Paper/paper laminate-opacifying TiO.sub.2 particulates
AssigneeRhone-Poulenc Chimie
InventorsBernard Gerard, Remy Lorang, Anny Mazzacavallo
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Abstract
Unique titanium dioxide (TiO.sub.2) particulates have an especially high physicochemical affinity for cellulosic fibers and, thus, are well suited as opacifying pigments for paper and paper laminates, and include a zeta potential-adjusting amount of at least one cationic polymer, e.g., a polymer of a quaternary ammonium, sulfonium or phosphonium salt or a copolymer of acrylamide with a cationic comonomer, fixed to the face surfaces thereof.
Claims13
A method for making a paper substrate comprising preparing an opacifying agent by fixing at least one cationic polymer to the surface of titanium dioxide particulates, drying said particulates after depositing said at least one cationic polymer on the surface of the particulates, then forming a suspension of said opacifying agent and cellulosic fibers, and converting said suspension into a substrate, wherein said cationic polymer deposited on the surface of the particulates is a copolymer of an acrylamide and a cationic monomer or a homopolymer of diallyldialkylammonium chloride.
Dependencies are inferred from the claim text.