Aqueous dispersion of poly(acetal-polyether) and its use in protective coatings

Abstract

An aqueous dispersion includes an associative thickener based on a hydrophobically modified poly(acetal- or ketal-polyether) (HM-PAPE) and at least one viscosity reducing agent selected from ethoxylated alcohols, ethoxylated acetyleneic diols, phosphate esters, dialkyl sulfosuccinates, and mixtures thereof. This aqueous dispersion improves the incorporation of the HM-PAPEs into aqueous based protective coatings. This dispersion also improves water-borne coating compositions that optionally contain latex.

Description

[0001] This application claims the benefit of US Provisional Application No. 60 / 634,500, filed December 9, 2004, and US Provisional Application No. 60 / 636,268, filed December 15, 2004. technical field

[0002] The present invention relates to aqueous dispersions of associative thickeners and at least one surfactant. More specifically, the present invention relates to aqueous dispersions of associative thickeners based on poly(acetal or ketal-polyether) (PAPE) and at least one surfactant selected from the group consisting of Ethoxylates, ethoxylated acetylenic diols, phosphate esters and dialkyl sulfosuccinates. The invention also relates to the use of these aqueous dispersions in aqueous coating compositions. Background technique

[0003] Associative thickeners are generally water-soluble or water-dispersible polymers with a small amount of hydrophobic groups. They are widely used in rheology control and characterization applications of various aqueous systems. A major fi...