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Protective film for back of brightening film and preparation method thereof

A protective film, selected technology, applied in the field of protective film for the back of the brightness enhancement film and its preparation, can solve the problems such as difficult peeling of the protective film, achieve adhesion stability and surface adhesion, good adhesion stability, Moderate peeling effect

Active Publication Date: 2020-07-21
NINGBO EXCITON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing protective film is difficult to peel off, the invention provides a protective film for the back of the brightness enhancement film and its preparation method

Method used

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  • Protective film for back of brightening film and preparation method thereof
  • Protective film for back of brightening film and preparation method thereof
  • Protective film for back of brightening film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The protective film provided by the invention sequentially includes a surface layer, a core layer and an adhesive layer. The surface layer is composed of ethylene-propylene block copolymer and low-density polyethylene in a weight ratio of 85:15 (that is, the surface layer includes 85% of ethylene-propylene block copolymer and 15% of low-density polyethylene). The density of ethylene-propylene block copolymer is 0.90g / cm 3 , The melt index is 9.0g / 10min. The density of low density polyethylene is 0.92g / cm 3 , The melt index is 4.0g / 10min.

[0038] The core layer is made of ethylene-propylene block copolymer with a density of 0.90g / cm 3 , The melt index is 9.0g / 10min.

[0039] The adhesive layer is made of hydrogenated styrene-butadiene block copolymer, ethylene-octene copolymer and stress-absorbing polymer in a weight ratio of 15:80:5 (that is, the adhesive layer includes hydrogenated styrene-butadiene Diene block copolymer 15%, ethylene-octene copolymer 80%, and pr...

Embodiment 2

[0042]As the protective film provided in Example 1, the difference is:

[0043] The surface layer is made of ethylene-propylene block copolymer and low-density polyethylene in a weight ratio of 80:20.

[0044] The adhesive layer is made of hydrogenated styrene-butadiene block copolymer, ethylene-octene copolymer and propylene-tetramethylpentene copolymer in a weight ratio of 18:84:8. The density of hydrogenated styrene-butadiene block is 0.90g / cm 3 . The density of ethylene-octene copolymer is 0.88g / cm 3 , The melt index is 5.0g / 10min.

Embodiment 3

[0046] As the protective film provided in Example 1, the difference is:

[0047] The surface layer is made of ethylene-propylene block copolymer and low-density polyethylene in a weight ratio of 75:25. Among them, the density of ethylene-propylene block copolymer is 0.91g / cm 3 , The melt index is 4.0g / 10min. The density of low density polyethylene is 0.93g / cm 3 , The melt index is 6.0g / 10min.

[0048] The adhesive layer is made of hydrogenated styrene-butadiene block copolymer, ethylene-octene copolymer and propylene-tetramethylpentene copolymer in a weight ratio of 22:68:10. The content of styrene in the hydrogenated styrene-butadiene block copolymer is 10%, and the density is 0.94g / cm 3 . The density of ethylene-octene copolymer is 0.90g / cm 3 , The melt index is 9.0g / 10min.

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Abstract

The invention relates to the field of protective film materials, in particular to a protective film of a brightening back and a preparation method thereof. In order to solve the problem that an existing brightening back protective film is difficult to peel off, the invention provides the protective film for a brightening back and the preparation method thereof. The protective film comprises a surface layer, a core layer and an adhesive layer, wherein the surface layer comprises polypropylene resin, the core layer is selected from polypropylene resin, and the adhesive layer comprises styrenic thermoplastic elastomer, polyolefin resin and stress absorbing polymer. The protective film has the advantages of good initial adhesion, easiness in stripping the protective film from the end part of the back, moderate stripping force of the protective film, and small change of the viscosity along with the influence of time and pressure, and is suitable for being used as a protective film of a brightening back.

Description

technical field [0001] The invention relates to the field of protective film materials, in particular to a protective film for the back of a brightness enhancement film and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the electronics industry, the demand for ultra-thin displays such as liquid crystal displays is also increasing. The liquid crystal display is mainly composed of a variety of optical films. To prevent optical films from being stained or scratched during handling and assembly, their surfaces need to be protected. As a protective film for the back of the brightness enhancement film, the protective film is required to have good initial adhesion, and after the protective film is bonded to the back of the brightness enhancement film, it will be stored under specific temperature and pressure conditions, so that it will not be difficult to peel off, The peeling force is seriously climbing and other proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/29C09J7/30C09J123/08C09J153/02C08L53/00C08L23/06
CPCC09J7/29C09J7/30C09J123/0815C09J153/025C09J2203/318C09J2453/006C09J2423/046C08L53/025C08L23/14C08L23/0815
Inventor 唐海江陈强胡金福袁思锐夏寅郭俊超李刚张彦
Owner NINGBO EXCITON TECH
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