Water repellent compositions

An aqueous emulsion comprising:

• (i) an alkoxysilane of the formula
• R.sub.n Si(OR').sub.4-n
• wherein R is selected from the group consisting of alkyl radicals having 1 to 10 carbon atoms, alkenyl radicals having 2 to 8 carbon atoms, phenyl, chloropropyl and 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;
• (iii) a polyisobutylene polymer, wherein from 10 to 300 parts by weight of said polyisobutylene polymer (iii) are used for each 100 parts by weight of said component (i) plus component (ii);
• and
• (iv) a wax, wherein from 5 to 1,500 parts by weight of said wax (iv) are used for each 100 parts by weight of said component (i) plus component (ii).