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US4399256A
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Surface-coating binders containing blocked isocyanate groups, and their use in cathodic electrocoating
Assignee: BASF SE
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Filing: 1981-04-07
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Granted: 1983-08-16
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Expires: 2001-04-07
Abstract
Abstract Surface-coating binders based on a copolymer which contains tertiary amino groups, blocked isocyanate groups, hydroxyl groups and ether groups and which, due to partial or complete salification with an acid, is water-soluble or water-dispersible. This copolymer contains, as copolymerized units, one or more olefinically unsaturated compounds possessing a tertiary amino group, an N-(1-alkenyl) isocyanate blocked with a CH--, OH-- or NH-acidic blocking agent, an adduct of an epoxy resin based on bisphenol A and epichlorohydrin, and having a molecular weight of from 380 to 3,500, with an olefinically unsaturated alcohol of 3 to 20 carbon atoms, and one or more other copolymerizable olefinically unsaturated compounds, and has a mean molecular weight of from 1,000 to 20,000. The novel surface-coating binder is used for the cathodic electrocoating of metallic articles.
Inventors
- 👤 Jurgen Gimpel
- 👤 Karl-Heinz Feuerherd
- 👤 Hans-Uwe Schenck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:15
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4407; C09D5/4415; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08G18/70; C08G18/72; C08G18/728
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
A surface-coating binder based on a copolymer which contains tertiary amino groups, blocked isocyanate groups, hydroxyl groups and ether groups and which, due to partial or complete salification with an acid, is water-soluble or water-dispersible, and wherein the copolymer contains, as copolymerized units, (A) from 6 to 22% by weight of one or more olefinically unsaturated compounds containing a tertiary amino group, (B) from 10 to 35% by weight of vinyl isocyanate or propenyl isocyanate blocked with a CH--, OH-- or NH-acidic blocking agent, (C) from 20 to 50% by weight of an adduct of an epoxy resin, based on bisphenol A and epichlorohydrin and having a molecular weight of from 380 to 3,500, with an olefinically unsaturated alcohol of 3 to 20 carbon atoms, (D) from 10 to 64% by weight of one or more copolymerizable olefinically unsaturated compounds not already mentioned under (A) to (C), with the proviso that the copolymer has a mean molecular weight of from 1,000 to 20,000 and that the sum of the percentages of (A) to (D) is 100.
Claim 2
Dependent Claim
176 words
A surface-coating binder based on a copolymer which contains tertiary amino groups, blocked isocyanate groups, hydroxyl groups and ether groups and which, due to partial or complete salification with an acid, is water-soluble or water-dispersible, and wherein the copolymer contains, as copolymerized units, (A) from 6 to 22% by weight of one or more olefinically unsaturated compounds containing a tertiary amino group, (B) from 10 to 35% by weight of vinyl isocyanate or propenyl isocyanate blocked with a CH--, OH-- or NH-acidic blocking agent, (C) from 20 to 50% by weight of an adduct of an epoxy resin, based on bisphenol A and epichlorohydrin and having a molecular weight of from 380 to 3,500, with an olefinically unsaturated alcohol of 3 to 20 carbon atoms, (D) from 10 to 64% by weight of one or more copolymerizable olefinically unsaturated compounds not already mentioned under (A) to (C), with the proviso that the copolymer has a mean molecular weight of from 1,000 to 20,000 and that the sum of the percentages of (A) to (D) is 100.
Claim 3
Dependent Claim
41 words
A surface-coating binder as set forth in claim 1, wherein component (B) is an adduct of vinyl isocyanate or propenyl isocyanate with cyclohexanol, t-butanol, ε-caprolactam, methyl ethyl ketone-oxime or triazabenzene, in the molar ratio of isocyanate to blocking agent of 1:1.
Claim 4
Dependent Claim
40 words
A surface-coating binder as set forth in claim 1 or 2, wherein the ratio of the number of equivalents of reactive hydrogens of component (C) to the number of equivalents of blocked isocyanate groups of component (B) is about 1:1.
Claim 5
Dependent Claim
74 words
A surface-coating binder as set forth in claim 1, wherein the copolymer contains N,N-dimethylaminopropyl methacrylamide as component (A), vinyl isocyanate, blocked with ε-caprolactam or methyl ethyl ketone-oxime, as component (B), a reaction product of an epoxy resin, obtained from bisphenol A and epichlorohydrin and having a mean molecular weight of 900, with allyl alcohol, as component (C) and butyl acrylate or 2-ethylhexyl acrylate as component (D), the said components being present as copolymerized units.
Claim 6
Dependent Claim
23 words
A process for the cathodic electrocoating of metallic articles, wherein the binder used is a surface-coating binder as set forth in claim 1.
Claim 7
Dependent Claim
31 words
A process for the cathodic electrocoating of metallic articles, wherein the binder used is a mixture of the surface-coating binder as set forth in claim 1 and a polyfunctional crosslinking agent.
Claim 8
Dependent Claim
21 words
A process as set forth in claim 6, wherein the polyfunctional crosslinking agent used is a hydroxyl-containing polymer, polyester or polyadduct.
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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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |