Mineral paper coating compositions containing latex and amphoteric polymer
AssigneeRohm and Haas Company
InventorsRobert A. Gill, Joseph J. Latimer, Arthur D. Jordan, Jr.
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Abstract
Mineral coating compositions for coating papers, the binder of which comprises a negatively-charged latex or an aqueous dispersion of an emulsion polymer, with or without an amylaceous binder, as the major portion thereof, and a relatively small amount of a water-soluble addition polymer having polymerized therein from 20% to 100%, preferably at least 40%, by weight of a monoethylenically unsaturated monomer having a primary, secondary, or tertiary amine group, such as an aminoalkyl acrylate, methacrylate, vinyl ether or vinyl sulfide, an N-aminoalkyl(meth)acrylamide, an N-acryloxyalkyl-oxazolidine or an N-acryloxyalkyl-tetrahydro-1,3-oxazine.
Claims10
In a coating composition adapted to coat papers consisting essentially of an aqueous dispersion of (1) a finely divided pigmentary material comprising a major amount of clay therein and (2) a binder, in an amount of 5 weight percent to 50 weight percent based on pigment weight, comprising (a) a negatively-charged latex polymer free of amine groups with or without another binder material the improvement wherein the binder additionally comprises (b) a water-soluble polymer of 20% to 100% by weight of units containing a monoethylenically unsaturated monomer having a primary, secondary, or tertiary amine group, the amount of (b) being from 0.1% to 10% by weight of the pigment, but not over 18% by weight of binder component (a), the molecular weight of (b) being from about 5000 number average to about 900,000 viscosity average.
Dependencies are inferred from the claim text.