Emulsion compositions comprising a siloxane-oxyalkylene copolymer and an organic surfactant

Claim 1

An emulsion composition consisting essentially of (a) 1 to 70 percent by weight of a polar liquid as a dispersed phase, (b) 17 to 97.5 percent by weight of a non-polar base liquid as a continuous phase, said base liquid having a viscosity at 25° C. of up to 100 millipascal-seconds and being selected from the group consisting of methylsiloxane fluids having the average unit formula (CH 3 ) a SiO.sub.(4-a)2 wherein a has an average value of from approximately 2 to 3 inclusive and mixtures thereof with paraffinic hydrocarbon fluids, (c) 0.5 to 3 percent by weight of an organic water-in-oil surfactant having an HLB value of from 2 to 10 inclusive, and (d) 1 to 10 percent by weight of a polydiorganosiloxanepolyoxalkylene copolymer containing at least one polydiorganosiloxane segment consisting essentially of R b SiO.sub.(4-b)2 siloxane units wherein b has a value of from 0 to 3, inclusive, there being an average value of approximately 2 R groups per silicon for all siloxane units in the copolymer, and R denotes a radical selected from the group consisting of methyl, ethyl, vinyl, phenyl, and a divalent radical bonding a polyoxyalkylene segment to the polydiorganosiloxane segment, at least 95 percent of all R being methyl; and at least one polyoxyalkylene segment having an average molecular weight of at least 1000 and consisting of from 0 to 50 mol percent polyoxypropylene units and from 50 to 100 mol percent polyoxyethylene units, at least one terminal portion of said polyoxyalkylene segment being bonded to said polydiorganosiloxane segment, any terminal portion of said polyoxyalkylene segment not bonded to said polydiorganosiloxane segment being satisfied by a terminating radical; the weight ratio of polydiorganosiloxane segments to polyoxyalkylene segments in said copolymer having a value of from 2 to 8 and the total of (a) plus (b) plus (c) plus (d) being 100 percent by weight.