Novel extended polymer surfactants comprising a methoxy-terminated polyethylene glycol hydrophilic block acylated with a hydrophobic moiety comprising a chain of at least two fatty acid units, e.g. an acyloxyacyl group such as 16-hexadecanoyloxyhexadecanoyl, are useful in the preparation of polymer-based gas-containing contrast agents by emulsion techniques.
含有甲氧基端的聚
乙二醇亲
水性块,通过酰化至少两个
脂肪酸单元的疏
水基团(例如16-
十六烷氧基
十六烷酰氧基基团)而形成的新型高分子表面活性剂,在乳化技术中制备基于聚合物的含气造影剂中非常有用。