Epoxy resins from substituted benzoic acids–formaldehyde resins


  • Presented at 14th Annual Meeting of Gosei Jushi Kogyo Kyokai on Thermosetting of Resins, Osaka, Sept. 1964.


Some polybasic acid derivatives were obtained from substituted benzoic acids such as p- and o-toluic acids, and p-formaldehyde in concentrated sulfuric acid by a method similar to that of Naokawa et al. The structure of these resinous substituted benzoic acid–formaldehyde materials was determined by a paper chromatography and infrared spectrum analysis, and found to be

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where n = 0–2; R = H, R′, and R″ = H or CH3, respectively. New glycidyl-ester-type epoxy resins were prepared from these substituted benzoic acid–formaldehyde resins and epichlorohydrin in the presence of sodium hydroxide, using dioxane as a solvent. These resins were considered to have the general structure shown above, where n = 0–2, equation image, and R′ and R″ = H or CH3, respectively.