface protection in squeezing of many times, and workability, obtained by applying a pressure-sensitive adhesive layer to one face of a layer containing an addition agent of a polyolefinic resin film with a multi-layer structure, etc. consisting of a layer containing an addition agent such as colorant, etc. and the layer containing no addition agent. CONSTITUTION:A pressure-sensitive adhesive layer is applied to one face of the layer B of a polyolefinic resin or sheet (preferably thickness is 60mu, one layer is enough as the layer B, and its thickness is preferably 15-30mu) having a multi- layer structure, consisting of (A) a layer containing a colorant such as pigment, dye, etc. and/or ultraviolet light absorber such as phenyl salicylate, etc. as an addition agent, and (B) the layer containing no addition agent, to give the desired film sheet. EFFECT:A product having extremely few flaws and scratches on metal plates, etc. during processing is obtained even without eliminating foreign matters such as dust, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive film or sheet for surface protection, and more specifically, a surface protection effect on thin metal plates such as stainless steel plates, aluminum plates, and steel plates.
The object of the present invention is to provide a surface protection film or sheet that is particularly excellent in surface protection and workability during multiple drawing, roll forming, and bender processing.

Conventionally, the surface insurance of thin-layer plates such as mortar boards has been determined based on the color of the battens, aesthetic appearance, light resistance, weather resistance, etc., and the adjustment of electrical conductivity, coloring agents such as pigments, and ultraviolet absorbers. Adhesive films for surface protection containing additives are known, but after bonding the film to a plate-like object, when performing sheet metal processing such as drawing processing, roll forming processing, and pengu processing,
There were many scratches and dents9, and the same order was used to maintain the quality of the plate-shaped product0.The cause of these problems is due to various additives used in the formulation when manufacturing the product. Since foreign substances such as dust may be included, it is necessary to fully consider the manufacturing conditions and manufacturing method, and the current situation is that a fully satisfactory product has not yet been obtained. Are you working hard to solve problems? As a result of repeated research, we found that by incorporating additives such as colorants and/or ultraviolet absorbers into at least one layer of a multilayer Ir# polyolefin resin film, scratches that occur when processing metal plates, etc. It was discovered that dents were significantly reduced, leading to the present invention.The present invention consists of a layer containing a colorant and/or an ultraviolet absorber as an additive, and a layer not containing the additive. The present invention provides an adhesive tape or sheet for surface protection, characterized in that a pressure-sensitive adhesive layer is provided on one side of a layer containing no additives of a polyolefin resin film or sheet having a multilayer structure.

The adhesive tape or sheet for surface protection of the present invention contains coloring agents such as pigments and dyes, and/or ultraviolet absorbers such as salicylic acid esters such as haphenyl salicylate, benzophenone, and benzotriazole as additives. The above-mentioned polyolefin is blended with a polyolefin-based resin such as the above, and then heated and melted and co-extruded with the above-mentioned polyolefin-based resin containing the above-mentioned additives, or mixed using an organic solvent as a medium, and the above-mentioned polyolefin does not contain the above-mentioned additives. After forming a film separately with a polyolefin resin and laminating them together to form a multilayer horizontal layer, a rubber-based or synthetic resin-based pressure-sensitive adhesive layer is provided on one side of the polyolefin-based resin layer that does not contain additives. It is something that

According to the present invention, a polyolefin resin layer containing additives and a polyolefin resin layer containing additives are laminated, and at least one layer containing no additives is provided, so that temporary Even if the film contains fins, foreign matter, etc., during processing such as multiple drawings and bending, the film deformation stress due to the foreign matter due to the "cushion" effect of the layer that is not impregnated with additives1. The occurrence of scratches, dents, etc. on metal plates etc. is extremely suppressed.

The polyolefin resin layer with a multi-IN structure used in the present invention is said to have a thickness of about 60μ, but it is sufficient to have at least one layer of the polyolefin resin film that does not contain additives, and the fc core film. The thickness should be at least 10 μm or more, preferably in the range of 15 to 30 μm, in order to exhibit the 1 cushion effect. 30p
If the thickness is more than m, the "cushion" effect is sufficient, but the processing workability when used as an adhesive tape for surface reflection may be poor, and there is a risk that the tape may float during processing. be.

As described above, the surface preservation adhesive film of the present invention or -
1. Note L1 Perform operations to remove foreign substances such as dust contained in additives such as colorants and ultraviolet absorbers, and foreign substances that cause fish eyes contained in the raw material polyolefin resin. In addition, it is possible to produce a product with very few scratches or dents on the metal plate even when subjected to processing such as drawing many times. explain.

Examples 1 to 4 A film layer (A layer) containing additives with each composition and thickness shown in Table 1, and a film layer (B layer) containing no additives.
ffl) was coextruded by melt extrusion to produce a two-layer film of polyolefin resin.

A corona pressure adhesive composition was applied to one side of the BE of each of the obtained two-layer films and dried to obtain a surface protection adhesive film.

Comparative Example As shown in Table 1, a film layer containing additives (A
A single layer film of polyolefin resin was produced by extruding only the layer) using a melt extruder, and one side was subjected to corona discharge treatment. The film properties (tensile sag, elongation, haze) of the surface protection adhesive films obtained in each example and comparative example were coated and dried to form one layer of surface protection adhesive film.
The amount of foreign matter and the number of scratches or dents caused by foreign matter after drawing were measured using the following methods, and the results are shown in Table 1.

<Film physical properties> Tensile strength and elongation were determined by cutting each sample into 20-width pieces and measuring 0 according to JISC2336, and haze was determined by JI
The light transmittance was measured according to SK671g, and is the value obtained by subtracting the transmittance from 100%.

<Amount of foreign matter> According to the miscellaneous matter chart of the Printing Bureau of the Ministry of Finance, 0.3 per 1 m
- The number of foreign objects with a size of - or larger was measured.

Number of scratches or dents after processing> 5US30 of normal type 3 with 0.3 thickness at room temperature as shown in Figure 1
The films obtained in each example and comparative example were laminated on a 4BA stainless steel plate 2, and after drawing with a punch 1, each film was separated and the number of scratches or dents caused by foreign objects on the stainless steel plate 2 was counted. It was measured. (Processing conditions: punch diameter 50mm, drawing depth 15mm - inner drawing, wrinkle presser pressure 2
ton, radius of curvature 5R) As is clear from the results in Table 1 and above, by using the surface protection adhesive film or sheet of the present invention, the number of scratches or dents on the metal plate surface after plate kettle processing is significantly reduced. It has been found that it has the ability to

[Brief explanation of drawings]

FIG. 1 is a sectional view of a mold used when the stainless steel plate to which the film is laminated is subjected to a drawing process. 1... Punch, 2... Stainless steel plate, 3... Mold patent applicant Nitto Electric Industry Co., Ltd. Representative Hijikata Sanbu S/Diagram

Claims (1)

[Claims] 1) One side of the additive-free layer of a polyolefin resin film or sheet with a multilayer structure consisting of a layer containing a colorant and/or ultraviolet absorber as an additive and a layer not containing the additive. An adhesive film or sheet for surface protection, comprising: a pressure-sensitive adhesive layer;