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.
在本发明的
环氧乙烷开环聚合催化剂存在下,使用由氧化亚烷与具有至少 2 个羟基的多羟基化合物反应生成的聚醚多元醇作为
引发剂生产的弹性聚
氨酯泡沫塑料,在泡沫塑料物理性能、振动特性和成型性能方面都非常出色。在保持片状坐垫舒适性的同时,还能显著改善具有较大尺寸和复杂形状的片状坐垫的挤压性能。因此,本发明提供了一种可用作车辆,特别是汽车坐垫的弹性聚
氨酯泡沫塑料。
本发明提供了一种用于环氧烷开环聚合的催化剂,它包括一种双
金属
氰化物配合物,该配合物是由单(或二或三)
乙二醇的单叔
丁基醚作为有机配位体与
金属卤化物与碱
金属
氰基
金属酸盐在
水介质中反应得到的反应产物配位而得到的。
本发明进一步提供了一种生产弹性聚
氨酯泡沫的方法,该方法包括在所述环氧亚 烷开环聚合催化剂存在下,使包括碳数至少为 3 的环氧亚烷在内的氧化亚烷与具有 2 至 8 个羟基的多羟基化合物作为
引发剂进行开环聚合、然后将具有 2 至 8 个羟基、羟基数为 5 至 38 mgKOH/g 和氧
乙烯基含量为 5 至 30 wt%、在碱催化剂存在下通过
环氧乙烷开环聚合反应得到的聚醚多元醇与含
异氰酸酯基的低分子量化合物在发泡剂存在下进行反应。