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
1999-11-30
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264123, 264DIG6, 264 465, 521134, 521180, 521183, 521184, 521185, 521189, 521 54, C08J 932, B01J 1302
Patent
active
059944188
ABSTRACT:
A shaped article composed of an aromatic polyimide has a hollow, essentially spherical structure and a particle size of about 100 to about 1500 .mu.m, a density of about 1 to about 6 pounds/ft.sup.3 and a volume change of 1 to about 20% by a pressure treatment of 30 psi for 10 minutes at room temperature. A syntactic foam, made of a multiplicity of the shaped articles which are bounded together by a matrix resin to form an integral composite structure, has a density of about 3 to about 30 pounds/ft.sup.3 and a compression strength of about 100 to about 1400 pounds/in.sup.2.
REFERENCES:
patent: 4407980 (1983-10-01), Gagliani et al.
patent: 4425441 (1984-01-01), Gagliani et al.
patent: 4433068 (1984-02-01), Gagliani et al.
Echigo Yoshiaki
Kaneshiro Hisayasu
St. Clair Terry L.
Weiser Erik S.
Foelak Morton
Hawkins Hillary W
The United States of America as represented by the Administrator
Unitika Ltd.
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