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AssigneeOmya International AG
InventorsJoseph McJunkins, Charles Freeman
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A coating composition comprising an aqueous dispersion of submicron natural ground calcium carbonate particles contained in a liquid binder, wherein the resultant coating may constitute either a clear coat or a glossing and opacifying coating, depending upon the presence of certain additives such as a mineral pigment (e.g., TiO2). The composition is characterised in that comprises, in the case of a clear coating, at least one ground natural calcium carbonate having a median diameter of between 0.05 and 0.15 μm, while in the case of a glossing and opacifying coating, at least one ground natural calcium carbonate having a median diameter of between 0.05 and 0.3 μm and at least one pigment having a refractive index of greater than or equal to 2.5.
A glossing and opacifying coating composition comprising an aqueous nanoparticle dispersion and at least one binder, wherein the nanoparticles have at least one of three dimensions that are less than 250 nm (D90) (Mal) that are substantially dispersed in the at least one binder and have a mean particle size D50 (Mal) of less than 1 micron, wherein the nanoparticles comprise ground calcium carbonate, wherein the at least one binder is selected from the group consisting of vinyl-acrylic, styrene-acrylic, acrylic dispersions, solution acrylics, polyurethanes dispersed either in water or solvent, polymers containing ester groups including polyesters, polyester-based polyurethanes, polyester-based polyureas and polyester-based polyamides and wherein the composition includes at least one pigment having a refractive index greater than or equal to 2.5.
Dependencies are inferred from the claim text.