Method of producing new flame-retardant thermostable homopolyimi

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

1990-01-31

1992-06-09

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 51, 528 52, 528 73, 528223, 528224, 528229, 528350, 528351, 528353, 26433116, C08G 1822

Patent

active

051208148

ABSTRACT:
To produce flame-retardant thermostable new homopolyimides having structural units of the general formula ##STR1## by reacting 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride with an overall equimolar amount of 2,4- and/or 2,6-toluene 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.degree. 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.

REFERENCES:
patent: Re31805 (1985-01-01), Takekoshi
patent: 4001186 (1977-01-01), Onder
patent: 4021412 (1977-05-01), Onder
patent: 4156065 (1979-05-01), Onder

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