Method for synthesizing imide group modified low-molecular-weight line-type phenolic resin and sensitization imaging composition containing imide group modified low-molecular-weight line-type phenolic resin

The invention relates to a method for synthesizing imide group modified low-molecular-weight line-type phenolic resin. The method includes the following steps: in N, N-dimethyl formamide or a mixing solution mainly containing the N, N-dimethyl formamide, paraaminophenol reacts with anhydride in dicarboxylic acid to obtain an amide carboxylic acid phenolic compound; under catalysis of acid catalysts like oxalic acid, the amide carboxylic acid phenolic compound and 2, 6-dihydroxytoluene paracresol have polycondensation and a dehydration ring closing reaction to obtain the imide group modified low-molecular-weight line-type phenolic resin. The invention further comprises a sensitization imaging composition containing the modified phenolic resin. The sensitization imaging composition comprises the modified phenolic resin, film-forming resin, an optical active compound, a background dye and the like; the modified phenolic resin has the excellent alcohol-resisting performance, an alkali developing solution has the high dissolution-promotion performance, and therefore an obtained board has the high alcohol-resisting performance, the high sensitivity and the high resolution ratio.