Patent ID: 9644100
Date: 2017-05-09
CPC Classifications: C01P,C09C

Claim:
1. Self-binding pigmentary particles comprising at least one inorganic matter and at least one binder, said pigmentary particles obtained by a process comprising the following stages: a) forming one or more aqueous suspensions of at least one inorganic matter comprising calcium carbonate; b) forming or obtaining one or more aqueous solutions or suspensions or emulsions of at least one binder selected from the group consisting of (i) semi-crystalline latexes or solutions of soluble binders, (ii) latexes in emulsion or solutions of soluble binders comprising polyvinylic alcohol, polyvinyl acetate, starch, casein, proteins, carboxymethyl cellulose (CMC), ethyl hydroxyethyl cellulose (EHEC), or their mixtures, and (iii) emulsions of polyethylene waxes or copolymers in their neutralized form of polyethylene with other monomer units or other monomers or their mixtures; and c) co-grinding the aqueous suspension or suspensions obtained in stage a) with the aqueous solutions or suspensions or emulsions obtained in stage b) in a mill so as to obtain an aqueous suspension of self-binding pigmentary particles comprising the inorganic matter and the binder adsorbed on the surface of the inorganic matter, wherein the self-binding pigmentary particles comprises at least 5% by weight of the at least one binder, and wherein the average particle diameter of the self-binding pigmentary particles so obtained is less than the average particle diameter of the inorganic matter from stage a); d) optionally drying or increasing the concentration of the aqueous suspension obtained in stage c).