Patent US3975314A successfully refreshed from Google Patents.
US3975314A
Expired / Lapsed
US
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Stannous salt catalyzed epoxy systems
Assignee: DeSoto Inc
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Filing: 1974-10-10
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Granted: 1976-08-17
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Expires: 1994-10-10
Abstract
Abstract Epoxy resin-based coating systems of high solids content and possessing an entended working period are provided using a fluid mixture of cyclohexene oxide moiety-containing polyepoxide, in admixture with a carboxyl functional material, especially a resin, and a stannous salt such as stannous chloride as catalyst. These systems cure well on baking, even at low baking temperatures.
Inventors
- 👤 Rostyslaw R. Smyk
- 👤 Rafat T. Rabi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:24
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
106 words
A rapid curing oxidizable epoxy resin-based coating composition of high solids content and possessing an extended working period comprising consisting essentially of a fluid mixture of a cyclohexene oxide moiety containing polyepoxide component having a 1,2 epoxy equivalency of at least 1.2, a carboxyl functional material reactive with said polyepoxide to cure the same, from 5-25% by weight of nonreactive organic solvent, and from 0.1-2.0% of stannous chloride as catalyst, based on the total weight of materials subjected to cure, the ratio of polyepoxide component to carboxyl functional material providing a ratio of equivalents of oxirane to equivalents of carboxyl of from about 0.5:1 to 20:1.
Claim 2
Dependent Claim
106 words
A rapid curing oxidizable epoxy resin-based coating composition of high solids content and possessing an extended working period comprising consisting essentially of a fluid mixture of a cyclohexene oxide moiety containing polyepoxide component having a 1,2 epoxy equivalency of at least 1.2, a carboxyl functional material reactive with said polyepoxide to cure the same, from 5-25% by weight of nonreactive organic solvent, and from 0.1-2.0% of stannous chloride as catalyst, based on the total weight of materials subjected to cure, the ratio of polyepoxide component to carboxyl functional material providing a ratio of equivalents of oxirane to equivalents of carboxyl of from about 0.5:1 to 20:1.
Claim 3
Dependent Claim
15 words
A coating composition as recited in claim 1 in which said polyepoxide is a diepoxide.
Claim 4
Dependent Claim
34 words
A coating composition as recited in claim 1 in which said carboxyl functional material is a resin selected from copolymers of monoethylenic carboxylic acids, polyesters, and mixtures of resinous polyol and polycarboxylic acid anhydride.
Claim 5
Dependent Claim
28 words
A coating composition as recited in claim 1 in which said carboxyl functional material is constituted by a mixture of a resinous polyol and a polycarboxylic acid anhydride.
Claim 6
Dependent Claim
16 words
A coating composition as recited in claim 4 in which said anhydride melts below about 60°C.
Claim 7
Dependent Claim
44 words
A coating composition as recited in claim 1 in which said polyepoxide carries two cyclohexene epoxide groups, there being from 1-6 parts of diepoxide per part of the carboxyl material, and said carboxyl functional material has an acid number in the range of 80-300.
Claim 8
Dependent Claim
23 words
A coating composition as recited in claim 6 in which said stannous chloride is present in an amount of from 0.2 - 1.0%.
Claim 9
Dependent Claim
36 words
A coating composition as recited in claim 1 in which said carboxyl functional material is a resin and is the major film forming resin, the equivalent ratio of oxirane to carboxyl being from 0.5:1 to 2:1.
Claim 10
Dependent Claim
23 words
A coating composition as recited in claim 8 in which said stannous chloride is present in an amount of from 0.1 - 1.0%.
Claim 11
Dependent Claim
18 words
A coating composition as recited in claim 1 in which said solvent is mainly constituted by an ether.
Claim 12
Dependent Claim
15 words
A coating composition as recited in claim 10 in which said ether is dimethoxy ethane.
Claim 13
Dependent Claim
106 words
A rapid curing oxidizable epoxy resin-based coating composition of high solids content and possessing an extended working period comprising a fluid mixture comprising consisting essentially of from 1-6 parts of diepoxide having two cyclohexene epoxide groups, one part of a carboxyl functional resin having an acid number in the range of 80-300 and reactive with said diepoxide to cure the same, from 5-25% of the weight of the mixture of nonreactive solvent, and from 0.1-2% of stannous chloride as catalyst, based on the total weight of materials subjected to cure, the ratio of equivalents of oxirane to equivalents of carboxyl being from about 0.5:1 to 20:1.
Claim 14
Dependent Claim
106 words
A rapid curing oxidizable epoxy resin-based coating composition of high solids content and possessing an extended working period comprising a fluid mixture comprising consisting essentially of from 1-6 parts of diepoxide having two cyclohexene epoxide groups, one part of a carboxyl functional resin having an acid number in the range of 80-300 and reactive with said diepoxide to cure the same, from 5-25% of the weight of the mixture of nonreactive solvent, and from 0.1-2% of stannous chloride as catalyst, based on the total weight of materials subjected to cure, the ratio of equivalents of oxirane to equivalents of carboxyl being from about 0.5:1 to 20:1.
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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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |