| abstract |
PURPOSE: A theremosetting polyester resin composition usable for melt or powder coating on magnet wires, having improved smoothness of the resin and film-forming properties, prepared by melt kneading two types of polyester reisns having specific end groups. n CONSTITUTION: (a) An aryl ester of a dicarboxylic acid, e.g. diaryl terephthalate, or its mixture with a tetracarboxylic acid dianhydride, etc. as an acid component is reacted with (b) a polyamine, e.g. phenylenediamine, having amino groups in an amount equimolar with the anhydride groups and hydroxyl groups in a molar amount less than that of the aryl groups in the acid component, and (c) a mixture of hydroxyl compounds, e.g. ethylene glycol, to give (A) a polyester resin having terminal aryl ester groups. The polyester resin is then melt kneaded with (B) a polyester resin having terminal hydroxyl groups to form the desired composition. n COPYRIGHT: (C)1979,JPO&Japio |