申请人:THE DOW CHEMICAL COMPANY
公开号:EP0080530A1
公开(公告)日:1983-06-08
Hydraulic fluids having high wet equilibrium reflux boiling points and a good chemical stability, comprising cyano-substituted derivatives of cyclic ketals or acetals of the formula
wherein
R is hydrogen or a monovalent radical selected from branched or linear alkyl and cyano-, hydroxy-, alkoxy-, acyloxy-, siloxy- or organosiloxy-substituted derivatives thereof,
A is a divalent radical selected from alkylene and alkyl-, aryl-, cyano-, hydroxy-, cyanoalkyl-, hydroxyalkyl-, alkoxy-, polyalkoxy-, acyloxy-, siloxy- or organosiloxy-substituted alkylene and
B is a divalent radical selected from branched or linear alkylene and
wherein each R', is hydrogen, methyl or ethyl and m and n are inlegers equal to or greater than 1.
具有较高湿平衡回流沸点和良好化学稳定性的液压油,包括式中的环酮或缩醛的氰基取代衍生物
其中
R 是氢或选自支链或直链烷基及其氰基、羟基、烷氧基、酰氧基、硅氧基或有机硅氧基取代衍生物的单价基、
A 是选自亚烷基和烷基、芳基、氰基、羟基、氰基烷基、羟基烷基、烷氧基、聚烷氧基、酰氧基、硅氧基或有机硅氧基取代的亚烷基的二价基,以及
B 是二价基,选自支链或线性亚烷基,以及
其中每个 R'是氢、甲基或乙基,m 和 n 是等于或大于 1 的同素异形体。