Tapered block copolymers of conjugated dienes and monovinylarenes
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United States of America Patent
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Oct 26, 1993
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app pub date -
May 8, 1991
filing date -
May 8, 1991
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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 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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