Self-adhesive carbonaceous grains and process for producing high

Details Self-adhesive carbonaceous grains and process for producing high Self-adhesive carbonaceous grains and process for producing high

1994-12-07

1996-01-16

Straub, Gary P.

Mineral oils: processes and products

Products and compositions

Asphalts, tars, pitches and resins

423445R, C10G 7336

Patent

active

054845203

ABSTRACT:
Self-adhesive carbonaceous grains for use in the manufacture of high-density and high-strength carbon artifacts containing 0.5-1.5 wt % of a quinoline-soluble but pyridine-insoluble component and at least 97 wt % of a quinoline-insoluble component and which are prepared by heat-treating in a nonoxidizing atmosphere a mesophase pitch that is obtained by polymerizing condensed polycyclic hydrocarbons or substances containing them in the presence of a superacid consisting of hydrogen fluoride and boron trifluoride. The carbonaceous grains are molded and the mold is baked at a sufficient temperature to achieve its carbonization, with the heating rate being not more than 20.degree. C./h in the temperature range from 400.degree. to 600.degree. C. In this way, high-density and high-strength carbon artifacts showing a homogeneous fine mosaic texture of optical anisotropy can be efficiently manufactured in high carbon yield.

REFERENCES:
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patent: 4293533 (1981-10-01), Asano et al.
patent: 4637906 (1987-01-01), Fukuda et al.
patent: 4789455 (1988-12-01), Mochida et al.
patent: 4891126 (1990-01-01), Mochida et al.
International Symposium on Carbon, Toyohashi, Extended Abstract, pp. 196-199 1982 (no month).
Carbon, vol. 28, 1990, p. 559 and p. 143 (no month) "Viscous Flow of Black Carbon . . .".
Tanso, No. 155, p. 370, 1992 "Preparation, Structure and Application of Mesophase Patches . . . " (no month).

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