Photochemical Behavior of Nifedipine Derivatives and Application to Photosensitive Polyimides

Photochemical conversion of 4-(2'-nitrophenyl)-1,4-dihydropyridine derivatives was found to act as a chromophore tor photosensitive polyimide precursors giving a dual imaging-mode characteristics. The sensitivities and contrasts for the negative and positive-working poly(amic-acid)'s were evaluated. The photochemical behaviors such as the quantum yields of the photoemission and the conversion, the reaction products and the transient species were studied. The mechanism of photosensitizing poly(amic-acid) was proposed.