Patent ID: 7285602

Claim:
A granular epoxy resin as a granular matter of an epoxy resin which is solid at ordinary temperature and 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), wherein at least 50% by mass of the entire epoxy resin consists of at least one oligomer of n 1 =0 in the following general formula (1) and having a molecular weight of 500 or less and/or at least one oligomer of n 2 =0 in the following general formula (2) and having a molecular weight of 500 or less; and the total content of compounds having a molecular weight of 200 or less is 0.3% by mass or less of the entire epoxy resin; wherein in formula (1) hereinabove, G is a glycidyl group; R 1 is a hydrocarbon group having from 1 to 10 carbon atoms and each R 1 can be the same or different; X is a divalent hydrocarbon group having from 1 to 18 carbon atoms, —O—, —S—, or a group represented by the following general formula (3) and each X can be the same or different; wherein G is a glycidyl group; is a hydrogen atom or a hydrocarbon group having from 1 to 5 carbon atoms; p 1 is an integer between 0 and 4 and each p 1 can be the same or different; n 1 is an integer between 0 and 10; wherein in formula (2) hereinabove, R 2 is a hydrocarbon group having from 1 to 10 carbon atoms and each R 2 can be the same or different; Y is a divalent hydrocarbon group having from 1 to 18 carbon atoms, —O—, —S—, —CO—, —SO 2 —, or a direct bond and each Y can be the same or different; p 2 is an integer between 0 and 4 and each p 2 can be the same or different; n 2 is an integer between 0 and 10.