Dimer for synthesis of high performance polymer matrix composites
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United States of America Patent
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Aug 20, 1991
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app pub date -
Apr 26, 1990
filing date -
May 16, 1988
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Abstract
An improved synthesis for PMR-type polyimides, including first preparing a dimer of 5-norbornene-2,3-dicarboxylic acid, or acid ester or anhydride and 4,4'methylene dianiline. This dimer is then reacted with one of the following: 1. the reaction product of a primary aromatic diamine and an aromatic dianhydride. 2. an aromatic dianhydride. 3. a mixture of a primary aromatic diamine and an aromatic dianhydride, or an ester of an aromatic tetraacid or an aromatic tetraacid. The resulting polyimide prepolymer exhibits superior physical properties and is substantially free of undesired impurities and unreacted 4,4'-methylene dianiline.
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