U.S. Pat. No. 5,567,754 claims pigmentary materials, such as titanium dioxide, having deposited thereon a partial ester polyol and unsaturated monocarboxylic acid treating agent corresponding to the formula R(OH)xCOOR???, wherein R is an alkyl or aryl radical containing from about 2 to about 20 carbon atoms, R??? is an unsaturated alkyl radical containing from about 6 to about 20 carbon atoms, and