Mineral oils: processes and products – Products and compositions – Asphalts – tars – pitches and resins
Patent
1985-03-11
1986-08-26
Metz, Andrew H.
Mineral oils: processes and products
Products and compositions
Asphalts, tars, pitches and resins
208 39, 208 41, 208 44, C10C 100, C10C 300
Patent
active
046081500
ABSTRACT:
The invention provides a novel pitch material useful as a base material of carbon fibers having excellent mechanical properties and characterized by a unique combination of several property parameters including the content of the optically anisotropic phase of at least 80%, a content of the pyridine-insoluble matter in the range from 30 to 70% by weight, a number average molecular weight in the range from 1000 to 1400 and a softening point in the range from 330.degree. to 380.degree. C. Such a pitch material is obtained from a starting pitch of a petroleum-based residual oil freed from light oily matter through a two-step heat treatment, of which the first step is performed at 400.degree. to 460.degree. C. under a pressure of 5 to 50 mmHg and the second step is performed at 450.degree. to 550.degree. C. for 0.2 to 30 minutes under a pressure of 0.1 to 5 mmHg. The advantages obtained by use of a film evaporator in the above mentioned heat treatment are described. The time taken for the infusibilization treatment of the pitch filaments is greatly decreased when the filaments were prepared from the inventive pitch material by spinning in comparison with conventional pitches and the spinning temperature can also be relatively low.
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Itoi Masaaki
Nishitani Hiroshi
Ohta Masakatsu
Sugioka Taizo
Yoshihara Kunio
Idemitsu Kosan Company Limited
Metz Andrew H.
Myers Helane
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