characteristic was evaluated the results indicated that no variation in patterning characteristic was observed even after the solution had been stored for two weeks a vinyl acetate polymer polymerization degree 600 saponification degree 70 100 g was dissolved in water 388 g and to the solution n methyl u03b3 p formylstyryl pyridinium metosulfate 15 9 g and metanesulfonic acid 2 g were added followed by stirring at 30 u00b0 c for six hours subsequently propylene glycol 259 g and benzaldehyde 13 4 g were added to the reaction mixture followed by further stirring at 30 u00b0 c for 14 hours ion exchange resin amberlyst ira 45 product of rohm amp haas co 36 ml was added to the solution and the resultant mixture was stirred at 50 u00b0 c for four hours to thereby neutralize the solution then the ion exchange resin was removed from the mixture through filtration subsequently propylene glycol 607 g and cyclohexane 50 g were added to the filtrate and the resultant mixture was subjected to azeotropic dehydration at 74 u00b0 c cyclohexane was removed from the mixture through distillation at 81 u00b0 c to thereby obtain a photosensitive resin solution in propylene glycol the resin in the solution was analyzed through nmr spectrometry and the results revealed that the amount of added sbq was 2 1 mol and that of added n benzaldehyde was 5.