Claims
- 1. A copolymer derived from pivalolactone and a diene selected from the group consisting of isoprene and butadiene, said copolymer being of the formula ##STR17## wherein l and n are about 5 to 4,000 and m is about 25 to 25,000, and wherein the molecular weights of the polypivalolactone segments are about 500 to 400,000 and the molecular weights of the polydiene segments are about 1300 to 1,700,000, said copolymer being further characterized by having a melt index of zero at 180.degree. C. and at least 2.0 at 250.degree. C.
- 2. A copolymer according to claim 1 wherein l and n are 15 to 200 and m is 100 to 5,000.
- 3. A copolymer according to claim 1 wherein the diene unit is isoprene.
- 4. A copolymer according to claim 1 wherein the diene unit is butadiene.
- 5. An exercised copolymer according to claim 1.
- 6. An article of manufacture comprising the copolymer of claim 1.
- 7. An article according to claim 6 in the form of a fiber.
- 8. An article according to claim 6 in the form of a film.
- 9. An aritcle according to claim 6 in the form of a molded object.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a division of application Ser. No. 413,367, filed Nov. 6, 1973, now U.S. Pat. No. 3,907,933, which is in turn a division of application Ser. No. 324,502, filed Jan. 17, 1973, now U.S. Pat. No. 3,821,331, which is in turn a continuation-in-part of application Ser. No. 227,258, filed Feb. 17, 1972, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
7,003,074 |
Sep 1971 |
NL |
Divisions (2)
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Number |
Date |
Country |
Parent |
413367 |
Nov 1973 |
|
Parent |
324502 |
Jan 1973 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
227258 |
Feb 1972 |
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