C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/21, 9/64, 117
C01F 11/18 (2006.01) C09C 1/02 (2006.01) C09C 3/06 (2006.01) D21H 17/63 (2006.01) D21H 19/38 (2006.01)
Patent
CA 1319491
ABSTRACT The invention relates to a process for the preparation of an acid-resistant coating and calcium carbonate particles, in which process a slurry of calcium carbonate particles is mixed simultaneously with the solution of a zinc compound and a solution of a silica-containing substance at a temperature of 70-95 C, the pH being maintained at 8-11. The invention also relates to calcium carbonate particles having an acid- resistant coating in accordance with the above-mentioned process In addition, the invention relates to the use of calcium carbonate particles having an acid-resistant coating in accordance with the above-mentioned process, as an acid- resistant filler in the production of paper at pH 4.0-7Ø
606021
Jaras Sven
Sikkar Rein
Tokarz Marek
Faxe Kalk
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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