US4358571A
Expired / Lapsed
US
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Chemically modified imidazole curing catalysts for epoxy resin and powder coatings containing them
Assignee: Valspar Corp
•
Filing: 1981-03-10
•
Granted: 1982-11-09
•
Expires: 2001-03-10
Abstract
Abstract Imidazole or substituted imidazole is adducted with acrylate ester, an epoxy, or an isocyanate followed by neutralization with lower fatty acid or alkylene or aromatic dicarboxylic acid. The product is a curing agent which is combined with an epoxy resin to form a powder coating.
Inventors
- 👤 Marvin L. Kaufman
- 👤 George F. Salathe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:50
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/56; C07; C07D; C07D233/00; C07D233/54; C08G59/5093
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
68 words
Curing agent for epoxy resins that comprise an imidazole having the formula: ##STR5## wherein X is hydrogen, methyl, ethyl, or phenyl and Y and Z are hydrogen or methyl, modified by addition of C 1 -C 18 alkyl (meth) acrylate, by addition of a diglycidyl ether of a bisphenol, or a 1,2-monoepoxide or by carbamoylation; followed by neutralization with a lower fatty acid, or an aromatic mono-carboxylic acid.
Claim 2
Dependent Claim
68 words
Curing agent for epoxy resins that comprise an imidazole having the formula: ##STR5## wherein X is hydrogen, methyl, ethyl, or phenyl and Y and Z are hydrogen or methyl, modified by addition of C 1 -C 18 alkyl (meth) acrylate, by addition of a diglycidyl ether of a bisphenol, or a 1,2-monoepoxide or by carbamoylation; followed by neutralization with a lower fatty acid, or an aromatic mono-carboxylic acid.
Claim 3
Dependent Claim
11 words
The curing agent of claim 1 wherein said imidazole is 2-ethyl-4-methylimidazole.
Claim 4
Dependent Claim
11 words
The curing agent of claim 1 wherein said imidazole is 2-phenylimidazole.
Claim 5
Dependent Claim
11 words
The curing agent of claim 1 wherein said imidazole is imidazole.
Claim 6
Dependent Claim
18 words
The curing agent of claim 2 wherein modification is with 2-ethylhexyl acrylate and neutralization is with acetic acid.
Claim 7
Dependent Claim
18 words
The curing agent of claim 3 wherein modification is with 2-ethylhexyl acrylate and neutralization is with acetic acid.
Claim 8
Dependent Claim
29 words
The curing agent of claim 2 wherein modification is with a diglycidyl ether of bisphenol A having an epoxy equivalent weight of 450-550 and neutralization is with acetic acid.
Claim 9
Dependent Claim
22 words
The curing agent of claim 4 wherein modification is with a C 12 -C 14 monoepoxide and neutralization is with acetic acid.
Claim 10
Dependent Claim
13 words
The curing agent of claim 4 wherein modification is by carbamoylation with phenylisocyanate.
Claim 11
Dependent Claim
18 words
A thermosetting powder coating comprising at least one 1,2-epoxy resin and a curing agent defined in claim 1.
Claim 12
Dependent Claim
52 words
The powder coating of claim 10 wherein said 1,2-epoxy resin is a mixture of a diglycidyl ether of bisphenol A having an epoxy equivalent weight of 1105, a diglycidyl ether having epoxy equivalent weight of 660-810, and a C 12 -C 14 monoepoxide and said curing agent is defined in claim 5.
Claim 13
Dependent Claim
40 words
The powder coating of claim 10 wherein said 1,2-epoxy resin is a mixture of a diglycidyl ether having an epoxy equivalent weight of 1056 and a C 12 -C 14 monoepoxide and said curing agent is defined in claim 6.
Claim 14
Dependent Claim
38 words
The powder coating of claim 10 wherein said 1,2-epoxy resin is a mixture of diglycidyl ether having an epoxy equivalent weight 1055.7 and a C 12 -C 14 monoepoxide and said curing agent is defined in claim 7.
Claim 15
Dependent Claim
30 words
The powder coating of claim 10 wherein said 1,2-epoxy resin is a diglycidyl ether having an epoxy equivalent weight of 899.6 and said curing agent is defined in claim 1.
Claim 16
Dependent Claim
70 words
Curing agent for epoxy resins that consists essentially of an imidazole having the formula: ##STR6## wherein X is hydrogen, methyl, ethyl, or phenyl and Y and Z are hydrogen or methyl, modified by addition of C 1 -C 18 alkyl (meth) acrylate, by addition of a 1,2-monoepoxide or by carbamoylation; followed by neutralization with a lower fatty acid, a lower alkylene dicarboxylic acid, or an aromatic mono- or poly-carboxylic acid.
Claim 17
Dependent Claim
70 words
Curing agent for epoxy resins that consists essentially of an imidazole having the formula: ##STR6## wherein X is hydrogen, methyl, ethyl, or phenyl and Y and Z are hydrogen or methyl, modified by addition of C 1 -C 18 alkyl (meth) acrylate, by addition of a 1,2-monoepoxide or by carbamoylation; followed by neutralization with a lower fatty acid, a lower alkylene dicarboxylic acid, or an aromatic mono- or poly-carboxylic acid.
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |