The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2022
Filed:
Mar. 15, 2019
Nippon Steel Chemical & Material Co., Ltd., Tokyo, JP;
Koichi Hattori, Tokyo, JP;
Naoki Yokoyama, Tokyo, JP;
NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo, JP;
Abstract
Provided is a polyurethane-modified epoxy resin composition having satisfactory operability of processing, such as casting or impregnation, in a composition state. The epoxy resin composition includes, as essential components, the following components (A) to (D): (A) a low-concentration polyurethane-modified epoxy resin containing a polyurethane having an epoxy resin added to each of both terminals thereof and/or one terminal thereof; (B) a polyurethane-unmodified epoxy resin that is liquid at 30° C.; (C) a solid epoxy resin having a bisphenol structure, the resin having a glass transition temperature or a melting point of 50° C. or more; and (D) an amine-based curing agent that is dicyandiamide or a derivative thereof, wherein the epoxy resin composition includes the component (A) at from 3.0 wt % to 30.0 wt %, and the component (C) at from 0.1 wt % to 40.0 wt % with respect to the total of the components (A) to (D).