Patent ID: 6103001
Filing Date: 2000-08-15
Classification: C04B

Abstract:
An aqueous emulsion comprising:A) a continuous phase comprising water;B) a discontinuous phase comprising at least 1 nonpolar alkoxysilane, wherein the discontinuous phase forms particles dispersed in the continuous phase; andC) an emulsifier system consisting essentially of(i) a primary surfactant, wherein the primary surfactant is a nonionic emulsifier having an HLB greater than 13, and wherein the primary surfactant is present in the emulsion at a concentration of 0.5 to 3 molecules per 100 square Angstrom of surface area of the particles; and(ii) a cosurfactant, wherein the cosurfactant is a nonionic emulsifier having an HLB less than 11, and wherein the cosurfactant is present in the emulsion at a concentration sufficient to provide 1.5 to 15 molecules per 100 square Angstroms of surface area of the particles; wherein the nonpolar alkoxysilane contains an impurity in an amount of 2.50 wt % or less.