| 摘要 |
A phospholipid derivative, utilizable for modification of liposomes and the like, which is a copolymer containing, as essential component units, a component unit A represented by the formula (1), a component unit B represented by the formula (2A) and/or the formula (2B), and a component unit C represented by the formula (3) [R<SUP>1 </SUP>and R<SUP>2 </SUP>represent hydrogen atom or methyl group, provided that R<SUP>1 </SUP>and R<SUP>2 </SUP>do not simultaneously represent methyl group; R<SUP>3 </SUP>represents a divalent hydrocarbon group having 1 to 3 carbon atoms; AO represents an oxyalkylene group having 2 to 4 carbon atoms; m represents an average molar number of the added oxyalkylene groups and is a number in the range represented as 4<=M<=100; R<SUP>4 </SUP>represents hydrogen atom, a hydrocarbon group or acyl group having 1 to 20 carbon atoms; R<SUP>5</SUP>CO and R<SUP>6</SUP>CO represent an acyl group having 8 to 24 carbon atoms; R<SUP>7 </SUP>represents a divalent hydrocarbon group having 2 to 4 carbon atoms; and X and Y represent hydrogen atom, an alkali metal atom, ammonium or an organic ammonium] wherein a molar ratio of the component unit A relative to a total of the component unit B and the component unit C is from 7/3 to 3/7, and the component unit C is contained at a ratio of from 1 to 4 moles per 1 mole of the copolymer.
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