| 摘要 |
A hydraulic fluid that remains solids-free at temperatures as low as about -30 DEG C. and has a pour point as low as about -42 DEG C. comprises a cyclic phosphazene oligomer mixture, the structural formula of each molecule of which contains 3 or 4 units selected at random from the group consisting of <IMAGE> <IMAGE> wherein R is a fluoroalkoxy group -OCH2(CF2)mCF2Z, where Z is hydrogen or fluorine, and m is 0 or an integer from 1 to 10; R' and R'' are different alkoxyalkyloxy groups in which linear or branched C1-12 alkoxy is substituted with linear or branched C1-12 alkoxy; with the proviso that all of R, R' and R'' are present in the oligomer mixture.
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