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:
Dec. 31, 2019
Filed:
Apr. 03, 2018
Kuraray Co., Ltd., Kurashiki-shi, JP;
KURARAY CO., LTD., Kurashiki-shi, JP;
Abstract
Described herein is a pressure-sensitive adhesive composition containing an acrylic block copolymer (I) having a polymer block (A) containing methacrylic acid ester units and a polymer block (B) containing acrylic acid ester units which are derived from an acrylic acid ester (1) represented by the general formula CH═CH—COOR(1) (wherein Ris an organic group of 4 to 6 carbon atoms) and an acrylic acid ester (2) represented by the general formula CH═CH—COOR(2) (wherein Ris an organic group of 7 to 12 carbon atoms), the mass ratio (1)/(2) of said acrylic acid ester (1) to said acrylic acid ester (2) being 65/35 to 20/80. The tan δ value of viscoelasticity of the acrylic block copolymer (I), as measured at a frequency of 1 Hz, is 1×10to 1×10in the range of 50 to 100° C.