PROBLEM TO BE SOLVED: To provide an antimicrobial agent having high antimicrobial activity and less irritation in skin, etc.SOLUTION: The antimicrobial agent consisting of a quaternary ammonium salt is expressed by general formula (1), wherein R1 is a 6-24C hydrocarbon group R2 is a 1-24C hydrocarbon group R3 is a 1-5C hydrocarbon group which may be substituted by hydroxy R4 and R5 are each a 2-6C alkylene (n) is a number of 0.3 to 20 (m) is a number of 0.3 to 10 (p) is an integer of 1 to 3 (q) is 1 or 2 (r) and (s) are each an integer of 0 to 2 (p+q+r+s)=4 and A- is an anion. An antimicrobial composition containing the agent is also provided.COPYRIGHT: (C)2009,JPO&INPIT【課題】 高い抗菌活性を有し、皮膚等での刺激性が少ない抗菌剤の提供。【解決手段】 一般式(1)で表される第4級アンモニウム塩からなる抗菌剤、並びにこの抗菌剤を含有する抗菌組成物。【化1】(式中、R1は炭素数6~24の炭化水素基、R2は炭素数1~24の炭化水素基、R3は炭素数1~5のヒドロキシ基で置換されていても良い炭化水素基、R4及びR5は炭素数2~6のアルキレン基、nは0.3~20の数、mは0.3~10の数を示し、pは1~3の整数、qは1又は2、r及びsは0~2の整数で、p+q+r+s=4である。A-はアニオンを示す。)【選択図】 なし
