US 6,767,973 B2 · Use of water soluble polymers as dispersion agent of aqueous calcium carbonate suspension, resulting aqueous suspensions and their uses

Abstract

The invention relates to the use of homopolymers and/or water-soluble copolymers of acrylic acid with one or more acrylic, vinyl or allylic monomers as dispersing agents for aqueous suspensions of mineral particles issuing from a mechanical and/or thermal reconcentration step following upon a step of wet grinding without the use of a dispersant and at low concentration in terms of dry matter. The invention also relates to the said aqueous suspensions and their uses in the fields of paper, paint, fillers for synthetic resins and rubbers, detergent and cleaning formulations, ceramics, drilling fluids, cements, plasters and other fields of application in civil engineering and the construction industry.

Claims28

Dependent claims

A dispersing agent for an aqueous suspension of mineral particles, said dispersing agent comprising a homopolymer of acrylic acid, a water-soluble copolymer of acrylic acid with one or more acrylic, vinyl or allylic monomers, or both the homopolymer and the copolymer,

wherein the homopolymer or copolymer has a molecular weight corresponding to a viscosity index with a value from 0.08 to 0.80, and wherein said mineral particles are derived from mechanical reconcentration, thermal reconcentration, or both mechanical and thermal reconcentration after wet grinding in the absence of a dispersant at low concentrations of dry matter.

Dependencies are inferred from the claim text.

Facts

Application

10/168,389Filed 21 Jun 2002

Priority

FR 99 1654127 Dec 1999

Published

US 2003/0045647 A16 Mar 2003

Granted

27 Jul 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C09C 3/04
Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties: physical treatment,…
C09C 3/041
Physical treatment, e.g. grinding or treatment with ultrasonic vibrations: grinding
C09K 23/00
Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
C01P 2004/62
Particles characterised by their size: submicrometer sized, i.e. from 0.1-1 micrometer

Use of water soluble polymers as dispersion agent of aqueous calcium carbonate suspension, resulting aqueous suspensions and their uses

Life of this patent

Use of water soluble polymers as dispersion agent of aqueous calcium carbonate suspension, resulting aqueous suspensions and their uses

Life of this patent

Abstract

Claims28