Water repellent agent for glass

In a method for imparting water repellency to a glass surface, said method comprising treating at least a portion of said surface with a water-repellent agent, the improvement wherein said agent consisting essentially of a mixture of:

• (A) 100 parts by weight of an organosilane having the formula
• R.sup.1.sub.a SiX.sub.(4-a)
• wherein R.sup.1 is a monovalent hydrocarbon group having 3 to 20 carbon atoms, X is a hydrolyzable group and a is an integer having a value of 1 to 3;
• and
• (B) 10 to 1,000 parts by weight of a diorganopolysiloxane having a viscosity of 0.65 to 500 centistokes at 25.degree. C. and having the formula ##STR11## wherein R.sup.2 is a monovalent hydrocarbon group having 1 to 6 carbon atoms and n is an integer having a value greater than 0, said agent being free of acid having an acid dissociation index (pKa) below 5.0 and being essentially free of a condensation catalyst.

A glass article having at least one surface, wherein at least a portion of said surface is treated with a blend consisting essentially of a mixture of:

• (A) 100 parts by weight of an organosilane having the formula
• R.sup.1.sub.a SiX.sub.(4-a)
• wherein R.sup.1 is a monovalent hydrocarbon group having 3 to 20 carbon atoms, X is a hydrolyzable group and a is an integer having a value of 1 to 3;
• and
• (B) 10 to 1,000 parts by weight of a diorganopolysiloxane having a viscosity of 0.65 to 500 centistokes at 25.degree. C. and having the formula ##STR12## wherein R.sup.2 is a monovalent hydrocarbon group having 1 to 6 carbon atoms and n is an integer having a value greater than 0,
• said blend being free of acid having an acid dissociation index (pKa) below 5.0 and being essentially free of a condensation catalyst.