Crystalline polyetherimides and polyamic acid precursors...

Details Crystalline polyetherimides and polyamic acid precursors... Crystalline polyetherimides and polyamic acid precursors...

C - Chemistry, Metallurgy

08

G

402/221

C08G 73/10 (2006.01)

Patent

CA 1241793

CRYSTALLINE POLYETHERIMIDES AND POLYAMIC ACID PRECURSORS THEREFOR ABSTRACT OF THE DISCLOSURE Crystalline polyetherimides having equilibrium melting points below 400°C are obtained by the reaction of various p-linked polycyclic tetracarboxylic acids or their functional derivatives with p-linked polycyclic diamines. The structural units in said crystalline polyetherimides contain at least 7 aromatic rings.

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