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US4357221A
Expired / Lapsed
US
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Process for coating electrically conductive objects with polyurethane
Assignee: BASF SE
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Filing: 1981-02-05
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Granted: 1982-11-02
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Expires: 2001-02-05
Abstract
Abstract A process for coating electrically conductive objects comprising A. immersing said object as the anode of an electric current in an aqueous polyurethane dispersion prepared by (1) forming a polyurethane solution by reacting an organic polyisocyanate in the presence of an organic solvent with (a) an acrylic ester diol having a molecular weight of between 146 and 3,000; (b) an organic polyhydroxyl compound other than (a) having a molecular weight between 400 and 5,000 selected from the group consisting of polyester, polyols, polyether polyols, polycarbonates, polylactones, and mixtures thereof; and (c) a chain extender selected from the group consisting of diols, triols, diamines, aminoalcohols, having a molecular weight between 62 and 400, water, and mixtures thereof; (2) forming an anionic polyurethane addition product by reacting said polyurethane solution with a mercaptocarboxylic acid salt in the presence of a solvent; (3) adding water; and (4) removing the organic solvent, and B. passing an electric current between the anode and a cathode which is also dispersed in said dispersion, and C. irradiating said object with ultraviolet radiation or electron rays. The process can be used for coating metals such as iron, steel and aluminum.
Inventors
- 👤 August Lehner
- 👤 Juergen Gimpel
- 👤 Ingolf Buethe
- 👤 Heinrich Hartmann
- 👤 Hans-Uwe Schenck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:47
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4419; C09D5/4465; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/6705; C08G18/675; C08G18/83; C08G18/834; C08G18/835
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
179 words
A process for coating electrically conductive objects comprising A. immersing said object as the anode of an electric current in an aqueous polyurethane dispersion prepared by (1) forming a polyurethane solution by reacting an organic polyisocyanate in the presence of an organic solvent with (a) an acrylic ester diol having a molecular weight of between 146 and 3,000; (b) an organic polyhydroxyl compound other than (a) having a molecular weight between 400 and 5,000 selected from the group consisting of polyester polyols, polyether polyols, polycarbonates, polylactones, and mixtures thereof; and (c) optionally a chain extender selected from the group consisting of diols, triols, diamines, aminoalcohols, having a molecular weight between 62 and 400, water, and mixtures thereof; (2) forming an anionic polyurethane addition product by reacting said polyurethane solution with a mercaptocarboxylic acid salt in the presence of a solvent; (3) adding water; and (4) removing the organic solvent, and B. passing an electric current between the anode and a cathode which is also dispersed in said dispersion, and C. irradiating said object with ultraviolet radiation or electron rays.
Claim 2
Dependent Claim
179 words
A process for coating electrically conductive objects comprising A. immersing said object as the anode of an electric current in an aqueous polyurethane dispersion prepared by (1) forming a polyurethane solution by reacting an organic polyisocyanate in the presence of an organic solvent with (a) an acrylic ester diol having a molecular weight of between 146 and 3,000; (b) an organic polyhydroxyl compound other than (a) having a molecular weight between 400 and 5,000 selected from the group consisting of polyester polyols, polyether polyols, polycarbonates, polylactones, and mixtures thereof; and (c) optionally a chain extender selected from the group consisting of diols, triols, diamines, aminoalcohols, having a molecular weight between 62 and 400, water, and mixtures thereof; (2) forming an anionic polyurethane addition product by reacting said polyurethane solution with a mercaptocarboxylic acid salt in the presence of a solvent; (3) adding water; and (4) removing the organic solvent, and B. passing an electric current between the anode and a cathode which is also dispersed in said dispersion, and C. irradiating said object with ultraviolet radiation or electron rays.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the ratio of isocyanate groups to reactive hydrogen atoms in forming the polyurethane solution is 0.4:1 to 1.3:1.
Claim 4
Dependent Claim
24 words
The process according to claims 1 and 2 wherein the aqueous dispersion contains 5 to 20 percent by weight of anionic polyurethane addition product.
Claim 5
Dependent Claim
34 words
The process according to claim 3 wherein 50 percent by weight of the anionic polyurethane addition product is replaced by at least diolefinically unsaturated organic compounds having a molecular weight between 130 and 2000.
Claim 6
Dependent Claim
43 words
The process of claim 4 wherein the reaction product of diglycidyl ether and Bisphenol A with acrylic acid in a mole ratio of 1:2 is used as the at least doubly olefinically unsaturated organic compound having a molecular weight between 130 and 2000.
Claim 7
Dependent Claim
38 words
The process of claim 1 wherein the polyurethane solution is reacted with such quantities of the mercaptocarboxylic acid salts that the content of carboxylate groups of the anionic polyurethane addition product is 3 to 15 percent by weight.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein the ratio of isocyanate groups to reactive hydrogens in the polyurethane solution is 0.5:1 and 1:2:1.
Claim 9
Dependent Claim
35 words
The process of claim 1 wherein the anionic polyurethane addition product to be used contains 0.3 to 3 moles of acrylic ester carbon to carbon double bonds per 1000 grams of anionic polyurethane addition product.
Claim 10
Dependent Claim
35 words
The process of claim 1 wherein the anionic polyurethane addition product contains a water-insoluble photoinitiator for ultraviolet rays in a quantity of 1 to 4 percent by weight relative to the anionic polyurethane addition product.
Claim 11
Dependent Claim
12 words
A coated object prepared in accordance with the process of claim 1.
Claim 12
Dependent Claim
23 words
The coated object of claim 10 wherein the object coated is a metal selected from the group consisting of iron, steel, and aluminum.
References Cited (Backward Citations)
US3928667A
Cited
US4066591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |