Dissimilar arm asymmetric radial or star block copolymers...

Details Dissimilar arm asymmetric radial or star block copolymers... Dissimilar arm asymmetric radial or star block copolymers...

C - Chemistry, Metallurgy

08

F

C08F 293/00 (2006.01) C08F 297/04 (2006.01) C08L 53/02 (2006.01) C09J 153/02 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2135266

A B S T R A C T DISSIMILAR ARM ASYMMETRIC RADIAL OR STAR BLOCK COPOLYMERS FOR ADHESIVES AND SEALANTS Radial or star asymmetric block copolymer of the following formulae (I) (A-HD)x-Y-(UD)z or (II) (UD-A-HD)X-Y or (III) ((UD)y-A-HD)x-Y-(UD)z or (IV) (A-HD)1)X-Y-(HD2)2 or (V) (HD2-A-HD1)X-Y or (VI) ((HD2)2)y A-HD1)X-Y(HD2)2 wherein A is a vinyl aromatic hydrocarbon block having a molecular weight of from 4000 to 20,000, HD is a hydrogenated conjugated diene block having a molecular weight of from 10,000 to 100,000, Y is a multifunctional coupling agent, UD is an unhydrogenated conjugated diene block having a molecular weight of from 1000 to 80,000, x is an integer from 2 to 20, y is 0 or 1, z is an integer from 1 to 10, and x + z ranges from 3 to 30; functionalized derivatives thereof and improved adhesive and sealant compositions containing them.

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