Process for preparing a tough, soluble, aromatic, thermoplastic

Details Process for preparing a tough, soluble, aromatic, thermoplastic Process for preparing a tough, soluble, aromatic, thermoplastic

1995-05-18

1997-06-17

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528172, 528173, 528176, 528185, 528188, 528220, 528229, 528350, C08G 7310, C08G 6926

Patent

active

056398506

ABSTRACT:
A process for preparing a tough, soluble, aromatic, thermoplastic copolyimide is provided. The process comprises the steps of (a) providing 4,4'-oxydiphthalic anhydride to 3,4,3',4'-biphenyltetracarboxylic dianhydride at a mole ratio ranging from about 25 mole percent to 75 mole percent to 75 mole percent to about 25 mole percent; (b) adding 3,4'-oxydianiline to form a mixture; c) adding a polar aprotic or polar protic solvent to the mixture to form a solution having a percentage of solids capable of maintaining polymer solubility; (d) stirring the solution to allow it to react; (e) adding an azeotropic solvent to the solution and heating to remove water; (f) cooling the solution of step (e) to room temperature and recovering the tough, soluble, aromatic, thermoplastic copolyimide.

REFERENCES:
patent: 4895972 (1990-01-01), Stoakley et al.
patent: 5218077 (1993-06-01), St. Clair et al.

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