Organosilicone polymers

A polysiloxane-polyoxyalkylene block copolymer having the average formula

• [RSiO3/2].sub.t (R.sub.2 SiO).sub.w (R(R.sup.1)SiO).sub.z [(C.sub.n H.sub.2n O).sub.p R.sup.2 ].sub.v
• wherein:
• R represents a momovalent hydrocarbon radical having from 1 to 10 carbon atoms;
• R.sup.1 represents a cyano-substituted radical of the formula --(O).sub.a R.sup.3 CN wherein R.sup.3 is a bivalent alkylene radical having from 2 to 6 carbon atoms or a bivalent alkyleneoxyalkylene radical having from 4 to 12 carbon atoms, and a has a value of 0 or 1;
• R.sup.2 is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms;
• t has an average value of about 0.8 to about 4;
• w has an average value of about 3 to about 100,
• z has an average value of about 3 to about 20;
• n has a value of from 2 to 4 provided that about 20 to about 65 weight percent of the oxyalkylene units of the polyoxyalkylene chain, (C.sub.n H.sub.2n O).sub.p, is constituted of oxyethylene units;
• p has an average value such that the average molecular weight of the polyoxyalkylene chain is from about 800 to about 6000, and
• v has an average value of about 2 to about 4.