Paper coating composition with improved optical brightener carriers
AssigneeHercules Incorporated
InventorsEric F. Bock, Charles L. Burdick, L. Drake Walsh
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Abstract
A paper coating composition has therein an optical brightening agent (OBA) and a water-soluble non-ionic polysaccharide derivative, exhibiting a solution viscosity in water of less than 1500 cps when dissolved at 5% polymer concentration, wherein the paper coating provides improved optical brightness as compared to the same formulation without said non-ionic, polysaccharide derivative. A paper coated with this composition has an optical brightness value of greater than 70.
Claims34
A paper coating composition comprising an optical brightening agent (OBA) and a low viscosity, non-ionic water soluble polysaccharide derivative, exhibiting a solution Brookfield viscosity in water of less than about 1500 cps when dissolved at 5% polymer concentration at ambient temperature, wherein the paper coating provides improved optical brightness as compared to the same formulation without said non-ionic water soluble, polysaccharide derivative.
Dependencies are inferred from the claim text.