Method of producing new flame-retardant thermostable...

Details Method of producing new flame-retardant thermostable... Method of producing new flame-retardant thermostable...

C - Chemistry, Metallurgy

08

G

402/33

C08G 16/00 (2006.01) C08G 73/10 (2006.01)

Patent

CA 2009383

ABSTRACT OF THE DISCLOSURE To produce flame-retardant thermostable new homopolyimides having structural units of the general formula Image by reacting 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride with an overall equimolar amount of 2,4- and/or 2,6-toluylene diisocyanate, the reaction is carried out in the presence of a polymerization accelerator. The new homopolyimides have a glass transition point of at least 320°C and are processible to moulded articles exhibiting a similarly good structural strength as could hitherto be observed in mixed polyimides only. Furthermore, the new homopolyimides can be spun to fibres.

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