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US 5,961,836 AGranted
Method of producing milling adjuvants and/or dispersive agents, by physicochemical separation; adjuvants and agents thus obtained; and uses of same
AssigneeCoatex
InventorsJean-Bernard Egraz, Georges Ravet, Matthias Buri, Rene Blum
Life of this patent
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Abstract
A method of producing milling adjuvants and/or dispersing agents, with the use of a separation apparatus which is comprised of one or more organic and/or mineral membranes; a milling adjuvant and/or dispersing agent produced by said method; and use of said adjuvant/agent in preparing an aqueous suspension of mineral particles; and the use of the aqueous suspension in applications involving pigments.
Claims7
A method of producing a milling adjuvant or dispersing agent, comprising
- a) introducing a solution of a water-soluble separand material into a separation apparatus aid apparatus having one or more organic or mineral membranes, said one or more membranes being optionally borne on a support;
- and
- b) separating said water-soluble separand material into a plurality of permeate and retentate phases both phases containing fractions of said water-soluble separand material, said retentate phases containing higher molecular weight component than said permeate phases, by differences therebetween in hydrodynamic volume in a continuous or batch process;
- wherein at least one of said retentate phases contains said milling adjuvant or dispersing agent, and
- wherein said water soluble separand material is selected from the group consisting of a vinyl polymer, vinyl copolymer, acrylic polymer, acrylic copolymer, polycondensate polymer and polycondensate copolymer;
- and
- wherein said water-soluble separand material has at least one acidic functional group.
4 more elements
Dependencies are inferred from the claim text.