WATER-BASED COATINGS WITH IMPROVED SOLVENT OR WATER POPPING AND SAGGING CHARACTERISTICS

摘要

This invention relates to water-based coating compositions in which solvent or water popping and sagging are eliminated or at least substantially reduced. The composition comprises a thermosetting, filmforming organic binder dispersed in an aqueous medium containing from 60 to 100 parts by weight of water and 0 to 40 parts by weight of a volatile organic solvent. The organic binder is formulated from ( ) an acid-containing interpolymer adapted to be dissolved or dispersed in water with the aid of a base and (b) a water-soluble or water-dispersible polyether polyol or polyester polyol having a molecular weight of at least 300. The interpolymer consists essentially of the interpolymerization product of an N-alkoxyalkyl-substituted amide, an alpha, beta-ethylenically unsaturated carboxylic acid, and at least one other monomer containing a group. The properties of coatings formed from the compositions can be further enhanced if desired by incorporating (c) a water-soluble or waterdispersible aldehyde condensation resin into the organic binder.