PROTECTIVE COATING COMPOSITIONS CONTAINING HYDROLYSABLE SILANES

摘要

There is provided a method coating a surface with a protective coating, comprising (i) applying to the surface a composition comprising dispersed in an organic solvent (a) at least one hydrolysable silane having the formula (I) QnSiG4-n, wherein Q represents a hydrocarbon group, G represents a hydrolysable group and n is 0, 1 or 2; (b) at least one polymer A comprising a polysiloxane segment and having a plurality of -SiY functional groups wherein Y represents a hydrolysable group and wherein the amount of hydrolyzable groups Y bonded to Si atoms is on average more than 6 per polymer; or a condensation product of a hydrolysation reaction of (a) or (b) or (a) and (b) with the proviso that the reaction product is such that not all hydrolysable groups have been consumed, (ii) heat-curing the composition. There are also provided substrates and compositions as described above for coating these substrates.