发明授权
US5399628A Block copolymers of monovinylarenes and conjugated dienes containing two interior tapered blocks 失效
含有两个内锥形嵌段的单乙烯基芳烃和共轭二烯的嵌段共聚物

Block copolymers of monovinylarenes and conjugated dienes containing two
interior tapered blocks
摘要:
A method for preparing tapered block copolymers in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomer in the presence of a randomizer; (2) an initiator and monovinylaromatic monomer; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; (5) conjugated diene monomer; and (6) a coupling agent; and the polymodal tapered block copolymers prepared thereby. The copolymers are particularly useful neat or in blends for applications such as packaging and food or drink containers which require transparency and good environmental stress crack resistance.
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