发明授权
US5290875A Conjugated diene/monovinylarene block copolymers with multiple tapered
blocks
失效
具有多个锥形嵌段的共轭二烯/单乙烯基芳烃嵌段共聚物
- 专利标题: Conjugated diene/monovinylarene block copolymers with multiple tapered blocks
- 专利标题(中): 具有多个锥形嵌段的共轭二烯/单乙烯基芳烃嵌段共聚物
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申请号: US982938申请日: 1992-11-30
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公开(公告)号: US5290875A公开(公告)日: 1994-03-01
- 发明人: George A. Moczygemba , Nathan E. Stacy , Nancy R. Knight
- 申请人: George A. Moczygemba , Nathan E. Stacy , Nancy R. Knight
- 申请人地址: OK Bartlesville
- 专利权人: Phillips Petroleum Company
- 当前专利权人: Phillips Petroleum Company
- 当前专利权人地址: OK Bartlesville
- 主分类号: C08F297/04
- IPC分类号: C08F297/04
摘要:
A method for preparing polymodal tapered block copolymers in a polymerization process by sequentially charging: (a) an initiator and monovinylaromatic monomers in the presence of a randomizer; (b) an initiator and monovinylaromatic monomers; (c) a mixture of monovinylaromatic and conjugated diene monomers; (d) a mixture of monovinylaromatic and conjugated diene monomers; (e) an initiator and monovinylaromatic monomers; (f) a mixture of monovinylaromatic and conjugated diene monomers; (g) a mixture of monovinylaromatic and conjugated diene monomers; (h) conjugated diene monomers; and (i) a coupling agent. The copolymers are particularly useful for packaging applications which require good environmental stress crack resistance.