Polyimide resins prepared by addition reactions

Details Polyimide resins prepared by addition reactions Polyimide resins prepared by addition reactions

C - Chemistry, Metallurgy

08

G

402/221, 260/306

C08G 73/10 (2006.01) C07D 209/48 (2006.01) C07D 405/14 (2006.01) C07D 487/04 (2006.01) C08G 73/12 (2006.01)

Patent

CA 2033317

Polyimides having a high thermal and oxidative stability are prepared by reacting a mixture of monomers comprising (a) a dialkyl, trialkyl, or tetraalkylester of an aromatic tetracarboxylic acid, (b) an aromatic diamine, and (c) an end cap compound. The ratio of (a), (b), and (c) is chosen so that upon heating the mixtures, low molecular weight prepolymers are formed, the prepolymers having only one end cap radical and being suitable for chain extension and crosslinking to form high molecular weight, thermally stable polyimides. Upon heating, the prepolymers form polyimide resins, which can have Tg in excess of 600°F and superior physical properties.

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