Rohm and Haas Company

Deborah Gay Fradkin

Tao Wang

James Charles Bohling

Ralph Craig Even

Wei Gao

John Michael Friel

Steven Scott Edwards

John William Hook, Iii

Caren A Puschak

Matthew Stewart Gebhart

Bonnie Elizabeth Baker

Cindy Eckert

The present invention relates to a process comprising the steps of a) contacting an aqueous dispersion of a TiOslurry containing adsorbing dispersant with an adsorbing latex to form a mixture, wherein the pH of the mixture of the TiOslurry and adsorbing latex are sufficiently high to inhibit interaction between the TiOand the adsorbing latex; then b) lowering the pH of the mixture of step a) sufficiently to promote interaction between the TiOand the adsorbing latex, thereby forming a composite. The process of the present invention provides for improved hiding and reduced grit for coatings compositions.

Process for improving hiding efficiency in pigmented paints

An aqueous polymer blend composition including a predominant amount of soft polymer particles and a minor amount of hard polymer particles is provided. The soft polymer particles contain, as copolymerized units, 70 to 99.7% by weight monoethylenically unsaturated (meth)acrylic monomer and from 0.3 to 10% by weight monoethylenically unsaturated acid monomer, based on weight of soft polymer particles. The soft polymer particles are made by a select process including redox polymerization or polymerization in the presence of excess unreacted monomer. The aqueous polymer blend composition is useful for preparing dry coatings having improved dirt pickup resistance and acceptable scrub resistance. A method is provided for preparing a dry coating from the aqueous polymer blend composition.

Aqueous polymer blend composition

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Horsham, PA, United States of America

Deborah Gay Fradkin