Water repellent compositions

US5421866A · kind A · utility

Assignee

• Dow Corning Corporation · US

Inventors

• Lori Ann Stark-Kasley · Midland, US
• Paul J. Popa · Auburn, US
• Thomas M. Gentle · Saint Michael, US
• Dale E. Hauenstein · Midland, US
• Linda Denise Kennan · Midland, US

Key dates

• Filing date: May 16, 1994
• Grant date: Jun 6, 1995
• Expiry date: May 16, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/27
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An aqueous emulsion composition suitable for treating cellulosic or masonry surfaces to render them water repellent is disclosed, said composition comprising: PA1 (i) an alkoxysilane of the formula EQU 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; PA1 (ii) a silane coupling agent of the formula EQU 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.