Talc substances having specific surface properties, methods of m

Details Talc substances having specific surface properties, methods of m Talc substances having specific surface properties, methods of m

1992-02-24

1993-07-20

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

424683, 502410, C01B 3324, C01B 3322

Patent

active

052290948

ABSTRACT:
The invention relates to talc substances consisting of particles having a sheet structure. These substances are characterised in that each particle has internally the crystalline structure of talc which confers upon it certain specific properties of this mineral (softness, thermal stability) and has hydrophilic surface properties unlike the hydrophobic properties of mineral talc which give rise to useful reactivity. The substances according to the invention have a thermal and chemical stability range similar to that of talc. They can be manufactured by thermal or chemical means under conditions designed to avoid internal conversion of the talc and to effect the surface modifications consisting of replacing inert siloxane bridges by active hydrophilic groups.

REFERENCES:
patent: 3366501 (1968-01-01), Lamar
patent: 3939249 (1976-02-01), Huege
patent: 3954943 (1976-05-01), Newmann et al.
patent: 3965241 (1976-06-01), Baak et al.
patent: 4049780 (1977-09-01), Neumann
patent: 4978516 (1990-12-01), Yamada et al.
"Encapsulation of Inorganic Particle by Emulsion Polymerisation", Chemisty and Industry, Aug. 20, 1990, By R. Templeton-Knight, pp. 512-515.
"Hydrophilic Talc", Chemical Abstract, vol. 111, No. 26, Dec. 25, 1989, abstract no. 236090R, by Osamu Yamada, p. 180.

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