| 摘要 |
PURPOSE:To improve emulsion stability, to reduce coloration of emulsion, and to prompt emulsifying velocity by using an ethylene glycol monoalkylethere ester of a styrene-maleic anhydride copolymer as emulsifier. CONSTITUTION:A hydrophobic substance is dispersed or emulsified in an acidic aq. soln. of a partial ethylene glycol monoalkylether ester of a styrene-maleic anhydride copolymer so as to form discontinuous minute particles. Then, initial stage condensation product of melamine-formaldehyde is added thereto to form wall film around said minute particles by causing reaction under acidic condition and heating. Preferred alkyl group of said partial ethylene glycol monoalkylether ester of the styrene-maleic anhydride copolymer is 1-6C alkyl. Further, preferred degree of esterification of said partial ester is <=50% basing on the total number of carbonyl group. By the above-described method, the emulsion stability is improved, the coloration of the emulsion is reduced, and the emulsifying velocity is prompted. |
