Mesophase pitch for use in the making of carbon materials and pr

Details Mesophase pitch for use in the making of carbon materials and pr Mesophase pitch for use in the making of carbon materials and pr

1988-11-22

1990-01-02

Myers, Helane

Mineral oils: processes and products

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

208 22, 208 44, 585 11, 585422, 585426, 4234474, 25229962, 528247, C10C 120

Patent

active

048911267

ABSTRACT:
Pitch that is obtained from a condensed polycyclic aromatic hydrocarbon and the content of an optically anisotropic phase in which is substantially 100% is disclosed. This mesophase pitch has a H/C atomic ratio of 0.5-1.0, contains naphthenic carbon in an amount of at least 7% of the total carbon, and has a softening point of 180.degree.-400.degree. C. Fibers melt-spun from this mesophase pitch can be converted to carbon or graphite fibers having high strength and modulus of elasticity by a heat treatment which consists of heating to a temperature of 250.degree.-300.degree. C. in an air atmosphere, then heating to 1,000.degree. C. or higher in an inert gas atmosphere. Such mesophase pitch is produced by polymerizing a condensed polycyclic aromatic hydrocarbon for 5-300 minutes at a temperature of 180.degree.-400.degree. C. and at a pressure of 5-100 atmospheres in the presence of 0.1-20 moles of HF and 0.05-1 mole of BF.sub.3 per mole of the condensed polycyclic aromatic hydrocarbon.

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