Claims
- 1. An electrorheological fluid composition comprising inorganic/organic composite particles dispersed in an electrically insulating medium,
- said inorganic/organic composite particles consisting essentially of a core consisting of an electrically insulating organic polymeric compound and a single shell consisting essentially of microparticles of an electrically semiconducting inorganic material having an electrical conductivity within a range of 10.sup.3 to 10.sup.-11 .OMEGA..sup.-1 /cm at room temperature,
- wherein the electrically semiconducting inorganic material are metal oxides, metal hydroxides, hydroxides of metal oxides, or inorganic ion exchangers, or metal oxides, metal hydroxides, hydroxides of metal oxides, or inorganic ion exchangers which are subjected to metallic doping,
- and wherein the electrically insulating organic polymeric compound is at least one of poly(meth)acrylic ester, (meth)acrylic ester-styrene copolymer, polystyrene, polyethylene, polypropylene, nitrile rubber, butyl rubber, ABS resin, nylon, polyvinyl butyrate, ionomer, ethylene-vinyl acetate copolymer, vinyl acetate resin, or polycarbonate resin.
- 2. An electrorheological fluid composition according to claim 1, wherein said inorganic/organic composite particles are produced by a method in which cores and shells thereof are formed simultaneously by one of emulsion polymerization, suspension polymerization, or dispersion polymerization in the presence of said electrically semiconducting inorganic microparticles.
- 3. An electrorheological fluid composition according to claim 2, wherein said inorganic/organic composite particles have polished surfaces.
- 4. An electrorheological fluid composition according to claim 1, wherein said microparticles of an electrically semiconducting inorganic material consist of a support member coated with said electrically semiconducting inorganic material, thereby forming at least a surface of said electrically semiconducting inorganic material on said support member.
- 5. An electrorheological fluid composition according to claim 4, wherein said inorganic/organic composite particles are produced by a method in which cores and shells thereof are formed simultaneously by one of emulsion polymerization, suspension polymerization, or dispersion polymerization in the presence of said electrically semiconducting inorganic microparticles.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-175706 |
Jul 1993 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/286,414, filed Jul. 13, 1994, now abandoned.
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0394049 |
Oct 1990 |
EPX |
0455362A2 |
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0562978 |
Sep 1993 |
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63-97694 |
Apr 1988 |
JPX |
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Continuations (1)
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Number |
Date |
Country |
Parent |
286414 |
Jul 1994 |
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