| 摘要 |
PROBLEM TO BE SOLVED: To realize electric physical properties and mechanical physical-properties equivalent to or better than a conventional polymer product using a bisphenol A type epoxy resin without worsening working efficiency, and to contributes to global environment conservation. SOLUTION: Lignin extracted from plant biomass is epoxidized , and a hardening agent etc. is properly added to the epoxidized lignin and heated for three dimensional crosslinking to obtain the insulating polymeric material composition. The lignin is extracted from plant biomass, for example, by steaming and blasting, and the epoxidized lignin is obtained by glycidyl-etherification reaction of the extracted lignin and epichlorohydrin under a high alkalization atmosphere. COPYRIGHT: (C)2006,JPO&NCIPI
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