Pitch with reduced tendency to smoke during spinning and a proce

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From aldehyde or derivative thereof as reactant

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208 22, 208 39, 208 44, 585 11, 585422, 585426, C10C 302

Patent

active

056440189

ABSTRACT:
Mesophase pitch that has a softening point of no more than 250.degree. C., a pyridine-insolubles content of no more than 50% and a n-heptane solubles content of 3-10%, with the n-heptane solubles experiencing a weight loss of no more than 15% at 450.degree. C. as measured by thermogravimetry is produced by polymerizing a condensed polycyclic aromatic hydrocarbon or a substance containing it in the presence of HF and BF.sub.3. This mesophase pitch is suppressed satisfactorily in its tendency to smoke during spinning and, additionally, it has a low enough softening point to exhibit outstanding spinnability. Hence, the pitch allows for high-volume spinning to be performed continuously for a prolonged time without causing extensive fouling of the surface of spinning nozzles.

REFERENCES:
patent: 4789455 (1988-12-01), Mochida et al.
patent: 4891126 (1990-01-01), Mochida et al.
patent: 5091072 (1992-02-01), Tsuchitani et al.
patent: 5182010 (1993-01-01), Mochida et al.

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