Optically anisotropic pitch
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United States of America Patent
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Jan 31, 1989
Grant Date -
N/A
app pub date -
Oct 2, 1986
filing date -
Oct 2, 1985
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Expired
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Abstract
A novel optically anisotropic pitch is provided which is produced by thermal modification of a polymer having a structure of an alkylbenzene and a condensed aromatic compound with two to four fused rings bonded to each other via a methylene group. In preferred embodiments, the optical anisotropy is 80% or more. As the alkylbenzene there may be used xylene, trimethylbenzene or tetramethylbenzene. As the condensed aromatic compound with two to four fused rings, there may be used naphthalene, anthracene, phenanthrene, or naphthacene. The polymer starting material may be obtained by the reaction of a xylene formalin resin, mesitylene formalin resin or alkylbenzene and a condensed aromatic compound with two to four fused rings in the presence of a protonic acid as a catalyst.
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