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US2777832A
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Continuous process for the polymerization of acrylonitrile
Assignee: Wyeth Holdings LLC
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Filing: 1951-05-22
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Granted: 1957-01-15
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Expires: 1971-05-22
Abstract
No abstract record available.
Inventors
- 👤 Mallison William Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:31
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/12; C08F2/16; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR PRODUCING A POLYMER WHICH COMPRISES CONTINUOUSLY FEEDING, FOR POLYMERIZATION, ACRYLONITRILE WITH UP TO ABOUT 15% BY WEIGHT OF A DIFFERENT MONOETHYLENICALLY UNSATURATED COMPOUND, COPOLYMERIZABLE THEREWITH, INTO AN AGITATED POLYMERIZATION ZONE, SAID POLYMERIZATION OCCURING IN THE PRESENCE OF A POLYMERIZATION CATALYST, SAID ZONE BEING AN AQUEOUS POLYMER SUSPENSION HAVING A MONOMER CONCENTRATION OF FROM ABOUT 1 TO 10% AND A SUBSTANTIALLY CONSTANT QUANTITY OF POLYMER IN THE FORM OF COMPACT ROUNDED QUANTITY PARTICLES, SAID QUANTITY BEING AN AMOUNT OF FROM ABOUT 19 TO 40% OF THE WEIGHT OF THE SUSPENSION, SAID ZONE BEING MAINTAINED UNDER SUBSTANTIALLY STEADY STATE CONDITIONS, INCLUDING A SUBSTANTIALLY CONSTANT TEMPERATURE WITHIN THE RANGE OF ABOUT 20*C. TO 70*C., THE CONCENTRATION OF MONOMER IN THE FEED BEING SUCH AS TO MAINTAIN THE AMOUNT OF MONOMER AND POLYMER IN THE POLYMERIZATION ZONE SUBSTANTIALLY CONSTANT.
Claim 2
Dependent Claim
138 words
A PROCESS FOR PRODUCING A POLYMER WHICH COMPRISES CONTINUOUSLY FEEDING, FOR POLYMERIZATION, ACRYLONITRILE WITH UP TO ABOUT 15% BY WEIGHT OF A DIFFERENT MONOETHYLENICALLY UNSATURATED COMPOUND, COPOLYMERIZABLE THEREWITH, INTO AN AGITATED POLYMERIZATION ZONE, SAID POLYMERIZATION OCCURING IN THE PRESENCE OF A POLYMERIZATION CATALYST, SAID ZONE BEING AN AQUEOUS POLYMER SUSPENSION HAVING A MONOMER CONCENTRATION OF FROM ABOUT 1 TO 10% AND A SUBSTANTIALLY CONSTANT QUANTITY OF POLYMER IN THE FORM OF COMPACT ROUNDED QUANTITY PARTICLES, SAID QUANTITY BEING AN AMOUNT OF FROM ABOUT 19 TO 40% OF THE WEIGHT OF THE SUSPENSION, SAID ZONE BEING MAINTAINED UNDER SUBSTANTIALLY STEADY STATE CONDITIONS, INCLUDING A SUBSTANTIALLY CONSTANT TEMPERATURE WITHIN THE RANGE OF ABOUT 20*C. TO 70*C., THE CONCENTRATION OF MONOMER IN THE FEED BEING SUCH AS TO MAINTAIN THE AMOUNT OF MONOMER AND POLYMER IN THE POLYMERIZATION ZONE SUBSTANTIALLY CONSTANT.
References Cited (Backward Citations)
US2436926A
Cited
US2475016A
Cited
US2496384A
Cited
US2546238A
Cited
US2496222A
Cited
US2628223A
Cited
US2531403A
Cited
US2560694A
Cited
US2654731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |