Organosilicone terpolymers

An organosilicone terpolymer of the formula

• MD.sub.x D.sub.y 'D.sub.z "M
• wherein M, each occurrence, is a end-capping unit of the formula A.sub.3 SiO.sub.1/2 in which A is a monovalent organic radical free of olefinic unsaturation or is hydroxyl bonded directly to the silicon atoms, or M is alkoxy of 1 to 13 carbon atoms,
• D is a unit of the formula R.sub.2 SiO wherein R is a monovalent hydrocarbon radical free of acetylenic unsaturation,
• D' is a unit of the formula RR'SiO wherein R is a monovalent hydrocarbon radical free of acetylenic unsaturation and R' is a polyoxyalkylene unit of the formula --C.sub.n H.sub.2n (OC.sub.2 H.sub.4).sub.a (OC.sub.3 H.sub.6).sub.b OR" in which R" is a hydrogen, acyl of 1 to 8 carbon atoms, or a monovalent hydrocarbon radical of 1 to 13 carbon atoms, n is an integer having an average value from 3 to 8, and a and b are such that the sum of a+b is from 5 to 200 and the quantity a.div.(a+b) is from 0 to 1.0,
• D" is a unit of the formula RR"'SiO wherein R is a monovalent hydrocarbon radical free of acetylenic unsaturation and R"' is a radical of the formula --L--SiR.sub.m ""X.sub.3-m wherein L is a non-hydrolyzable aliphatic hydrocarbon linkage which separates the silicon atoms by at least two carbon atoms, R"" is alkyl of up to 8 carbon atoms, X is hydroxyl or a hydrolyzable group, and m is 2, 1, or 0, and
• x is an integer from 25 to 500, y is an integer from 1 to 2x, and z is an integer from 1 to 2x.