EP0199663A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of electrodepositing cationic resin compositions without the need for volatile organic coalescent solvents
Assignee: BASF Corp
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Filing: 1986-02-13
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Granted: —
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Expires: 2006-02-13
Abstract
Abstract An improved method of coating objects in an aqueous cathodic electrodeposition bath. The use of volatile organic coalescent solvents is eliminated by using a blocked crosslinking agent which is the reaction product of a polyetherpolyol and a polyfunctional isocyanate. The coatings are smooth, flexible and have high film build.
Inventors
- 👤 Tapan K. Debroy
- 👤 Ding-Yu Chung
- 👤 Gerald G. Wold
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:21
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4419; C09D5/443; C09D5/4453; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08G18/10; C08G18/28; C08G18/40; C08G18/64; C08G18/6415; C08G18/643
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
178 words
A method of coating articles with a film-forming resin using a cathodic electrodeposition process wherein a cathodic electrodepositable amine-containing epoxide resin is mixed with a crosslinking agent, the resin is then salted with acid to form an aqueous emulsion, the aqueous emulsion is mixed with a pigment paste and water to form an aqueous electrocoat coating bath, the bath is contained in an electrically insulated tank containing an anode, a conductive article is electrically connected to a direct current circuit to act as a cathode, the article is then immersed in the bath and a direct electric current is passed across the article resulting in the deposition of the film of the resin and crosslinking agent and pigment paste, then the article is removed from the bath and the coating is cured, the improvement wherein a crosslinking agent is used comprising the reaction product of polyetherpolyol, a polyisocyanate, and a blocking agent, wherein the resulting coating is smooth, flexible, and high build, thereby substantially reducing or eliminating the need for volatile organic coalescent solvents in the coating bath.
Claim 2
Independent Claim
178 words
A method of coating articles with a film-forming resin using a cathodic electrodeposition process wherein a cathodic electrodepositable amine-containing epoxide resin is mixed with a crosslinking agent, the resin is then salted with acid to form an aqueous emulsion, the aqueous emulsion is mixed with a pigment paste and water to form an aqueous electrocoat coating bath, the bath is contained in an electrically insulated tank containing an anode, a conductive article is electrically connected to a direct current circuit to act as a cathode, the article is then immersed in the bath and a direct electric current is passed across the article resulting in the deposition of the film of the resin and crosslinking agent and pigment paste, then the article is removed from the bath and the coating is cured, the improvement wherein a crosslinking agent is used comprising the reaction product of polyetherpolyol, a polyisocyanate, and a blocking agent, wherein the resulting coating is smooth, flexible, and high build, thereby substantially reducing or eliminating the need for volatile organic coalescent solvents in the coating bath.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the polyetherpolyol is an alkylene oxide condensate of a polyol.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the polyisocyanate is an aromatic or aliphatic polyisocyanate.
Claim 5
Dependent Claim
24 words
The method of claim 3 wherein the polyisocyanate is selected from the group consisting of toluene disocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein the blocking agent selected from the group consisting of monoalcohols, oximes, and caprolactam.
Claim 7
Dependent Claim
69 words
An aqueous cathodic electrodeposition coating bath comprising water, an acid solubilized amine-containing epoxy resin and crosslinking agent, and pigment paste, wherein the improvement comprises the use of a crosslinking agent comprising the reation product of a polyetherpolyol, a polyisocyanate, and a blocking agent, wherein the coatings produced are smooth, high build, and flexible, thereby substantially reducing or eliminating the need for coalescent volatile organic solvents in the coating bath.
Claim 8
Dependent Claim
69 words
An aqueous cathodic electrodeposition coating bath comprising water, an acid solubilized amine-containing epoxy resin and crosslinking agent, and pigment paste, wherein the improvement comprises the use of a crosslinking agent comprising the reation product of a polyetherpolyol, a polyisocyanate, and a blocking agent, wherein the coatings produced are smooth, high build, and flexible, thereby substantially reducing or eliminating the need for coalescent volatile organic solvents in the coating bath.
Claim 9
Dependent Claim
17 words
The coating bath of claim 6 wherein the polyetherpolyol is an alkylene oxide condensate of a polyol.
Claim 10
Dependent Claim
15 words
The coating bath of claim 6 wherein the polyisocyanate is an aromatic or aliphatic polyisocyanate.
Claim 11
Dependent Claim
24 words
The coating bath of claim 8 wherein the polyisocyanate is selected from group consisting of toluene diisocyanate, 4.4'-diphenylmethene diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.
Claim 12
Dependent Claim
21 words
The coating bath of claim 6 wherein the blocking agent is selected from the group consisting of monoalcohols, oximes, and caprolactam.
Claim 13
Dependent Claim
15 words
A coated article produced by the process of claims 1, 2, 3, 4 or 5.
References Cited (Backward Citations)
US4182831A
Cited
EP0074634A2
Cited
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