Linear alternating-block copolymers

Details Linear alternating-block copolymers Linear alternating-block copolymers

C - Chemistry, Metallurgy

08

F

400/2043

C08F 8/04 (2006.01) C08F 297/04 (2006.01) C08F 299/00 (2006.01) C08L 53/00 (2006.01) C08L 53/02 (2006.01) C09J 153/00 (2006.01) C09J 153/02 (2006.01)

Patent

CA 2003057

CASE 2942 LINEAR ALTERNATING-BLOCK COPOLYMERS ABSTRACT Lineal copolymers with four alternating blocks, represented by the following formula: Bl - T - Al - B2 - A2 where: A1 and A2 are polyvinylaromatic blocks, B1 and B2 are blocks consisting of ethylene-butene-l or ethylene-propylene copolymers, and T is a statistical terpolymer segment formed from ethylene-propylene- vinylarene or ethylene-butene-l- vinylarene monomer units. The copolymers are characterised by a weight-average molecular weight of between 20,000 and 300,000 and a total content of vinylaromatic units of between 10 and 60% by weight. The ratio of the weight-average molecular weight of block Al to that of block A2 is a number between 0.25 and 2.0, and the ratio of the weight- average molecular weight of block B1 to that of block B2 is a number between 0.05 and 0.5.. The copolymers exhibit an optimum balance of mechanical, rheological and thermo-oxidation resistance properties and can be obtained by hydrogenating block-copolymers of vinylaromatic monomers with conjugated diene monomers.

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