| 摘要 |
An aqueous microbicidal composition of a pH below 6 contains a long-chain alkyl ester of general formula (I), wherein R<I>, R<II? and R?III> are hydrogen or lower alkyl groups, R<IV> is a long-chain alkyl group with 10-18 carbon atoms, R<V> is hydrogen or a group of formula (II) R<VI> N<+> H3, wherein R<VI> is an alkylene group with 3-4 carbon atoms, A is a monovalent counter-ion, and n is the number of cationic groups in the ester compound, and a nonionic aqueous cellulose ether. The microbicidal composition has a prolonged microbicidal effect and an improved viscosity at elevated temperature. The microbicidal effect and the improved viscosity are lost when the pH value is raised. Preferably, the cellulose ether is an ethyl hydroxyethyl cellulose having a cloud point of 30-35 DEG C and a viscosity of 30-400 cP in a 1 % water solution, as measured according to Brookfield LV, 12 rpm at 20 DEG C. |
