Urethanes modified with siloxanes

Claim 1

A homogeneous polymeric dispersion comprising a. 55 to 99 parts by weight of a curable urethane composition; b. 1 to 45 parts by weight of a fluid which is incompatible with the urethane composition, said fluid having a viscosity not exceeding 20,000,000 cs. at 25° C., wherein (a) + (b) is equal to 100 parts, c. 1 to 20 weight percent based on the weight of (b) of a dispersing agent capable of maintaining (b) dispersed in (a), said dispersing agent being a siloxane-organic copolymer selected from the group consisting of 1. siloxane-organic copolymers consisting essentially of SiO 2 units, (CH 3 ) 3 SiO 1/2 units and D(CH 3 ) 2 SiO 1/2 units in which D is a polyoxyethylene polymer having a molecular weight of at least 500, or a polyoxyethylenepolyoxypropylene copolymer having a molecular weight of at least 2,500 and the polyoxypropylene portion constitutes up to 50 mole percent of the organic portion of the copolymer, said D being attached to the silicon atom via a silicon-carbon bond, the ratio of the SiO 2 units to the total (CH 3 ) 3 SiO 1/2 and D(CH 3 ) 2 SiO 1/2 units being in the range of 1.0:0.4 to 1.0:1.2, 2. copolymers which are reaction products derived from heating a mixture of a siloxane consisting essentially of SiO 2 units and (CH 3 ) 3 SiO 1/2 units in which the ratio of SiO 2 units to (CH 3 ) 3 SiO 1/2 units is in the range of 1.0:0.4 to 1.0:1.2, and a hydroxylated polyoxyethylene polymer having a molecular weight of at least 500 or a hydroxylated polyoxyethylene-polyoxypropylene copolymer having a molecular weight of at least 2,500 and the polyoxypropylene constitutes up to 50 moles percent of the organic portion of the copolymer, 3. polydimethylsiloxane-organic copolymers in which the polydimethylsiloxane portion has a molecular weight of at least 1400 and the organic portion consists essentially of a polyoxyethylene polymer having a molecular weight of at least 500, or a polyoxyethylene-polyoxypropylene copolymer having a molecular weight of at least 1,000 and the polyoxypropylene constitutes up to 50 mole percent of the organic portion of the copolymer, said organic portion being attached to silicon atoms via silicon-carbon bonds, and 4. polydimethylsiloxane-organic copolymers which are reaction products produced by heating a mixture of hydroxylated polydimethylsiloxanes having a molecular weight of at least 1400, and a hydroxylated polyoxyethylene polymer having a molecular weight of at least 500, or a hydroxylated polyoxyethylene-polyoxypropylene copolymer having a molecular weight of at least 1,000 and the polyoxypropylene constitutes up to 50 mole percent of the organic portion of the copolymer.