US Patent No. 10,066,098

STYRENIC BLOCK COPOLYMER COMPOSITIONS


Patent No. 10,066,098
Issue Date September 04, 2018
Title Styrenic Block Copolymer Compositions
Inventorship John E. Flood, Houston, TX (US)
Kathryn J. Wright, Houston, TX (US)
Xavier D. Muyldermans, Mont St. Guibert (BE)
Mike Heniff, Houston, TX (US)
Carl L. Willis, Houston, TX (US)
Yonghua Zhou, Houston, TX (US)
Aaron Brothers, Houston, TX (US)
Assignee Kraton Polymers U.S. LLC, Houston, TX (US)

Claim of US Patent No. 10,066,098

1. A block copolymer composition comprising:a. 0 to 5 weight percent of a tetra-branched block copolymer (IV) having a number average molecular weight of 44,000 to 80,000 represented by the general formula (A-B)4X;
b. greater than 0 to 60 weight percent of a tri-branched block copolymer (III) having a number average molecular weight of from 33,000 to 60,000 represented by the general formula (A-B)3X;
c. 40 to 95 weight percent of a di-branched block copolymer (II) having a number average molecular weight of from 22,000 to 40,000 represented by the general formula (A-B)2X; and
d. 2 to 10 weight percent of a linear diblock copolymer (I) having a number average molecular weight of from 11,000 to 20,000 represented by the general formula A-B; where:
i. A represents a polymer block of a mono alkenyl arene, wherein the A block has a number average molecular weight ranging from 4,000 to 7,000 g/mol;
ii. B represents a polymer block of a conjugated diene, wherein the B block has a number average molecular weight ranging from 7,000 to 13,000 g/mol and a vinyl content of 30 to 50 mol %; and
iii. X represents the residue of an alkoxy silane coupling agent;
wherein the block copolymer composition has a solution viscosity ranging from 100 to 400 centipoise (cP), as measured in 20 wt. % of toluene at 25° C.