| http://www.w3.org/ns/prov#value | - Examples of the surface active agents include compounds represented by the following formulae (I) to (V): ##STR1## wherein M is a hydrogen atom, an alkali metal or an alkaline earth metal; R1 is ##STR2## (wherein R3 is an alkyl group having 4 to 20 carbon atoms or an aryl group substituted by an alkyl group having 4 to 20 carbon atoms, and n and m are integers satisfying the relation of 0???n???14
|
