US4031300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight, high unsaturation isobutylene-cyclopentadiene copolymers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-11-13
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Granted: 1977-06-21
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Expires: 1995-11-13
Abstract
Abstract Substantially gel-free, high molecular weight, high unsaturation copolymers of isobutylene and cyclopentadiene having a number average molecular weight of at least 90,000 and a mole percent of unsaturation of at least 5% and the process for preparing said polymers which comprises carrying out the polymerization in a homogeneous phase, introducing to the system either an aluminum halide in a soluble form or a hydrocarbylaluminum dihalide and carrying the reaction out at a temperature of less than about -100 DEG C.
Inventors
- 👤 Warren A. Thaler
- 👤 Donald J. Buckley
- 👤 Joseph P. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:15
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/10; C08F210/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
34 words
A substantially gel-free copolymer consisting of a major portion of isobutylene and about 5 to about 40 mol % of cyclopentadiene, said copolymers having a number average molecular weight of about 90,000 to 120,000.
Claim 2
Dependent Claim
34 words
A substantially gel-free copolymer consisting of a major portion of isobutylene and about 5 to about 40 mol % of cyclopentadiene, said copolymers having a number average molecular weight of about 90,000 to 120,000.
Claim 3
Dependent Claim
17 words
The copolymer of claim 1 wherein the mole % of cyclopentadiene is about 8 to about 35%.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |