Emulsions containing crosslinked and non-crosslinked silicone polyethers

Abstract

Emulsions are prepared by heating and polymerizing a mixture containing (i) a non-crosslinked silicone polyether; (ii) optionally, a cosurfactant which can be a monohydroxy alcohol, diol, triol, or glycol ether; (iii) an ≡Si—H containing polysiloxane; (iv) a mono-alkenyl polyether; (v) an α,ω-diene, α,ω-diyne, or α,ω-ene-yne; (vi) optionally, a silicone oil such as (a) a low molecular weight linear or cyclic volatile methyl siloxane, or (b) a low molecular weight linear or cyclic volatile or non-volatile alkyl or aryl siloxane; (vii) a platinum catalyst; and (viii) water.

1 . A method of making oil-in-water emulsions comprising mixing (i) 1-50 percent by weight of a non-crosslinked silicone polyether; (ii) 1-50 percent by weight of a cosurfactant selected from the group consisting of monohydroxy alcohols, diols, triols, and glycol ethers; and (iii) 25-97.9 percent by weight of water; with (iv) 0.1-73.0 percent by weight of a crosslinked silicone elastomer containing no oxyalkylene units prepared by reacting (a) an ≡Si—H containing polysiloxane; (b) an α,ω-diene, α,ω-diyne, or α,ω-ene-yne; (c) a silicone oil selected from the group consisting of (I) low molecular weight linear and cyclic volatile methyl siloxanes, and (II) low molecular weight linear and cyclic volatile and non-volatile alkyl and aryl siloxanes; and (d) a platinum catalyst.  
     
     
         2 . A method according to  claim 1  in which the cosurfactant is selected from the group consisting of 1-butanol, 1-pentanol, 1-decanol, 1-hexadecanol, ethylene glycol, propylene glycol, trimethylene glycol, glycerol, and di(ethylene) glycol hexyl ether.  
     
     
         3 . A method according to  claim 1  in which the emulsion is prepared without application of any mechanical shearing force.  
     
     
         4 . An emulsion prepared according to the method defined in  claim 1.