Patent ID: 8158724

Claim:
A resin transfer molding process, steps of which comprise: (a) providing a heat curable composition into a closed mold containing a preform having a binder composition in contact therewith; (b) exposing the interior of the mold to a first elevated temperature and elevated pressure sufficient to wet the preform with the heat curable composition; and (c) curing the heat curable composition-impregnated preform within the mold at a second elevated temperature to form a resin transfer molded product, wherein the heat curable composition comprises (i) a benzoxazine component and. wherein the binder composition comprises a solid benzoxazine component, which is partially cured by exposure to elevated temperature conditions over time sufficient to increase the melting point higher than the temperature at which the heat curable composition is to be infused into a preform and lower than the point at which the partially cured binder composition and the heat curable composition are miscible.