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Surface protective film

A surface protective film and back layer technology, applied in protective clothing, protective equipment, film/sheet adhesives, etc., can solve the problems of poor cushioning properties, hard substrate layer, and inability to completely eliminate fish eyes, etc. good reproducibility

Active Publication Date: 2012-12-26
TORAY ADVANCED FILM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Furthermore, in the state where the protective film is attached to the adherend, punching or drawing processing, cutting or grinding processing are performed, and as the improvement of the secondary processability, various proposals have been proposed, but each has its own advantages and disadvantages. Short and long, there is no solution that satisfies multiple interleaving characteristics at the same time, and the inventors have proposed a solution that satisfies the multiple interleaving characteristics at the same time (Patent Document 5)
[0008] In addition, recently, in order to eliminate pits and the like (marks) on the adherend caused by protrusion defects such as fish eyes, which are increasingly required, it has been proposed to use a polyethylene-based resin in the base layer (Patent Document 6 ) or a solution using polypropylene-based resin (Patent Document 7), however, it has not yet reached a level that sufficiently satisfies the elimination of scratches on adherends caused by tiny fish eyes, etc.
[0009] That is, in Patent Document 6, although it is proposed to use low-density polyethylene or the like in the base material layer, the fisheye itself cannot be completely eliminated. Relatively soft polyethylene-based resin, when the surface protection film and the adherend are attached together and stored as a roll for a long period of time, swelling (convexity) caused by the fish eyes of the surface protection film will occur. Stress concentration, so that the bulging causes pitting defects on the adherend, and it is still difficult to completely eliminate the scratches caused by fish eyes, etc. on the adherend
In addition, Patent Document 7 proposes to use a polypropylene resin in the base layer to reduce the number of fish eyes. The material layer is hard, the cushioning properties are poor, and fisheye defects exist on the contrary, and the scratches on the adherend tend to become more serious than when polyethylene resin is used
[0010] It should be noted that, according to the proposal of the inventors of the present invention (Patent Document 5), the required high quality without causing craters or deformation on the adherend due to defects such as minute fish eyes or wrinkles is applicable to all Optical film is not fully satisfied

Method used

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  • Surface protective film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The constituent resins of the respective layers were prepared as follows.

[0088] As the adhesive layer resin, the density is 0.922g / cm containing 1000ppm phosphorus antioxidant 3 , An ethylene-1-hexene copolymer (straight continuous low-density polyethylene) with a melting point of 116°C and an MFR of 5.0 g / 10 minutes at 190°C is used as an intermediate layer resin with a density of 0.923 g / cm 3 , a resin composition composed of 91% by weight of high-pressure low-density polyethylene with an MFR of 10 g / 10 minutes at 190° C., 6.6% by weight of an adhesive layer resin, and 2.4% by weight of a backside layer constituent resin composition described later (assuming The composition of the recovered side) was uniformly mixed by a Henschel mixer. As the back layer resin, an ethylene-propylene random copolymer with an MFR of 35 g / 10 minutes at 230° C. and an ethylene content of 5% by weight was used. MFR is 2 g / 10 min at 80% by weight and 190°C, density is 0.92 g / cm 3 A res...

Embodiment 2

[0100] The constituent resins of each layer were prepared as follows.

[0101] As the adhesive layer resin, the density is 0.922g / cm containing 1000ppm phosphorus antioxidant 3 , a melting point of 116°C, a MFR of 5.0 g / 10 minutes at 190°C, 40% by weight of ethylene-1-hexene copolymer (straight low-density polyethylene) and 1200ppm of phenolic antioxidants with a density of 0.875, a melting point It is a resin composition composed of 60% by weight of ultra-low density polyethylene with an MFR of 3.0 g / 10 minutes at 71°C and 190°C, which is uniformly mixed by a Henschel mixer, and used as an intermediate layer resin with a density of 0.923g / cm 3 , Low-density polyethylene with an MFR of 10 g / 10 min at 190°C is used as the back layer resin, with an MFR of 7.5 g / 10 min at 230°C and a density of 0.90 g / cm 3 Homopolypropylene 45% by weight, MFR at 230°C is 35 g / 10 minutes, ethylene-propylene random copolymer with ethylene content of 5% by weight 45% by weight and MFR at 190°C is...

Embodiment 3

[0108] Used as an adhesive layer resin with a density of 0.93g / cm 3 , MFR at 190°C is 7 g / 10 minutes, and 60% by weight of ethylene·methyl methacrylate copolymer of 10% by weight of MMA and 40% by weight of ethylene·1-hexene copolymer of Example 1 are used instead The ethylene-1-hexene copolymer (straight low-density polyethylene) of Example 1 was 100% by weight, and the same ethylene-methyl methacrylate copolymer as that used for the above-mentioned adhesive layer was used as the intermediate layer resin, Except for this, it carried out similarly to Example 1, produced the 3-layer laminated film of film thickness 35 micrometers, and wound up once in roll shape.

[0109] Next, the film wound into a roll was installed in a slitter, and processed into a size of 1600 mm in width and 7,000 m in length to obtain a film sample wound into a roll.

[0110] In addition, the film unwinding property of a roll sample was easy to unwind without especially applying tension|tensile_strength...

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Abstract

Provided is a surface protective film with which there is no increase in adhesive force with respect to an optical film requiring high quality, no contamination of an adherend, and no scratch defects such as depressions or deformations in the adherend. The protective film is formed from a three-layer laminate of an adhesive layer, a back surface layer, and a middle layer. The adhesive layer is formed from an ethylene / a-olefin copolymer, an ethylene / methyl methacrylate copolymer, or a mixture thereof. The middle layer is formed from primarily a polyethylene resin having a density of 0.870 to 0.935 g / cm3, an ethylene / methyl methacrylate copolymer, or a mixture thereof. The back surface layer is formed from polypropylene resin and low-density polyethylene. The surface roughness of the back surface layer is 0.6 [mu]m or greater in terms of a calculated average roughness (Ra), and 4 [mu]m or greater in terms of a ten-point average roughness (Rz).

Description

technical field [0001] The present invention relates to a surface protection film which is mainly used in the optical field and is temporarily installed on the surface of various optical films such as polarizers and retardation plates. The fish-eye (fish-eye) or curling of the protective film will cause pitting or deformation on the adherend, and it will not pollute the adherend surface. Background technique [0002] The surface protection film is required to have a slight adhesive force, while maintaining the adhesive function of enduring harsh use conditions, it can be easily peeled off when the surface protection function is completed, and it is required not to pollute the adherend and leave no residue on the adherend Traces of surface protection film. In the case of optical applications, it is particularly strictly required not to contaminate the adherend, and not to cause craters or deformations on the adherend due to convex defects such as fish eyes or wrinkles in the...

Claims

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Application Information

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IPC IPC(8): C09J7/02B32B27/28B32B27/32C09J123/08C09J7/29
CPCB32B7/12B32B2457/00B32B27/08B32B2571/00B32B2405/00B32B2551/00B32B27/308B32B2307/746B32B2270/00C09J123/0869C09J123/0815B32B27/32B32B2250/246G02B1/105B32B2307/538C09J2203/318C09J2423/04C09J2423/046C09J2423/106C09J7/29Y10T428/24355G02B1/14C09J2301/122C09J2301/312
Inventor 浅田善康寺内浩今井史朗
Owner TORAY ADVANCED FILM CO LTD