Low density, modified polyimide foams and methods of making same

Details Low density, modified polyimide foams and methods of making same Low density, modified polyimide foams and methods of making same

1984-03-07

1986-11-04

Anderson, Philip

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

1563315, 1563318, 264 464, 264 53, 264 54, 264DIG5, 4283171, 4284735, 521183, 521184, 521185, C08J 900, C08J 912, B32B 518, B32B 520

Patent

active

046210156

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: Re31756 (1984-12-01), Gagliani et al.
patent: 2915788 (1959-12-01), Engel
patent: 3089857 (1963-05-01), Pottenger
patent: 3192294 (1965-06-01), Streed et al.
patent: 3259677 (1966-07-01), Zwick
patent: 3301929 (1967-01-01), Bruun
patent: 3375209 (1968-03-01), Kemper
patent: 3455483 (1969-07-01), Enklaar
patent: 3581342 (1971-06-01), Dietzel et al.
patent: 3779858 (1973-12-01), Hiss et al.
patent: 3793281 (1974-02-01), Acle, Jr.
patent: 3843757 (1974-10-01), Ehrenfreund et al.
patent: 3899626 (1975-08-01), Steffen
patent: 3917761 (1975-11-01), Scheuerlein et al.
patent: 3930097 (1975-12-01), Alberino et al.
patent: 4061812 (1977-12-01), Gilwee, Jr. et al.
patent: 4070312 (1978-01-01), Gagliani et al.
patent: 4100140 (1978-07-01), Zahir et al.
patent: 4161477 (1979-07-01), Long et al.
patent: 4183838 (1980-01-01), Gagliani
patent: 4183839 (1980-01-01), Gagliani
patent: 4233258 (1980-11-01), St. Clair
patent: 4238538 (1980-12-01), Manwiller
patent: 4266919 (1981-05-01), Dunnington et al.
patent: 4299946 (1981-11-01), Balme et al.
patent: 4302413 (1981-11-01), Howe et al.
patent: 4303779 (1981-12-01), Stenzenberger
patent: 4305796 (1981-12-01), Gagliani et al.
patent: 4361453 (1982-11-01), Gagliani et al.
patent: 4369261 (1983-01-01), Gagliani et al.
patent: 4394464 (1983-07-01), Gagliani et al.
patent: 4407980 (1983-10-01), Gagliani et al.
patent: 4425441 (1984-01-01), Gagliani et al.
patent: 4426463 (1984-01-01), Gagliani et al.
patent: 4444823 (1984-04-01), Gagliani et al.
patent: 4468431 (1984-08-01), Okey
patent: 4476254 (1984-10-01), Long et al.
patent: 4518717 (1985-05-01), Long et al.
patent: 4546115 (1985-10-01), Gagliani et al.
McKelvey, James M., Polymer Processing, New York, John Wiley and Sons, c1962, pp. 1-4.

Affiliated with

Also associated with

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

Comments { 0 }

Profile ID: LFUS-PAI-O-696754