The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 2017
Filed:
Apr. 23, 2014
Toyo Ink SC Holdings Co., Ltd., Chuo-ku, JP;
Yuki Sato, Tokyo, JP;
Toru Oya, Tokyo, JP;
Yoshitaka Tone, Tokyo, JP;
Takayuki Kobayashi, Tokyo, JP;
TOYO INK SC HOLDINGS CO., LTD., Chuo-ku, JP;
Abstract
The invention provides a pressure-sensitive adhesive composition, which is prepared by using an alcohol solvent to obtain a high-molecular weight acrylic polymer, and exhibits excellent levels of coating liquid storage stability, stability over time in the adhesiveness, aging suitability, adhesive strength, releasability and heat-resistant holding power, as well as providing a pressure-sensitive adhesive sheet. The pressure-sensitive adhesive composition comprises a specific crosslinking agent and an acrylic polymer with a glass transition temperature of −60 to 0° C. obtained by radical polymerization in an alcohol solvent of an ethylenic unsaturated bond-containing monomer comprising specific amounts of specific monomers, wherein the acrylic polymer contains a low-molecular weight component and a high-molecular weight component with an area ratio therebetween of 65/35 to 80/20, and the monomer has a carboxyl group.