Cured silicone powder and process for the preparation thereof
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsYoshitsugu Morita, Atsushi Sasaki, Noriyasu Yokoyama
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Abstract
There is disclosed a process comprising (I) preparing a water-based dispersion of (A) a cured silicone powder having an average particle diameter of 0.1 to 200 micrometers and (B) an amorphous silica micropowder that has an average particle diameter not exceeding 1 micrometer and a surface silanol group density of at least 2 silanol groups per 100 square angstroms; (II) heating said water-based dispersion; and (III) removing the water from said dispersion, thereby producing a cured silicone rubber composition wherein the silica micropowder is immobilized on the surface of the cured silicone powder.
Claims19
A composition prepared by a process comprising:
- (I) preparing a water-based dispersion of
- (A) a cured silicone powder having an average particle diameter of 0.1 to 200 micrometers and
- (B) an amorphous silica micropowder having an average particle diameter of .ltoreq.1 micrometer and a surface silanol group density of at least 2 silanol groups per 100 square angstroms;
- (II) heating said water-based dispersion;
- and
- (III) removing the water from said dispersion, wherein said silica micropowder is immobilized on the surface of said cured silicone powder.
A process for preparing a cured silicone powder composition comprising:
- (I) preparing a water-based dispersion of
- (A) a cured silicone powder having an average particle diameter of 0.1 to 200 micrometers and
- (B) an amorphous silica micropowder that has an average particle diameter not exceeding 1 micrometer and a surface silanol group density of at least 2 silanol groups per 100 square angstroms;
- (II) heating said water-based dispersion;
- and
- (III) removing the water from said dispersion.
Dependencies are inferred from the claim text.