公开(公告)号：DE68910790D1

公开(公告)日：1993-12-23

申请号：DE68910790

申请日：1989-11-24

Applicant: BRIDGESTONE CORP

Inventor： FUKUYAMA YOSHIKI ,  ISHINO YUICHI ,  OSAKI TOSHIYUKI ,  MARUYAMA TAKAYUKI ,  SAITO TASUKU

IPC: B01J13/00 ,  C10M125/26 ,  C10M171/00

公开(公告)号：DE68902734T2

公开(公告)日：1993-01-14

申请号：DE68902734

申请日：1989-11-29

Applicant: BRIDGESTONE CORP

Inventor： FUKUYAMA YOSHIKI ,  ISHINO YUICHI ,  OSAKI TOSHIYUKI ,  MARUYAMA TAKAYUKI ,  SAITO TASUKU

IPC: C10M169/04 ,  C10M125/26 ,  C10M171/00 ,  C10N10/06 ,  C10N20/02 ,  C10N20/06 ,  C10N30/02 ,  C10N40/06 ,  C10N40/14

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：DE69133162T2

公开(公告)日：2003-07-24

申请号：DE69133162

申请日：1991-04-11

Applicant: BRIDGESTONE CORP

Inventor： KURACHI YASUO ,  SAITO TASUKU ,  FUKUYAMA YOSHIKI ,  ENDO SHIGEKI

IPC: C10M171/00 ,  H01B1/04 ,  H01B1/18 ,  H01B1/24 ,  H01B1/06 ,  H01B1/08

Abstract: A powder having good oxidation resistance and controlled electrical properties is obtained by dispersing minute particulates in a matrix phase to form composite particles. The minute particulates may be distributed uniformly, or non-uniformly such that the particulates are dense near the particle surface and sparse near the centre or vice versa. The minute particulates have a moderate conductivity of from 10 to 10 Scm , and the matrix phase has a low conductivity of up to 1/10 of that of the particulates. The powder can be dispersed in an insulating oily medium to form an electrorheological fluid.

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：DE69128846T2

公开(公告)日：1998-08-06

申请号：DE69128846

申请日：1991-04-11

Applicant: BRIDGESTONE CORP

Inventor： KURACHI YASUO ,  SAITO TASUKU ,  FUKUYAMA YOSHIKI ,  ENDO SHIGEKI

IPC: C10M171/00 ,  H01B1/04 ,  H01B1/18 ,  H01B1/24 ,  H01B1/08 ,  H01B1/06

Abstract: A powder having good oxidation resistance and controlled electrical properties is obtained by dispersing minute particulates in a matrix phase to form composite particles. The minute particulates may be distributed uniformly, or non-uniformly such that the particulates are dense near the particle surface and sparse near the centre or vice versa. The minute particulates have a moderate conductivity of from 10 to 10 Scm , and the matrix phase has a low conductivity of up to 1/10 of that of the particulates. The powder can be dispersed in an insulating oily medium to form an electrorheological fluid.

公开(公告)号：AT83795T

公开(公告)日：1993-01-15

申请号：AT89115820

申请日：1989-08-28

Applicant: BRIDGESTONE CORP

Inventor： ISHINO YUICHI ,  OSAKI TOSHIYUKI ,  ENDO SHIGEKI ,  TOMITA SEISUKE ,  MARUYAMA TAKAYUKI ,  FUKUYAMA YOSHIKI ,  SAITO TASUKU

IPC: C10M171/00

公开(公告)号：AU628863B2

公开(公告)日：1992-09-24

申请号：AU4255289

申请日：1989-10-04

Applicant: BRIDGESTONE CORP

Inventor： ISHINO YUICHI ,  OSAKI TOSHIYUKI ,  ENDO SHIGEKI ,  TOMITA SEISUKE ,  MARUYAMA TAKAYUKI ,  FUKUYAMA YOSHIKI ,  SAITO TASUKU

IPC: C10M171/00 ,  C10M171/06 ,  H01B3/46

公开(公告)号：DE69133162D1

公开(公告)日：2003-01-02

申请号：DE69133162

申请日：1991-04-11

Applicant: BRIDGESTONE CORP

Inventor： KURACHI YASUO ,  SAITO TASUKU ,  FUKUYAMA YOSHIKI ,  ENDO SHIGEKI

IPC: C10M171/00 ,  H01B1/04 ,  H01B1/18 ,  H01B1/24 ,  H01B1/06 ,  H01B1/08

Abstract: A powder having good oxidation resistance and controlled electrical properties is obtained by dispersing minute particulates in a matrix phase to form composite particles. The minute particulates may be distributed uniformly, or non-uniformly such that the particulates are dense near the particle surface and sparse near the centre or vice versa. The minute particulates have a moderate conductivity of from 10 to 10 Scm , and the matrix phase has a low conductivity of up to 1/10 of that of the particulates. The powder can be dispersed in an insulating oily medium to form an electrorheological fluid.

公开(公告)号：DE4442519A1

公开(公告)日：1995-06-08

申请号：DE4442519

申请日：1994-11-30

Applicant: BRIDGESTONE CORP ,  KAWASAKI STEEL CO

Inventor： MARUYAMA TAKAYUKI ,  OGINO TAKAO ,  ISHINO YUICHI ,  SAITO TASUKU ,  HARAOKA TAKASHI ,  TAKAGI KAORI ,  HATANO HITOMI

IPC: C01B31/02 ,  C10C3/00 ,  C10M125/02 ,  C10M169/04 ,  C10M171/00 ,  C10N20/00 ,  C10N20/02 ,  C10N20/06 ,  C10N40/14 ,  C10N70/00 ,  C01B31/00 ,  H01B1/20 ,  C10M159/12

Abstract: Carbon powder intended to be dispersed in an electrorheological (ER) fluid has an oxygen content above 10 wt.% but \} 20 wt.%, has an average particle dia. of 0.01-100 microns, and is produced by: (a) thermal polymerisation of a condensed polycyclic aromatic material, contg. naphthalene as major component, in the presence of an HF/BF3 catalyst to produce a 100% mesophase pitch with a softening point of 150-400 deg C.; (b) heat treatment of the pitch in an oxidising atmos. at a temp. which is not above the m.pt. of the pitch, not below 50 deg C. and not above 400 deg C., to produce a pitch with an oxygen content of 12-25 wt.%; and (c) carbonisation of the pitch in an inert gas atmos. at 300-700 deg C.. Also claimed is an ER fluid comprising 1-60 wt.% of a carbon powder as above dispersed in 40-99 wt.% of an insulating oil with a viscosity of 0.65-1000 cS at room temp..