Paper coating formulation
AssigneesRohm and Haas Company, Dow Global Technologies LLC
InventorsRobert B. Frey, Wei Gao, John A. Roper, III, James Watson
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Abstract
The present invention is a composition comprising an aqueous dispersion of polymeric binder particles containing a substantial absence of phosphate and phosphonate groups; rutile TiO2 having a purity of at least 98% and a substantial absence of inorganic silica; and a dispersant which is a class of low molecular weight polyphosphates. The composition of the present invention is useful as a coating for paper or paperboard.
Claims8
A composition comprising an aqueous dispersion of a) from 3 to 25 weight percent polymeric binder particles containing a substantial absence of phosphate and phosphonate groups;
- b) from 5 to 35 weight percent rutile TiO2 having a purity of at least 98% and a substantial absence of inorganic silica;
- c) from 0.1 to 2 weight percent of a dispersant which is tetrasodium pyrophosphate, tetrapotassium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, or sodium hexametaphosphate;
- wherein the polymeric binder particles comprise vinyl acetate, vinyl-acrylic, styrene-acrylic, or styrene-butadiene polymer particles;
- and wherein the weight percentages are all based on the weight of total solids of the composition.
A laminate comprising coated or uncoated paper or paperboard;
- and a 5- to 35-μm thick layer of a film adhered to the coated or uncoated paper or paperboard;
- wherein the film comprises a) from 3 to 25 weight percent polymeric binder particles containing a substantial absence of phosphate and phosphonate groups;
- b) from 5 to 35 weight percent rutile TiO2 having a purity of at least 98% and a substantial absence of inorganic silica;
- c) from 0.1 to 2 weight percent of a dispersant which is tetrasodium pyrophosphate, tetrapotassium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium hexametaphosphate, or potassium hexametaphosphate;
- wherein the polymeric binder particles comprise vinyl acetate, vinyl-acrylic, styrene-acrylic, or styrene-butadiene polymer particles;
- and wherein the weight percentages are all based on the weight of total solids in the film.
Dependencies are inferred from the claim text.