Optically anisotropic pitch for manufacturing high compressive s

Details Optically anisotropic pitch for manufacturing high compressive s Optically anisotropic pitch for manufacturing high compressive s

1994-09-15

1996-07-30

Lewis, Michael

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

208 22, C08L 9500

Patent

active

055409059

ABSTRACT:
An optically anisotropic pitch, which is suited for manufacturing particularly high compressive strength carbon fibers in a stable fashion, with satisfactory productivity and continuously, and also a method of manufacturing high compressive strength carbon fibers using the optically anisotropic pitch.
The optically anisotropic pitch for manufacturing high compressive strength carbon fibers is composed of a benzene soluble component (BS) and a benzene insoluble component (BI) and has a Q value (i.e., weight-average molecular weight divided by number-average molecular weight) of 1.6 or below, a number-average molecular weight ratio of the benzene soluble component to the benzene insoluble component of 2.5 or below, an aromatic carbon fraction factor (fa) of 0.8 or below, a C/H atomic ratio of 1.85 or below and an optically anisotropic phase of 90% or more.

REFERENCES:
patent: 4208267 (1980-06-01), Diefendorf et al.
patent: 4209500 (1980-06-01), Chwastiak
patent: 4601813 (1986-07-01), Izumi et al.
patent: 4655902 (1987-04-01), Izumi et al.

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