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US4132843A
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Blocked polyisocyanates formed from hexamethylene-1,6-diisocyanate and acetoacetic acid C3 -C5 alkyl esters
Assignee: Hoechst AG
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Filing: 1977-03-18
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Granted: 1979-01-02
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Expires: 1997-03-18
Abstract
Abstract The invention relates to completely or partially blocked diisocyanates.
Inventors
- 👤 Horst Dalibor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8093
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
Process for the manufacture of a blocked diisocyanate of the formula ##STR5## wherein R denotes an n-propyl, isopropyl, n-butyl, tert.-butyl, isobutyl, sec.-butyl or pentyl radical, characterised in that an acetoacetic acid alkyl ester in which the alkyl radical is R, is reacted with hexamethylene-1,6-diisocyanate in a molar ratio of 2.0 to 2.1:1, by warming in the presence of a catalyst.
Claim 2
Dependent Claim
60 words
Process for the manufacture of a blocked diisocyanate of the formula ##STR5## wherein R denotes an n-propyl, isopropyl, n-butyl, tert.-butyl, isobutyl, sec.-butyl or pentyl radical, characterised in that an acetoacetic acid alkyl ester in which the alkyl radical is R, is reacted with hexamethylene-1,6-diisocyanate in a molar ratio of 2.0 to 2.1:1, by warming in the presence of a catalyst.
Claim 3
Dependent Claim
61 words
Process for the manufacture of a partially blocked diisocyanate of the formula ##STR6## wherein R denotes an n-propyl, isopropyl, n-butyl, tert.-butyl, isobutyl, sec.-butyl or pentyl radical, characterised in that an acetoacetic acid alkyl ester in which the alkyl radical is R, is reacted with hexamethylene-1,6-diisocyanate in a molar ratio of 1.0 to 1.05:1, by warming in the presence of a catalyst.
Claim 4
Dependent Claim
61 words
Process for the manufacture of a partially blocked diisocyanate of the formula ##STR6## wherein R denotes an n-propyl, isopropyl, n-butyl, tert.-butyl, isobutyl, sec.-butyl or pentyl radical, characterised in that an acetoacetic acid alkyl ester in which the alkyl radical is R, is reacted with hexamethylene-1,6-diisocyanate in a molar ratio of 1.0 to 1.05:1, by warming in the presence of a catalyst.
Claim 5
Dependent Claim
70 words
Process according to claim 2, characterised in that the hexamethylene-1,6-diisocyanate and the catalyst are warmed to about 60 to 90° C. in the reaction vessel and the required quantity of acetoacetic acid alkyl ester is added gradually in the course of 1 to 3 hours while maintaining the said temperature and the mixture is then kept at the reaction temperature until the reaction product of claim 2 has been obtained.
Claim 6
Dependent Claim
40 words
Method which comprises crosslinking polymers containing hydroxy groups with a blocked diisocyanate of the formula ##STR7## wherein R 1 donates the radical ##STR8## n-propyl, isopropyl, n-butyl, tert.-butyl, isobutyl, sec.-butyl, or pentyl radical at a temperature of 80 to 130° C.
Claim 7
Dependent Claim
40 words
Method which comprises crosslinking polymers containing hydroxy groups with a blocked diisocyanate of the formula ##STR7## wherein R 1 donates the radical ##STR8## n-propyl, isopropyl, n-butyl, tert.-butyl, isobutyl, sec.-butyl, or pentyl radical at a temperature of 80 to 130° C.
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) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |