| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lubricant which has low foaming properties, does not adversely affect wastewater treatment, and is useful esp. for metal processing by using a polyalkylene glycol phosphate having a short-chain alkyl group and a polyoxyalkylene group having an oxypropylene unit or units. SOLUTION: This ester is a compd. represented by the formula [wherein R1 is a 6C or lower hydrocarbon group; X is OM or R1O-(AO)m; M is H, a metal atom, or ammonium; (AO)m is a polyoxyalkylene having an oxypropylene unit or units; and M is 1 or higher] and pref. has a degree of unsaturation of 0.05 I2/g or lower. A low degree or unsaturation can be obtd. by setting the reaction temp. at 120 deg.C or lower in converting a polyalkylene glycol monoether into a phosphoric ester. When an alkali catalyst is used, the use of an inog. adsorbent is pref. |
