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): (1) -SiR1aR3-a in which a is 0 to 2, R1 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.
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