公开(公告)号：JPH0718282A

公开(公告)日：1995-01-20

申请号：JP16229093

申请日：1993-06-30

Applicant: KAWASAKI STEEL CO ,  BRIDGESTONE CORP

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

IPC: B01J13/00 ,  C01B31/00 ,  C10M125/02 ,  C10N20/00 ,  C10N20/06 ,  C10N30/02 ,  C10N40/14 ,  C10N50/00 ,  C10N70/00

Abstract: PURPOSE:To provide an electroviscous fluid which uses a powder carbonaceous capable of embodying excellent electroviscous characteristics and has viscosity under applied voltage much more stable than the conventinal ones and provide a method for producing a carbonaceous powder used for an electroviscous fluid. CONSTITUTION:A carbonaceous powder obtd. by thermally treating a tar pitch substantially free from pyridine-insols. and adjusting the particle size of the resultant product is used as fine dielectric particles.

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

公开(公告)号：JPH069206A

公开(公告)日：1994-01-18

申请号：JP32968992

申请日：1992-12-09

Applicant: KAWASAKI STEEL CO ,  BRIDGESTONE CORP

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

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

Abstract: PURPOSE:To produce excellent carbonaceous powder as dielectric particles of electroviscous fluid. CONSTITUTION:In production of dielectric powder for electroviscous fluid useful as dielectric particles of electroviscous fluid by dispersing dielectric particles to an oily medium having electrical insulating properties, an organic raw material selected from among the group consisting of coal, coal-based tar, coal-based pitch, liquefied substance of coal, cakes, petroleum, petroleum-based tar, petroleum-based pitch and resins is heat-treated at 300-800 deg.C to give carbonaceous particles. The prepared carbonaceous particles are adjusted to a proper particle size to give powder having