PRODUCTION OF EPOXY RESIN

PURPOSE:To produce an epoxy resin having narrow molecular weight distribution, low melt viscosity, and high thermal stability and high reactivity with other resins, using only a small amount of catalyst, by reacting an epoxy compound with a polyhydric phenol in the presence of a catalyst comprising...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	TAKUWA NARITSUYO, ARITOMI MICHIO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	PURPOSE:To produce an epoxy resin having narrow molecular weight distribution, low melt viscosity, and high thermal stability and high reactivity with other resins, using only a small amount of catalyst, by reacting an epoxy compound with a polyhydric phenol in the presence of a catalyst comprising a specific phosphonium salt. CONSTITUTION:The objective resin can be produced by reacting (A) an epoxy compound with (B) a polyhydric phenol (preferably bisphenol A or tetrabromobisphenol A) in a proper organic solvent in an inert gas atmosphere at 80- 200 deg.C in the presence of (C) a catalyst comprising the phosphonium salt of formula (X is halogen, one of R1-R4 is residue of epoxy compound having epoxy group and/or hydroxyl group, and the others are phenyl or alkyl) obtained by the reaction of a phosphine with a halohydrin of an epoxy compound, e.g. (di) halohydrin of butyl glycidyl ether, bisphenol-A epoxy resin, etc. The amount of the catalyst is 0.01-0.03wt% of the reaction mixture excluding the solvent.