O-CRESOL NOVOLAK TYPE EPOXY RESIN WITH HIGH SOFTENING POINT, AND PRODUCTION OF EPOXY RESIN SOLUTION AND EPOXY RESIN COMPOSITION EACH CONTAINING THE SAME AND THE EPOXY RESIN

摘要

PROBLEM TO BE SOLVED: To obtain an epoxy resin useful as a varnish for laminates, an epoxy resin for coating materials or a material for hot-melt type adhesives-by including an o-cresol novolak skeleton as the main skeleton and setting its softening point at a specific value or higher. ;SOLUTION: This epoxy resin is such one as to contain an o-cresol novolak skeleton as the main skeleton and have a softening point of ≥100°C. This epoxy resin is obtained by reacting an o-cresol novolak type epoxy resin having a softening point of 60 to 98°C with a 1/30 to 1/9 equivalent of a bifunctional phenolic compound [e.g. methylenebis(o-cresol)]. The above mentioned reaction is desirable to be conducted in an organic solvent such as methyl ethyl ketone, in the presence of a phosphorus-based catalyst such as triphenylphosphine at 60 to 150°C normally for about 1 to 15 h.;COPYRIGHT: (C)2001,JPO