Tapered block copolymers of monovinylarenes and conjugated...

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

C - Chemistry, Metallurgy

08

F

C08F 299/00 (2006.01) C08F 297/04 (2006.01) C08G 81/02 (2006.01) C08L 25/06 (2006.01) C08L 53/02 (2006.01)

Patent

CA 2111062

Abstract 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 monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) conjugated diene monomers; and (5) a coupling agent; to produce a polymodal tapered block copolymer. The copolymers are particularly useful for applications such as packaging and food or drink containers which require transparency and good environmental stress crack resistance.

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