US3687916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organoaluminum compounds as adjuvants in an organocalcium initiated polymerization of conjugated dienes and/or monovinyl aromatic compounds
Assignee: Phillips Petroleum Co
•
Filing: 1968-12-16
•
Granted: 1972-08-29
•
Expires: 1988-12-16
Abstract
Abstract Polymers are produced from conjugated dienes and monovinylsubstituted aromatic compounds by employing a polymerization initiator system of an organoaluminum adjuvant and an organocalcium initiator so as to unexpectedly improve and control the polymerization process.
Inventors
- 👤 Francis X Mueller Jr
- 👤 James D Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:37
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/36; C08F236/00; C08F236/02; C08F236/04; C08F236/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
The process of claim 1 wherein in said polymerization process said hydrocarbon diluent contains four to ten carbon atoms per molecule.
Claim 2
Dependent Claim
45 words
The process of claim 1 wherein the mole ratio of said organocalcium reaction product to said organoaluminum compound is about 0.3:1 to 10:1 and wherein the concentration of said organocalcium reaction product is about 2 to 20 gram millimoles per 100 grams of monomer(s) employed.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein said organocalcium reaction product is that of calcium with anthracene or with 9,10-dimethyl anthracene; and wherein said organoaluminum compound is triisobutylaluminum.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein said polymerizable conjugated diene is 1,3-butadiene and wherein said polymerizable monovinyl-substituted aromatic compound is styrene.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |