Patent US3708440A successfully refreshed from Google Patents.
US3708440A
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Reclaiming scrap polyisocyanurate foam with an aliphatic diol and a dialkanolamine
Assignee: Pharmacia and Upjohn Co
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Filing: 1972-02-14
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Granted: 1973-01-02
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Expires: 1992-02-14
Abstract
Abstract A PROCESS IS DISCLOSED FOR CONVERTING SCRAP POLYISOCYANURATE FOAM INTO A POLYOL WHICH CAN BE USED, WITHOUT THE NEED FOR ANY FURTHER TREATMENT, AS THE POLYOL COMPONENT IN THE PREPARATION OF POLYURETHANE AND RELATED FOAMS. THE PROCESS COMPRISES HEATING THE SCRAP AT ABOUT 175* C. TO ABOUT 250* C. IN THE PRESENCE OF A MIXTURE OF (A) AN ALIPHATIC DIOL HAVING FROM 2 TO 6 CARBON ATOMS, INCLUSIVE, AND A BOILING POINT ABOVE ABOUT 180* C. AND (B) A DIALKANOLAMINE HAVING FROM 4 TO 8 CARBON ATOMS, INCLUSIVE, THE DIALKANOLAMINE CONSTITUTING FROM ABOUT 2 PERCENT TO ABOUT 20 PERCENT BY WEIGHT OF THE MIXTURE.
Inventors
- 👤 F Frulla
- 👤 A Odinak
- 👤 A Sayigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:23
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/18; C08J11/22; C08J11/24; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1808; C08G18/1825; C08G18/1858; C08G18/28; C08G18/30; C08G18/38; C08G18/3878; C08G18/40; C08G18/42; C08G18/46; C08G18/4607; C08G18/4615; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/6677; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/147; C08G2101/00; C08G2110/00; C08G2110/0025; C08G2115/00; C08G2115/02; C08J2201/00; C08J2201/02; C08J2201/022; C08J2203/00; C08J2203/14; C08J2203/142; C08J2203/144; C08J2375/00; C08J2375/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 0
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |