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Surface protection film

A technology of surface protection film and back layer, applied in the direction of film/sheet adhesive, adhesive type, coating, etc., which can solve problems such as difficulty in peeling off, complicated coating process, and lack of effect , to achieve excellent sliding properties and good reproducibility

Inactive Publication Date: 2014-04-23
TORAY ADVANCED FILM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, these surface protection films are usually rolled into a roll to form a roll, and these rolls have a problem that the films are easily blocked because the base layer and the adhesive layer are pressed together by a strong adhesive force. , when the surface protective film is unrolled during use, it is difficult to perform operations such as peeling off
As such a release treatment, the method of previously applying a release agent to the back layer has been used conventionally. However, it is difficult to achieve a strong bond between the release agent and the back layer and to make it easy to separate from the adhesive layer. Therefore, using A method of undercoating a special release agent, or corona-treating the back layer before applying a release agent
However, there are problems in that the coating process of such release treatment becomes complicated, and the yield decreases and the cost increases.
[0012] In addition, it is also proposed that the back layer is composed of fluorine-based resin or silicon-based resin and polyolefin (Patent Document 7), but sufficient effect cannot be obtained only by using fluorine-based resin or the like. During storage, etc., the adhesive layer and the back layer may easily stick together

Method used

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  • Surface protection film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Adhesive layer resin: A resin composition consisting of a styrene-based elastomer containing 10% by weight of styrene and having an MFR of 10 g / 10 minutes at 230° C. was uniformly mixed with a Henschel mixer. · Butadiene · random copolymer 60% by weight; as an ethylene-α-olefin copolymer, the density is 0.921kg / m 3 And 20% by weight of hexene copolymerized polyethylene (linear low-density polyethylene) with MFR of 5g / 10 minutes at 190°C; and 20% by weight of masterbatch with 40% by weight of hydrogenated terpene phenol as a tackifier .

[0096] Here, as the masterbatch containing 40% by weight of the hydrogenated terpene phenol, a masterbatch of 40% by weight of the hydrogenated terpene phenol and 60% by weight of the above-mentioned hexene-copolymerized polyethylene was used in advance with a twin-screw extruder.

[0097] Back layer resin: 45% by weight of homopolypropylene with an MFR of 5 g / 10 min at 230°C and 24% by weight of propylene-ethylene random copolymer wit...

Embodiment 2、3

[0112] In addition, as the adhesive layer resin of Example 3, a material obtained by uniformly mixing a resin composition composed of a resin composition containing 10% by weight of a styrene component and having an MFR of 10 g / 10 at 230° C. with a Henschel mixer was used. Min styrene·butadiene·random copolymer was 75% by weight, and the tackifier used in Example 2 was 40% by weight and masterbatch 25% by weight. Except for this, the films of Examples 2 and 3 were produced as the same resin configuration as in Example 1.

[0113] In both Examples 2 and 3, in order to cut to a predetermined width, the film was placed on a cutter and rolled into a product roll, and a sample film was obtained smoothly in both cases. Table 1 shows properties of the obtained film.

[0114] (Example 4)

Embodiment 4

[0116] (Example 5)

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Abstract

The present invention provides a surface protection film that has moderate adhesive properties for bonding to adherend bodies with a rough surface, has a rear surface with good slipping properties, and also has blocking resistance and good unwinding properties. The surface protection film according to the present invention has a laminated structure formed at least of an adhesive layer and a back layer, wherein the adhesive layer is formed mainly of a styrene-based elastomer while the back layer is formed mainly of a propylene-based resin containing 0.5 wt% to 10 wt% of a fluorine-containing compound having a polyfluorohydrocarbon group and a polyoxy ethylene group, the back layer having a surface roughness of 3 µm or more in terms of ten-point average roughness (Rz), an initial adhesion strength of 1 N / 25 mm or more to a #320 hair-line-finished SUS 304 plate, and an unwinding force of 0.5 N / 25 mm or less for winding off a film wound up in a roll.

Description

technical field [0001] The present invention relates to a surface protection film used to prevent adhesion of stains or scratches on the surface of an adherend. More specifically, it relates to a surface protection film which is effective even for adherends whose surfaces are rough, such as diffusion plates, diffusion films, or prism sheets used in the field of optics. Appropriate adhesive properties, excellent sliding properties on the back side, and excellent handling properties such as blocking resistance and unwinding properties. Background technique [0002] When processing and transporting synthetic resin sheets, metal sheets, coated steel sheets, and various signs, etc., surface protection films are used to prevent stains from adhering to or scratching the surfaces of these products. [0003] In particular, in recent years, ultra-thin displays such as liquid crystal displays are often used as display devices for personal computers, ultra-thin televisions, and the lik...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/02B32B27/30B32B27/32C09J109/06C09J123/08C09J7/29
CPCC09J2427/006C09J2201/162C08L9/06C09D125/08C09J2423/106C09J7/0275C09J2423/006C09J2453/00C09J7/0221C09J7/0296C09J7/387C09J7/243C09J7/29Y10T428/25Y10T428/2878Y10T428/2848C09J2301/162C08L2666/06G02B1/14
Inventor 长荣克和佐藤淳也今井史朗
Owner TORAY ADVANCED FILM CO LTD
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