PROBLEM TO BE SOLVED: To provide an antimicrobial agent having high antimicrobial activity and less irritation to 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 and R3 are each a 1-24C hydrocarbon group which may be substituted by hydroxy R4 is a 1-3C aliphatic hydrocarbon group which may be substituted by hydroxy R5 is a 1-5C alkylene (p) is an integer of 1 to 3 (q) and (r) are each an integer of 0 to 2 (s) is an integer of 1 to 3 (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、並びにそ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及びR3は炭素数1~24のヒドロキシ基で置換されていても良い炭化水素基、R4は炭素数1~3のヒドロキシ基で置換されていても良い脂肪族炭化水素基、R5は炭素数1~5のアルキレン基を示し、pは1~3の整数、q及びrは0~2の整数、sは1~3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
