PROBLEM TO BE SOLVED: To provide antisepsis antimicrobial agents for cosmetics exerting antisepsis antimicrobial effect higher than conventional antisepsis antimicrobial agents.SOLUTION: An antisepsis antimicrobial agent for cosmetics comprising a copolymer is provided, characterized by that the copolymer has a structural unit (a) derived from an amino group-containing monomer (A), and a structural unit (b) derived from a hydrophobic monomer (B), the weight average molecular weight is 4000 to 200,000, and the amino group-containing monomer (A) is a predetermined structure (but excluding ethylene, and polyalkylene glycol monomer represented by a predetermined structure, from monomer components).SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】 従来の防腐抗菌剤よりも高い防腐抗菌効果を発揮する化粧料用防腐抗菌剤を提供する。【解決手段】 共重合体を含む化粧料用防腐抗菌剤であって、該共重合体は、アミノ基含有単量体(A)由来の構造単位(a)と疎水性単量体(B)由来の構造単位(b)とを有し、重量平均分子量が4000~20万であり、該アミノ基含有単量体(A)は、所定の構造である(但し、単量体成分からエチレン、及び、所定の構造で表されるポリアルキレングリコール系単量体を除く。)ことを特徴とする化粧料用防腐抗菌剤。【選択図】なし
