METHOD FOR PRODUCTION OF PHOTOPOLYMERIZED COMPOSITION FOR PROTECTIVE RELIEFS Russian patent published in 1995 - IPC

FIELD: production of photographic materials. SUBSTANCE: method for production of photopolymerized composition for protective reliefs includes two-stage condensation, first, 100 mas.p. of epoxy resin with 18.7-50 mas.p. of adipic acid in the presence of 5-8 mas.p. of Michler's ketone with CrCl₃ (ratio 10.0:1); 150 mas.p. of epichlorohydrin and 0.3-1 mas.p. of hydroquinone, and then, condensation of epichlorohydrine and methacrylic acid (160-264 mas. p.). First stage lasts for 50-60 min at 100 C and the second stage conducted at 95-105 C lasts up to attainment of acid number of 0.2-12 mg KOH/kg and epoxy number of 0.11-1.2 mas.%. Epoxy resin is used in form of mixture of epoxides with formulas I and II indicated in invention description. In this case, mixture of formula I has mol.wt of 340 and content of epoxy groups of 25.3 mas.%; and mixture formula 11 has mol.wt of 624 and content of epoxy groups of 13.8 mas.% with mass ratio of 2.5:1. EFFECT: increased photosensitivity of composition by 31.5-66.7% with reduced duration of process from 10-15 to 6-8 h and higher efficiency. 1 tbl