Phosphorus-containing epoxy resin, phosphorus-containing epoxy resin composition, process for producing the resin, sealant containing the composition, molding material containing the composition, and laminate containing the composition

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.