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Surface protection film

A technology of surface protection film and outer surface layer, which is applied in the field of surface protection film, can solve problems such as difficulty in use, reduced visibility, and insufficient oligomer effect, and achieve high industrial value and good adhesion

Active Publication Date: 2016-07-20
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For example, in the state where such a surface protection film is bonded to an adherend, the process of directly heat-treating in a high-temperature atmosphere, or the situation of being exposed to a high-temperature atmosphere during transportation or storage (for example, Patent Document 1, 2) In the case of use, the deformation caused by the melting or shrinkage of the base film is large, making it difficult to use
[0005] Therefore, when using a surface protection film made of a polyester film with better heat resistance as a base material, after heat treatment in a high-temperature atmosphere, low molecular weight substances and oligomers in the polyester film constituting the surface protection film (Mainly ester cyclic trimer) precipitates and crystallizes, resulting in increased film haze, and consequently reduced visibility
[0006] Therefore, in order to solve the above-mentioned problems, in the case of seeking measures to prevent oligomer precipitation, for example, when the oligomer precipitation prevention layer described in Patent Document 3 is laminated on the surface of the polyester film, the precipitation of oligomers is suppressed, but , the adhesion to the functional layer, such as the adhesion to the hard coat layer is insufficient
[0007] On the other hand, when a general-purpose easy-adhesive layer for a hard coat layer (for example, Patent Document 4) is usually laminated on a polyester film, the adhesion to the hard coat layer is good, however, preventing oligomer The precipitation effect is not sufficient

Method used

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  • Surface protection film

Examples

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preparation example Construction

[0092] When preparing the above-mentioned acrylic polymer, depending on the type of polymerization reaction, a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator (photoinitiator) can be used. A polymerization initiator can be used individually or in combination of 2 or more types.

[0093] The above-mentioned photopolymerization initiator is not particularly limited, and for example, benzoin ether-based photopolymerization initiators, acetophenone-based photopolymerization initiators, α-ketol-based photopolymerization initiators, aromatic sulfonyl chloride-based photopolymerization initiators, and aromatic sulfonyl chloride-based photopolymerization initiators can be used. Initiators, photoactive oxime-based photopolymerization initiators, benzoin-based photopolymerization initiators, benzil-based photopolymerization initiators, benzophenone-based photopolymerization initiators, ketal-based photopolymerization initiators, thio...

Embodiment 1

[0233] On the surface of one coating layer of the polyester film F1, an adhesive layer composed of the following adhesive layer composition was applied so that the thickness (after drying) became 25 μm, and dried at 100° C. for 5 minutes to obtain a surface protection film. .

[0234] (Adhesive layer composition A)

[0235] Using a conventional method, butyl acrylate (100 parts by weight) and 6 parts by weight of acrylic acid were copolymerized in ethyl acetate to obtain a solution of an acrylic copolymer with a weight average molecular weight of 600,000 (in terms of polystyrene) (solid content 30 weight%). With respect to 100 parts by weight of the acrylic copolymer (solid content), 0.2 parts by weight of N,N-dimethylaminoethyl acrylate, and 6 parts by weight of TETRADC (manufactured by Mitsubishi Gas Chemical) as an epoxy-based crosslinking agent were added , to obtain the adhesive layer composition.

Embodiment 2～22

[0237] In Example 1, except having changed the kind of polyester film, and a coating liquid composition, it manufactured similarly to Example 1, and obtained the surface protection film.

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Abstract

Provided is a surface protection film able to exhibit, at a high level, conflicting characteristics, namely the prevention of oligomer precipitation following heat treatment and adherence with respect to a functional layer such as a hard coat layer. The surface protection film is obtained by forming a coating layer on both surfaces of a multilayer polyester film, which has a laminated structure having at least three layers and in which the softening point of the outermost surface polyester layers is higher than the softening point of an intermediate layer, and forming a pressure-sensitive adhesive layer on the surface of one of the coating layers. The coating layers are formed from a coating liquid that contains a crosslinking agent at a quantity of 70wt% or higher relative to involatile components.

Description

technical field [0001] The present invention relates to a surface protective film suitable for being adhered to synthetic resin plates, glass plates, metal plates, optical parts, automobile parts, electrical / electronic parts, building material parts, stationery / office supplies parts, etc. Surface protection film for surface protection of attachments. More specifically, it relates to a surface protection film used as an optical component requiring particularly high visibility, such as a glass substrate, a light diffusion film, a liquid crystal display (polarizing plate, retardation plate, light guide plate) , prism plate, etc.), touch panels, organic EL displays, plasma displays, etc., the visibility after heat treatment and the adhesion to the hard coat layer are good. Background technique [0002] In the past, in order to prevent synthetic resin plates, glass plates, metal plates, optical components (glass substrates, light diffusion films, liquid crystal display component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36
CPCB32B27/36B32B27/08B32B2255/10B32B2255/26B32B2307/306B32B2307/412B32B2405/00C09J2467/006C09J7/29C09J2301/408
Inventor 井崎公裕川崎阳一
Owner MITSUBISHI CHEM CORP