Method of making thermotropic liquid crystalline polymers containing hydroquinone
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United States of America Patent
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Aug 25, 1998
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app pub date -
Mar 22, 1996
filing date -
Mar 22, 1996
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Abstract
Liquid crystalline polymers that are made from 4-hydroxybenzoic acid, 2,6-naphthalenedicarboxylic acid, terephthalic acid, hydroquinone, and N-acetyl-4-aminophenol by heating the monomers in the presence of acetic anhydride are more easily synthesized in high molecular weight if isophthalic acid is also included as a monomer at a level of about 0.5 mole % to about 10 mole %.
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