PROCESS FOR PRODUCING BASIC IRON(III)-CARBOXYLATES OF VARIABLE PHOTOSENSIBILIZING ACTIVITY AND POLYMER COMPOSITIONS CONTAINING THESE COMPOUNDS, DECOMPOSING UNDER INFLUENCE OF SUNLIGHT AND HAVING REGULABLE LIFETIME

摘要

Basic Fe(III) carboxylate cpd. for photosensitising polyolefin and polystyrene polymers is prepd. from a water sol. Fe(III) salt and an R-COOH carboxylic acid, where R = 5-20C alkyl gp., 20-24C alkenyl gp., 2-5C alkyl or alkenyl gp. substd. by a phenyl gp. or a phenyl gp. substd. with 1-4C alkoxy gp., A 1-8 wt.% alkali hydroxide soln. is prepd. up to an equimolar quantity of the R-COOH acid is added to the hydroxide. Based on 1 mol. of the carboxylic acid, 0.4-0.6 mol. Fe(III) salt is added in an aq. soln. at 70-90 deg.C. A buffer is added when the pH falls to pH 9 during addn. of Fe(III) salt. Finally pH values are allowed to fall to 8-5 on completion of the reaction and the pptd. prod. is isolated. - The invention also applies to polymer master batches and compsns. contg. photosensitisers of this type.(Dwg.0/1)