A new amine photo-generator{[(4,5-dimethoxy-2-nitrobenzyl)oxyl carbonyl}-2,6-dimethyl piperidine (1) was prepared. Compound 1 was found to be effective for isomerization of polyisoimide (PII) to the corresponding polyimide (PI). The PII was prepared by the ring-opening polyaddition of oxydiphthalic anhydride (ODPA) and 3,3'-diaminodiphenylsulfone (3,3'-DDS), followed by treatment with trifluoroacetic anhy-dride-triethylamine (TEA) in N-methyl-2-pyrrolidone (NMP). The PH containing 10 wt% of 1 functioned as photosensitive resist, when it was postbaked at 150 °C for 5 min followed by development with cyclohexanone at 45 °C.
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