TiO.sub.2 Pigment coated with dense silica and porous alumina/si

Details TiO.sub.2 Pigment coated with dense silica and porous alumina/si TiO.sub.2 Pigment coated with dense silica and porous alumina/si

1976-09-30

1978-02-21

Poer, J.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106308B, C09C 136

Patent

active

040750310

ABSTRACT:
A coated titanium dioxide pigment and the process for its preparation consisting essentially of a core of pigmentary titanium dioxide (TiO.sub.2), a dense inner coating of dense amorphous silica (SiO.sub.2) in an amount from 1 to 10% by weight, based on the uncoated pigment, and, optionally, up to 15% of alumina (Al.sub.2 O.sub.3) and a porous outer coating of porous silica (SiO.sub.2) and alumina (Al.sub.2 O.sub.3), said porous silica being present in an amount from 0.5 to 15% by weight and said alumina being present in an amount from 0 to 15% by weight, based on the uncoated pigment. As a component of coating compositions, this pigment providesa high degree of hiding power and durability for indoor and outdoor applications.

REFERENCES:
patent: 3437502 (1969-04-01), Werner
patent: 3510335 (1970-05-01), McGinnis
patent: 3897261 (1975-07-01), Allen
patent: 3928057 (1975-12-01), De Colibas

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