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

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.

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.

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

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.

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.

公开(公告)号：JPH0718264A

公开(公告)日：1995-01-20

申请号：JP16228993

申请日：1993-06-30

Applicant: KAWASAKI STEEL CO ,  BRIDGESTONE CORP

Inventor： HATANO HITOMI ,  HARAOKA TAKUJI ,  FUKUDA NORIYOSHI ,  TAKAGI KO ,  MARUYAMA TAKAYUKI ,  SAITO TASUKU ,  OGINO TAKAO

IPC: C01B31/02 ,  C10C3/10 ,  C10C3/14 ,  C10M125/02 ,  C10N20/06 ,  C10N40/14 ,  C10N70/00

Abstract: PURPOSE:To produce the powder capable of providing an electroviscous fluid which has excellent electroviscous characteristics such as much more stable viscosity and electric current under applied voltage, better responsiveness, and a smaller electric current under applied voltage than the conventional ones. CONSTITUTION:The powder is produced by thermally treating an org. material for the powder, pulverizing and classifying the resultant product, and extracting the resultant carbon powder with at least the same wt. of an arom. solvent to remove light components.

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

IPC: B01J13/00 ,  C01B31/00 ,  C10M125/02 ,  C10N20/00 ,  C10N20/06 ,  C10N40/14

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)

公开(公告)号：JPH08245971A

公开(公告)日：1996-09-24

申请号：JP4846495

申请日：1995-03-08

Applicant: KAWASAKI STEEL CO ,  BRIDGESTONE CORP

Inventor： HATANO HITOMI ,  HARAOKA TAKUJI ,  NAGAYAMA KATSUHIRO ,  TORII TAKAYUKI ,  FUKUDA NORIYOSHI ,  ISHINO YUICHI ,  MARUYAMA TAKAYUKI ,  SAITO TASUKU

IPC: C01B31/02 ,  C10M125/02 ,  C10N10/02 ,  C10N10/06 ,  C10N10/08 ,  C10N10/16 ,  C10N20/06 ,  C10N40/14 ,  C10N70/00

Abstract: PURPOSE: To obtain a carbonaceous powder capable of obtaining an electrorheological fluid having excellent electrorheological characteristics such as a large viscosity change and a small value in an electric current under the application of an electric voltage, and its production. CONSTITUTION: This carbonaceous powder having >=1.70 but

公开(公告)号：JPH0718263A

公开(公告)日：1995-01-20

申请号：JP16229293

申请日：1993-06-30

Applicant: KAWASAKI STEEL CO ,  BRIDGESTONE CORP

Inventor： TAKAGI KO ,  HARAOKA TAKUJI ,  HATANO HITOMI ,  FUKUDA NORIYOSHI ,  MARUYAMA TAKAYUKI ,  SAITO TASUKU ,  OGINO TAKAO

IPC: C01B31/02 ,  C10C3/02 ,  C10C3/10 ,  C10C3/14 ,  C10M125/02 ,  C10N20/06 ,  C10N40/14 ,  C10N70/00

Abstract: PURPOSE:To produce a carbon powder capable of providing an electroviscous fluid which has excellent electroviscous characteristics and a much more stable viscosity under applied voltage than the conventional ones. CONSTITUTION:A carbon powder is produced by thermally treating a tar pitch having a softening point of 80-110 deg.C at 400-500 deg.C to cause optically anisotropic small spherical particles to occur in the pitch, removing the particles from the pitch, thermally treating the residual pitch at the max. temp. of 300-800 deg.C, and adjusting the particle size of the resultant product.