Eugene Q Richardson

US Patent:

52039757, Apr 20, 1993

Filed:

Oct 29, 1991

Appl. No.:

7/784241

Inventors:

Eugene Richardson - Pennsauken NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C25D 1312

US Classification:

2041811

Abstract:

An electrocoating process in which a layer of an electrically conductive cathodic electrocoating composition containing film forming binder and pigment in a pigment to binder weight ratio of about 1:100 to 100:100, wherein the pigment comprises an electrically conductive pigment of silica which is either amorphous silica or a silica containing material, the silica is in association with a two-dimensional network of antimony-containing tin oxide crystallites in which the antimony content ranges from about 1-30% by weight of the tin oxide is electrocoated onto a metal substrate and cured to form a coated substrate, wherein the resulting layer has a resistance of less than 10. times. 10. sup. 15 ohms, a layer of a clear cathodic electrocoating composition is electrocoated over the layer of the conductive composition and the layer clear composition is cured to form a clear layer on the substrate.

US Patent:

51787369, Jan 12, 1993

Filed:

Jul 19, 1991

Appl. No.:

7/733202

Inventors:

Eugene Richardson - Pennsauken NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C25D 1310

US Classification:

2041811

Abstract:

Disclosed herein are cathodic electrocoat compositions which contain electroconductive pigments. These pigments are light in color, and can be added at higher pigment to binder ratios for improved edge coverage. More specifically, the electroconductive pigments are a two-dimensional network of antimony-containing tin oxide crystallites which exist in a unique association with amorphous silica or with a silica-containing material.

US Patent:

51045834, Apr 14, 1992

Filed:

May 7, 1990

Appl. No.:

7/520284

Inventors:

Eugene Richardson - Pennsauken NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

H01B 106

US Classification:

252518

Abstract:

Disclosed herein are cathodic electrocoat compositions which contain electroconductive pigments. These pigments are light in color, and can be added at higher pigment to binder ratios for improved edge coverage. More specifically, the electroconductive pigments are a two-dimensional network of antimony-containing tin oxide crystallites which exist in a unique association with amorphous silica or with a silica-containing material.