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Thermosetting solution composition and prepreg

  • US 7,807,014 B2
  • Filed: 07/24/2008
  • Issued: 10/05/2010
  • Est. Priority Date: 05/31/2005
  • Status: Active Grant
First Claim
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1. A process for preparing a thermosetting solution composition comprising a biphenyltetracarboxylic acid compound containing at least 15 mol % of a partial lower aliphatic alkyl ester of 2,3,3′

  • ,4′

    -biphenyltetracarboxylic acid and/or a partial lower aliphatic alkyl ester of 2,2′

    ,3,3′

    -biphenyltetracarboxylic acid, an aromatic diamine compound in a molar amount larger than a molar amount of the biphenyltetracarboxylic acid compound, said aromatic diamine compound being selected from the group consisting of p-phenylenediamine, m-phenylenediamine, 1,3-bis(4-aminophenoxy)benzene and a mixture thereof, and a partial lower aliphatic alkyl ester of 4-(2-phenylethynyl)phthalic acid compound in a molar amount as much as 1.8-2.2 times a molar amount corresponding to a difference between the molar amount of the aromatic diamine compound and the molar amount of the biphenyltetracarboxylic acid compound dissolved in an organic solvent comprising a lower aliphatic alcohol, in which a total amount of the biphenyltetracarboxylic acid compound, 4-(2-phenylethynyl)phthalic acid compound and aromatic diamine compound is in the range of 30 to 80 wt. % based on an amount of the thermosetting solution composition, which comprises the steps of;

    placing a biphenyltetracarboxylic acid compound containing at least 15 molar % of 2,3,3′

    ,4′

    -biphenyltetracarboxylic dianhydride and/or 2,2′

    ,3,3′

    -biphenyltetracarboxylic dianhydride, and 4-(2-phenylethynyl)phthalic anhydride in the organic solvent, to give a suspension;

    heating the suspension to give a solution in which the partial lower aliphatic alkyl ester of the biphenyltetracarboxylic acid compound and the partial lower aliphatic alkyl ester of 4-(2-phenylethynyl)phthalic acid are dissolved; and

    mixing the aromatic diamine compound with the solution obtained above.

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