Sumitomo Bakelite Company Limited

Taketoshi Murai

Mitsutaka Matsumoto

Hiroshige Nakagawa

A lignin derivative that is extracted from biomass and is used for rubber reinforcement or for use in a molding material is provided. Such a lignin derivative has a number average molecular weight of 300 to 2,000, and contains a component that is soluble in a polar organic solvent, in an amount of 80% by mass or more. When such a lignin derivative is incorporated, a lignin resin composition, a rubber composition, or a molding material, all of which have excellent low hysteresis loss characteristics, elastic modulus, or tensile properties, can be obtained. Furthermore, when a component that is thermofusible is used as the soluble component, a lignin resin composition, a rubber composition, or a molding material, all of which have superior aforementioned characteristics, can be obtained.

Lignin derivative, lignin resin composition, rubber composition, and molding material

Provided is a lignin resin composition including a lignin derivative having a weight-average molecular weight of 500 or more and 4000 or less and a novolac-type phenolic resin having a weight-average molecular weight of 1000 or more and 3000 or less, in which the content of the lignin derivative is not higher than the content of the novolac-type phenolic resin. In particular, the cured product (molded product) of a lignin resin composition obtained by melt-mixing such a lignin resin composition, adding hexamethylenetetramine thereto and then heating the resulting mixture has a high bending strength. Such a lignin resin composition is utilizable as a thermosetting resin substituting a phenolic resin.

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Tokyo, Japan

Taketoshi Murai