Producing granular epoxy resin by refining and pulverizing...

Details Producing granular epoxy resin by refining and pulverizing... Producing granular epoxy resin by refining and pulverizing...

2007-02-12

2009-02-17

Sellers, Robert (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C428S130000, C428S137000, C428S138000, C525S480000, C525S523000, C525S524000, C525S525000

Reexamination Certificate

active

07491774

ABSTRACT:
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).

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