Method for depolymerizing polyimides and recovering reagents the

Details Method for depolymerizing polyimides and recovering reagents the Method for depolymerizing polyimides and recovering reagents the

1996-10-07

1998-02-24

Jagannathan, Vasu

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

Synthetic resins

Process of treating scrap or waste product containing solid...

521 495, 526262, 528488, 528492, 528503, C08J 1108

Patent

active

057212805

ABSTRACT:
Polyimides, especially thermoset polyimides such as those prepared by the reaction of p-phenylenediamine with 4,4'-hexafluoroisopropylidenebis(phthalic anhydride) and nadic ester, are converted to monomers which may be recycled for polyimide synthesis by heating with a solution of an alkali metal hydroxide, such as lithium hydroxide or sodium hydroxide, in a dipolar aprotic solvent such as N-methylpyrrolidone. The products are the diamine and the tetracarboxylic acid alkali metal salt corresponding to the dianhydride.

REFERENCES:
patent: 3529017 (1970-09-01), Izard et al.
patent: 4349479 (1982-09-01), Takekoshi et al.
patent: 4451643 (1984-05-01), Edmonds, Jr. et al.

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