Process for producing a homogeneous low softening point, optical

Details Process for producing a homogeneous low softening point, optical Process for producing a homogeneous low softening point, optical

1983-02-17

1984-06-12

Gantz, Delbert E.

Mineral oils: processes and products

Products and compositions

Asphalts, tars, pitches and resins

208 39, 208 44, 4234472, C01C 300, D01F 912, D01F 920

Patent

active

044540205

ABSTRACT:
A process for producing optically anisotropic pitch containing 80% or more of an anisotropic phase. A starting material is pyrolytically polycondensed. Afterward, the material is maintained at a temperature of between 350.degree. and 400.degree. C. to precipitate a portion of the material rich in the anisotropic phase having a high specific gravity. This portion is separated and further heat treated.

REFERENCES:
patent: 2992181 (1961-07-01), Renner
patent: 3976729 (1976-08-01), Lewis et al.
patent: 4026788 (1977-06-01), McHenry
patent: 4032430 (1977-06-01), Lewis
patent: 4303631 (1981-12-01), Lewis et al.

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