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公开(公告)号：DE69226850T2
公开(公告)日：1999-02-18
申请号：DE69226850
申请日：1992-12-10
Applicant: BRIDGESTONE CORP
Inventor： TORII TAKAYUKI , HARAOKA TAKASHI , NAGAYAMA KATSUHIRO , HATANO HITOMI , FUKUDA NORIYOSHI , ISHINO YUICHI , MARUYAMA TAKAYUKI , SAITO TASUKU
IPC: C01B31/02 , C10M171/00
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公开(公告)号：DE69226850D1
公开(公告)日：1998-10-08
申请号：DE69226850
申请日：1992-12-10
Applicant: BRIDGESTONE CORP
Inventor： TORII TAKAYUKI , HARAOKA TAKASHI , NAGAYAMA KATSUHIRO , HATANO HITOMI , FUKUDA NORIYOSHI , ISHINO YUICHI , MARUYAMA TAKAYUKI , SAITO TASUKU
IPC: C01B31/02 , C10M171/00
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公开(公告)号：DE69024268T2
公开(公告)日：1996-08-22
申请号：DE69024268
申请日：1990-07-05
Applicant: KAWASAKI STEEL CO , BRIDGESTONE CORP
Inventor： FUKUDA NORIYOSHI , NAGAYAMA KATSUHIRO , TORII TAKAYUKI , HATANO HITOMI , ISHINO YUICHI , MARUYAMA TAKAYUKI C O RESEARCH , SAITO TASUKU C O RESEARCH AND
IPC: C10M125/02 , C01B31/02 , C10M171/00 , C10N20/06 , C10N40/14 , C10N70/00
Abstract: Electrorheological fluids display swift and reversible increase in apparent viscosity under application of an electric potential difference to the fluid, and are composed generally of electrical insulating oily medium and dielectric fine-particles dispersed therein. The object of the present invention is to provide a carbonaceous powder for electrorheological fluid which can be employed as dielectric fine-particles to be dispersed in the oily medium and a method of making the carbonaceous powder. The carbonaceous powder for electrorheological fluid of the present invention comprises a carbonaceous powder having a number ratio of carbon atoms to hydrogen atoms (C/H) of 1.70-3.50 and 0.5-13.0% weight loss in a temperature range of 400 DEG C to 600 DEG C during heating the carbonaceous powder under nitrogen atmosphere from room temperature.
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公开(公告)号：CA2020679A1
公开(公告)日：1991-01-07
申请号：CA2020679
申请日：1990-07-06
Applicant: KAWASAKI STEEL CO , BRIDGESTONE CORP
Inventor： FUKUDA NORIYOSHI , NAGAYAMA KATSUHIRO , TORII TAKAYUKI , HATANO HITOMI , ISHINO YUICHI , MARUYAMA TAKAYUKI , SAITO TASUKU
IPC: C10M125/02 , C01B31/02 , C10M171/00 , C10N20/06 , C10N40/14 , C10N70/00
Abstract: Electrorheological fluids display swift and reversible increase in apparent viscosity under application of an electric potential difference to the fluid, and are composed generally of electrical insulating oily medium and dielectric fine-particles dispersed therein. The object of the present invention is to provide a carbonaceous powder for electrorheological fluid which can be employed as dielectric fine-particles to be dispersed in the oily medium and a method of making the carbonaceous powder. The carbonaceous powder for electrorheological fluid of the present invention comprises a carbonaceous powder having a number ratio of carbon atoms to hydrogen atoms (C/H) of 1.70-3.50 and 0.5-13.0% weight loss in a temperature range of 400 DEG C to 600 DEG C during heating the carbonaceous powder under nitrogen atmosphere from room temperature.
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公开(公告)号：CA2020679C
公开(公告)日：2000-05-30
申请号：CA2020679
申请日：1990-07-06
Applicant: BRIDGESTONE CORP , KAWASAKI STEEL CO
Inventor： HATANO HITOMI , TORII TAKAYUKI , NAGAYAMA KATSUHIRO , FUKUDA NORIYOSHI , SAITO TASUKU , MARUYAMA TAKAYUKI , ISHINO YUICHI
IPC: C10M125/02 , C01B31/02 , C10M171/00 , C10N20/06 , C10N40/14 , C10N70/00 , H01B3/26
Abstract: Electrorheological fluids display swift and reversible increase in apparent viscosity under application of an electric potential difference to the fluid, and are composed generally of electrical insulating oily medium and dielectric fine-particles dispersed therein. In one of its aspects, the present invention relates to a carbonaceous powder for electrorheological fluid which can be employed as dielectric fine-particles to be dispersed in the oily medium and a method of making the carbonaceous powder. The carbonaceous powder for electrorheological fluid of the present invention comprises a carbonaceous powder having a number ratio of carbon atoms to hydrogen atoms (C/H) of 1.70-3.50 and 0.5-13.0% weight loss in a temperature range of 400.degree.C to 600.degree.C during heating the carbonaceous powder under nitrogen atmosphere from room temperature.
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Patent Agency Ranking
公开(公告)号：DE69024268D1
公开(公告)日：1996-02-01
申请号：DE69024268
申请日：1990-07-05
Applicant: KAWASAKI STEEL CO , BRIDGESTONE CORP
Inventor： FUKUDA NORIYOSHI , NAGAYAMA KATSUHIRO , TORII TAKAYUKI , HATANO HITOMI , ISHINO YUICHI , MARUYAMA TAKAYUKI C O RESEARCH , SAITO TASUKU C O RESEARCH AND
IPC: C10M125/02 , C01B31/02 , C10M171/00 , C10N20/06 , C10N40/14 , C10N70/00
Abstract: Electrorheological fluids display swift and reversible increase in apparent viscosity under application of an electric potential difference to the fluid, and are composed generally of electrical insulating oily medium and dielectric fine-particles dispersed therein. The object of the present invention is to provide a carbonaceous powder for electrorheological fluid which can be employed as dielectric fine-particles to be dispersed in the oily medium and a method of making the carbonaceous powder. The carbonaceous powder for electrorheological fluid of the present invention comprises a carbonaceous powder having a number ratio of carbon atoms to hydrogen atoms (C/H) of 1.70-3.50 and 0.5-13.0% weight loss in a temperature range of 400 DEG C to 600 DEG C during heating the carbonaceous powder under nitrogen atmosphere from room temperature.
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公开(公告)号：JPH06228581A
公开(公告)日：1994-08-16
申请号：JP1352893
申请日：1993-01-29
Applicant: KAWASAKI STEEL CO , BRIDGESTONE CORP
Inventor： TAKAGI KO , TORII TAKAYUKI , HARAOKA TAKUJI , NAGAYAMA KATSUHIRO , FUKUDA NORIYOSHI , MARUYAMA TAKAYUKI , OGINO TAKAO , SAITO TASUKU
Abstract: PURPOSE:To provide a carbonaceous powder for use in an electroviscous fluid which powder can bring about a stable satisfactory electroviscous effect when dispersed in an electrical insulating oil to prepare an electroviscous fluid. CONSTITUTION:A powder comprising carbon as the main component for use as fine particles in an electroviscous fluid obtd. by dispersing the fine particles in an oil medium excellent in electrical insulating properties satisfies a condition: log (f1/F0)
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公开(公告)号：JPH03247696A
公开(公告)日：1991-11-05
申请号：JP4241090
申请日：1990-02-26
Applicant: BRIDGESTONE CORP
Inventor： ISHINO YUICHI , MARUYAMA TAKAYUKI , SAITO TASUKU , FUKUDA NORIYOSHI , NAGAYAMA KATSUHIRO , TORII TAKAYUKI
IPC: C01B31/00 , B01J13/00 , C10M125/02 , C10M125/26 , C10N20/06 , C10N40/14 , H01B3/20
Abstract: PURPOSE:To provide the subject powder having long-term stability and temperature stability by dispersing dielectric material fine particles comprising carbonaceous powder in an electrically insulating oily medium, the carbonaceous powder being prepared by allowing carbon to grow on inorganic fine particles as generation nuclei. CONSTITUTION:Dielectric material fine particles comprising carbonaceous powder preferably having a particle diameter of 0.5-5mu and prepared by allowing carbon to grow on generation nuclei comprising the inorganic fine particles of silica, alumina, rutile, aluminum silicate, etc., having an average particle diameter of preferably 0.01-1mu are dispersed in an oily medium such as a spindle oil, a transformer oil, a chlorinated paraffin, a silicone, oil, etc., having a high electrically insulating property to provide the objective carbonaceous powder.
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公开(公告)号：JPH06299181A
公开(公告)日：1994-10-25
申请号：JP4971993
申请日：1993-03-11
Applicant: KAWASAKI STEEL CO , BRIDGESTONE CORP
Inventor： HARAOKA TAKUJI , TORII TAKAYUKI , NAGAYAMA KATSUHIRO , HATANO HITOMI , TAKAGI KO , FUKUDA NORIYOSHI , ISHINO YUICHI , MARUYAMA TAKAYUKI , SAITO TASUKU , OGINO TAKAO
Abstract: PURPOSE:To stably obtain high-quality carbonaceous powder for an electroviscous fluid without any rise in current value in applying a voltage by heat-treating tar, pitch, a resin, etc., regulating a value of carbonization ratio, then suppressing an increase in oxygen content of the resultant product to a specific value or below, pulverizing the prepared product and classifying the powder. CONSTITUTION:An organic compound such as coal-based tar, coal-based pitch, petroleum-based tar, petroleum-based pitch, a resin and a polymer of a condensed aromatic compound is heat-treated to regulate a value of carbonization ratio (C/H) which is the ratio of the number of carbon atoms to that of hydrogen atoms within the range of 2.00 to 3.50. The resultant substance obtained by the heat treatment is then pulverized and classified by suppressing an increase in oxygen content to
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公开(公告)号：JPH06191811A
公开(公告)日：1994-07-12
申请号：JP4962393
申请日：1993-03-10
Applicant: KAWASAKI STEEL CO , BRIDGESTONE CORP
Inventor： HARAOKA TAKUJI , TORII TAKAYUKI , NAGAYAMA KATSUHIRO , HATANO HITOMI , TAKAGI KO , FUKUDA NORIYOSHI , MARUYAMA TAKAYUKI , ISHINO YUICHI , SAITO TASUKU
IPC: C01B31/00 , C10M125/02 , C10N20/06 , C10N30/02 , C10N40/14
Abstract: PURPOSE:To obtain an electroviscous fluid showing a smaller current when an electric field is applied by removing a water content from carbon powder for the electroviscous fluid so that the powder substantially contains no water. CONSTITUTION:This carbon powder for an electroviscous fluid consists of carbonaceous powder substantially containing no water, i.e., low as
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