Process for the preparation of polyetherimides

Details Process for the preparation of polyetherimides Process for the preparation of polyetherimides

1989-02-07

1990-03-20

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528172, 528185, C08G 6926

Patent

active

049102885

ABSTRACT:
An improved solution polymerization process for the preparation of polyetherimides comprises prereacting an aromatic bis(ether anhydride) with an aromatic diamine, followed by the addition of phthalic anhydride end capping agent and further reaction to form an end capped prepolymer. The prepolymer is converted to polyetherimide. The improved process advantageously greatly reduces the formation of PAMI, an undesired byproduct.

REFERENCES:
patent: 3234181 (1966-02-01), Olivier

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