Magnetorheological fluid
First Claim
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1. A magnetorheological fluid comprising magnetic-responsive particles, a carrier fluid and at least one phosphorus additive, wherein the magnetorheological fluid does not include an organomolybdenum, a thiophosphorus additive or a thiocarbamate additive and the phosphorus additive has a structure represented by formula A:
- ##STR4## wherein R1 and R2 are each independently hydrogen, an amino group or an alkyl group having 1 to 22 carbon atoms;
X, Y and Z are each independently --CH2 --, a nitrogen heteroatom or an oxygen heteroatom, provided that at least one of X, Y or Z is an oxygen heteroatom;
a is 0 or 1; and
n is the valence of M;
provided that if X, Y and Z are each an oxygen heteroatom, M is a salt moiety formed from an amine of the formula B;
##STR5## wherein R3, R4 and R5 are each independently hydrogen or aliphatic groups having 1 to 18 carbon atoms and, if at least one of X, Y or Z is not an oxygen heteroatom, M is selected from the group consisting of a metallic ion, a non-metallic moiety and a divalent moiety, provided that if Z is --CH2 -- then M is a divalent moiety and if Z is a nitrogen heteroatom then M is not an amine of formula B.
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Abstract
A magnetorheological fluid that includes magnetic-responsive particles, a carrier fluid and a phosphorus additive. The magnetorheological fluid does not include an organomolybdenum, a thiophosphorus additive or a thiocarbamate additive.
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21 Claims
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1. A magnetorheological fluid comprising magnetic-responsive particles, a carrier fluid and at least one phosphorus additive, wherein the magnetorheological fluid does not include an organomolybdenum, a thiophosphorus additive or a thiocarbamate additive and the phosphorus additive has a structure represented by formula A:
- ##STR4## wherein R1 and R2 are each independently hydrogen, an amino group or an alkyl group having 1 to 22 carbon atoms;
X, Y and Z are each independently --CH2 --, a nitrogen heteroatom or an oxygen heteroatom, provided that at least one of X, Y or Z is an oxygen heteroatom;
a is 0 or 1; and
n is the valence of M;
provided that if X, Y and Z are each an oxygen heteroatom, M is a salt moiety formed from an amine of the formula B;
##STR5## wherein R3, R4 and R5 are each independently hydrogen or aliphatic groups having 1 to 18 carbon atoms and, if at least one of X, Y or Z is not an oxygen heteroatom, M is selected from the group consisting of a metallic ion, a non-metallic moiety and a divalent moiety, provided that if Z is --CH2 -- then M is a divalent moiety and if Z is a nitrogen heteroatom then M is not an amine of formula B. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- ##STR4## wherein R1 and R2 are each independently hydrogen, an amino group or an alkyl group having 1 to 22 carbon atoms;
Specification