Modified block copolymer process

Details Modified block copolymer process Modified block copolymer process

C - Chemistry, Metallurgy

08

F

400/2044

C08F 8/46 (2006.01) C08F 257/00 (2006.01)

Patent

CA 1257427

A B S T R A C T MODIFIED BLOCK COPOLYMER PROCESS Process for preparing a modified block copolymer comprising dissolving a block copolymer of the formula Bn(AB)oAp where n = 0 or 1, o = 0 or an integer of at least 1 and p = 0 or 1 and an acid moiety or its derivative in a suitable solvent, adding a free radical initiator, graft-reacting under free radical conditions, and recovering modified polymer product, wherein each A is predominantly a polymerized mono- alkenylaromatic hydrocarbon block having an average molecular weight of about 2,000 to 115,000; each B prior to hydrogenation is predominantly a polymerized conjugated diene hydrocarbon block having an average molecular weight of about 20,000 to 450,000; the blocks A constitute 5-95 weight per cent of the copolymer; the unsaturation of the block B is less than 10% of the original unsaturation; and the unsaturation of the A blocks is above 50% of the original unsaturation. The process of the invention produces functionalized block copolymers which contain low residual unsaturation and high functionality. The modified block copolymers can be used for adhesives and sealants or compounded and extruded or moulded.

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