nonwoven fabric and the like the rubber like crosslinked molded polymer article used in the present invention may also contain an antioxidant preferably a phenolic or amine antioxidant is added to the solution in advance examples of the antioxidants include 2 6 t butyl p cresol n n 39 diphenyl p phenylenediamine and tetrakis methylene 3 5 di t butyl 4 hydroxycinnamate methane the reactive solutions a and b for the production of the crosslinked molded polymer article by the present invention are preferably introduced into the mold in the form of laminar flow to prevent the inclusion of bubbles to realize the laminar flow a proper viscosity corresponding to the injection speed is necessary and the addition of a thickener to either one or both of solutions a and b is frequently required the material usable as the above thickener is a polymer which is soluble in the monomer or in the liquid hydrocarbon or partially halogenated liquid hydrocarbon is free from inhibitory action to metathesis polymerization does not cause deterioration of the characteristic properties of the article and preferably imparts desirable properties to the article the polymer usable for the above purpose is preferably a non crosslinked hydrocarbon elastomer such as styrene butadiene styrene triblock rubber styrene isoprene styrene triblock rubber polybutadiene polyisoprene butyl rubber ethylene propylene diene terpolymer and the like as described above the molded polymer articles of the present invention are prepared by simultaneous polymerization and molding the molding method includes as mentioned above a resin injection process comprising the proper mixing of a.