Mineral oils: processes and products – Asphalts – tars – pitches and resins; making – treating and... – Chemical modification of asphalt – tar – pitch or resin
Patent
1996-06-24
1998-07-14
Myers, Helane
Mineral oils: processes and products
Asphalts, tars, pitches and resins; making, treating and...
Chemical modification of asphalt, tar, pitch or resin
208 39, C10C 120
Patent
active
057798800
ABSTRACT:
An electrorheological fluid is constituted by using a dispersed phase of a carbonaceous powder having an oxygen content above 10% by weight but not more than 20% by weight and having an average particle diameter of 0.01-100 .mu.m, obtained by:
heat-polymerizing a condensed polycyclic aromatic compound containing a main component of naphthalene by using HF/BF.sub.3 as a catalyst to obtain a 100% meso-phase pitch having a softening point within a range of 150.degree.-400.degree. C.;
heat-treating and making the pitch infusible in an oxidizing atmosphere at a temperature not more than a fusing temperature of the pitch and not less than 50.degree. C. but not more than 400.degree. C. to allow the pitch to have an oxygen content of 12-25% by weight; and then
heat-treating and carbonizing the pitch in an inert gas atmosphere at a temperature not less than 300.degree. C. but not more than 700.degree. C.
It is thus possible to obtain an electrorheological fluid having low current consumption, a high electrorheological effect and excellent long-term durability, even when the carbonaceous powder having high oxidation resistance and a high oxygen content is used.
REFERENCES:
patent: 4789455 (1988-12-01), McChida et al.
patent: 5087382 (1992-02-01), Ishino et al.
patent: 5106521 (1992-04-01), Kurachi et al.
patent: 5182010 (1993-01-01), Mochida et al.
patent: 5332517 (1994-07-01), Torii et al.
patent: 5352718 (1994-10-01), Ishino et al.
Haraoka Takashi
Hatano Hitomi
Ishino Yuichi
Maruyama Takayuki
Ogino Takao
Bridgestone Corporation
Kawasaki Steel Corporation
Myers Helane
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