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Pressure-sensitive adhesive composition for optical members and pressure-sensitive adhesive tape for optical members

A technology for optical components and adhesives, applied in the direction of adhesive types, ester copolymer adhesives, film/sheet-like adhesives, etc., which can solve the problems of insufficient physical properties and heat resistance of the adhesive.

Active Publication Date: 2012-11-21
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the acrylic transparent adhesive composition described in Patent Document 1 has a low molecular weight of the resin having a hydroxyl group to be mixed, it suffers from the adhesive properties and resistance to adhesives or adhesive tapes. Can't say enough about heat

Method used

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  • Pressure-sensitive adhesive composition for optical members and pressure-sensitive adhesive tape for optical members
  • Pressure-sensitive adhesive composition for optical members and pressure-sensitive adhesive tape for optical members
  • Pressure-sensitive adhesive composition for optical members and pressure-sensitive adhesive tape for optical members

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0131] (1) Manufacture of acrylic copolymer

[0132] In a reactor equipped with a thermometer, a stirrer, and a cooling pipe, add 44.5 parts by weight of 2-ethylhexyl acrylate, 30 parts by weight of isobornyl acrylate, 0.5 parts by weight of acrylic acid, 25 parts by weight of 2-hydroxyethyl acrylate, and relative After replacing 100 parts by weight of ethyl acetate with 100 parts by weight of these monomers with nitrogen, the reactor was heated and reflux was started. After 30 minutes, with respect to 100 parts by weight of the monomer, 0.2 parts by weight of tert-hexyl peroxypivalate as a polymerization initiator was diluted with 5 parts by weight of ethyl acetate, and the mixture was dripped over 2 hours in the above-mentioned reactor. The resulting polymerization initiator solution was added. Thereafter, at 70° C., it was refluxed for 8 hours from the addition of the polymerization initiator to obtain an acrylic copolymer solution having a solid content of 50%.

[0133]W...

Embodiment 1-2～1-5

[0138] (Examples 1-2 to 1-5, Comparative Examples 1-1 to 1-3)

[0139] By changing the monomer composition of the acrylic copolymer, except that the acrylic copolymer having the ratio (% by weight) of the constituent units shown in Table 1 was obtained, the same operation as in Example 1-1 was performed to obtain Double-sided adhesive tape for optical members bonded with release polyethylene terephthalate film.

Embodiment 2-1

[0141] (1) Manufacture of acrylic copolymer

[0142] In a reactor equipped with a thermometer, a stirrer, and a cooling pipe, add 59.5 parts by weight of 2-ethylhexyl acrylate, 15 parts by weight of isobornyl acrylate, 0.5 parts by weight of acrylic acid, and 25 parts by weight of N-vinylpyrrolidone. After replacing 100 parts by weight of ethyl acetate with 100 parts by weight of monomers by bubbling with nitrogen, the temperature of the reactor was set at 70° C. under a nitrogen stream. Next, 0.2 parts by weight of tert-hexylperoxypivalate as a polymerization initiator was diluted with 5 parts by weight of ethyl acetate with respect to 100 parts by weight of monomers, and the resulting mixture was added dropwise in the reactor over 2 hours. The resulting polymerization initiator solution. During the reaction, the temperature was controlled by heating and cooling so as to keep the reaction temperature at 70°C. The reaction was performed at 70° C. until 8 hours after the star...

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Abstract

Provided is a pressure-sensitive adhesive composition for optical members which is protected from whitening under high -temperature and high-humidity conditions and which can ensure high reliability. Also provided is a pressure-sensitive adhesive tape for optical members, which is produced using the pressure-sensitive adhesive composition. The pressure -sensitive adhesive composition for optical members comprises an acrylic copolymer obtained by polymerizing a mixed monomer which contains 1 to 25wt% of 2-hydroxyethyl acrylate, 1 to 25wt% of N-vinylpyrrolidone, 0.5 to 30wt% of a monomer having a structure represented by general formula (1-1), or 0.1 to 30wt% of a monomer having a structure represented by general formula (1-2). In general formula (1-1), R1 is hydrogen or methyl; R2 is hydrogen or alkyl having less than 3 carbon atoms; and n is an integer of 8 to 45. In general formula (1-2), R3 is hydrogen or methyl; R4 is alkyl having 3 to 30 carbon atoms; and m is an integer of 8 to 45.

Description

technical field [0001] This invention relates to the adhesive composition for optical members which suppresses the whitening which arises under high temperature, high humidity, and can realize high reliability. Moreover, this invention relates to the adhesive tape for optical members manufactured using this adhesive composition for optical members. Background technique [0002] Display panels are used in various fields, especially in mobile phones, portable information terminals, and the like, not only for image display devices but also for input devices. In such an image display device or input device, the display panel is bonded to a protective plate, a touch panel, or an optical filter for protecting the surface with a highly transparent adhesive such as an acrylic adhesive or an adhesive tape. . [0003] However, conventionally, when an acrylic adhesive is exposed to high temperature and high humidity and then returned to room temperature, the moisture absorbed is cond...

Claims

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Application Information

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IPC IPC(8): C09J133/06C09J7/00C09J133/14G02B5/30C09J7/10
CPCC09J139/06C09J133/08C09J133/14C09J7/385C09J7/10G02B5/30C09J2203/318
Inventor 丸尾耕平户田智基永井康晴杉原拓道
Owner SEKISUI CHEM CO LTD
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