Hydraulic fluids
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United States of America Patent
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app pub date -
Sep 26, 2003
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Oct 13, 1998
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Abstract
The invention relates to compositions comprising an ester of a polyol and a mixture of fatty acids, wherein at least a part (I) of the esterified fatty acids has a chain length of 5-12 carbon atoms and another part (II) of the esterified fatty acids has a chain length of 16-22 carbon atoms, and wherein the composition has a viscosity of 7000 mm 2 /s or less, when tested according to ASTM (D2531). Such compositions have unexpected good low temperature properties, in particular a good rheology after having been kept for a prolonged time at a low temperature (e.g. at -30.degree. C.). These compositions are suitable for use as (part of) hydraulic fluid in applications at low temperatures.
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