US3640966A
Expired / Lapsed
US
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Process for the preparation of polyisocyanates which contain a carbodiimide-isocyanate adduct
Assignee: Bayer AG
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Filing: 1969-01-23
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Granted: 1972-02-08
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Expires: 1989-01-23
Abstract
Abstract POLYISOCYANATES CONTAINING A CARBODIIMIDE-ISOCYANATE ADDUCT ARE PREPARED BY HEATING AN ORGANIC POLYISOCYANATE CONTAINING NITROGEN ATOMS ONLY IN THE ISOCYANATO GROUPS IN THE PRESENCE OF A CATALYTIC AMOUNT OF A CATALYST TO A TEMPERATURE ABOVE 150*C. AND COOLING THE REACTION PRODUCT TO ABOUT ROOM TEMPERATURE, WHEREIN SAID CATALYST IS AN ORGANIC ISOCYANATE COMPOUND CONTAINING BIURET, UREA, AMIDO, URETHANE, ALLOPHANATE, ISOCYANURATE, URETDIONE OR URETONIMINE GROUPS IN THE COMPOUND.
Inventors
- 👤 Hans Joachim Hennig
- 👤 Peter Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:38
CPC Classifications
C; C07; C07D; C07D229/00; C08; C08G; C08G18/00; C08G18/02; C08G18/025; C08G18/06; C08G18/08; C08G18/09; C08G18/095; Y; Y10; Y10S; Y10S521/00; Y10S521/901
Claims Analysis
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |