MANUFACTURE OF METATHESIS POLYMER MOLDED

PURPOSE:To manufacture a metathesis polymer molded article having no unfilled parts or air voids without obstructing metathesis polymerization or bringing about the lowering of the physical properties of a resin or the appearance deficiencies of the molded article and using gas dangerous from the aspect of work by substituting the air in a cavity with vapor of a norbornene compd. to suppress the generation of air bubbles becoming a problem in the case of 'vacuum molding'. CONSTITUTION:A liquid raw material monomer containing a metathesis polymerization catalyst is injected into the cavity of a mold to be polymerized to produce a cured polymer molded article. In this method, the air in the cavity is preliminarily sucked before the liquid raw material in the cavity of the mold is injected to reduce the pressure in the cavity and, after the air in the cavity is substituted with the vapor of a norbornene compd., the liquid raw material is injected in the cavity of the mold to produce the metathesis polymer molded article. The pressure in the cavity after the air in the cavity is substituted with the vapor of the norbornene compd. is set to 7kPa or more.