Abstract: A molding process of fiber reinforced plastics which includes:placing fiber reinforcements on a half of a mold which has positive pinch-off edges:positioning the mold halves near to each other to grasp the fibers between the pinch-off edges;injecting a resin into a mold cavity through a resin injection opening provided in the mold; andclosing the mold. This process permits the use of low viscosity resins without the escape of the resin from the mold during the impregnation of fiber reinforcements in the mold cavity, so that the process can readily produce in practical manners fiber reinforced plastics with high fiber contents as much as about 50-80% by weight that have not been achieved by the conventional resin injection and mat or preform matched die molding processes.

Abstract: A cross-linked resin produced by the reaction of a bis(2-oxazoline) compound with a dicarboxylic acid anhydride, and optionally also with at least one selected from the group consisting of a dicarboxylic acid, a hydroxy-carboxylic acid, a diol and water, in the presence of at least one catalyst selected from the group consisting of an organic phosphorous acid ester, an organic phosphonous acid ester and an inorganic salt at an elevated temperature. The cross-linked resin has a high mechanical strength and a high resistance to organic solvents.The resin composition comprising the cross-linked resin and reinforcements and/or fillers combined therewith has outstanding heat-resistance and mechanical properties.

Abstract: A cross-linked resin produced by the reaction of a bis(2-oxazoline) compound with a dicarboxylic acid anhydride, and optionally also with at least one selected from the group consisting of a dicarboxylic acid, a hydroxy-carboxylic acid, a diol and water, in the presence of at least one catalyst selected from the group consisting of an organic phosphorous acid ester, an organic phosphonous acid ester and an inorganic salt at an elevated temperature. The cross-linked resin has a high mechanical strength and a high resistance to organic solvents.The resin composition comprising the cross-linked resin and reinforcements materials and/or fillers combined therewith has outstanding heat-resistance and mechanical properties.