Abstract: A polymerizable composition comprising a norbornene monomer, a metathesis polymerization catalyst, and a nonpolar radical generating agent, from which a crosslinkable resin can be obtained that is suitable as an electric material and the like used in an electric circuit board. By coating or impregnating this polymerizable composition onto or into a support, and then carrying out bulk polymerization to obtain a crosslinkable resin composite, and then crosslinking the crosslinkable resin composite to obtain a crosslinked resin composite having excellent characteristics such as electric insulation, adhesion, mechanical strength, heat resistance, dielectric properties and the like. The compound has a dipole moment of 0.5 or less, generates radicals by heating, and can initiate a crosslinking reaction.

Abstract: A crosslinkable and polymerizable composition containing a monomer and a cross-linking agent is applied onto a metal foil to form a coated film of the composition, and heat is applied to the coated film to firstly bulk polymerize the entire coated film of the crosslinkable and polymerizable composition. Then, by applying heat to the coated film from the metal foil side, cooling a surface far from the metal foil as needed, and subjecting a limited region adjacent to the metal foil in the thickness direction of the coated film to a cross-linking reaction, a composite for multilayer circuit board is obtained, in which the metal foil layer, a hard resin layer containing a hard resin obtained by bulk polymerization reaction and cross-linking reaction, and an adhesive resin layer containing an adhesive resin obtained by bulk polymerization reaction are laminated in this order.

Abstract: A process for producing a crosslinkable resin formed product is disclosed which comprises providing a polymerizable composition containing a cycloolefin monomer, a metathesis polymerization catalyst, a chain transfer agent, and a crosslinking agent, and heating the polymerizable composition to 50° C. or more to effect ring-opening metathesis bulk polymerization, the temperature of the polymerizable composition before heating being maintained at ?10° C. to +20° C. According to the present invention, a process for efficiently producing a crosslinkable resin formed product which exhibits excellent flowability when melted by heat and does not produce voids(blurs) inside a laminate or impair flatness when laminated on a substrate is provided.

Abstract: A crosslinkable resin formed product comprising a cycloolefin resin obtained by ring-opening metathesis bulk polymerization of a cycloolefin monomer and a crosslinking agent, the cycloolefin resin having a weight average molecular weight (Mw) of 10,000 to 50,000 and a molecular weight distribution (Mw/Mn) of 4.4 or less, a crosslinked resin formed product produced by crosslinking the crosslinkable resin formed product, and a crosslinked resin-metal clad laminate produced by laminating the crosslinked resin formed product on a metal foil are disclosed. According to the present invention, a crosslinkable resin formed product which exhibits excellent flowability when melted by heat, and does not produce voids inside the laminate or impair flatness when laminated with a substrate, a crosslinked resin formed product produced by crosslinking the crosslinkable resin formed product, and a crosslinked resin-metal clad laminate produced by laminating the crosslinked resin formed product on a metal foil are provided.