Treatment of Talc in a Solvent
AssigneeMondo Minerals B.V.
InventorsPatrick A. C. Gane, Daniel Gantenbein, Joachim Schoelkopf
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Abstract
The present invention is directed to a process for the treatment of talc, comprising the steps of (a) providing a talc having a first brightness value B1, measured according to ISO 2469, and forming a suspension of the talc in a liquid phase, the liquid phase of the suspension comprising at least one organic solvent, (b) delaminating and/or reducing the weight median particle size d50 of the talc, wherein the treated talc has a brightness value B2, measured according to ISO 2469, and B2≧B1.
Claims27
A process for the treatment of talc, comprising the steps of:
- (a) providing a talc having a first brightness value B1, measured according to ISO 2469, and forming a suspension of the talc in a liquid phase, the liquid phase of the suspension comprising at least one organic solvent,
- (b) delaminating and/or reducing the weight median particle size d50 of the talc, wherein the treated talc has a brightness value B2, measured according to ISO 2469, and B2≧B1.
Use of an organic solvent for increasing specific surface area, measured by the BET method according to ISO 9277 using nitrogen, of a talc while at least maintaining or increasing brightness, measured according to ISO 2469, of the talc.
Dependencies are inferred from the claim text.