Patent ID: 8282730
Filing Date: 2012-10-09
Classification: B02C,C01F,C01P,C09C,D21H

Abstract:
1. A process of manufacturing co-ground GCC and PCC, comprising the stages of: 1. preparing 2. co-grinding the aqueous suspensions of GCC and PCC, as prepared in stage 1), 3. optionally concentrating the aqueous suspension of the co-ground GCC and PCC, as obtained after stage 2), and 4. optionally drying the aqueous suspension of the co-ground GCC and PCC, as obtained after stage 2) or 3), characterised in that: (a) a co-grinding agent is introduced: (b) wherein the co-grinding agent is at least one homopolymer of acrylic acid and/or at least one copolymer of acrylic acid, which is partially neutralised, and of which 50% or less by mole of the total acid functions are neutralized, wherein the co-grinding agent has a molecular weight of 4,000-10,000 g/mole, and wherein the co-grinding agent has a polydispersity index of 1.5-2.5.