US3901959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric materials
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1974-01-14
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Granted: 1975-08-26
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Expires: 1994-01-14
Abstract
Abstract A process for the manufacture of cellular polyurethanes which comprises intimately mixing: A. A PREPOLYMER PREPARED BY THE REACTION OF A POLYESTER POLYOL WITH AN EXCESS OF A POLYISOCYANATE COMPRISING DIPHENYLMETHANE DIISOCYANATE, AND B. A MIXTURE CONTAINING A POLYETHER POLYOL, BLOWING AGENT, CATALYST AND SURFACE ACTIVE AGENT, THE RATIO OF ISOCYANATE GROUPS IN COMPONENT (A) TO ACTIVE HYDROGEN ATOMS IN COMPONENT (B) BEING SUBSTANTIALLY WITHIN THE RANGE OF 0.95:1 TO 1.2:1.
Inventors
- 👤 Dennis Charlton Allport
- 👤 Graham Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:36
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0058; C08G2110/0066; C08G2110/0083; C08G2410/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A PROCESS FOR THE MANUFACTURE OF CELLULAR POLYURETHANES WHICH COMPRISES INTIMATELY MIXING: A. A PREPOLYMER HAVING AN NCO CONTENT OF 15-21% BY WEIGHT PREPARED BY THE REACTION OF A POLYESTER POLYOL HAVING FROM THE TWO TO FOUR HYDROXYL GROUPS PER MOLECULE AND A HYDROXYL NUMBER OF FROM 50 TO 60 WITH AN EXCESS OF DIPHENYLMETHANE DIISOCYANATE, AND B. A MIXTURE CONTAINING A POLYOXYPROPYLENE OR POLY(OXYPROPYLENE-OXYETHYLENE)POLYOL HAVING FROM TWO TO FOUR HYDROXYL GROUPS PER MOLECULE AND A HYDROXYL NUMBER OF FROM 30 TO 60, 18.5 TO 28%, BASED ON THE WEIGHT OF SAID MIXTURE OF 1,4-BUTANEDIOL, A BLOWING AGENT, A CATALYST AND A SURFACE ACTIVE AGENT, THE RATIO OF ISOCYANATE GROUPS IN COMPONENT (A) TO ACTIVE HYDROGEN ATOMS IN COMPONENT (B) BEING SUBSTANTIALLY WITHIN THE RANGE OF 0.95:1 TO 1.2:1, INTRODUCING INTO A CLOSED MOLD A QUANTITY OF THE RESULTANT MIXTURE SUFFICIENT TO PRODUCE A CELLULAR POLYURETHANE WHOSE VOLUME IS AT LEAST 1.1 TIMES THE VOLUME OF THE MOLD IF SAID QUANITY WERE ALLOWED TO REACT AND RISE FREELY, AND FOAMING SAID MIXTURE IN SAID CLOSED MOLD.
Claim 2
Dependent Claim
176 words
A PROCESS FOR THE MANUFACTURE OF CELLULAR POLYURETHANES WHICH COMPRISES INTIMATELY MIXING: A. A PREPOLYMER HAVING AN NCO CONTENT OF 15-21% BY WEIGHT PREPARED BY THE REACTION OF A POLYESTER POLYOL HAVING FROM THE TWO TO FOUR HYDROXYL GROUPS PER MOLECULE AND A HYDROXYL NUMBER OF FROM 50 TO 60 WITH AN EXCESS OF DIPHENYLMETHANE DIISOCYANATE, AND B. A MIXTURE CONTAINING A POLYOXYPROPYLENE OR POLY(OXYPROPYLENE-OXYETHYLENE)POLYOL HAVING FROM TWO TO FOUR HYDROXYL GROUPS PER MOLECULE AND A HYDROXYL NUMBER OF FROM 30 TO 60, 18.5 TO 28%, BASED ON THE WEIGHT OF SAID MIXTURE OF 1,4-BUTANEDIOL, A BLOWING AGENT, A CATALYST AND A SURFACE ACTIVE AGENT, THE RATIO OF ISOCYANATE GROUPS IN COMPONENT (A) TO ACTIVE HYDROGEN ATOMS IN COMPONENT (B) BEING SUBSTANTIALLY WITHIN THE RANGE OF 0.95:1 TO 1.2:1, INTRODUCING INTO A CLOSED MOLD A QUANTITY OF THE RESULTANT MIXTURE SUFFICIENT TO PRODUCE A CELLULAR POLYURETHANE WHOSE VOLUME IS AT LEAST 1.1 TIMES THE VOLUME OF THE MOLD IF SAID QUANITY WERE ALLOWED TO REACT AND RISE FREELY, AND FOAMING SAID MIXTURE IN SAID CLOSED MOLD.
References Cited (Backward Citations)
US3186971A
Cited
US3591561A
Cited
US3591532A
Cited
US3666724A
Cited
US3674721A
Cited
US3661811A
Cited
US3856716A
Cited
US3853795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |