| abstract |
1,227,602. Diazide - containing sulphonate esters of phenolic resins. POLYCHROME CORP. 9 Dec., 1968 [24 Nov., 1967], No. 53534/67. Heading C3R. [Also in Division G2] Water-insoluble esters of resins containing phenolic hydroxy groups and naphtho- or benzo - quinone - (1,2) - diazide sulphonic acids with 5-35% of the hydroxyl groups esterified are prepared by reacting the resin and diazide (as the sulphochloride) in the presence of lithium hydroxide. The specified resin is o - cresolformaldehyde resin and the specified diazide is 1, 2 naphthaquinone - diazide - 5 - sulphonyl chloride and the ester produced is one containing 20% esterified hydroxyl groups. The esters are used in photosensitive materials (see Division G2). |