Use of co-grinding agents in a method for producing natural...

Details Use of co-grinding agents in a method for producing natural... Use of co-grinding agents in a method for producing natural...

C - Chemistry, Metallurgy

09

C

C09C 1/02 (2006.01) B02C 23/06 (2006.01) C01F 11/18 (2006.01) C09C 3/04 (2006.01) D21H 17/67 (2006.01) D21H 19/38 (2006.01)

Patent

CA 2629671

The invention relates to using co-grinding agent in a method for producing co-ground in water GCC and PCC, wherein said agent is characterised in that a) it comprises at least one type of partially neutralised acrylic acid copolymer whose molar neutralisation degree is less than 75 % of the totality of acid functions and b) said agent is introducible during preparation of the GCC and PCC aqueous solutions and/or during co-grinding stage, and possibly between the co-grinding stage and a concentration stage and possibly during said concentration stage. The obtainable GCC and PCC aqueous solutions, dry GCC and PCC pigments and the use of said products in paper, paints, rubber and plastic material are also disclosed.

L'invention consiste en l'utilisation, dans un procédé de fabrication de GCC et de PCC co-broyés dans l'eau, d'un agent de co-broyage caractérisé en ce que : a) il est constitué d'au moins un homopolymère et / ou d'un copolymère de l'acide acrylique partiellement neutralisé, dont le taux de neutralisation molaire est inférieur à 75 % de la totalité des fonctions acides, b) et en ce qu'il est introduit : - pendant l'étape de préparation des suspensions aqueuses de GCC et de PCC, et / ou pendant l'étape de co-broyage, et éventuellement entre l'étape de co-broyage et une autre étape de concentration, et éventuellement pendant cette autre étape de concentration. L'invention réside aussi dans les suspensions aqueuses de GCC et de PCC et les pigments secs de GCC et de PCC résultants, et dans l'utilisation de ces produits dans le papier, la peinture, le caoutchouc et le plastique.

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