Pitch with reduced tendency to smoke during spinning and a proce

Details Pitch with reduced tendency to smoke during spinning and a proce Pitch with reduced tendency to smoke during spinning and a proce

1995-06-30

1997-07-01

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

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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