Rohm and Haas Company

Meredith Ann Morgan

William D Emmons

William Christopher Finch

Kathleen Anne Koziski

Mark Alan Kesselmayer

Frederick Paul Hinz

Lori Branham Pfahler

Fergus Stuart McColl

Anne Margaret Bacho

The open time of a cementitious composition, such as a grout, may be increased by the incorporating therein, as a binder, a polymer composition comprising a film-forming copolymer formed by polymerization of a monomer mixture comprising 1 to 3% of at least one monomer selected from the group of monomers consisting of amides of &agr;,&bgr;-unsaturated C to C carboxylic acids and at least one hydroxy-(C to C )alkyl (meth)acrylate monomer, wherein the total amount of these monomers is from 2 to 7.5% by weight of said monomer mixture.

Polymer compositions

Coatings compositions including stable composite latex-pigment particles are prepared by dispersing titanium dioxide pigment particles in a first aqueous medium and preparing a dispersion of selected polymeric latex particles, which have at least one dihydrogen phosphate functional group, in a second aqueous medium. The media are mixed and the selected polymeric latex particles adsorb on the titanium dioxide particles. Dibasic phosphate is then provided to the mixture to stop adsorption and stabilize the composite particles. The coating composition gives a coating with improved hiding.

Process for controlling adsorption of polymeric latex on titanium dioxide

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Lansdale, PA, United States of America

Meredith Ann Morgan