| 摘要 |
PURPOSE:To obtain a homogeneous mesophase pitch having low softening point and suitable for the production of carbon fiber and molded carbon material having high strength and elastic modulus, by removing solid particles from a mesophase pitch production raw material, and carrying out the thermal decomposition polycondensation of the material. CONSTITUTION:After removing the solid particles from a mesophase pitch production raw material, the material is heated (preferably at about 410-440 deg.C) to effect the thermal decomposition polycondensation until the mesophase pitch fraction in the polycondensate reaches about 20-80vol%. The polycondensation product is left at rest at about <=400 deg.C (preferably about 360-390 deg.C) to effect the separation of the material into the lower layer consisting of mesophase pitch having high density and the upper layer containing the non-mesophase having lower density as the major part and the upper layer is separated as the objective pitch. |
