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：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..

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