| 摘要 |
PCT No. PCT/EP95/04363 Sec. 371 Date May 22, 1997 Sec. 102(e) Date May 22, 1997 PCT Filed Nov. 6, 1995 PCT Pub. No. WO96/16104 PCT Pub. Date May 30, 1996Process for the photocatalytic polymerization of a cyclic olefin or at least two different cyclic olefins in the presence of a metal compound as catalyst, which comprises carrying out a photochemical ring-opening metathesis polymerization in the presence of a catalytic amount of at least one heat-stable niobium(V) or tantalum(V) compound which contains at least two methyl groups or two monosubstituted methyl groups bound to the metal, the substituent containing no hydrogen atom in the alpha -position. The process can also be carried out by first performing the irradiation and completing the polymerization by heating. The process is suitable, for example, for the preparation of thermoplastic molding materials, coatings and relief images.
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