Preparation of high sensitivity resin composition of poplars (positive imag)

摘要

A photosensitive resin compsn. is prepd. by mixing a naphthoquinone diazide cpd. and a novolac resin with 0.3-5 wt.% cpd. of formula (I) and 0.3-10 wt.% cpd. of formula (II) as an additive for improving a photosensitivity. In the formulas, R1, R2, R3 and R4 each H or halogen; R5 is H or methyl; R6 is H or CH; R7, R8 and R9 are each H, OH, methoxy or sulfoxy. The cpd. (I) is pref. phthalic anhydride or tetrachlorophthalic anhydride, and the cpd. (II) is pref. 7-hydroxycumalin, 6,7-dihydroxycumalin, 5,7-dimethoxycumalin, etc. The compsn. is used for forming a positive image by coating a pre-sensitized aluminium plate.