Invention Grant
- Patent Title: Tapered block copolymers of monivinylarenes and conjugated dienes
- Patent Title (中): 单乙烯基芳烃和共轭二烯的嵌段嵌段共聚物
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Application No.: US963964Application Date: 1997-11-04
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Publication No.: US5910546APublication Date: 1999-06-08
- Inventor: William J. Trepka , George A. Moczygemba , Nathan E. Stacy , Ralph C. Farrar, Jr.
- Applicant: William J. Trepka , George A. Moczygemba , Nathan E. Stacy , Ralph C. Farrar, Jr.
- Applicant Address: OK Bartlesville
- Assignee: Phillips Petroleum Company
- Current Assignee: Phillips Petroleum Company
- Current Assignee Address: OK Bartlesville
- Main IPC: C08F8/44
- IPC: C08F8/44 ; C08F297/02 ; C08F297/04 ; C08G81/02 ; C08L25/04 ; C08L25/06 ; C08L53/02
Abstract:
A method for preparing tapered block copolymers which are particularly useful for blend components in blends with polymers of styrene. In the first embodiment of this invention the copolymers are prepared 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; and (4) a coupling agent; to produce a polymodal tapered block copolymer. In a second embodiment of the invention tapered block copolymers are prepared 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) a mixture of monovinylaromatic and conjugated diene monomers; and (5) a coupling agent; to produce a polymodal tapered block copolymer. The invention copolymers and blends of the invention copolymers with polymers of styrene are particularly useful for applications such as packaging and food or drink containers which require transparency, low blueness, colorlessness, good impact strength and ductility.
Public/Granted literature
- US5318759A Membrane/PSA-deoxo process for nitrogen production Public/Granted day:1994-06-07
Information query
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