| abstract |
PURPOSE: To improve the compatibility with hydrofluorocarbon 134a and the lubricity by incorporation of a specified polyoxyalkylene glycol derivative as an effective constituent. n CONSTITUTION: A 2-4C alkylene oxide (e.g. ethylene oxide) is polymerized in the presence of water and an initiator comprising an alkali hydroxide to give a polyoxyalkylene glycol having terminal hydroxyl groups of formula I (wherein p is 6 to 80; R 2 is 2-4C alkylene), and the terminal hydroxyl groups are methyl- etherified, etc., thus giving a polyoxyalkylene glycol derivative (A) of formula II (wherein R 1 and R 3 are each methyl: m is p) (e.g. a polyoxyalkylene glycol dimethyl ether). Component A is mixed, if necessary, with a polyoxyalkylene derivative (B) having terminal hydroxyl groups in such an amount that the terminal hydroxyl groups account for at most 30mol% of the total terminal groups, thus giving the title lubricating oil having a kinematic viscosity (100°C) of 2-50cSt. n COPYRIGHT: (C)1990,JPO&Japio |