Catalyst-doped sizing agent for preparation of high areal weight fiber shelf-stable prepreg or molding compound intermediates
The present invention provides thermosetting resin pre-impregnated or infused fiber materials or prepregs comprising a thermosetting resin mixture and a fiber material component of a heat resistant fiber, such as carbon fiber, having an areal weight of from 500 to 3,000 g/m2 having a coating of from 0.5 to 4 phr of a latent, particulate curative or solid curative, preferably, dicyandiamide, wherein the prepregs are infused with a thermosetting resin mixture comprising (a) at least one liquid epoxy resin, and (b) a hardener and/or a catalyst, as well as methods of making the same. The prepregs of present invention enables the simple provision of lightweight composites having consistent resin cure throughout.
Dow Global Technologies LLC
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Jun Marsha L. Abhijit A. Kevin J. Richard Weijun David H.
Cai Langhorst Namjoshi Bouck Baumer Wang Bank