| 摘要 |
<p>LOW MOLECULAR WEIGHT MESOPHASE PITCH A low molecular weight, anisotropic pitch consisting of essentially 100 percent mesophase and suitable for spinning into continuous filaments can be prepared by passing an inert gas through an isotropic carbonaceous pitch at a rate of at least 4.0 scfh. per pound of pitch while heating the pitch at a temperature of from about 380.degree.C. to about 430.degree.C. to produce mesophase and simultaneously agitating the pitch so as to produce a homogeneous emulsion of the mesophase produced and the remaining non-mesophase portion of the pitch, said heating and agitation being continued until the pitch has been essentially completely converted to mesophase and the emulsion has been transformed into an essentially single phase system. When examined under polarized light, the pitches of the present invention are seen to consist of a single phase which is essentially completely anisotropic. The fibers spun from such pitch are also essentially completely anisotropic and can be further processed to produce carbon and graphite fibers having a high Young's modulus of elasticity and high tensile strength.</p> |
