| http://www.w3.org/ns/prov#value | - Especially, the polyoxyalkylene alkyl ether prepared by adding an alkylene oxide such as ethylene oxide or propylene oxide to an alcohol having 10 to 18 carbon atoms in an amount of 4 to 20 moles is preferable as the nonionic surfactant, wherein the resulting polyoxyalkylene alkyl ether has an HLB value as calculated by Griffin method of from 10.5 to 15.0, preferably from 11.0 to 14.5.
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