Hydroquinone → 1,2-Diethenylbenzene

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A reactor is charged with 600 g of an epoxy resin prepared from dicyclopentadiene and phenol having an average functionality of about 3.2 and an epoxide equivalent weight (EEW) of 265. The resin is heated at 120° C. for 1 hour with 0.43 g of a 70 weight percent methanolic solution of ethyltriphenylphosphonium acetate.acetic acid complex catalyst with a nitrogen sparge. To the resulting mixture is added 200 g of the diglycidyl ether of bisphenol A having an EEW of 179 thereby forming a homogeneous solution having an EEW of 208. The mixture of epoxy resins is reacted catalytically with a stoichiometric equivalent amount (322 g) of glacial methacrylic acid in the presence of air and 400 ppm hydroquinone at 100° C. to 115° C. until a 1.1% acid concentration is reached. The vinyl ester resin is dissolved in 508 g of styrene and 127 g of divinyl benzene to yield a blend containing about 36 percent monomeric diluent by weight. The diluent contained 80% by weight styrene and 20% by weight divinylbenzene.

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