POWDER FOR ELECTROVISCOUS FLUID

Title:

POWDER FOR ELECTROVISCOUS FLUID

Document Type and Number:

Japanese Patent JPH1081889

Kind Code:

A

Abstract:

To provide a powder which is used for an electroviscous fluid, exhibits a high electroviscous effect over a wide temperature range with low power consumption, has high strength, and is hardly broken down when stressed and excellent in durability.

This powder comprises a carbonaceous material powder obtained by using a condensate of substantially an aromatic sulfonic acid or a salt thereof through a methylene linkage and a solvent as the raw material and has a truely spherical shape. Preferably, the spherical shape is such that the deviations of the maximum and minimum diameters of the powder from the mean diameter thereof are each within 30% of the mean diameter, and the powder has a crushing strength of at least 5kgf/2mm with a maximum displacement of at least 3%.

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Inventors:

ENDO SHIGEKI
SHII HAWARD
SAITO TASUKU
SAKATA KOJI
FUKUDA KENJI
HARA YOICHIRO
UMENO TATSUO

Application Number:

JP23680596A

Publication Date:

March 31, 1998

Filing Date:

September 06, 1996

Export Citation:

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Assignee:

BRIDGESTONE CORP
MITSUI MINING CO LTD

International Classes:

C01B31/02; C10M107/46; C10M171/00; C10N20/00; C10N20/06; C10N40/14; (IPC1-7): C10M107/46; C01B31/02

Attorney, Agent or Firm:

Atsushi Nakajima (4 people outside)

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