Patent ID: 7495116

Claim:
A phospholipid derivative represented by the following general formula (1): wherein Z represents a residue of a compound having 3 to 10 hydroxyl groups; AO represents an oxyalkylene group having 2 to 4 carbon atoms; R 1 CO and R 2 CO independently represent an acyl group having 8 to 22 carbon atoms; X represents hydrogen atom, an alkali metal atom, ammonium or an organic ammonium; “a” represents an integer of 0 to 4; “b” represents 0 or 1; Q represents hydrogen atom or methyl group; m represents an average number of moles of the oxyalkylene group added; and m, k1, k2, and k3 are numbers satisfying the following conditions: 3≦m≦200, 9≦m×(k1+k2+k3)≦1000, 1≦k1≦2, 0≦k2≦9 and 0≦k3≦9, and 3≦k1+k2+k3≦10.