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US3941753A
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Prepolymers of polyisocyanates with hydroxy-enamines or hydroxy-ketimines
Assignee: Lanxess Organometallics GmbH
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Filing: 1974-11-01
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Granted: 1976-03-02
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Expires: 1994-11-01
Abstract
Abstract Prepolymers having enamine or ketimine groups therein are prepared by reacting a polyisocyanate with a mono-enamine or mono-ketimine having an hydroxy group. The prepolymers may be used as mixtures with further isocyanate, which mixtures harden in the presence of water or atmospheric moisture and are useful as lacquers, casting and patching resins, and for coatings and laminates.
Inventors
- 👤 Bernd Brinkmann
- 👤 Eugen Griebsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:50
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C07; C07C; C07C271/00; C07C271/06; C07C271/08; C07C271/24; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/08; C07D211/10; C07D211/14; C07D241/00; C07D241/02; C07D241/04; C07D295/00; C07D295/02; C07D295/027; C07D295/033; C07D295/04; C07D295/08; C07D295/084; C07D295/088; C07D295/12; C07D295/125; C07D295/13; C08G18/08; C08G18/10; C08G18/30; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3256; C08G18/3271; C08G18/3293; C08G18/3296; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A prepolymer, free of isocyanate groups and containing an enamine or ketimine group, prepared by reacting a polyisocyanate and an enamine or ketimine having at least one hydroxy group in an amount such that the ratio NCO/OH is 1.
Claim 2
Dependent Claim
39 words
A prepolymer, free of isocyanate groups and containing an enamine or ketimine group, prepared by reacting a polyisocyanate and an enamine or ketimine having at least one hydroxy group in an amount such that the ratio NCO/OH is 1.
Claim 3
Dependent Claim
13 words
A prepolymer as in claim 1 wherein said polyisocyanate is an aliphatic polyisocyanate.
Claim 4
Dependent Claim
23 words
A prepolymer as in claim 1 wherein said polyisocyanate is a pre-adduct prepared by the reaction of a polypropylene glycol with excess diisocyanate.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |