Surface protective film

A surface protection film, optical technology, applied in the direction of film/sheet adhesive, adhesive type, adhesive additive, etc., can solve the problem of protective glass breakage, etc., to inhibit the color change and adhesion stability Excellent, low transmittance effect

Pending Publication Date: 2018-10-09
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The used protective film will be peeled and removed when the protective film is no longer needed, but when peeling and removing the protective film attached to the protective glass used in thinned smartphones, etc. It is difficult to peel and remove the protective film with high resultant force, which may cause damage to the protective glass, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0185] [Preparation of Acrylic Polymer]

[0186] Put 200 parts by weight of 2-ethylhexyl acrylate (2EHA) and 8 parts by weight of 2-hydroxyethyl acrylate (HEA) into a four-necked flask with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a condenser, as a polymerization initiator 0.4 parts by weight of 2,2'-azobisisobutyronitrile, 312 parts by weight of ethyl acetate as a solvent, introducing nitrogen gas while stirring slowly, keeping the liquid temperature in the flask at about 65°C, and performing 6 Polymerization was carried out for 1 hour to prepare an acrylic polymer solution (40% by weight). The weight average molecular weight (Mw) of the said acrylic polymer was 540,000, and the glass transition temperature (Tg) was -68 degreeC.

[0187] [Preparation of Acrylic Binder Solution]

[0188] The above-mentioned acrylic polymer solution (40% by weight) was diluted to 29% by weight with ethyl acetate, and isocyanurate of hexamethylene diisocyanate was added ...

Embodiment 2～5、 comparative example 1～3

[0192] Based on the compounding content shown in Table 1, the surface protection film for optics was produced by the method similar to Example 1.

Embodiment 6 and 7

[0194] Using a polyester film with a thickness of 12 μm (manufactured by Mitsubishi Plastics Corporation, trade name: Diafoil T100G12) instead of the base material used in Example 1, an optical film was produced in the same manner as in Example 1 based on the composition shown in Table 1. Surface protection film.

[0195]

[0196] Using a polyester film with a thickness of 80 μm (manufactured by Toyobo Co., Ltd., trade name: SRF) instead of the base material used in Example 1, an optical surface was produced by the same method as in Example 1 based on the composition shown in Table 1. protective film.

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Abstract

The present invention relates to a surface protective film. The present invention provides an optical surface protective film which has low transmittance of ultraviolet rays, suppresses change in color tone, and is excellent in adhesion stability. The surface protective film for optics of the present invention has a substrate formed of a polyester resin and an adhesive layer formed of an adhesivecomposition provided on one surface of the substrate, wherein the surface protection The b* value of the film is 2 or less, and the transmittance of the surface protective film at a wavelength of 365nm is 2% or less. After the pressure-sensitive adhesive layer is adhered to the glass, the adhesive is heated at 100 DEG C for 30 minutes. The rate of change of the force with respect to the adhesiveforce before heating is +-30% or less.

Description

technical field [0001] The present invention relates to a surface protection film for optics. In particular, it is used to protect the surface of optical members (such as polarizing plates for liquid crystal displays, wave plates, retardation plates, optical compensation films, reflective sheets, brightness enhancement films, protective glasses for displays, etc.), and to protect them from ultraviolet rays. On the other hand, a surface protection film for optics is useful for protecting members that are prone to deterioration and the like from ultraviolet rays. Background technique [0002] A protective film generally has a structure in which an adhesive layer is provided on a film-form base material. The protective film is used for the purpose of bonding it to an optical member as an adherend via the adhesive layer, thereby protecting the optical member from surface damage during processing, transportation, inspection, etc. , stains. For example, the panel of a liquid cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/30C09J7/25C09J133/08C09J11/06
CPCC09J7/25C09J7/30C09J11/06C09J133/066C09J2467/006C09J2433/00C09J2301/122C08K5/29C08K5/3492C08K5/07
Inventor 三井数马渡部奈津子野中崇弘林圭治
Owner NITTO DENKO CORP
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