C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/1811, 31/21,
C08F 2/24 (2006.01) C08F 2/32 (2006.01) C08J 3/09 (2006.01) C09K 8/588 (2006.01)
Patent
CA 1207478
ABSTRACT OF THE DISCLOSURE This invention relates to a self-inverting, stable water-in-oil emulsion and to a process for preparing such an emulsion. The emulsion comprises (1) a discontinuous aqueous phase containing a water- soluble polymer which discontinuous phase is dispersed into a continuous oil phase wherein the emulsion contains an inverting amount of an inverting surfactant and an emulsifying amount of a water-in-oil emulsifier. The invention is characterized in that the emulsion is prepared by polymerizing a water-in-oil emulsion of a water-soluble monomer containing a portion of the inverting surfactant and adding an additional amount of an inverting surfactant to the resultant water-in-oil emulsion of the water soluble polymer subsequent to polymerization. The portion of the inverting surfac- tant added prior to the completion of polymerization is sufficient to increase the degree of inversion when the emulsion is inverted into a continuous aqueous phase but less than that which destabilizes the monomeric precursor or the emulsion of the polymer.
407451
Adaway Timothy J.
Easterly James P. Jr.
Fravel Harold G. Jr.
Smart & Biggar
The Dow Chemical Company
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