Claims
- 1. A tapered block copolymer of the A-t-B-t-A or A-B-t-A configuration, the A blocks being formed from a monovinyl aromatic compound and the B block being formed from butadiene wherein between 29 and 70 weight percent of the total monovinyl aromatic compound in the tapered block copolymer is isolated.
- 2. A taper ed block copolymer according to claim 1 wherein the monovinyl aromatic compound is styrene.
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application is a divisional of U.S. Ser. No. 647,954, filed Jan. 30, 1991, now U.S. Pat. No. 5,100,939, which is a continuation-in-part application of co-pending applications U.S. Ser. No. 427,431 filed Oct. 27, 1989 now abandoned, and U.S. Ser. No. 502,970 filed Apr. 2, 1990, now abandoned, which are also incorporated herein by reference.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
04115 |
Apr 1989 |
WOX |
Non-Patent Literature Citations (1)
Entry |
J. McGrath, Anionic Polymerization, Kinetics, Mechanisms and Synthesis ACS Symposium Series 166, 397-400 (1981). |
Divisions (1)
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Number |
Date |
Country |
Parent |
647954 |
Jan 1991 |
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Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
427431 |
Oct 1989 |
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Parent |
502970 |
Apr 1990 |
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