US3346631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid carboxylated polymers and method of preparing the same
Assignee: American Synthetic Rubber Corp
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Filing: 1963-10-29
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Granted: 1967-10-10
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Expires: 1983-10-29
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Boyer
- 👤 Richard C Chang
- 👤 Edward L Ries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:28
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR THE PREPARATION OF CARBOXY TERMINATED LIQUID BUTADIENE POLYMER COMPRISING DISSOLVING A HIGH MOLECULAR WEIGHT BUTADIENE POLYMER IN AN INERT SOLVENT THEREFOR, CONTACTING THE RESULTING SOLUTION WITH A GAS CONTAINING OZONE, SAID OZONE BEING PRESENT IN AN AMOUNT OF LESS THAN 0.5% BY WEIGHT OF THE TOTAL GAS, AND IN AT LEAST A SUUFFICIENT AMOUNT TO OBTAIN THE DESIRED POLYMER VISCOSITY AT A TEMPERATURE IN THE RANGE BETWEEN -80*C. AND 150*C., STOPPING THE FLOW OF OZONE WHEN THE DESIRED POLYMER VISCOSITY IN THE RANGE OF 0.1 TO 10,000,000 POISES AT 25*C. HAS BEEN REACHED, REMOVING THE SOLVENT AND RECOVERING THE CARBOXYLATED LIQUID BUTADIENE POLYMER, THE POLYMER VISCOSITY BEING DETERMINED BY ISOLATING SAMPLES DURING THE REACTION AND MEASURING THE VISCOSITY.
Claim 2
Dependent Claim
121 words
A PROCESS FOR THE PREPARATION OF CARBOXY TERMINATED LIQUID BUTADIENE POLYMER COMPRISING DISSOLVING A HIGH MOLECULAR WEIGHT BUTADIENE POLYMER IN AN INERT SOLVENT THEREFOR, CONTACTING THE RESULTING SOLUTION WITH A GAS CONTAINING OZONE, SAID OZONE BEING PRESENT IN AN AMOUNT OF LESS THAN 0.5% BY WEIGHT OF THE TOTAL GAS, AND IN AT LEAST A SUUFFICIENT AMOUNT TO OBTAIN THE DESIRED POLYMER VISCOSITY AT A TEMPERATURE IN THE RANGE BETWEEN -80*C. AND 150*C., STOPPING THE FLOW OF OZONE WHEN THE DESIRED POLYMER VISCOSITY IN THE RANGE OF 0.1 TO 10,000,000 POISES AT 25*C. HAS BEEN REACHED, REMOVING THE SOLVENT AND RECOVERING THE CARBOXYLATED LIQUID BUTADIENE POLYMER, THE POLYMER VISCOSITY BEING DETERMINED BY ISOLATING SAMPLES DURING THE REACTION AND MEASURING THE VISCOSITY.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |