Low density, modified polyimide foams and methods of making same

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

521183, 521184, 521185, 521189, 528184, 528322, 528323, 528328, C08J 932

Patent

active

044762542

ABSTRACT:
Methods of making low density modified polyimide/polyimide-amide foams and the resulting compositions. An N-substituted aliphatic imide is prepared by reacting a suitable aromatic dianhydride with a suitable oxime. A polyimide forming material is prepared by dissolving the N-substituted aliphatic imide in an esterifying solvent, then adding a suitable aromatic diamine. This material is dried to a powder. A suitable hydrated compound which is stable up to at least about 100.degree. C. is mixed with the powder. A foam is then produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient flexible foam. The addition of the hydrated compound is found to result in an exceptionally low density foam. Depending upon heating conditions, a polyimide, polyimide-amide or mixture thereof may be produced, resulting in foams having selectively variable physical properties.

REFERENCES:
patent: 4425441 (1984-01-01), Gagliani et al.
patent: 4426463 (1984-01-01), Gagliani et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Low density, modified polyimide foams and methods of making same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low density, modified polyimide foams and methods of making same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low density, modified polyimide foams and methods of making same will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1601343

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.