Water repellent compositions

Details Water repellent compositions Water repellent compositions

C - Chemistry, Metallurgy

09

D

C09D 123/22 (2006.01) C04B 41/49 (2006.01) C04B 41/64 (2006.01) C09D 4/00 (2006.01) C09D 183/08 (2006.01) C09K 3/18 (2006.01)

Patent

CA 2148664

An aqueous emulsion composition suitable for treating cellulosic or masonry surfaces to render them water repellent is disclosed. This composition comprises (i) an alkoxysilane of the formula R n Si(OR')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''m R''' p Si(OR')4-m-p wherein R'' is selected from the group consisting of amino or 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 provisos 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. Preferred emulsions of the invention further comprise a wax component.

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