Inventors:
Daniel R. Sassano - Monroeville PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
C08L 6706
Abstract:
Disclosed is a method of making a non-aqueous solventless polyester varnish. A composition is prepared which comprises about one mole of maleic anhydride, about 0. 25 to about 0. 35 mole of dicyclopentadience, about 0. 65 to about 0. 75 mole of ethylene glycol, and about 0. 35 to about 0. 45 mole of a polyol. The composition is heated to about 150. degree. to about 170. degree. C. , and then to about 200. degree. to about 210. degree. C. , which condenses out water, forms an unsaturated polyester and, reduces the acid number to less than about 45. The composition is cooled to a temperature below about 150. degree. C. , and about 0. 1 to about 0. 5% of an inhibitor is added to said composition, followed by an unsaturated aromatic compound which can be styrene, vinyl toluene, or mixtures thereof, in a ratio of about 20 to about 40 pbw unsaturated aromatic compound to about 60 to about 80 pbw unsaturated polyester. When it is desirable to use the composition, 0. 5 to about 1.