Patent ID: 10519347

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 CH2═CH—COOR1 (1) (wherein R1 is an organic group of 4 to 6 carbon atoms) and an acrylic acid ester (2) represented by the general formula CH2═CH—COOR2 (2) (wherein R2 is 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 1×10−2 to 1×10−1 in the range of 50 to 100° C.