Light-Sensitive Polymers and their use in the preparation of Photographic Printing Plates

摘要

1,180,845. Oximes. GEVAERT-AGFA N.V. 12 July, 1968 [8 Aug., 1967], No. 36393/67. Heading C2C. [Also in Divisions C3 and G2] The preparation of the following oximes is illustrated: (a) 1 - (p - Hydroxyphenyl) - 1,2 - propanedione- 2-oxime is prepared by treating p-hydroxypropiophenone in ether with butyl nitrite and HCl gas, extracting with aqueous NaOH and precipitating the product in cold aqueous HCl; (b) p - Hydroxyphenylglyoxal-aldoxime is prepared by (i) heating p-hydroxyacetophenone with selenium dioxide in dioxan/water to form p-hydroxyphenylglyoxal hydrate which is purified with animal charcoal, and (ii) treating an ethanol solution of this product with an aqueous hydroxylamine hydrochloride solution in the presence of NaOH; (c) 2,3 - Butanedione - mono - (O -methacrylyloxime) is prepared by adding methacryloyl chloride dropwise to a methylene chloride solution of diacetylmonoxime containing pyridine.