Resin composition and its manufacturing method

Abstract

The resin composition provided by this invention effectively utilizes lignin, a biomass derived from plants, allowing the modified lignin to be dispersed or dissolved in the resin in a favorable state, resulting in excellent manufacturing and processability. The resin composition of this invention contains modified lignin and resin; the modified lignin is an alkyl-etherified lignin in which at least a portion of the aromatic hydroxyl groups of lignin is etherified using at least one alkyl group selected from the group consisting of straight-chain alkyl groups with 4-22 carbon atoms, branched alkyl groups with 4-22 carbon atoms, cycloalkyl groups with 4-22 carbon atoms, and aralkyl groups with 7-22 carbon atoms; the sulfur atom content of the modified lignin is less than 0.2% by mass; the lignin content constituting the modified lignin, based on the total lignin and alkyl groups, is 50-90% by mass; the number average molecular weight of the modified lignin is 800-10,000.

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