A PROCESS FOR THE PREPARATION OF MODIFIED MOLECULAR WEIGHT EPOXY RESINS USING PHOSPHONY TETRAHYDROCARBIL SALTS AS CATALYSTS AND MODIFIED MOLECULAR WEIGHT EPOXY RESINS PREPARED BY THE PROCESS

摘要

An improved process for reacting vicinal epoxides with phenols or thiophenols is described. This process is conducted at essentially anhydrous conditions and temperatures less than 175 DEG C. The resulting resins are generally more linear and less colored than advanced resins produced via prior art processes. Also the phosphonium catalyst remains active to promote subsequent advancement or curing reactions. The catalyst can be deactivated in a separate step to produce a resin of exceptional purity.