Aminodicarboxylic acid intermediates for preparing polyimides

C - Chemistry – Metallurgy – 07 – C

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260/539.2, 260/5

C07C 229/66 (2006.01) C07C 237/30 (2006.01) C07D 307/89 (2006.01)

Patent

CA 1310651

ABSTRACT An aminocarboxylic acid of the formula Image in which R1 and R2 are halogen, nitro, aryl, aryloxy, alkyl or alkoxy, m is 0 or a number from 1 to 4, n is 0 or a number from 1 to 3 and p is 0, 1 or 2, the free carboxyl groups are bonded in the ortho-position relative to one another and R is a divalent aromatic radical which is substituted by at least one alkyl or aralkyl group, esters, amides, halides and anhydrides thereof are useful as intermediates in the production of polyimides useful for preparing protective films or photo- graphic relief images.

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