| abstract |
(57) [Summary] [Problem] To provide a cosmetic base composition which has good familiarity with skin, and which improves spread and slip. A copolymer obtained by polymerizing a phosphorylcholine-like group-containing (meth) acrylate and a hydrophobic (meth) acrylate as component A is 99.9 to 90. A cosmetic base composition containing 1% by weight and 0.1 to 10% by weight of a humectant as a B component, wherein the constituent molar ratio of the copolymer of the A component is a phosphorylcholine-like group-containing (meth) Acrylic ester: a cosmetic base composition having a hydrophobic (meth) acrylic ester of 50:50 to 97: 3 and a weight average molecular weight of 10,000 to 5,000,000. |