Patent ID: 6706798
Filing Date: 2004-03-16
Classification: C09D

Abstract:
A water repellent silicone coating agent composition comprising(A) 100 parts by weight of diorganopolysiloxane having a viscosity of 20 to 20,000 mPaÂ·s at 25Â° C. in which the terminal ends of the molecular chain are blocked by silanol groups or silicon-bonded hydrolyzable groups, (B) 5 to 100 parts by weight of a cross-linking agent represented by general formula RaSiX4-a in which R is a monovalent hydrocarbon group comprising 1 to 10 carbon atoms, X is a hydrolyzable group, and subscript a is an integer of 0 to 2, (C) 0.1 to 20 parts by weight of a condensation reaction catalyst, (D) 8 to 50 parts by weight of a hydrophobic surface treated dry process silica having a carbon content of 3.7 to 5% by weight and a bulk density of 40 to 99 g/L, or a hydrophobic surface treated dry process silica having a carbon content of 2.7 to 5% by weight and a bulk density of 100 to 300 g/L, (E) 1 to 10 parts by weight of an organic functional silane coupling agent-based adhesion-imparting agent, (F) an organic solvent having a boiling point of 100 to 200Â° C. in an amount of 4 to 100 wt % based on the total of component (A) to component (E), and (G) 1 to 50 parts by weight of a non-reactive silicone fluid having a viscosity of 10 to 10,000 mPaÂ·s at 25Â° C., wherein component (G) is a polydiorganosiloxane that does not contain in its molecule condensation reactive groups, and wherein aralkyl groups constitute 2 to 40% of the total amount of silicon-bonded organic groups of component(G).