Patent ID: 6379448
Filing Date: 2002-04-30
Classification: C03C

Abstract:
A kit for the preparation of a composition for applying to a siliceous substrate a fluoro polysiloxane layer prepared by polymerizing at least one fluoro silane derivative, which after drying has a chemical resistance of at least 1 minute against the action of an aqeuous solution containing 25% by weight of sodium hydroxide and having a temperature of 25Â° C., and kit comprising a first container containing a first composition and a second container comprising a second composition, the first and second compositions having at least partly to be mixed together for forming a mixture to be applied onto the siliceous substrate, in which the first composition is substantially free of water and acid and comprises 0.1 to 100% by weight fluoro silane and 0 to 99% by weight organic polar solvent system for said fluoro silane, while the second composition comprises at least an organic polar solvent for the fluoro silane, less than 20% water and an acid system, the amount of acid system of the second composition mixed with a part of the first composition being sufficient for the preparation of a mixture with a pH lower than 4 to be applied on the siliceous substrate, said pH being measured at 25Â° C. by using a LiCl electrode with an open sleeve, while the amount of polar solvent in the first and second compositions is sufficient for ensuring substantially the complete dissolution of the fluoro silane derivative.