Patent US5235277A successfully refreshed from Google Patents.
Patent US4145493A successfully refreshed from Google Patents.
US4145493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of rubbery polymeric hydrocarbons
Assignee: Ethyl Corp
•
Filing: 1977-12-01
•
Granted: 1979-03-20
•
Expires: 1997-12-01
Abstract
Abstract Continuous oxidation of rubbery polymeric hyrocarbons by mixing an oxygen-containing gas and a hot solution of the polymer in an oleaginous solvent at the inlet to a spraying device and spraying the mixture into a hot chamber provides substantially instantaneous oxidation of the polymer and disengagement of gas and liquid and at least the same extent of oxidation as the time consuming oxidation accomplished by sparging such gas into a volume of stirred hot solution.
Inventors
- 👤 Dennis G. Petrille
- 👤 George S. Culbertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:36
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; B; B29; B29C; B29C48/00; B29C48/25; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92514; B29C2948/92704; B29C48/022; B29C48/78; B29C48/80; B29C48/802; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
A method of oxidative molecular weight degradating an ethylene-propylene copolymer of average number molecular weight in the range of from 10,000 up to 40,000 and introducing into the resulting lower molecular weight molecule entities a plurality of keto-carbonyl groups which comprises heating a solution of from 5 up to 13 weight percent of said copolymer in an oleaginous solvent to a temperature in the range of from 160° C. up to 215° C., adding to said heated solution a gas containing molecular oxygen in the aspirating or suction side of a means for spraying fluids, spraying such mixture into a chamber maintained at a temperature of from 160° C. up to 215° C. to disengage oxygen depleted gas from the resulting solution and recovering the gas-free solution.
Claim 2
Independent Claim
127 words
A method of oxidative molecular weight degradating an ethylene-propylene copolymer of average number molecular weight in the range of from 10,000 up to 40,000 and introducing into the resulting lower molecular weight molecule entities a plurality of keto-carbonyl groups which comprises heating a solution of from 5 up to 13 weight percent of said copolymer in an oleaginous solvent to a temperature in the range of from 160° C. up to 215° C., adding to said heated solution a gas containing molecular oxygen in the aspirating or suction side of a means for spraying fluids, spraying such mixture into a chamber maintained at a temperature of from 160° C. up to 215° C. to disengage oxygen depleted gas from the resulting solution and recovering the gas-free solution.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein the spray discharge is of a pattern such that all or substantially all of the spray droplets do not contact the inner walls of the spray receiving chamber.
References Cited (Backward Citations)
US3350362A
Cited
US3329667A
Cited
US3434993A
Cited
US3655834A
Cited
US3756999A
Cited
US3756954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |