Method of milling minerals in the presence of a poly (itaconate)
AssigneeCoatex
InventorsHenri Grondin, Christian Jacquemet, Benoit Magny
Life of this patent
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Abstract
The invention relates to a method for producing particles of mineral material comprising grinding of at least one mineral material in the presence of water. The grinding according to the invention is carried out in the presence of at least one polymer obtained by a radical polymerization reaction of a partial sodium salt of itaconic acid and partial decarboxylation of the polymer obtained followed by partial or total neutralization of the decarboxylated polymer. The invention also relates to an aqueous composition comprising particles of ground mineral material and such a polymer, in particular a mass-loading composition for the production of paper or a paper-coating-colour composition.
Claims15
A method for producing mineral material particles, the method comprising grinding at least one mineral material in the presence of water and at least one polymer so that the at least one mineral material has a particle size of 0.05-50 μm, wherein the at least one polymer is obtained by:
- performing a radical polymerization reaction of a partial sodium salt of itaconic acid in the presence of sodium hypophosphite, at a temperature above 50° C. to obtained an itaconic acid polymer;
- partially decarboxylating the itaconic acid polymer to obtain a decarboxylated polymer;
- and
- partially or totally neutralizing the decarboxylated polymer with a derivative comprising sodium to obtain the at least one polymer.
A method for producing a paper-mass-loading composition or a paper-coating colour composition, the method comprising grinding at least one mineral material in the presence of water and at least one polymer to form an aqueous suspension of particles of the at least one mineral material,
- wherein the at least one mineral material has a particle size of 0.05-50 pan,
- wherein the at least one polymer is obtained by:
- performing a radical polymerization reaction of a partial sodium salt of itaconic acid in the presence of sodium hypophosphite, at a temperature above 50° C., to obtained an itaconic acid polymer;
- partially decarboxylating the itaconic acid polymer to obtain a decarboxylated polymer;
- and
- partially or totally neutralizing the decarboxylated polymer with a derivative comprising sodium, to obtain the at least one polymer.
A grinding aid for particles of mineral material, the grinding aid comprising a polymer that is obtained by:
- performing a radical polymerization reaction of a partial sodium salt of itaconic acid in the presence of sodium hypophosphite, at a temperature above 50° C., to obtained an itaconic acid polymer;
- partially decarboxylating the itaconic acid polymer to obtain a decarboxylated polymer;
- and
- partially or totally neutralizing the decarboxylated polymer with a derivative comprising sodium, to obtain the at least one polymer.
Dependencies are inferred from the claim text.