Process for the preparation of mesophase pitches

Details Process for the preparation of mesophase pitches Process for the preparation of mesophase pitches

1987-05-11

1989-04-11

Pal, Asok

Mineral oils: processes and products

Asphalts, tars, pitches and resins; making, treating and...

By chemical conversion of oil

208 22, 208 39, 208 44, 4234471, 4234472, 4234474, C10C 300

Patent

active

048204013

ABSTRACT:
A process for the preparation of an excellent mesophase pitch suitable for use as a spinning pitch for the production of high performance carbon fibers is disclosed. The mesophase pitch can satisfy the four remarkable characteristics at the same time, i.e., a softening point of below 320.degree. C. as determined by Mettler method, a mesophase content of above 90% as examined on a polarized microscope, a quinoline insoluble content of less than 20%, and a xylene soluble content of less than 20%. The mesophase pitch is particularly homogeneous and is easily spinnable. The process can be characterized by a preliminary extraction step, a continuous heat treatment step, and an extraction step. In some cases, the preliminary extraction step can be omitted. Graphite fibers having a tensile strength of about 400 Kg/mm.sup.2 and a modulus of elasticity of above 60 ton/mm.sup.2 can be obtained from the mesophase pitch. Further, even carbon fibers prepared at a carbonization temperature of 1000.degree. C. have a tensile strength of about 300 Kg/mm.sup.2.

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