Pigmented microporous silica microspheres produced by a water in

Details Pigmented microporous silica microspheres produced by a water in Pigmented microporous silica microspheres produced by a water in

1975-11-25

1978-05-23

Smith, Ronald H.

Compositions: coating or plastic

Materials or ingredients

106309, 423338, 428402, C01B 3312, C09C 130

Patent

active

040908879

ABSTRACT:
Pigmented silica microspheres having an average diameter from 2 .mu.m to 100 .mu.m and consisting essentially of from 10% to 70% by weight of particulate pigment, dispersed throughout a microporous silica matrix and, optionally, containing a coating of dense amorphous silica. The microspheres are produced by acidifying a water-in-oil emulsion. The pigmented silica micropheres are particularly useful as opacifying agents for coating compositions and as fillers for paper.

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patent: 4011096 (1977-03-01), Sandell

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