US2927104A
Expired / Lapsed
US
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Preparation of high molecular weight polyisobutylene
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1957-12-18
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Granted: 1960-03-01
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Expires: 1977-12-18
Abstract
No abstract record available.
Inventors
- 👤 Augustus B Small
- 👤 John L Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:13
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
PROCESS FOR PREPARING POLYISOBUTYLENE HAVING A STAUDINGER MOLECULAR WEIGHT OF ABOUT 180,000 TO 350,000 WHICH COMPRISES CONTINUOUSLY POLYMERIZING POISON-FREE ISOBUTYLENE AT A TEMPERATURE OF BETWEEN ABOUT - 100* AND - 150*C. IN THE PRESENCE OF AN ALKYL HALIDE SOLUTION CONTAINING 1 TO 2 CARBON ATOMS AND CONTAINING ABOUT 0.001 TO 0.004 WEIGHT PERCENT BASED ON ALKYL HALIDE OF AN ALUMINUM HALIDE CATALYST DISSOLVED THEREIN, AND TERMINATING THE POLYMERIZATION AT A CONVERSION LEVEL OF BETWEEN ABOUT 50% AND 70%? SAID ALKYL HALIDE BEING A NON-SOLVENT FOR THE HIGH MOLECULAR WEIGHT POLYISOBUTYLENE FORMED.
Claim 2
Dependent Claim
91 words
PROCESS FOR PREPARING POLYISOBUTYLENE HAVING A STAUDINGER MOLECULAR WEIGHT OF ABOUT 180,000 TO 350,000 WHICH COMPRISES CONTINUOUSLY POLYMERIZING POISON-FREE ISOBUTYLENE AT A TEMPERATURE OF BETWEEN ABOUT - 100* AND - 150*C. IN THE PRESENCE OF AN ALKYL HALIDE SOLUTION CONTAINING 1 TO 2 CARBON ATOMS AND CONTAINING ABOUT 0.001 TO 0.004 WEIGHT PERCENT BASED ON ALKYL HALIDE OF AN ALUMINUM HALIDE CATALYST DISSOLVED THEREIN, AND TERMINATING THE POLYMERIZATION AT A CONVERSION LEVEL OF BETWEEN ABOUT 50% AND 70%? SAID ALKYL HALIDE BEING A NON-SOLVENT FOR THE HIGH MOLECULAR WEIGHT POLYISOBUTYLENE FORMED.
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) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |