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Novel high-viscosity protective film and preparation method thereof

A protective film, high-viscosity technology, applied in the direction of adhesives, film/sheet-like adhesives, etc., can solve the problems of easy adhesion between the surface layer and the adhesive layer, and it is not easy to peel off, so as to achieve a small effect on the adhesive force with temperature and time changes, Easy peeling, good sticky effect

Active Publication Date: 2019-06-11
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 surface layer and the adhesive layer are easy to stick and not easy to peel off during the unwinding process of the high-viscosity protective film, the present invention provides a new type of high-viscosity protective film and its preparation method

Method used

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  • Novel high-viscosity protective film and preparation method thereof
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  • Novel high-viscosity protective film and preparation method thereof

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Embodiment 1

[0029] The novel high-viscosity protective film provided by the invention sequentially comprises a surface layer, a core layer and an adhesive layer.

[0030] The surface layer is made of ethylene-propylene block copolymer and release resin at a ratio of 80%:20%. The density of ethylene-propylene block copolymer is 0.90g / cm 3 , The melt index is 9.0g / 10min. The release resin is a vinyl polymer chemically modified by styrene (produced by Mitsubishi Chemical, the brand is W200P).

[0031] The core layer adopts ethylene-propylene block copolymer with a weight percentage of 100%, and its density is 0.90g / cm 3 , The melt index is 5.0g / 10min.

[0032] The adhesive layer adopts methyl methacrylate-butyl acrylate-methyl methacrylate block copolymer with a density of 1.13g / cm 3 , The melt index is 1.2g / 10min.

[0033] The surface layer had a thickness of 10 μm, the core layer had a thickness of 30 μm, and the adhesive layer had a thickness of 10 μm.

Embodiment 2

[0035] As the novel high-viscosity protective film that embodiment 1 provides, the difference is:

[0036] The surface layer is made of ethylene-propylene block copolymer and high-density polyethylene at a ratio of 80%:20%. The density of ethylene-propylene block copolymer is 0.90g / cm 3 , The melt index is 9.0g / 10min. The density of high-density polyethylene is 0.945g / cm 3 .

Embodiment 3

[0038] As the novel high-viscosity protective film that embodiment 1 provides, the difference is:

[0039] The surface layer is made of ethylene-propylene block copolymer, high-density polyethylene and release resin at a ratio of 80%:10%:10%. The density of ethylene-propylene block copolymer is 0.91g / cm 3 , The melt index is 4.0g / 10min. The density of high-density polyethylene is 0.963g / cm 3 . The release resin is a vinyl polymer chemically modified by styrene (produced by Mitsubishi Chemical, the brand is W200P).

[0040] The adhesive layer adopts methyl methacrylate-butyl acrylate-methyl methacrylate block copolymer. Its density is 1.11g / cm 3 , The melt index is 1.5g / 10min.

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Abstract

The invention relates to the field of protective film materials, and particularly relates to a novel high-viscosity protective film and a preparation method thereof. In order to solve the problems that in an unwinding process of the high-viscosity protective film, a surface layer is easily adhered to an adhesive layer and peeling is difficult, the invention provides the novel high-viscosity protective film and the preparation method thereof. The high-viscosity protective film sequentially comprises a surface layer, a core layer and an adhesive layer; the surface layer comprises 55-80% of an ethylene-propylene block copolymer, 0-30% of high-density polyethylene and 0-20% of release resin, wherein the total amount of the high-density polyethylene and the release resin is 20-45%. The protective film is high in adhesive force and good in attaching effect, the change of adhesive force is small along with temperature and time, peeling is easy, residual adhesive is avoided, unwinding is easy,and the novel high-viscosity protective film is suitable for being used as an optical material surface protective film with high viscosity requirements.

Description

technical field [0001] The invention relates to the field of protective film materials, in particular to a novel high-viscosity protective 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 has also increased. 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. Since the protective film is a film composed of three layers of surface layer, core layer and adhesive layer, it is usually rolled into a roll shape, especially for high-viscosity protective films. The layers are closely attached, and the tackifying ingredients in the adhesive layer are easy to migrate to the surface layer, causing problems such as difficulty in unwinding and insufficient adhesion of the adhesive l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/29
Inventor 唐海江陈强胡金福夏寅周鼎冯金刚李刚张彦
Owner NINGBO EXCITON TECH
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