C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 65/12 (2006.01) B01J 31/22 (2006.01) C08G 18/40 (2006.01) C08G 18/48 (2006.01) C08G 18/65 (2006.01) C08G 65/26 (2006.01) C08G 65/28 (2006.01)
Patent
CA 2301511
A resilient polyurethane foam produced by using a polyether polyol produced by reacting alkylene oxides with a polyhydroxy compound having at least 2 hydroxyl groups as an initiator in the presence of the catalyst for alkylene oxide ring-opening polymerization of the present invention, is excellent in foam physical properties, vibration characteristics and molding properties. The crushing property of a sheet cushion having a large size and a complicated shape will significantly be improved while maintaining comfortableness of the sheet cushion to sit on. Accordingly, a resilient polyurethane foam useful as a sheet cushion for vehicles, particularly for automobiles, can be provided. The present invention provides a catalyst for alkylene oxide ring-opening polymerization, which comprises a double metal cyanide complex obtained by having mono-tert-butyl ether of mono(or di or tri)ethylene glycol as an organic ligand coordinated to a reaction product obtained by reacting a metal halide with an alkali metal cyanometalate, in an aqueous medium. The present invention further provides a method for producing a resilient polyurethane foam, which comprises subjecting alkylene oxides including an alkylene oxide having a carbon number of at least 3, to ring-opening polymerization with a polyhydroxy compound having from 2 to 8 hydroxyl groups as an initiator in the presence of said catalyst for alkylene oxide ring-opening polymerization, and then reacting a polyether polyol having from 2 to 8 hydroxyl groups, a hydroxyl number of from 5 to 38 mgKOH/g and an oxyethylene group content of from 5 to 30 wt% and obtained by ring-opening polymerization of ethylene oxide in the presence of an alkali catalyst, with an isocyanate group-containing low molecular weight compound in the presence of a foaming agent.
On peut utiliser un polyol de polyéther, que l'on prépare en faisant réagir un composé polyhydroxy utilisé comme produit de départ et pourvu de deux groupes hydroxyles ou plus, avec un oxyde d'alkylène, et ce en présence d'un catalyseur de polymérisation par décyclisation d'un oxyde d'alkylène selon la présente invention, de manière à produire une mousse de polyuréthanne élastomère présentant des propriétés physiques, des caractéristiques de vibration, et une aptitude au moulage excellentes. Ce polyol de polyéther peut, à son tour, être utilisé pour produire un grand coussin de siège de forme complexe qui présente des caractéristiques de compression considérablement améliorées, mais conserve sa caractéristique de confort en cours d'utilisation. Le polyol de polyéther susmentionné, préparé conformément à la présente invention, permet donc d'obtenir une mousse de polyuréthanne élastomère pouvant être utilisée pour fabriquer un coussin de siège pour véhicule, en particulier pour une automobile.
Fukuda Hiroki
Horie Akio
Sugiyama Kayoko
Wada Hiroshi
Asahi Glass Company Ltd.
Smart & Biggar
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