Process for producing mesophase pitch
Patent
·
OSTI ID:6322650
A substantially uniform mesophase pitch is prepared by treating a mesophase forming pitch material at elevated temperatures above about 380/sup 0/ C. to produce a mixture of mesophase and non-mesophase pitch containing about 20% to about 80% mesophase. The mixture is then maintained at a temperature below about 400/sup 0/ C. for a time sufficient to allow the mesophase to coalesce and settle as a lower separable layer. A mesophase pitch so produced may contain from 90 to 100% mesophase with a softening point of less than 320/sup 0/ C.
- Assignee:
- Toa Nenryo Kogyo Kabushiki Kaisha (Japan)
- Patent Number(s):
- US 4533461
- OSTI ID:
- 6322650
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
CARBON FIBERS
FIBERS
HEAT TREATMENTS
HIGH TEMPERATURE
MATERIALS
MELTING POINTS
MOLDING MATERIALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PITCHES
PRODUCTION
TAR
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
360601* -- Other Materials-- Preparation & Manufacture
CARBON FIBERS
FIBERS
HEAT TREATMENTS
HIGH TEMPERATURE
MATERIALS
MELTING POINTS
MOLDING MATERIALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PITCHES
PRODUCTION
TAR
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE