Use of (meth)acrylic polymers in a method for manufacturing...

Details Use of (meth)acrylic polymers in a method for manufacturing... Use of (meth)acrylic polymers in a method for manufacturing...

C - Chemistry, Metallurgy

09

C

C09C 1/02 (2006.01)

Patent

CA 2726474

The invention relates to the use, in a method comprising a first step of grinding into a calcium carbonate aqueous medium, of an acrylic polymer having a molecular weight between 8,000 g/mol and 15,000 g/mol and a mole content less than 20% in polymer chains having a molecular weight less than 3,000 g/mol. Said method, comprising a second step that is a concentration step, leads to an aqueous suspension with an increased slope factor, which improves the opacity of the coated paper obtained from said suspension.

L'objet de l'invention consiste en Putilisation dans un procede comportant une premiere etape de broyage en milieux aqueux de carbonate de calcium naturel, d'un polymere acrylique ayant un poids moleculaire compris entre 8 000 g/mol et 15 000 g/mol et une teneur molaire inferieure a 20 % en chaïnes polymeriques de poids moleculaire inferieur a 3 000 g/mol. Ce procede, comportant une deuxieme etape qui est une etape de concentration, conduit a une suspension aqueuse avec un facteur de pente augmente, ce qui ameliore l'opacite du papier couche a partir d'une telle suspension.

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