Abstract: Using a polymerization catalyst comprising as a main ingredient a metal compound containing a transition metal of group 6 of the periodic table and having at least one imide group and at least two substituent (A) selected from the group consisting of an alkoxy group, an aryloxy group, an alkylamide group and an arylamide group, a polycyclic norbornene monomer is polymerized to give a ring-opened norbornene polymer having a weight average molecular weight of 500 to 1,000,000 as expressed in terms of polystyrene and a melting point of 140° C. or higher. This polymer is hydrogenated to give a hydrogenated product having a melting point of 140° C. or higher.

Abstract: A process for producing a hydrogenated product of a polymer prepared through ring-opening polymerization which comprises a polymerization step of polymerizing a cyclic olefin through ring-opening polymerization in the presence of a polymerization catalyst comprising an organoruthenium compound or an organoosmium compound to prepare a polymer, and a hydrogenation step of adding a hydrogenation catalyst and hydrogen into a polymerization system resulting from the polymerization step to hydrogenate the carbon-carbon double bonds of the polymer prepared through the ring-opening polymerization. When the organoruthenium compound- or organoosmium compound-containing catalyst further comprises a carbene compound, the catalyst exhibits a higher activity for the ring-opening polymerization.

Abstract: A ring-opened metathesis copolymer formed by the ring-opening metathesis copolymerization of a cyoloolefin monomer having a carboxylic anhydride group selected from bicycloheptene derivatives, tetracyclododecene derivatives and hexacycloheptadecene derivatives with a cycloolefin monomer selected from bicycloheptene derivatives, tetracycloheptene derivatives and hexacycloheptene derivatives; and a hydrogenation product of the copolymer. This copolymer is produced by using a polymerization catalyst comprises an organoruthenium compound having a heterocyclic carbene compound as a ligand. The ring-opened metathesis copolymer and the hydrogenation product thereof have a low dielectric constant, a low water absorption, a high adhesion to metals and a high heat resistance.

Abstract: A norbornene resin composition comprising 100 parts by weight of a thermoplastic norbornene polymer and 1 to 150 parts by weight of a thermosetting resin.

Abstract: A process for producing a hydrogenated product of a polymer prepared through ring-opening polymerization which comprises a polymerization step of polymerizing a cyclic olefin through ring-opening polymerization in the presence of a polymerization catalyst comprising an organoruthenium compound or an organoosmium compound to prepare a polymer, and a hydrogenation step of adding a hydrogenation catalyst and hydrogen into a polymerization system resulting from the polymerization step to hydrogenate the carbon-carbon double bonds of the polymer prepared through the ring-opening polymerization. When the organoruthenium compound- or organoosmium compound-containing catalyst further comprises a carbene compound, the catalyst exhibits a higher activity for the ring-opening polymerization.

Abstract: A curable resin composition comprising a modified cycloolefin addition polymer (A) obtained by introducing a functional group into a cycloolefin addition polymer containing a repeating unit (a) derived from a cycloolefin monomer having an organic group having at least 4 carbon atoms at its side chain at a rate of introduction of the functional group of 0.1 to 50 mol % based on the whole repeating unit of the cycloolefin addition polymer, and a hardening agent (B), and a modified cycloolefin addition polymer (A) obtained by introducing a functional group into a cycloolefin addition polymer containing a repeating unit (a) derived from a cycloolefin monomer having an organic group having at least 4 carbon atoms at its side chain at a rate of introduction of the functional group of 0.1 to 50 mol % based on the whole repeating unit of the cycloolefin addition polymer, and having a weight average molecular weight (Mw) of 1,000 to 1,000,000.

Abstract: A thermoplastic norbornene resin having a number-average molecular weight (Mn) of 12,000 or more in terms of polyisoprene value measured by gel permeation chromatography and excellent in low birefringence property and resistance to deterioration with greases and oils is obtained by ring-opening polymerizing a polycyclic norbornene monomer containing at least 70% by weight of a norbornene monomer represented by the following formula I (for example, 1,4-methano-1,4,4a,9a-tetrahydrofluorene): ##STR1## (wherein the lower 6-membered ring structure may have a double bond) and hydrogenating the polymer so that the hydrogenation rate of double bond in the main chain is at least 98% and the hydrogenation rate of the 6-membered ring structure is at least 90%.

Abstract: The present invention provides a method for hydrogenating a metathesis polymer solution obtained by polymerization in the presence of a metathesis polymerization catalyst comprising (a) the catalyst component of a transition metal compound and (b) the co-catalyst component of a metal compound by bringing the above solution into contact with hydrogen, without adding an inactivating agent for the metathesis polymerization catalyst, that is, with the solution left to contain the catalyst, in the presence of a hydrogenation catalyst comprising a transition metal compound (c) and a reductive metal compound (d) and if necessary by adding an acid-binding compound.

Abstract: A method of producing a polymer of a cationically polymerizable vinyl monomer by polymerizing at least one cationically polymerizable vinyl monomer using a polymerization initiator system composed of an organic compound having a functional group represented by formula (I) below ##STR1## where R.sup.1 represents a hydrogen atom, an alkyl group, or an aryl group; R.sup.2 represents an alkyl group, or an aryl group; X represents a halogen atom, an alkoxy group, or an acyloxy group, and a Lewis acid, wherein polymerization is carried out in the presence of a phosphorus-containing compound selected from the group consisting of a phosphine, a phosphine oxide, a phosphite, and a phosphate.