METHOD FOR PRODUCTION OF PHOTOPOLARIZED COMPOSITION Russian patent published in 1995 - IPC

FIELD: polygraphy and radio engineering. SUBSTANCE: composition is produced by reaction of 1-2-basic carboxylic acids with epoxy compounds containing in molecule two glycide radicals in the presence of catalyst -4,4'-bis-(dimethylamino) benzophenone and inhibitor of radical polymerization of hydroquinone when heated. 1-2-basic carboxylic acids are used in form of(meth)acrylic and adipic acids, and epoxy compounds are used in form of mixture of compounds with formulas I and II indicated in invention description and taken in ratio of 1-5:1 with content of epoxy groups of 25.3 and 13.8 mas.% and mol.wt of 340 and 624. Reaction is carried in medium of diluent of di-(2-ethyl hexyl)sebacate at 60-100 C. Amount of components in mixture, mas. p. (meth)acrylic acids 144-216; adipic acid 123-220; mixture of indicated epoxy compounds 647-1230; 4,4'-bis-(dimethylamino)benzophenone 7.8-18; hydroquinone 0.5-2.5; di-(ethylhexyl)sebacate 80-160. Reaction is conducted to attain acid number of 0.1-12 mg KON/g and content of residual epoxy groups of 0.03-1.3 mas.%. Then, reaction mixture is cooled down to 40-60 C and methylene chloride or acetone in the amount of 500-800 mas.p. is introduced. EFFECT: reduced viscosity of reaction medium, higher photoresistivity and increased flexibility in photohardened state. 1 tbl