FILTER PLATE

PURPOSE:To provide a filter plate with good size precision and high durability and heat resistance by injecting a liquid resin composition containing a metathesis catalyst and norbornene-based monomer at a specified ratio into dies for forming filtration plates to give norbornene-based monomer bulk polymer and at the same time to from the polymer. CONSTITUTION:A liquid resin composition containing a metathesis catalyst and 50wt.% or more of norbornene-based monomer is injected into filter plate forming dies consisting of a male type die and a female die to make norbornene- based monomer bulk polymer and at the same time to form the polymer and thus a filter plate is obtained. Since the dies' necessary temperature at the time of polymerizing and forming is low (about 250 deg.C or lower), the temperature difference of the resin surface and the center part at the time of forming is small and consequently cracks are hardly formed inside a formed article. As a result, size precision of the formed article is good. The norbornene-based monomer bulk polymer has high strenght, waterproofness, resistance to chemicals as well as heat resistance and the polymer can be adhesion-mended with an adhesive.