| abstract |
A ratio Mz / Mw of a weight average molecular weight (Mw) and a z average molecular weight (Mz) represented by the formula (1) and calculated from a chromatogram obtained by gel permeation chromatography measurement is the formula (2). An alkylene oxide derivative that satisfies the relationship. Z- [O- (PO) a- (PO) b / (EO) c ] -H] n ... (1) (Z represents a residue obtained by removing all hydroxyl groups from a compound having 1 to 24 carbon atoms and 1 to 6 hydroxyl groups, n represents a number of 1 to 6, PO represents an oxypropylene group, and EO indicates an oxyethylene group, a and b indicate the number of added moles of PO, respectively, a indicates a number of 1 to 100, b indicates a number of 1 to 100, and c indicates a number of 1 to 200. a + b + c ≧ 10 and b / c = 1/5 to 5/1, and (PO) b / (EO) c indicates that PO and EO are randomly added, and the random rate x of PO and EO is 0. .1 ≦ x ≦ 1.) 5 ≤ M z / M w ≤ 60 ... (2) [Selection diagram] Fig. 1 |