Use of co-grinding agents in a process to manufacture co-ground natural and precipitated calcium carbonates, suspensions and dry pigments obtained and their uses

摘要

The invention consists in the use, in a process of manufacture of GCC and PCC co-ground in water, of a co-grinding agent characterized in that: a) it is constituted by a least one homopolymer and/or at least one copolymer of acrylic acid, which is partially neutralised, of which the rate of molar neutralization is less than 75% of the total acid functions, b) and in that it is introduced: during the stage of preparation of the aqueous suspensions of GCC and PCC, and/or during stage 2) of co-grinding, and possibly during the stage of co-grinding and another stage of concentration, and possibly during this other stage of concentration. The invention also lies in the resulting aqueous suspensions of GCC and PCC, in the dry pigments of GCC and PCC obtained, and in the use of these products in paper, paint, rubber and plastic.