Patent ID: 6051562
Filing Date: 2000-04-18
Classification: A01N,A61K,A61Q,B01F

Abstract:
An oil-in-water emulsion comprising:a continuous phase of aqueous liquid and,at least 30% by weight of a discontinuous oil phase which is either hydrophobic liquid which is immiscible with the aqueous liquid or is a solid phase obtained by providing an emulsion in the aqueous liquid of a solution of potentially solid material in the hydrophobic liquid and removing the liquid to convert this solution to a solid phase,and the emulsion is stabilized by 1 to 12% by weight based on the aqueous phase of water-soluble stabilizing material in the aqueous liquid and 0.3 to 10% by weight of the total emulsion of oil-soluble material in the oil phase,wherein the water-soluble stabilizing material is a copolymer of ethylenically unsaturated carboxylic acid water-soluble salt or a quaternary ammonium or hydrogen halide addition salt of an ethylenically unsaturated amine together with water-insoluble monomer comprising C.sub.1 -C.sub.4 alkyl(meth)acrylate and/or styrene and is dissolved in and is more soluble in the aqueous liquid than in the oil phase andthe oil-soluble stabilizing material is a copolymer of ethylenically unsaturated carboxylic acid as free acid or ethylenically unsaturated amine as free base with insoluble monomer comprising fatty alkyl (meth)acrylate and is more soluble in the oil phase than in the aqueous liquid.