Patent ID: 7019069

Claim:
A resinous water-repellent coating comprising: (A) 100 weight parts of a polyorganosiloxane described by the average formula (R 2 SiO 2/2 )w(RSiO 3/2 )x(SiO 4/2 )y(O 1/2 R′) z , wherein R selected from the group consisting of monovalent hydrocarbon groups having 1 to 10 carbon atoms, R′ is selected from the group consisting of the hydrogen atom and saturated hydrocarbon groups having from 1 to 6 carbon atoms, w is a number from 0 to 0.2, x is a number from 0.4 to 0.9, y is a number from 0.1 to 0.6, z is a number from 0.1 to 0.5, and (w+x+y)=1; (B) 20 to 150 weight parts of an alcohol-based solvent; (C) 100 to 1000 weight parts of a solvent selected from the group consisting of hydrocarbon-based solvents and polydimethylsiloxanes described by formula Me 3 SiO(Me 2 SiO)nSiMe 3 , wherein Me is the methyl group, and n has a value of 0 or 1; (D) 1 to 100 weight parts of a coupling agent selected from the group consisting of alkoxysilanes and silane coupling agents; (E) 0.1 to 20 weight parts of a condensation catalyst, and (F) 0.1 to 20 weight parts of a polyoxyalkylene-modified silicone.