US3226375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of emulsion polymerization
Assignee: Zeneca Inc
•
Filing: 1961-07-11
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Granted: 1965-12-28
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Expires: 1981-07-11
Abstract
No abstract record available.
Inventors
- 👤 Gerald G Greth
- 👤 Joseph E Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F2/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN AN EMULSION POLYMERIZATION PROCESS COMPRISING POLYMERIZING A VINYL MONOMER IN AN AQUEOUS MEDIUM CONTAINING OF A VINYL MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL ACETATE AND STYRENE, WATER AND A FREE RADICAL POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE AQUEOUS MEDIUM AN ANIONIC EMULSIFIER CONSISTING ESSENTIALLY OF A LOWER ALKYLAMINE SALT OF AN ALKYL ARYL SULFONIC ACID AND A NONIONIC EMULSIFIER CONSISTING ESSENTIALLY OF POLYOXYETHYLENE COMPOUND, SAID EMULSIFIERS HAVING A COMBINED HLB VALUE RANGING FROM ABOUT 7 TO ABOUT 20 AND SAID ANIONIC EMULSIFIER PLUS NONIONIC EMULSIFIER AMOUNTING TO FROM ABOUT 0.5 TO ABOUT 5 WEIGHT PERCENT OF THE AQUEOUS MEDIUM.
Claim 2
Dependent Claim
105 words
IN AN EMULSION POLYMERIZATION PROCESS COMPRISING POLYMERIZING A VINYL MONOMER IN AN AQUEOUS MEDIUM CONTAINING OF A VINYL MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL ACETATE AND STYRENE, WATER AND A FREE RADICAL POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE AQUEOUS MEDIUM AN ANIONIC EMULSIFIER CONSISTING ESSENTIALLY OF A LOWER ALKYLAMINE SALT OF AN ALKYL ARYL SULFONIC ACID AND A NONIONIC EMULSIFIER CONSISTING ESSENTIALLY OF POLYOXYETHYLENE COMPOUND, SAID EMULSIFIERS HAVING A COMBINED HLB VALUE RANGING FROM ABOUT 7 TO ABOUT 20 AND SAID ANIONIC EMULSIFIER PLUS NONIONIC EMULSIFIER AMOUNTING TO FROM ABOUT 0.5 TO ABOUT 5 WEIGHT PERCENT OF THE AQUEOUS MEDIUM.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |