1-Naphthol → 1-Naphthol methylene-p-cresol

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A mixture comprising of 72.1 g 1-naphthol, 84.1 g 2,6-bis(hydroxymethyl)-p-cresol, 5.0 g oxalic acid dihydrate and 150 ml ethyl cellosolve acetate in a 0.5-L resin kettle, equipped as in Example 1, was heated to initiate the condensation reaction substantially forming the 1-naphthol-methylene-p-cresol alternating copolymer. An exothermic reaction resulted, reaching a peak temperature of about 120° C. The reaction mixture was allowed to reflux for about 2 hours, 108.1 g m-cresol and 48.8 g of 36.9 percent formaldehyde were added, and the condensation mixture again allowed to reflux for about 2 hours. The volatiles present in the reaction mixture were removed by distillation and stripping as described in Example 1. About 201 g of a block copolymer having a number average molecular weight, Mn, of 1940 Daltons and a Tg of about 121° C. were obtained.

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