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1. (WO2001032787) TREATING PARTICULATE ALKALINE EARTH METAL CARBONATES

Pub. No.:    WO/2001/032787    International Application No.:    PCT/GB2000/004240
Publication Date: Fri May 11 01:59:59 CEST 2001 International Filing Date: Sat Nov 04 00:59:59 CET 2000
IPC: C08K 9/04
C09C 1/02
Applicants: IMERYS MINERALS LIMITED
GOODMAN, Howard
Inventors: GOODMAN, Howard
Title: TREATING PARTICULATE ALKALINE EARTH METAL CARBONATES
Abstract:
A particulate alkaline earth metal carbonate material product has on its particles a coating consisting of two components: 1) a first coating comprising an aliphatic fatty acid and; 2) a second coating comprising an ester or earth alkaline salt of an aliphatic fatty acid. The second component has a substantially higher carbonate release temperature than the first coating agent. The amount of the first component may be insufficient to produce more than a monolayer, but the total amount of the first and second coating agent may exceed the required amount. The first component comprises stearic acid and the second component may comprise calcium distearate.