| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new anionic surfactant consisting of a specific compound, useful for cleaning and emulsion polymerization. SOLUTION: This anionic surfactant consists of a compound of the formula RO-(EO)x-(PO)y-(EO)z-A [R is an 8-24C aliphatic hydrocarbon; EO is oxyethylene; PO is oxypropylene; (x) and (z) are each the mean addition number of moles of ethylene oxide, being 1-50; (y) is the mean addition number of moles of propylene oxide, being 1-50; A is a counterion-contg. anion; (EO)x, (PO)y and (EO)z are in block linkage in this order], e.g. C12H25O-(EO)2-(PO)2-(EO)3-SO3Na. This surfactant is obtained, for example, by charging lauryl alcohol and potassium hydroxide into a rotary agitation type autoclave for both ethylene oxide and propylene oxide, followed by temperature rise to effect dehydration, then by charging ethylene oxide into the autoclave to carry out a reaction, followed by charging propylene oxide into the autoclave to carry out a further reaction, and subsequently by neutralizing the reaction product with acetic acid.
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