PROBLEM TO BE SOLVED: To provide a process for producing an oil-in-water emulsified cosmetic having a small emulsified particle size and excellent storage stability at high temperature.SOLUTION: According to the present invention, there is provided a method for producing an oil-in-water emulsified cosmetic. The method comprises Step 1: obtaining an emulsified product by mixing (A) one or more selected from organic acid salts represented by formula (A) and fatty acid salts of C 12 to 24, (B) one or more polymer molecules selected from an alkyl-modified polysaccharide-based polymer, a polymer having, as constitutional units, a hydrophilic segment having an N-acylalkyleneimine as a repeating unit and an organopolysiloxane segment, and polyether modified silicone, (C) an oil agent, and (D) a composition containing water and step 2: lowering the pH of the emulsion obtained in step 1. (R1 is a natural sterol having one hydroxyl group or a hydrogenated product thereof or a residue obtained by removing H of a hydroxyl group of a bile acid R2 is a divalent hydrocarbon group of C1 to 25 and M is an alkali metal, an alkaline earth metal, an ammonium ion, an organic ammonium ion, or a basic amino acid)SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】乳化粒子径が小さく、高温での保存安定性に優れた水中油型乳化化粧料の製造方法の提供。【解決手段】以下の工程を有する水中油型乳化化粧料の製造方法。工程1:(A)式で表される有機酸塩及びC12~24の脂肪酸塩から選ばれる1種以上、(B)アルキル変性した多糖類系ポリマー、N-アシルアルキレンイミンを繰り返し単位とする親水性セグメントと、オルガノポリシロキサンセグメントと、を構成単位とするポリマー及びポリエーテル変性シリコーンから選ばれる1種以上の高分子、(C)油剤及び(D)水を含む組成物を混合して、乳化物を得る工程、工程2:工程1で得られた乳化物のpHを下げる工程(R1は1個の水酸基を有する天然ステリン或いはその水素添加物又は胆汁酸の水酸基のHを除いた残基;R2はC1~25の2価の炭化水素基;Mはアルカリ金属、アルカリ土類金属、アンモニウムイオン、有機アンモニウムイオン又は塩基性アミノ酸)【選択図】なし
