申请人:Mitsui Chemicals, Inc.
公开号:EP1028133A1
公开(公告)日:2000-08-16
A flexible polyurethane cold cure molded foam of high-durability has an overall density of 35 kg/m3 to 45 kg/m3 and a wet heat compression set of not more than 15%, and preferably has a hardness change ratio, as determined in a repeated compression test, of not more than 15%. The process for producing the flexible polyurethane cold cure molded foam obtained from a polyol and/or a polymer polyol containing dispersed polymer microparticles involves radical polymerizing a compound having an unsaturated bond in the polyol, water, a catalyst and a polyisocyanate, the polyol preferably being a polyol synthesized by the use of a catalyst containing at least one compound selected from the group consisting of a compound having a nitrogen-phosphorus double bond, cesium hydroxide and rubidium hydroxide. The foam according to the invention has a low density and has excellent durability, particularly as evaluated by hardness change ratio in a repeated compression test and by wet heat compression set.
高耐久性软质聚氨酯冷固化模塑泡沫塑料的总密度为 35 kg/m3 至 45 kg/m3,湿热压缩永久变形率不超过 15%,重复压缩试验确定的硬度变化率最好不超过 15%。生产由多元醇和/或含有分散聚合物微粒的聚合物多元醇制得的软质聚氨酯冷固化模塑泡沫塑料的工艺包括将多元醇中具有不饱和键的化合物、水、催化剂和多异氰酸酯进行自由基聚合,多元醇最好是使用催化剂合成的多元醇,催化剂中至少含有一种选自具有氮磷双键的化合物、氢氧化铯和氢氧化铷组成的组的化合物。根据本发明生产的泡沫密度低,耐久性好,特别是通过重复压缩试验中的硬度变化率和湿热压缩永久变形进行评估。