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公开(公告)号：US4208267A
公开(公告)日：1980-06-17
申请号：US903172
申请日：1978-05-05
摘要： An improved process for preparing liquid-crystal containing pitches comprises extracting carbonaceous isotropic pitches with an organic solvent system to provide a solvent insoluble fraction which when heated for 10 minutes or less and to temperatures in the range of about 230.degree. C. to 400.degree. C. will upon polarized light microscopy examination of cooled samples display greater than 75% of an optically anisotropic phase.
摘要翻译： 用于制备含液晶的间距的改进方法包括用有机溶剂系统萃取碳质各向同性沥青，以提供溶剂不溶性级分，当加热10分钟或更低时，温度在约230℃至400℃ 将在偏光显微镜下检查冷却样品显示大于75％的光学各向异性相。
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公开(公告)号：US4331620A
公开(公告)日：1982-05-25
申请号：US123933
申请日：1980-02-25
摘要： Heat treated pitches, especially pitches containing either isotropic or anisotropic phases as well as mixtures thereof, are spun by subjecting the pitch at spinning temperatures to shearing forces while simultaneously spinning the pitch.
摘要翻译： 经热处理的间距，特别是包含各向同性或各向异性相的间距及其混合物，通过在旋转温度下对沥青进行剪切力同时旋转沥青而进行纺丝。
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公开(公告)号：US4465586A
公开(公告)日：1984-08-14
申请号：US388017
申请日：1982-06-14
摘要： An improved process for preparing liquid crystal containing pitches includes extracting carbonaceous isotropic pitches with an organic solvent system which comprises at least one member of the group consisting of dioxane, dimethylacetamide, and tetramethylurea.
摘要翻译： 用于制备含有液晶的间距的改进方法包括用有机溶剂系统萃取含碳各向同性沥青，该有机溶剂体系包含二恶烷，二甲基乙酰胺和四甲基脲中的至少一种成员。
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公开(公告)号：US4443324A
公开(公告)日：1984-04-17
申请号：US388479
申请日：1982-06-14
摘要： A low melting point, low molecular weight, heptane insoluble, 1,2,4-trichlorobenzene soluble mesophase pitch useful in carbon fiber spinning as such or as a plasticizer in a carbon fiber spinning composition is obtained by heating chrysene, triphenylene or paraterphenyl as well as mixtures thereof and hydrocarbon fractions containing the same, dissolving the resulting heat treated material with 1,2,4-trichlorobenzene, and separating the insolubles, and then contacting the 1,2,4-trichlorobenzene soluble fraction with a sufficient amount of heptane to precipitate the low melting point, low molecular weight mesophase pitch.
摘要翻译： 通过对碳纤维纺丝组合物中的碳纤维纺丝或增塑剂可用的低熔点，低分子量，庚烷不溶性，1,2,4-三氯苯可溶中间相沥青也可通过加热三苯乙烯或对甲苯基苯 作为其混合物和含有它们的烃馏分，将所得热处理材料与1,2,4-三氯苯溶解，分离不溶物，然后使1,2,4-三氯苯可溶部分与足量的庚烷接触 沉淀低熔点，低分子量中间相沥青。
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