Japan Epoxy Resins Co., Ltd.

Akihiro Itou

Atsuhito Hayakawa

Yasuyuki Murata

A production method of granular epoxy resin includes an epoxy resin preparing step of preparing an epoxy resin which is solid at ordinary temperature by reaction between a phenol compound and epihalohydrin; a purifying processing step of refining the prepared epoxy resin which is solid at ordinary temperature so that the total content of compounds having a molecular weight of 200 or less is 0.28% by mass or less of the entire epoxy resin; and a pulverizing step of pulverizing the refined epoxy resin obtained by the purifying processing step under conditions so as not to make the total content of compounds having a molecular weight of 200 or less exceeding 0.3% by mass, wherein the epoxy resin which is solid at ordinary temperature prepared by the epoxy resin preparing step is mainly composed of at least one selected from oligomers represented by the following general formula (1) and oligomers represented by the following general formula (2). 

Producing granular epoxy resin by refining and pulverizing solid epoxy resin

The present invention relates to an epoxy compound, represented by a general formula (I), which is solid at ordinary temperature, has extremely low melt viscosity and has excellent curing property and which can provide a cured product which is excellent in mechanical strength, heat resistance, and moisture resistance. It also relates to a preparation method of the epoxy compound, an epoxy resin composition, and a cured product thereof. The epoxy compound is represented by the following general formula (I): (wherein R-Reach represent hydrogen atom or alkyl group having 1-6 carbon atoms, and n represents an integer of 0 or more).

Epoxy compound, preparation method thereof, and use thereof

An epoxy compound, represented by a general formula (I) is obtained by reacting an anthrahydroquinone compound having a following general formula (II) with epihalohydrin. (wherein R-Reach represent hydrogen atom or alkyl group having 1-6 carbon atoms, and n represents an integer of 0 or more, and wherein A, Aeach represent hydrogen atom or alkali metal atom, R-Reach represent hydrogen atom or alkyl group having 1-6 carbon atoms.)

A granular epoxy resin is made by pulverizing an epoxy resin which is solid at ordinary temperature and can exhibit excellent fluidity during molding because of its low melt viscosity in which the total content of components having a molecular weight of 500 or less among components of n=0 in the following general formula (1) and/or components of n=0 in the following general formula (2) is 50% by mass or more of the entire epoxy resin, or, the total content of components having a molecular weight 400 or less among components of n=0 in the following general formula (1) and/or components of n=0 in the following general formula (2) is 20% by mass or more of the entire epoxy resin. The content of low molecular weight compounds having a molecular weight 200 or less in the granular epoxy resin is 0.3% by mass or less. The granular epoxy resin allows easy handling because it hardly causes blocking during storage and transportation 

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Yokkaichi, Japan

Akihiro Itou