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US 4,284,546 AGranted
Coating substances with a high concentration of solids, for coated papers
AssigneeOmya S. A.
InventorsPierre Delfosse, Dieter Strauch
Life of this patent
Estimating the term…
Abstract
A novel high-solids coating substance for coating paper and the like is provided. The coatings are in the form of solutions having pigment concentrations greater than 70%. The coatings provide high gloss and contain particles of calcium carbonate as substantially the only pigment.
Claims3
A paper coating substance having a high solids content and containing natural calcium carbonate as substantially the only pigment;
- said calcium carbonate being in an aqueous form comprising 79.3% by weight of calcium carbonate;
- said aqueous calcium carbonate having a pH of about 9.5;
- all of the calcium carbonate particles being smaller than 2 .mu.m;
- 82.5% by weight of said calcium carbonate particles being smaller than 1 .mu.m;
- 14% by weight of said calcium carbonate particles being smaller than 0.2 .mu.m;
- said coating substance containing a synthetic binder consisting essentially of a styrene-acrylate latex in an amount of 12 parts by weight per 100 parts by weight of said calcium carbonate calculated dry;
- the concentration of solids in said coating substance comprising about 72% by weight.
4 more elements
A paper coating substance having a high solids content and containing natural calcium carbonate as substantially the only pigment;
- said calcium carbonate being in an aqueous form comprising 79.3% by weight of calcium carbonate;
- said aqueous calcium carbonate having a pH of about 9.5;
- all of the calcium carbonate particles being smaller than 2 .mu.m;
- 73% by weight of said calcium carbonate particles being smaller than 1 .mu.m;
- 30% by weight of said calcium carbonate particles being smaller than 0.5 .mu.m;
- 14% by weight of said calcium carbonate particles being smaller than 0.2 .mu.m;
- said coating substance containing a synthetic binder consisting essentially of a styrene-acrylate latex in an amount of 12 parts by weight per 100 parts by weight of said calcium carbonate calculated dry;
- the concentration of solids in said coating substance comprising about 72% by weight;
- said calcium carbonate having a specific surface (g/m.sup.2) of 17.
6 more elements
Dependencies are inferred from the claim text.