Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1989-07-25
1991-08-20
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528125, 528128, C08C 802, C08C 6926
Patent
active
050415280
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 reaction product of the dimethyl ester (or dianhydride) 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. When this dimer is reacted with 3,3', 4,4'-benzophenonetetracarboxylic acid dianhydride methylenedianiline amic acid mixture, the resulting polyimide prepolymer exhibits superior physical properties.
REFERENCES:
patent: 3708459 (1973-01-01), Lubowitz
Federal Register, vol. 54, No. 91, 20715-20744 (May 12, 1989) Occupational Exposure to 4,4'Methylenedianiline (MDA); Proposed Rule.
National Institute for Occupational Safety and Health, Current Intelligence Bulletin 47 (Jul. 25, 1986), Publication No. 86-115.
National Toxicology Program Technical Report No. 360, Toxicology & Carcinogenesis Studies of N,N-Dimethylaniline.
Chemical & Engineering News; "Advanced Polymer Composites Tailored for Aerospace Use"; pp. 37-52; Jul. 23, 1990.
35th International SAMPE Symposium, "A New Addition Polyimide Having Improved Toxicity, Outlife and Processing Properties"; R. B. Baggett et al.; Apr. 2-5, 1990.
Delaney Edward A.
Riel Frank J.
Vuong Tuyet
Foelak Morton
Hampton-Hightower P.
Rohr Industries, Inc.
Schlesinger Patrick J.
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