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US 5,683,615 AGranted
Magnetorheological fluid
AssigneeLord Corporation
InventorBeth C. Munoz
Life of this patent
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Abstract
A magnetorheological fluid that includes magnetic-responsive particles, a carrier fluid and at least one thiophosphorus and/or thiocarbamate additive. Preferably, the thiophosphorus or thiocarbamate additive is a metallic dialkyldithiophosphate or a metallic dialkyldithiocarbamate.
Claims44
A magnetorheological fluid comprising magnetic-responsive particles, a carrier fluid and at least one thiophosphorus additive having a structure represented by:
- ##STR4## wherein R.sup.3 is selected from the group consisting of a metallic ion, a non-metallic moiety and a divalent moiety;
- a and b are each individually 0 or 1, provided a+b is at least equal to 1;
- x is an integer from 1 to 5 depending upon the valence number of R.sup.3 ;
- and R.sup.1 and R.sup.2 each individually have a structure represented by
- Y--((C)(R.sup.4)(R.sup.5)).sub.n --(O).sub.w --
- wherein Y is selected from the group consisting of hydrogen, amino, amido, imido, carboxyl, hydroxyl, carbonyl, oxo and aryl;
- n is an integer from 2 to 17;
- R.sup.4 and R.sup.5 can each individually be hydrogen, alkyl or alkoxy;
- and
- w is 0 or 1.
7 more elements
A magnetorheological fluid comprising magnetic-responsive particles, a carrier fluid and at least one thiocarbamate additive having a structure represented by:
- ##STR6## wherein R.sup.3 is selected from the group consisting of a metallic ion, a non-metallic moiety and a divalent moiety;
- a and b are each individually 0 or 1, provided a+b is at least equal to 1;
- x is an integer from 1 to 5 depending upon the valence number of R.sup.3 ;
- and R.sup.1 and R.sup.2 each individually have a structure represented by
- Y--((C)(R.sup.4)(R.sup.5)).sub.n --
- wherein Y is selected from the group consisting of hydrogen, amino, amido, imido, carboxyl, hydroxyl, carbonyl, oxo and aryl;
- n is an integer from 2 to 17;
- and
- R.sup.4 and R.sup.5 can each individually be hydrogen, alkyl or alkoxy.
6 more elements
Dependencies are inferred from the claim text.