Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1993-03-03
1994-03-29
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521155, 521185, 521189, 528347, 528348, C08J 902
Patent
active
052985318
ABSTRACT:
A polyimide foam is prepared by heating a mixture comprising an alkyl ester of 4,4'-oxydiphthalic acid and a diamine at a temperature of 60.degree. to 350.degree. C. This foam is elastic and flame-retardant and has an excellent resistance to acid and alkali.
REFERENCES:
patent: 4980389 (1990-12-01), Hill et al.
Ishikura Motoshi
Watanabe Nobuyuki
Daicel Chemical Industries Ltd.
Foelak Morton
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