Patent ID: 6177540
Filing Date: 2001-01-23
Classification: C09J,Y10T

Abstract:
A pressure sensitive adhesive composition comprising a random star polymer with crosslinkable functionality and a multifunctional crosslinking agent, the star polymer comprising: a mercaptan core and three or more polymer segments which extend radially from the mercaptan core wherein the mercaptan core is of the general formula:X--(Y.sub.1 --SH).sub.a (Y.sub.2 --SH).sub.b (Y.sub.3 --SH).sub.c (Y.sub.4 --SH).sub.d (Y.sub.5 --SH).sub.e (Y.sub.6 --SH).sub.f (Y.sub.7 --SH).sub.g (Y.sub.8 --SH).sub.hwherein X is derived from an organic radical having a valence of 3 to 8; Y.sub.1, Y.sub.2, Y.sub.3, Y.sub.4, Y.sub.5, Y.sub.6, Y.sub.7 and Y.sub.8 are the same or different and each comprise C.sub.2-10 alkanoic acids; a, b, c, d, e, f, g, h are integers from 0 to 8 provided that a+b+c+d+e+f+g+h.ltoreq.8, and wherein said multifunctional crosslinking agent comprises soluble metal compounds selected from the group consisting of aluminum isopropoxide, titanium ester, chelated aluminum esters and chelated titanium esters.