Adhesive sheet

A technology of adhesive sheets and adhesives, applied in the direction of polyether adhesives, conductive adhesives, adhesive types, etc., can solve problems such as adverse effects and pollution of optical properties of optical components, and achieve low pollution, Improved inspection accuracy and reduced appearance defects

Inactive Publication Date: 2013-12-25
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In addition, in surface protection film applications (especially surface protection film applications for optical members), etc., the adhesive residue on the surface of the adherend (optical member, etc.) when the adhesive sheet is peeled off (so-called "glue residue" ) or the contamination of the surface of the adherend caused by the transfer of components contained in the adhesive layer to the surface of the adherend, etc., will adversely affect the optical characteristics of the optical member, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0271] Manufacturing example 1 [Manufacturing example of transparent film substrate]

[0272] (Preparation of a composition for forming a top coat layer)

[0273] Charge 25g of toluene into the reactor, raise the temperature inside the reactor to 105°C, then add 30g of methyl methacrylate (MMA) and 10g of n-butyl acrylate (BA) dropwise to the above reactor continuously in 2 hours. ), 5g cyclohexyl methacrylate (CHMA), 0.2g azobisisobutyronitrile mixed solution. After completion of the dropwise addition, the temperature in the reactor was adjusted to 110 to 115°C, and the same temperature was maintained for 3 hours to carry out a copolymerization reaction. After 3 hours, a mixed solution of 4 g of toluene and 0.1 g of azobisisobutyronitrile was dropped into the reactor, and the same temperature was maintained for 1 hour. Then, the temperature in the reactor was cooled to 90°C, and toluene was added to adjust the NV to 5% by weight, and an acrylic polymer containing 5% by weig...

manufacture example 2

[0277] Manufacturing example 2 [Manufacturing example of transparent film substrate]

[0278]In Production Example 1, the amount of conductive polymer solution 1 used was changed from 1.2 g to 2.5 g, and the amount of ethylene glycol monomethyl ether used was changed from 55 g to 17 g. In addition, the solution for forming a top coat layer was applied so that the thickness after drying was about 20 nm. Otherwise, it carried out similarly to Production Example 1, and produced the transparent film base material (it may also be called "substrate 2") which has a transparent top coat layer on one side of a PET film.

manufacture example 3

[0279] Manufacturing example 3 [Manufacturing example of transparent film substrate]

[0280] In Production Example 1, the amount of ethylene glycol monoethyl ether used was changed from 40 g to 19 g, the amount of conductive polymer solution 1 used was changed from 1.2 g to 0.7 g, and ethylene glycol monomethyl ether was not used. In addition, the solution for forming a top coat layer was applied so that the thickness after drying was about 40 nm. Otherwise, it carried out similarly to the manufacture example 1, and produced the transparent film base material (it may also be called "substrate 3") which has a transparent top coat layer on one side of a PET film.

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Abstract

The present invention provides an adhesive sheet that has an acrylic adhesive layer formed from a water-dispersed acrylic adhesive composition, said composition comprising a specific acetylenediol, a polyether compound having a specific structure, and an acrylic emulsion polymer obtained from feedstock monomers having a specific composition, on at least one surface of a transparent film substrate having a top-coat layer that has a specific composition and a controlled average thickness and amount of variation in thickness. Said adhesive sheet was found to be highly scratch-resistant and minimally polluting, prevent increases in adhesive strength, and have excellent antistatic performance and appearance characteristics.

Description

technical field [0001] The present invention relates to a re-peelable adhesive sheet. Specifically, the present invention relates to a re-peelable PSA sheet that is excellent in appearance characteristics, and also excellent in resistance to increase in adhesion over time, low contamination, scratch resistance, and antistatic properties. Background technique [0002] In the manufacturing and processing of optical members (optical materials) represented by optical films such as polarizing plates, retardation plates, and anti-reflective plates, the surface The protective film is pasted on the surface of the optical member and used (see Patent Documents 1 and 2). As these surface protection films, generally used are releasable pressure-sensitive adhesive sheets in which a releasable pressure-sensitive adhesive layer is provided on the surface of a plastic film substrate. [0003] Conventionally, in the use of these surface protection films, solvent-based acrylic adhesives hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J9/02C09J11/06C09J133/08C09J171/02C09J165/00C09J7/29
CPCC09J165/00C08G2261/135C08G2261/1424C08G2261/3223C08G2261/51C08G2261/76C08G2261/794C09J133/02C08K5/0025C08K5/34922C09J2203/318C09J2433/00C09J2433/006C09J2465/006C09J2467/006C09D133/12C08G2650/58C09J7/38C09J7/22C09J7/29C08L25/18C08L33/08Y10T428/2848Y10T428/24612Y10T428/265C09J2301/162C08L25/04C08L65/00C08F220/1808C08F220/06C08F216/1433C08F220/14C08F220/1804C08F220/1806C08F220/20C09J2301/30C09J11/00C09J7/385G02B1/16G02B1/14
Inventor 天野立巳森本有三井数马高岛杏子
Owner NITTO DENKO CORP
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