Robert W Sheppard

US Patent:

59682507, Oct 19, 1999

Filed:

Jun 6, 1997

Appl. No.:

8/870501

Inventors:

Robert Reynolds Sheppard - Macon GA
Karen Ann Gruber - Hamilton NJ

Assignee:

Engelhard Corporation - Iselin NJ

International Classification:

C09D 544
C09C 142

US Classification:

106486

Abstract:

Disclosed are kaolin compositions of at least one hydrous kaolin characterized by a particle size distribution where 98% of the particles are less than about 2. mu. , 90% are less than about 0. 5. mu. and the median particle size is less than about 0. 3. mu. Also disclosed is a process which involves the steps (i) preparing an aqueous slurry of at least one hydrous kaolin; (ii) separating the particles from said slurry so that the particle size distribution is such that 98% of the particles are less than about 2. mu. , 90% are less than about 0. 5. mu. and a median particle size is less than about 0. 3. mu. ; and (iii) drying said separated particles. Pigment pastes and electrodeposition paints containing said compositions as well as cationic electrodeposition of said paint on a substrate and the article of manufacture prepared thereby are disclosed.