Dimer for synthesis of high performance polymer matrix composite

Details Dimer for synthesis of high performance polymer matrix composite Dimer for synthesis of high performance polymer matrix composite

1988-05-16

1991-08-20

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, C08G 802, C08G 6926

Patent

active

050415271

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'-methylenedianiline. This dimer is then reacted with the dimethyl ester of 3,3',4,4'-benzophenonetetracarboxylic acid and 4,4'-methylenedianiline. The resulting polyimide prepolymer exhibits superior physical properties and is substantially free of the undesired trimer of 5-norbornene-2,3-dicarboxylic acid, or acid ester or anhydride and 4,4'-methylenedianiline.

REFERENCES:
patent: 3697345 (1972-10-01), Vaughan et al.
patent: 3708459 (1973-01-01), Lubowitz
Chemical & Engineering News; "Advanced Polymer Composites Tailered for Aerospace Use", pp. 37-57 ; Jul. 23, 1990.
35th International SAMPE Symposium, "A New PMR Addition Polyimide Having Improved Toxicity, Outlife and Processing Properties"; R. B. Baggett et al.; Apr. 2-5, 1990.
Paul H. Lindenmeyer et al., "Characterization of PMR Polyimide Resin and Prepreg", NASA Contractor Report, NASA CR-168217.
Raymond D. Vannucci, "PMR Polyimide Compositions for Improved Performance at 371.degree. C.", published in SAMPE Quarterly, vol. 19, pp. 31 to 36 (1987).
Philip R. Young et al., "Characterization of Aging Effects of LARC-160", reprinted from Resins for Aerospace, American Chemical Society Symposium Series No. 132, pp. 479-490, (1980).

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