| 摘要 |
PURPOSE:To prepare a polymer molding which accurately reproduces a complicated shape of a mold and has excellent physical properties in producing the polymer molding from a metathesis-polymerizable monomer by introducing the monomer contg. a blowing agent dissolved therein into the mold in the presence of a metathesis polymn catalyst, and polymerizing and molding the monomer. CONSTITUTION:A polymer molding is prepd. by introducing a metathesis- polymerizable monomer into a mold in the presence of a metathesis polymn. catalyst and conducting the polymn., molding and foaming of the monomer simultaneously. The density of the resulting molding lies between 0.82A and 0.96A, wherein A means the maximum attainable density with the molding, i.e., the density when no bubble exists in it, varying with the monomer used. The blowing agent used includes an inert gas, a low-boiling org. solvent, and a chemical blowing agent. |
