METHOD FOR PREPARING BINDING AGENT FOR DRY FILM PHOTORESIST OF AQUEOUS-ALKALINE DEVELOPMENT Russian patent published in 2006 - IPC C08F212/08 C08F222/06 G03F7/09 

FIELD: chemical technology.

SUBSTANCE: invention relates to a method for preparing a binding agent for a dry film photoresist of aqueous-alkaline development used in preparing a picture in making printed boards in radio- and electronic industry and as a component of paint and varnish covers and glues. Invention describes a single-step method for preparing a binding agent for a dry film photoresist of aqueous-alkaline development. At the first step method involves the copolymerization reaction of styrene with maleic anhydride in acetone medium in the presence of azo-bis-isobutyric acid dinitrile and hydroquinone at temperature 54-72°C for 2.5-3.0 h. At the second step method involves addition of 28.0-32.0 mas. p. p. of n-butanol to the reaction mixture and distilling off of 15.0-20.0 mas. p. p. of acetone followed by carrying out esterification of the copolymerization product at temperature 64-74° for 90-120 h. Prepared dry film photoresists of aqueous-alkaline development possess high stability (9-10 h) and enhanced galvanic-chemical resistance.

EFFECT: improved preparing method, improved and valuable properties of binding agent.

1 tbl, 6 ex