DE2021779

1,249,803. Hydraulic fluids. CASTROL Ltd. 27 April, 1970 [2 May, 1969], No. 22587/69. Addition to 1,083,324. Heading C5F. Hydraulic fluids comprise a mixture of (A) where R 3 is C 2 -C 4 alkylene, R4, R5, R7 and R8 are each ethylene or propylene, R6 and R9 are each methyl or ethyl and p, q, r and s are integers such that the sum of the carbon atoms in all the groups R4, R5, R7 and R8 is 6-10 and such that if either s or t is zero the other is at least one and if either p or q is zero the other is at least one and (B) C 2 H 5 COO (R10O) l (R11O) m OCC 2 H 5 where R10 and R11 are each ethylene or propylene and I and m are integers such that the sum of the carbon atoms of all the groups R10 and R11 is 5-9. Specified compositions include a mixture of triethylene glycol diproprionate and esters of diethylene glycol monomethyl ether and a mixture of adipic, glutaric and succinic acids. The fluid may also contain polyglycols or ethers thereof, the reaction product of ammonia or an amine with an alkylene oxide, glycol/dibasic acid polyesters (examples given), complex esters, bis(3,4-epoxy-6-methyl-cyclohexylmethyl)- adipate, dibutylamine, benzotriazole, triphenyl phosphite.