Patent ID: 6348269
Filing Date: 2002-02-19
Classification: C08G,C09D,C23C,Y10T

Abstract:
A composition having improved stability and which, when applied to a substrate and cured, provides an abrasion resistant coating on the substrate having improved adhesion and increased stability to crack formation, comprising: an aqueous-organic solvent mixture containing hydrolysis products and partial condensates of an epoxy functional silane, a disilane, and a carboxylic acid compound, wherein the disilane is represented by the formula (R7O)xR83-xSiâ€”R9yâ€”SiR103-x-(OR11)x: where x is 0, 1, 2, or 3; y is 0 or 1; R8 and R10 are independently selected from the group consisting of H, Cl, Br, an alkyl group containing from about 1 to 10 carbon atoms, a functionalized alkyl group, an alkene group, an aryl group, and an alkylpolyether group; R7 and R11 are selected from the group consisting of H, an alkyl group containing form about 1 to 10 carbon atoms, and an acetyl group; where y is 1, R9 is selected from the group consisting of an alkene group containing from about 1 to 12 carbon atoms, an multivalent saturated hydrocarbon group containing from about 1 to 12 carbon atoms, an alkylenepolyether containing from about 1 to 12 carbon atoms, an aryl group, an alkene substituted aryl group, an alkene group which may contain one or more olefins, O or S; where x is 0, R8 and R10 are selected from the group consisting of Cl and Br; and where y is 0, a direct silicon-silicon bond is provided; wherein the carboxylic acid functional compound is selected from the group consisting of monofunctional carboxylic acids, multifunctional carboxylic acids, multifunctional anhydrides an combinations thereof; and wherein the epoxy functional silane is present in a molar ratio to the disilane of from about 0.05:1 to about 5:1.