Process for improving photostability of titanium dioxide pigment

Details Process for improving photostability of titanium dioxide pigment Process for improving photostability of titanium dioxide pigment

1990-11-19

1991-08-06

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

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

106436, 106499, C09C 136

Patent

active

050374761

ABSTRACT:
Paints and coatings involving semiconducting pigments such as titanium dioxide generally degrade because of oxidation of the binder by reactants that are photochemically produced on the pigment surface, and because of direct binder oxidation by charges that are photogenerated in the pigment. In titanium dioxide, this interaction is substantially reduced by avoiding reduced species and by introducing into the titanium dioxide trap states where photogenerated electron-hole pairs recombine by processes such as prolonged milling. Through these expedients, a substantial increase in the stability of the pigment containing composition is obtained.

REFERENCES:
patent: 2346085 (1944-04-01), Sawyer
patent: 3208866 (1965-09-01), Lewis et al.
patent: 3937797 (1976-02-01), Romanski et al.
patent: 4310483 (1982-01-01), Dorfel et al.
patent: 4388435 (1983-06-01), Loch

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