Claims
- 1. A fiber-reinforced composition comprising from about 5 to about 80 wt % of a reinforcing fiber and a polyamide-imide matrix resin derived from at least one trimellitic acid compound selected from the group consisting of trimellitic acid anhydride and 4-trimellitoyl anhydride chloride, 3,3'4,4'-biphenyl tetracarboxylic acid dianhydride and at least one aromatic diamine selected from the group consisting of oxy-bisaniline and m-phenylene diamine, said trimellitic acid compound and said biphenyl tetracarboxylic acid anhydride being present in a mole ratio of from about 3:7 to about 9:1.
- 2. The fiber-reinforced composition of claim 1 wherein said reinforcing fiber is carbon fiber.
- 3. In a composite composition comprising reinforcing fibers, a polyamide-imide matrix resin derived from trimellitic acid compounds and at least one aromatic diamine; and, optionally, fillers, flow improvers and thermoplastic resins, the improvement wherein said matrix resin comprises trimellitic acid compounds and biphenyl tetracarboxylic acid anhydride in a mole ratio of from about 3:7 to about 9:1.
- 4. The composite composition of claim 3 wherein said biphenyl tetracarboxylic acid anhydride are 3,3'4,4'-biphenyl tetracarboxylic acid anhydride.
- 5. The improved composition of claim 3, wherein the said aromatic diamine is selected from the group consisting of oxybisaniline and m-phenylene diamine.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. application Ser. No. 393,389, filed Aug. 14, 1989, now U.S. Pat. No. 4,970,292.
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4448957 |
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4861855 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
393389 |
Aug 1989 |
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