Abstract:
PROBLEM TO BE SOLVED: To provide a method for simply obtaining a molding which can easily be demolded after molding even when it is large-sized and complex in shape when a reaction injection-molded article is obtained from a metathesis-polymerizable composition by using a molybdenum compound metathesis polymerization catalyst. SOLUTION: In a reaction injection molding method for metathesis-polymerizing a metathesis-polymerizable cyclic olefin in a mold by using the molybdenum compound polymerization catalyst, when the metathesis-polymerizable cyclic olefin is injected into the mold, a reaction mixed solution obtained by mixing a liquid B containing the metathesis-polymerizable cyclic olefin, the metathesis polymerization catalyst, and 5-20 pts.wt. of an antioxidant per 100 pts.wt. of the metathesis-polymerizable cyclic olefin and a liquid A containing the metathesis-polymerizable cyclic olefin and the metathesis polymerization catalyst and not containing an antioxidant is injected into the mold. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a foamed molding which is light in weight and high in rigidity. SOLUTION: In the method, at least two reaction solutions are supplied into a mold, polymerized, and cured in the mold. The gas concentration of the reaction solutions to be supplied into the mold is made below 0.02 wt.% at the start of the supply and changed to be 0.02-1 wt.% after the start of the supply to complete the supply. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
A method of in-mold coating, comprising the reaction injection molding step of effecting reaction of a molding material consisting of a cycloolefin, a catalyst component and a catalyst activating component in a metal mold to thereby obtain a shaped item and the coat forming step of while immobilizing the shaped item in the metal mold by shaped item fixing means, injecting a coating agent in the metal mold and curing the same to thereby form a coat on the surface of the shaped item. In the provided in-mold coating method, a uniform coat can be formed with high reproducibility on not only the front of shaped item (11) close to coating agent injection port (3) but also corner portions (22) and lateral faces (23) of shaped item (11) remote from the coating agent injection port (3), to which getting around of the coating agent is difficult. Further, in the method, the shaped item can be easily set aside from the metal mold.