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1. (WO2018005045) STORAGE STABLE EPOXY PREPREGS FROM DICYANDIAMIDE SOLUTIONS AND METHODS FOR MAKING THE SAME

Pub. No.:    WO/2018/005045    International Application No.:    PCT/US2017/036791
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Sat Jun 10 01:59:59 CEST 2017
IPC: C08J 5/24
C08G 59/50
C08L 63/00
Applicants: DOW GLOBAL TECHNOLOGIES LLC
Inventors: BALIJEPALLI, Bharati
BANK, David H.
TURAKHIA, Rajesh H.
Title: STORAGE STABLE EPOXY PREPREGS FROM DICYANDIAMIDE SOLUTIONS AND METHODS FOR MAKING THE SAME
Abstract:
The present invention provides thermosetting resin pre-impregnated or infused fiber materials or prepregs comprising a fiber material of a heat resistant fiber, such as a continuous fiber material or a discontinuous chopped fiber mat, infused with a thermosetting resin mixture comprising (i) at least one liquid epoxy resin; (ii) at least one epoxy novolac resin, (iii) dicyandiamide and (iv) and an adduct of a cycloaliphatic amine and a liquid epoxy resin, wherein the dicyandiamide is dissolved in the adduct of a cycloaliphatic amine and a liquid epoxy resin. The prepreg or fiber material has a shelf life of at least 30 days at ambient temperature and pressure before its Initial Tg (DSC) rises above 40 °C.