Grinding aid of mineral materials in aqueous suspension, resulting aqueous suspensions and uses thereof
AssigneeCoatex
InventorsXueping Qiu, Jacques Mongoin, Christian Jacquemet
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Abstract
The invention concerns the use of hydrosoluble homopolymers and/or copolymers of acrylic/or methacrylic acid with one or more acrylic, vinyl or allyl monomers as an aid to the grinding of mineral particles in aqueous suspension, providing them by their use particular optical properties. The invention also concerns the said aqueous suspensions and their uses in the fields of paper and paint.
Claims17
The use of homopolymers and/or copolymers of acrylic acid and/or methacrylic acid with one or more acrylic, vinyl or allyl monomers as an agent for assisting the grinding of mineral fillers in aqueous suspension, characterised in that the said homopolymers and/or copolymers of acrylic acid and/or methacrylic acid with one or more acrylic, vinyl or allyl monomers are neutralised so that the molar percentage of neutralisation of the active acid sites of the polymer by means of a neutralisation agent containing a calcium ion is between 15% and 40% with a molar ratio of neutralisation of the active acid sites by means of one or more monofunctional neutralisation agents and in particular by means of a neutralisation agent containing a sodium ion of between 7% and 70%, a molar ratio of neutralisation of the active acid sites of the polymer by means of a neutralisation agent containing magnesium, baryum, zinc or aluminium ion, or a difunctional amine, or mixtures thereof, and particularly a neutralisation agent containing a magnesium ion of between 0% and 30%, and a molar ratio of non-neutralised active acid sites of between 15% and 78%.
Dependencies are inferred from the claim text.