Heat-resistant adhesive lacquers as wire coatings

Claim 1

A heat-curable adhesive lacquer for coating electrically insulated wires consisting essentially of: 1. a polyurethane-ester-imide having terminal isocyanate groups blocked by a monohydric phenol, said polyurethane-ester-imide being derived from (A) an ester-imide containing hydroxyl groups obtained from a dicarboxylic acid of the formula: ##SPC6## and a polyalcohol of the formula: HOCH.sub.2 --CH.sub.2 --O--CH.sub.2 --CH.sub.2 --O--CH.sub.2 --CH.sub.2 OH (b.sub.1) and of the formula: ##SPC7## in the molar ratios: a : (b 1 + b 2 ) = 1 : 1.2 to 1 : 2 b 1 : b 2 = 1 : 1 to 10 : 1 and (B) a polyisocyanate of the formula: ##SPC8## ##SPC9## or a mixture of two or more thereof and the ratio of the hydroxyl groups to the isocyanate groups is from 1 : 1 to 1 : 1.5 and 2. an essentially linear epoxide resin having secondary hydroxyl groups and a molecular weight of at least 30,000, the lacquer, on drying, being a storage-stable at room temperature and being in a non-adhesive state such that the lacquer softens on further heating to give a thermoset, adhesive, heat-stable resin.