Patent US3294724A successfully refreshed from Google Patents.
US3294724A
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Film-forming urethane latices, and preparation by chain extending a prepolymer of anorganic dhsocyanate and a polymeric diol with a piperazine compound
Assignee: Wyandotte Chemicals Corp
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Filing: 1964-11-23
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Granted: 1966-12-27
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Expires: 1984-11-23
Abstract
No abstract record available.
Inventors
- 👤 Seymour L Axelrood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:19
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/08; C08G18/10; C08G18/4825
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS FOR THE PREPARATION OF FILM-FORMING URETHANE LATICES WHICH COMPRISES CHAIN EXTENDING IN THE PRESENCE OF WATER A LINEAR POLYURETHANE PREPOLYMER PREPARED BY THE REACTION, IN AN ORGANIC DIISOCYANATE WITH A OF FROM 1.33:1 TO 2:1, OF AN ORGANIC DIISOCYANATE WITH A POLYMERIC DIOL CONTAINING A BRANCHED POLYOXYALKYLENE CHAIN AND HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 400 TO ABOUT 1500, WITH FROM ABOUT 0.8 TO ABOUT 1.2 EQUIVALENTS, FOR EACH ISOCYNATE EQUIVALENT OF SAID POLYURETHANE PREPOLYMER, OF A PIPERAZINE COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
86 words
A PROCESS FOR THE PREPARATION OF FILM-FORMING URETHANE LATICES WHICH COMPRISES CHAIN EXTENDING IN THE PRESENCE OF WATER A LINEAR POLYURETHANE PREPOLYMER PREPARED BY THE REACTION, IN AN ORGANIC DIISOCYANATE WITH A OF FROM 1.33:1 TO 2:1, OF AN ORGANIC DIISOCYANATE WITH A POLYMERIC DIOL CONTAINING A BRANCHED POLYOXYALKYLENE CHAIN AND HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 400 TO ABOUT 1500, WITH FROM ABOUT 0.8 TO ABOUT 1.2 EQUIVALENTS, FOR EACH ISOCYNATE EQUIVALENT OF SAID POLYURETHANE PREPOLYMER, OF A PIPERAZINE COMPOUND HAVING THE FORMULA:
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |