PROCESS FOR PREPARING EPOXY RESINS HAVING IMPROVED PHYSICAL PROPERTIES WHEN CURED

This invention is directed to a process for advancing epoxy resins in molecular weight and to a process for preparing resin impregnated substrates in which an epoxy resin is reacted with a dihydric phenol in the presence of a sufficient quantity of a phosphonium catalyst such that the product result...

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Bibliographische Detailangaben
Hauptverfasser:	DOORAKIAN, GEORGE A, WHITESIDE, ROSS C., JR, GIST, ADOLPHUS V
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS 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
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Beschreibung
Zusammenfassung:	This invention is directed to a process for advancing epoxy resins in molecular weight and to a process for preparing resin impregnated substrates in which an epoxy resin is reacted with a dihydric phenol in the presence of a sufficient quantity of a phosphonium catalyst such that the product resulting from reacting a mixture of the catalyst, epoxy resin and dihydric phenol has a percent epoxide difference from the theoretical percent epoxide of from 0.5 to 4.0. 29,210-F 29,210-F