| 摘要 |
An electro-rheological fluid which comprises a solid particulate substance contained in a hydrophobic vehicle which is liquid at atmospheric pressure at least at temperatures below 50 DEG C. and which comprises a compound of the formula: (X)n-Ar[Q-Z]p wherein: Ar represents an aromatic nucleus; Q represents an oxygen or a sulphur atom, or a group of the formula CY1Y2, SO, SO2, SiF2, -OSi(Y1Y2)O- in which Y1 and Y2, which may be the same or different, each represents a halogen or a fluorine atom or an alkyl group; X represents a halogen atom, or a nitro group, a thio(substituted or unsubstituted hydrocarbyl) group or a substituted or unsubstituted hydrocarbyl group; Z represents a substituted or unsubstituted aliphatic or alicyclic group; and n and p, which may be the same or different, each represent a number of at least 1, (n+p) not being greater than the total number of substituted sites on the aromatic nucleus, with the proviso that, where n is greater than 1, not all the n X groups need be the same and that the, or at least one of the, X group(s) represents a halogen atom; and that, where p is greater than 1, not all the pQ groups nor the pZ groups need to be the same.
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