Claims
- 1. A process for applying an adherent, hydrophobic coating to an object having an electroconductive surface comprising
- 1. immersing the object in a coating bath comprising an aqueous dispersion having a pH in the range from about 2 to about 12 of cation-active particles of water-insoluble, essentially electrically non-conductive, organic, film-forming polymer wherein a substantial portion of the cation-activity is provided by sulfoxonium cations; said aqueous dispersion having a conductivity of from about 300 micromhos to about 3,500 micromhos per centimeter;
- 2. passing an electric current through said bath sufficient to effect deposition of a coating of said polymer on the object by providing a difference of electrical potential between the object and an electrode that is
- a. spaced apart from said object
- b. in electrical contact with said bath
- c. electrically positive in relation to said object, said coating which is deposited continuing to be adherent in the presence of water after the difference of electrical potential is discontinued.
- 2. The process of claim 1 in which the electric current is direct current.
- 3. The process of claim 1 in which the aqueous dispersion has a solids content of from about 2 per cent to about 15 per cent by weight.
- 4. The process of claim 1 in which the dispersion is maintained at a pH of from about 6 to about 10.
- 5. The process of claim 1 in which the conductivity of the aqueous dispersion is from about 600 micromhos to about 1,800 micromhos per centimeter.
- 6. The process of claim 1 in which the aqueous dispersion contains a supporting electrolyte.
- 7. The process of claim 1 in which some of the cation-activity is provided by sulfonium cations.
- 8. The process of claim 1 in which the sulfoxonium cation has the formula ##STR4## wherein R.sup.2 and R.sup.3 individually are organic radicals having from 1 to 8 carbon atoms and Z.sup.- is a water-soluble, electrolytically acceptable anion.
- 9. The process of claim 8 in which the organic radicals R.sup.2 and R.sup.3 individually have from 1 to 4 carbon atoms.
- 10. The process of claim 1 in which the sulfoxonium cation is provided by an adsorbed sulfoxonium compound.
- 11. The process of claim 10 in which the sulfoxonium compound has the formula ##STR5## wherein R' is a long chain, monovalent, hydrophobic radical having from 8 to 25 carbon atoms, R.sup.2 and R.sup.3 individually are organic radicals having from 1 to 8 carbon atoms and Z.sup.- is a water-soluble, electrolytically acceptable anion; with the proviso that the total number of carbon atoms in R', R.sup.2 and R.sup.3 is from 13 to 30.
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 392,701, filed Aug. 29, 1973, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3501432 |
Wright et al. |
Mar 1970 |
|
3645872 |
Weigel |
Feb 1972 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
392701 |
Aug 1973 |
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