| abstract |
SUMMARY OF THE INVENTION The present invention provides a composition comprising one or more density modifiers dispersed in a polymer matrix, wherein the matrix is made by metathesis of an olefin monomer using a ruthenium or osmium metal carbene catalyst. A composition is disclosed. The composition may employ a catalyst of formula (I), wherein M is ruthenium or osmium; X and X 1 may be the same or different and are any anionic ligands; L 1 may be the same or different and are any neutral electron donor; R and R 1 may be the same or different and are each independently hydrogen or C 1 -C 20 alkyl, C 2- C 20 alkenyl, C 2 -C 20 alkynyl, aryl, C 1 -C 20 carboxylate, C 1 -C 20 alkoxy, C 2 -C 20 alkenyloxy, C 2 -C 20 alkynyloxy, aryloxy, C 2 ~ C 20 alkoxycarbonyl, C 1 -C 20 alkylthio, C 1 -C be 20 alkylsulfonyl and C 1 -C 20 alkylsulfinyl substituted group selected from among Le; each of said substituents are substituted It is either unsubstituted there. The density adjusting agent is selected from a metal-based density adjusting agent, a fine particle-based density adjusting agent, and a macroscopic particle-based density adjusting agent. Embedded image |