Mineral oils: processes and products – Asphalts – tars – pitches and resins; making – treating and...
Patent
1979-06-19
1981-01-06
O'Keefe, Veronica
Mineral oils: processes and products
Asphalts, tars, pitches and resins; making, treating and...
208 22, 4234471, C10C 100
Patent
active
042435129
ABSTRACT:
A process for preparing a pitch for carbon fiber by filtering a heavy pitch having a softening point of 150.degree.-200.degree. C. at a temperature of 250.degree.-300.degree. C. and further treating at the same temperature under reduced pressure.
REFERENCES:
patent: 3718493 (1973-02-01), Joo
patent: 3997654 (1976-12-01), Kolling et al.
patent: 4026788 (1977-05-01), McHenry
patent: 4032430 (1977-06-01), Lewis
Kureha Kagaku Kogyo Kabushiki Kaisha
O'Keefe Veronica
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