Paper coating composition with increased thickener efficiency
AssigneeAqualon Company
InventorsDirk Kruythoff, Andre H. Van Waveren
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Abstract
A paper coating composition is provided having a clay-containing pigment system, a binder, a polysaccharide thickener, and at least 0.005% to 2%, based upon the weight of the polymer, of a blocking agent that serves to prevent more than 25% of the polysaccharide thickener from being adsorbed onto the clay pigment surface. This coating is applied to raw paper for producing a high quality paper with smooth and substantially free of indentations surfaces for good ink to paper transfer.
Claims7
A paper coating composition comprising a clay-containing pigment system, a binder, a polysaccharide thickener selected from the group consisting of a water soluble alkylhydroxyalkylcellulose, hydroxyalkylcellulose, carboxymethylhydroxyethylcellulose, a hydrophobically modified hydroxyalkylcellulose, alkylhydroxyalkylcellulose, carboxyalkylhydroxyalkylcellulose, and mixtures thereof and at least 0.005%-2%, based upon the weight of the pigment, of a blocking agent selected from the group consisting of poly(vinyl alcohol) having a molecular weight in the range of 4,000-50,000, poly(ethylene oxide) having a molecular weight in the range of 1,000-50,000, alkylethoxylate or an alkylaryl ethoxylate containing at least 25 oxyethylene units, and protein and serves to prevent more than 25% of the polysaccharide thickener from being adsorbed onto the clay pigment surface.
Dependencies are inferred from the claim text.