WATER-BASED COATING COMPOSITION

摘要

The invention provides a water-based coating composition in two pack form comprising: i) in a first pack a substantially non-aqueous solution of a silicon-containing polymer which is soluble in water miscible organic solvents and essentially soluble in aqueous media, the silicon groups on the polymer being of formula (1): -SiR<1>aR3-a in which a is 0 to 2, R<1> is Cl-6 alkyl and R is OH or a hydrolysable group, and ii) in a second pack a polymer in dispersion in an aqueous liquid carrier for the composition, where the non-volatile binder solids content of the composition is at least 5 % by weight and the molar concentration of silicon in the composition is greater than 0 and less than 0.5.