Tapered block copolymers of conjugated dienes and...

Details Tapered block copolymers of conjugated dienes and... Tapered block copolymers of conjugated dienes and...

C - Chemistry, Metallurgy

08

F

C08F 297/04 (2006.01)

Patent

CA 2060020

A method for preparing tapered block copolymers in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and a mixture of monovinylaromatic and conjugated diene monomers; (3) an initiator and a mixture of monovinylaromatic and conjugated diene monomers; and (4) a coupling agent to produce a polymodal tapered block copolymer. The copolymers are particularly useful for packaging applications which require good environmental stress crack resistance.

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