FLAME-RESISTANT POLYURETHANE IMIDE RESIN, RESIN COMPOSITION THEREOF AND CURED FILM

摘要

Disclosed is a polyurethane imide resin having improved flame resistance. Also disclosed are a resin composition of the polyurethane imide resin, and a cured film. Specifically disclosed is a polyurethane imide resin containing a soft segment composed of a polycarbonate polyol and a hard segment having an imide bond. The polycarbonate polyol contains a structural unit (I) represented by the following formula: -OCOO-, and a structural unit (II) represented by a residue A (an n-valent reside which is obtained by removing n alcoholic hydroxyl groups from a phosphorus compound having at least n alcoholic hydroxyl groups, wherein n is an integer of not less than 2), while having an alcoholic hydroxyl group at an end.