The Sherwin Williams Company

Hyeong-Chan Youn

Madhukar Rao

Revathi R Tomko

Randolph B Krafcik

Paul M Kayima

Anthony B Sharrotta

Anthony F Toussaint

Marianne G DeCapite

This invention relates to polyurethane thickeners having particular utility in paints and coatings comprising the reaction product of an isocyanate functional material, a polyether polyol, and a difunctional hydrophilic endcapping material that is reactive with isocyanates.

Hydrophilically end-capped polyurethane thickeners

Novel thixotropic alkyd resins are obtained by reacting at a temperature of between about 120.degree. C. to about 150.degree. C. for at least one hour (a) at least one alkyd resin and (b) a polyamide comprising the reaction product of: (i) a polycarboxylic acid; (ii) an active hydrogen compound having the formula X.sub.m --R--Y.sub.n, wherein R represents a group containing from 2 to 12 carbon atoms, X and Y are independently selected from primary amino, secondary amino and hydroxy, and m and n are each at least 1 and the sum of (m+n) is at least 2; and (iii) a capping agent comprised of an unsaturated and/or hydroxy functional monocarboxylic acid having from 8 to 22 carbon atom. The thixotropic alkyd resins of the present invention are particularly useful in preparing thixotropic paint and coating compositions having superior leveling and sag resistance.

Thixotropic alkyd resins and the use thereof in coating compositions

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Cleveland, OH, United States of America

Hyeong-Chan Youn