Patent ID: 8232321

Claim:
An alkylene oxide derivative represented by the below-described general formula (I): Z—{O-[(AO) a -(EO) b ]-R} 2 (I) wherein, Z is the residue obtained by removing hydroxyl groups from the dimer diol; EO is an oxyethylene group; AO is an oxyalkylene group having 3 to 4 carbon atoms; the addition form is block-type; the symbols a and b are respectively the average addition mole numbers of the above-described oxyalkylene group and the oxyethylene group and they are 1≦2 a≦150 and 1≦2 b≦150; the percentage of the oxyethylene groups with respect to the sum of the oxyalkylene groups having 3 to 4 carbon atoms and the oxyethylene groups is 10 to 99 mass %; and Rs may be either identical to or different from each other and they are hydrocarbon groups having 1 to 4 carbon atoms.