Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1999-05-21
2000-10-17
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521183, 521185, 521189, 523219, C08J 900, C08J 930
Patent
active
061333301
ABSTRACT:
A mechanically undensified aromatic polyimide foam is made from an aromatic polyimide precursor solid residuum and has the following combination of properties: a density according to ASTM D-3574A of about 0.5 pounds/ft.sup.3 to about 20 pounds/ft.sup.3 ; a compression strength according to ASTM D-3574C of about 1.5 psi to about 1500 psi; and a limiting oxygen index according to ASTM D-2863 of about 35% oxygen to about 75% oxygen at atmospheric pressure. The aromatic polyimide foam has no appreciable solid inorganic contaminants which are residues of inorganic blowing agents. The aromatic polyimide which constitutes the aromatic polyimide foam has a glass transition temperature (Tg) by differential scanning calorimetry of about 235.degree. C. to about 400.degree. C.; and a thermal stability of 0 to about 1% weight loss at 204.degree. C. as determined by thermogravimetric analysis (TGA).
The aromatic polyimide foam has utility as foam insulation and as structural foam, for example, for aeronautical, aerospace and maritime applications.
REFERENCES:
patent: 3441532 (1969-04-01), Victorious
patent: 4535115 (1985-08-01), Bakshie al.
patent: 4670478 (1987-06-01), Shulman et al.
patent: 4900261 (1990-02-01), Lee
patent: 5077318 (1991-12-01), Barringer et al.
patent: 5122546 (1992-06-01), Lee
patent: 5298531 (1994-03-01), Ishikura et al.
WPI/Derwent 1977-243843 Abstract.
Echigo Yoshiaki
Kaneshiro Hisayasu
St. Clair Terry L.
Weiser Erik S.
Foelak Morton
The United States of America as represented by the Administrator
LandOfFree
Aromatic polyimide foam does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aromatic polyimide foam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aromatic polyimide foam will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-469708