Lignin Utilization II — Resin Properties of 4-Alkyl Substitutes Catechol Compounds

Four-methylcatechol was tested as a resin monomer and found to produce an excellent formaldehyde resin. This result is in marked contrast with the 4-alkyl substituted guaiacol compounds obtained directly from hydrogenolysis of softwood lignin. Four-propyl and 4-propanolcatechol were found to be unsuitable as resin monomers. Using vapor pressure osmometry, number average molecular weights (namw) were measured for actechol-formaldehyde resins. Four-methyl and 4-propanolcatechol-formaldehyde resins had namw’s of 3,000 and 4,500, respectively, whereas 4-propylcatechol-formaldehyde resin had a much lower namw of 700. Addition of 10 weight percent of either 4-methyl or 4-propylcatechol-formaldehyde resin to a commercial phenol-formaldehyde resin increased the reactivity of the resin.

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