US4034021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of pivalolactone and isoprene or butadiene
Assignee: EIDP Inc
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Filing: 1975-06-25
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Granted: 1977-07-05
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Expires: 1995-06-25
Abstract
Abstract Disclosed herein are new, specifically modified, copolymers of pivalolactone with isoprene and/or butadiene. Also disclosed is a process for making copolymers comprising (1) polymerizing the diene with a lithium initiator and, optionally, metallating the resulting lithiopolydiene with an alkyllithium, (2) carboxylating the resulting polylithiopolydiene by reaction with carbon dioxide, (3) reacting the polymeric lithium carboxylate with tetraalkylammonium hydroxide or halide and (4) reacting the tetraalkylammonium salt with pivalolactone.
Inventors
- 👤 Robert Paul Foss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:23
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08C; C08C19/00; C08C19/30; C08C19/34; C08C19/36; C08C19/42; C08C19/44; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
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° C. and at least 2.0 at 250° C.
Claim 2
Dependent Claim
89 words
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° C. and at least 2.0 at 250° C.
Claim 3
Dependent Claim
20 words
A copolymer according to claim 1 wherein l and n are 15 to 200 and m is 100 to 5,000.
Claim 4
Dependent Claim
12 words
A copolymer according to claim 1 wherein the diene unit is isoprene.
Claim 5
Dependent Claim
12 words
A copolymer according to claim 1 wherein the diene unit is butadiene.
Claim 6
Dependent Claim
7 words
An exercised copolymer according to claim 1.
Claim 7
Dependent Claim
10 words
An article of manufacture comprising the copolymer of claim 1.
Claim 8
Dependent Claim
12 words
An article according to claim 6 in the form of a fiber.
Claim 9
Dependent Claim
12 words
An article according to claim 6 in the form of a film.
Claim 10
Dependent Claim
13 words
An aritcle according to claim 6 in the form of a molded object.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |