US3645979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for copolymerization of aromatic and aliphatic polyisocyanates to form polyisocyanurates
Assignee: Bayer AG
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Filing: 1967-01-25
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Granted: 1972-02-29
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Expires: 1987-01-25
Abstract
Abstract A METHOD FOR PREPARING POLYISOCYANATES HAVING AT LEAST ONE ISOCYANURATE RING WHICH COMPRISES POLYMERIZING AN AROMATIC AND AN ALPHATIC OR ARALIPHATIC POLYISOCYANATE IN THE PRESENCE OF AN ORGANIC PHOSPHINE, THE ALIPHATIC OR ARALIPHATIC POLYISOCYANATE BEING PRESENT IN SUCH AN AMOUNT THAT MORE THAN ABOUT 0.5 ALIPHATICALLY BOUND -NCO GROUP IS PRESENT PER AROMATICALLY BOUND-NCO GROUP, PREFERABLY 0.5 TO 10. THE PRODUCTS PER SE HAVE UTILITY AS ADHESIVES, LACQUERS, CASTING RESINS, AND FOAMS, AND ALSO AS THE ISOCYANATE COMPONENT IN OTHER REACTIVE SYSTEMS.
Inventors
- 👤 Dietrich Liebsch
- 👤 Wilhelm Altner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:39
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/795; B; B41; B41L; B41L11/00; C08G18/02; C08G18/022; B41P; B41P2700/00; B41P2700/10; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S528/00; Y10S528/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |