Patent US3907933A successfully refreshed from Google Patents.
US3907933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of pivalolactone and isoprene or butadiene
Assignee: EIDP Inc
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Filing: 1973-11-06
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Granted: 1975-09-23
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Expires: 1993-11-06
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
2026-11-04 12:44
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
13 words
A COPOLYMER DERIVED FROM PIVALOLACTONE AND A DIENE SELECTED FROM ISOPRENE AND BUTADIENE,
Claim 2
Dependent Claim
13 words
A COPOLYMER DERIVED FROM PIVALOLACTONE AND A DIENE SELECTED FROM ISOPRENE AND BUTADIENE,
Claim 3
Dependent Claim
28 words
A copolymer according to claim 1, wherein 1 and k are between 15 to 200, m is between 100 to 5,000 and x is between 1 to 50.
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
16 words
A process for making the copolymer of claim 1, comprising exercising the copolymer of claim 1.
Claim 8
Dependent Claim
9 words
An article of manufacture comprising the copolymer of claim
Claim 9
Dependent Claim
12 words
An article according to claim 7 in the form of a fiber.
Claim 10
Dependent Claim
12 words
An article according to claim 7 in the form of a film.
Claim 11
Dependent Claim
13 words
An article according to claim 7 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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |