US3243419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In situ generation of suspending agent in the suspension polymerization of styrene
Assignee: Atlantic Richfield Co
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Filing: 1961-10-30
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Granted: 1966-03-29
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Expires: 1981-10-30
Abstract
No abstract record available.
Inventors
- 👤 Alvin R Ingram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:02
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN THE SUSPENSION POLYMERIZATION OF STYRENE, TO FORM A SUBSTANTIAL HOMOPOLYMER OF STYRENE THE IMPROVEMENT COMPRISING: GENERATING THE SOLE SUSPENDING AGENT IN SITU DURING THE POLYMERIZATION BY ADDING TO AN AQUEOUS DISPERSION OF SAID STYRENE A FREE RADICAL POLYMERIZATION INITIATOR, AND A MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE AND METHACRYLAMIDE SAID MONOMER BEING PRESENT IN AN AMOUNT TO GIVE A STYRENE TO MONOMER RATIO OF ABOUT 9:1 BY WEIGHT TO THEREBY FORM A POLYMER OF SAID MONOMER WHICH POLYMER IS A SUSPENDING AGENT FOR SAID STYRENE, INITIATING POLYMERIZATION OF SAID STYRENE BY HEATING SAID DISPERSION AND CONTINUING POLYMERIZATION TO SUBSTANTIAL COMPLETENESS.
Claim 2
Dependent Claim
103 words
IN THE SUSPENSION POLYMERIZATION OF STYRENE, TO FORM A SUBSTANTIAL HOMOPOLYMER OF STYRENE THE IMPROVEMENT COMPRISING: GENERATING THE SOLE SUSPENDING AGENT IN SITU DURING THE POLYMERIZATION BY ADDING TO AN AQUEOUS DISPERSION OF SAID STYRENE A FREE RADICAL POLYMERIZATION INITIATOR, AND A MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE AND METHACRYLAMIDE SAID MONOMER BEING PRESENT IN AN AMOUNT TO GIVE A STYRENE TO MONOMER RATIO OF ABOUT 9:1 BY WEIGHT TO THEREBY FORM A POLYMER OF SAID MONOMER WHICH POLYMER IS A SUSPENDING AGENT FOR SAID STYRENE, INITIATING POLYMERIZATION OF SAID STYRENE BY HEATING SAID DISPERSION AND CONTINUING POLYMERIZATION TO SUBSTANTIAL COMPLETENESS.
References Cited (Backward Citations)
GB546459A
Cited
US3108979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |