Composites of inorganic and/or organic microparticles and nano-calcium carbonate particles
AssigneeOmya Development AG
InventorsMatthias Buri, Patrick A. C. Gane, René Vinzenz Blum
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Abstract
The present invention relates to composites, comprising inorganic and/or organic pigments and/or fillers in the form of microparticles, the surface of which is coated at least partially with finely divided nano-calcium carbonate with the help of binders based on copolymers comprising as monomers one or more dicarboxylic acids and one or more monomers from the group of diamines, triamines, dialkanolamines or trialkanolamines, a method for producing such composites, aqueous slurries thereof and their use in papermaking or in the field of paint and plastic production and the use of the inventive binders for coating the microparticles with nano-calcium carbonate.
Claims74
A composite, comprising inorganic and/or organic pigment and/or filler particles coated at least partially with a composition comprising calcium carbonate particles, and a binder, wherein
- the spherical equivalent diameter of the pigment and/or filler particles is in the micrometer range and the spherical equivalent diameter of the calcium carbonate particles is in the nanometer range;
- and
- the binder is a copolymer comprising as monomers one or more dicarboxylic acids and one or more monomers from the group of diamines, triamines, dialkanolamines or trialkanolamines,
- wherein the binder facilitates adhesion of the calcium carbonate particles to the surface of the pigment and/or filler particles, wherein the inorganic particles comprise talc, mica or a mixture thereof, and wherein the composite contains 0.1 to 10 wt% of the binder based on the total dry weight of the composite.
Inorganic and/or organic pigment and/or filler particles at least partially coated with (i) a copolymer comprising as monomers one or more dicarboxylic acids and one or more monomers from the group of diamines, triamines, dialkanolamines or trialkanolamines, wherein the inorganic and/or organic pigment and/or filler particles have a spherical equivalent diameter in the micrometer range, and wherein the inorganic particles comprise talc, mica or a mixture thereof, and (ii) a composition comprising calcium carbonate particles with a spherical equivalent diameter in the nanometer range, wherein the copolymer facilitates adhesion of the calcium carbonate particles to the surface of the pigment and/or filler particles, and wherein the composite contains 0.1 to 10 wt% of the binder based on the total dry weight of the composite.
Dependencies are inferred from the claim text.