Treatment of pitches in carbon artifact manufacture
Post-treatment of spinnable precursors from petroleum pitch
Pitch for direct spinning into carbon fibers derived from a coal distillate feedstock
Pitch for direct spinning into carbon fibers derived from a steam cracker tar feedstock
Pitch for the production of carbon fibers Patent #: 4620919
ApplicationNo. 780344 filed on 10/22/1991
US Classes:208/39, ASPHALTS, TARS, PITCHES AND RESINS; MAKING, TREATING AND RECOVERY208/22, Asphalts, tars, pitches and resins208/44, Chemical modification of asphalt, tar, pitch or resin208/45, Solvent extraction423/447.4Prior treatment before carbonization (except with gaseous oxygen)
ExaminersPrimary: Morris, Theodore
Assistant: Hailey, P. L.
Attorney, Agent or Firm
International ClassesC10C 003/00
Foreign Application Priority Data1990-10-22 JP
AbstractSpinning pitch for carbon fibers, which (1) has a glass transition temperature width of at most 60° C. as measured by a differential scanning calorimeter, (2) contains at least 80% by volume an optically anisotropic phase, and (3) shows a shear viscosity of 200 poise at a temperature of from 270° to 370° C.