US4140816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous coating composition and process
Assignee: Lilly Industries Inc
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Filing: 1978-02-13
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Granted: 1979-02-20
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Expires: 1998-02-13
Abstract
Abstract A curable coating composition contains a polymer having pendant mercaptan groups and a bis-maleimide cross-linking agent. The mercaptan groups of the polymer cross-link with the bis-maleimide upon curing to form a fully cured coating. In a preferred embodiment, the coating composition serves as a cathodic electrocoating composition.
Inventors
- 👤 Vincent D. McGinniss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:27
CPC Classifications
C; C09; C09D; C09D181/00; C09D181/02; C08; C08G; C08G59/00; C08G59/14; C08G59/1494; C08G63/00; C08G63/68; C08G63/688; C08G75/00; C08G75/02; C08G75/04; C08G75/045; C08G85/00; C08G85/004; C09D167/00; C09D5/00; C09D5/44; C09D5/4488; C09D5/4496
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A process for coating a substrate with a film of a curable coating composition in aqueous dispersion, comprising: applying said coating composition to said substrate to form said film thereon, said coating composition comprising a polymer having at about 5% by weight pendant mercaptan groups, and said coating composition comprising at least about 5% bis-maleimide cross-linking agent by weight of said polymer.
Claim 2
Dependent Claim
62 words
A process for coating a substrate with a film of a curable coating composition in aqueous dispersion, comprising: applying said coating composition to said substrate to form said film thereon, said coating composition comprising a polymer having at about 5% by weight pendant mercaptan groups, and said coating composition comprising at least about 5% bis-maleimide cross-linking agent by weight of said polymer.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said film on said substrate is cured.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein said curing is by heating.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein said curing is by ionizing radiation.
Claim 6
Dependent Claim
31 words
The process of claim 2 wherein said coating composition also contains at least about 0.5% by weight of said polymer of an ultraviolet photosensitizer and said curing is by ultraviolet radiation.
Claim 7
Dependent Claim
38 words
The process of claim 2 wherein said polymer is dispersed in said aqueous dispersion by adding acid and alkyl halide or halogen to said polymer to form sulfonium ion groups from a minor portion of said mercaptan groups.
Claim 8
Dependent Claim
32 words
The process of claim 2 wherein said polymer also has a minor portion of pendant amine groups which are protonated with a proton-donating acid to disperse said polymer in said aqueous dispersion.
References Cited (Backward Citations)
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Cited
US3741942A
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US4035272A
Cited
US4025409A
Cited
US4029561A
Cited
US4035273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |