Block copolymer composition and process for the preparation...

Details Block copolymer composition and process for the preparation... Block copolymer composition and process for the preparation...

C - Chemistry, Metallurgy

08

L

400/3032, 400/30

C08L 53/02 (2006.01) C08F 297/04 (2006.01) C09J 153/02 (2006.01)

Patent

CA 1326087

ABSTRACT A block copolymer composition comprising 40- 85% by weight of a block copolymer A1-B1 from styrene and isoprene or butadiene, respectively, A1 being < 20% by weight of (A1+B1), A1 and B1 having a molecular weight > 12,000 and > 150,000, respectively, and 15- 60% by weight of a block copolymer A2-B2-A3 from styrene, isoprene or butadiene, and styrene respectively, A2+A3 being > 20% by weight of A2+B2+A3, A2 and A3 having a molecular weight > 12,000 and (molecular weight of B2) < (molecular weight of B1)/1.5, an adhesive composition comprising 100 parts by weight (pbw) of said block copolymer composition, 20-300 pbw of a tackifying resin, and 0-200 pbw of a softener, and a process for the preparation of said adhesive composition by mixing the components in question.

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