Subpigmentary titanium dioxide with improved photostability

Details Subpigmentary titanium dioxide with improved photostability Subpigmentary titanium dioxide with improved photostability

1994-11-03

1995-09-19

Bos, Steven

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

423266, C09C 300, C01G 2300

Patent

active

054512522

ABSTRACT:
Subpigmentary titanium dioxide with decreased photoactivity is produced if known ions for increasing photostability in titanium dioxide pigments are not deposited on the surface of the subpigmentary particles, but instead are included intracrystallinely in the pigment particle (i.e., doped). In a preferred process for preparation of doped subpigmentary titanium dioxide particles, an acid solution containing the dopant is added in two stages to a suspension of subpigmentary titanium dioxide.

REFERENCES:
patent: 2297523 (1942-09-01), Allan
patent: 3214283 (1965-10-01), Chopoorian
patent: 4036662 (1977-07-01), Rademachers et al.
patent: 4373013 (1983-02-01), Yoshizumi
patent: 4753829 (1988-06-01), Panush
Translation of German patent 2,545,243, Apr., 1977.

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