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US4590009A
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Stabilized polyisocyanates partially blocked with hydroxy amines
Assignee: Allnex Austria GmbH
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Filing: 1985-04-29
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Granted: 1986-05-20
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Expires: 2005-04-29
Abstract
Abstract Hydrazine is utilized for preventing side reactions during the preparation and storage of polyisocyanates partially blocked with hydroxy amines which are utilized for the introduction of basic functional groups into organic coating compositions which are deposited cathodically in an electrodeposition process. The inhibiting compound is used in the form of hydrazine hydrate at a level of from about 50 to 5000 ppm calculated on the amine used in the reaction.
Inventors
- 👤 Georg Pampouchidis
- 👤 Herbert Deu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/807; C09; C09D; C09D5/00; C09D5/44; C09D5/4419; C09D5/4465
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
The method of reducing side reactions during the preparation and during storage of a compound having one free isocyanate group and obtained by reacting a member of the group consisting of aromatic, aliphatic, and cycloaliphatic polyisocyanates and mixtures thereof, and an amine of the general formula ##STR3## wherein R is an alkanol or hydroxyphenyl radical, and R 1 and R 2 are alkyl, aryl or cycloalkyl radicals by the addition of from about 50 to 5000 ppm of hydrazine hydrate based on the said reacting amine.
Claim 2
Independent Claim
86 words
The method of reducing side reactions during the preparation and during storage of a compound having one free isocyanate group and obtained by reacting a member of the group consisting of aromatic, aliphatic, and cycloaliphatic polyisocyanates and mixtures thereof, and an amine of the general formula ##STR3## wherein R is an alkanol or hydroxyphenyl radical, and R 1 and R 2 are alkyl, aryl or cycloalkyl radicals by the addition of from about 50 to 5000 ppm of hydrazine hydrate based on the said reacting amine.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said hydrazine hydrate is present in an amount of from 100 to 2000 ppm based on the reacting amine.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said hydrazine hydrate is mixed with said amine prior to the reaction with said polyisocyanate.
Claim 5
Dependent Claim
7 words
The reaction product according to claim 1.
Claim 6
Dependent Claim
7 words
The reaction product according to claim 2.
Claim 7
Dependent Claim
7 words
The reaction product according to claim 3.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |