Patent ID: 9701590
Date: 2017-07-11
CPC Classifications: C04B,C08G,C08L,Y02W

Claim:
1. A water repellent composition for treating porous substrates comprising an emulsion which includes water, at least one surfactant, and a siloxane copolymer having the formula wherein R is an alkyl radical having 1 to 3 carbon atoms; a has a value of from 1 to 12; R′ is an alkyl radical having 6 to 12 carbon atoms; b≧2; (a+b) is at least 5; and being substantially free of alkenes; wherein the siloxane copolymer is obtained by reacting an alkene with a linear siloxane containing silicon hydrogen groups at a molar ratio of alkene to SiH groups of at least 0.25:1; wherein the siloxane copolymer is vacuum stripped; and wherein the composition has a Volatile Organic Content according to ASTM D 5095 below 100 g/l.