PHOSPHORUS-CONTAINING EPOXY RESIN, PHOSPHORUS-CONTAINING EPOXY RESIN COMPOSITION, PROCESS FOR PRODUCING THE SAME, AND SEALING MATERIAL AND LAMINATE EACH COMPRISING OR MADE WITH THE SAME

摘要

A phosphorus-containing epoxy resin has a structural unit derived from a secondary phosphine derivative represented by the following formula: wherein R¹ represents an alkylene group that may have a substituent, R² represents a cycloalkylene or arylene group that may have a substituent, and X represents an oxygen or sulfur atom.