Compositions – Heat-exchange – low-freezing or pour point – or high boiling... – Organic components
Patent
1974-05-20
1976-10-05
Pitlick, Harris A.
Compositions
Heat-exchange, low-freezing or pour point, or high boiling...
Organic components
252 498, C10M 340
Patent
active
039843408
ABSTRACT:
A functional fluid composition consisting essentially of (1) a phosphate ester containing at least two alkyl groups such as tributyl phosphate or dibutyl phenyl phosphate, in combination with a phosphate ester containing at least two aromatic groups, such as n-butyl diphenyl phosphate or tricresyl phosphate, (2) a combination of at least two polyalkylene glycol materials, e.g. two polypropylene glycol ethers having substantially different molecular weights, and (3) a small amount of an epoxide, in the form of an ester or polyester of 4,5-epoxy-1,2-cyclohexane dicarboxylic acid, e.g., poly(ethylene-.DELTA..sup.4 -epoxy tetrahydrophthalate), such epoxide preventing acid build-up in the fluid, and preventing undesirable deposits particularly when such fluid is employed as an aircraft hydraulic fluid.
REFERENCES:
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patent: 2566623 (1951-09-01), Moreton
patent: 2636861 (1953-04-01), Watson
patent: 2659699 (1953-11-01), George et al.
patent: 2853498 (1958-09-01), Phillips et al.
patent: 2853499 (1958-09-01), Phillips et al.
patent: 3637507 (1972-01-01), Gentit
patent: 3723320 (1973-03-01), Herber et al.
patent: 3783132 (1974-01-01), Herber
Geldin Max
McDonnell Douglas Corporation
Pitlick Harris A.
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