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Abstract

An aqueous emulsion composition suitable for treating cellulosic or masonry surfaces to render them water repellent is disclosed, said composition comprising: (i) an alkoxysilane of the formula R.sub.n Si(OR').sub.4-n wherein R is an alkyl radical, an alkenyl radical, phenyl, chloropropyl or trifluoropropyl, n is 1 or 2 and R' is an alkyl radical having 1 to 6 carbon atoms; (ii) a silane coupling agent of the formula R'.sub.m R''.sub.p Si(OR').sub.4-m-p wherein R' is selected from the group consisting of amino and quaternary ammonium organofunctional groups, R'' is an alkyl radical having 1 to 4 carbon atoms, R' has its previously defined meaning, m is 1 or 2 and p is 0 or 1, with the proviso that m+p is 2 or less and the molar ratio of said alkoxysilane (i) to said silane coupling agent (ii) is 0.5:1 to 3:1; and (iii) a polyisobutylene polymer, and preferred emulsions of the invention further comprising a wax component.

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First Claim