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首页> 外国专利> Process for preparing flexible polyurethane foams by the use as a polyisocyanate of an urethane-modified mixture of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates containing from 55 to 85 percent by weight of diphenylmethane diisocyanate isomers

Process for preparing flexible polyurethane foams by the use as a polyisocyanate of an urethane-modified mixture of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates containing from 55 to 85 percent by weight of diphenylmethane diisocyanate isomers

机译：通过使用氨基甲酸酯改性的二苯基甲烷二异氰酸酯和包含55-85重量％的二苯基甲烷二异氰酸酯异构体的聚苯基多亚甲基多异氰酸酯的混合物作为多异氰酸酯来制备软质聚氨酯泡沫的方法

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摘要

This invention concerns a process for the manufacture of flexible polyurethane foams from urethane-modified aromatic polyisocyanates having an NCO content of 15 to 30 percent by weight and a viscosity of 100 to 2000 centipoises at 20 DEG C., which are obtained by reaction of a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 55 to 85 percent by weight of diphenylmethane diisocyanate based on the total weight of the polyisocyanate mixture and a hydroxyl compound with 2 to 4 Zerewitinoff active hydrogen atoms and a molecular weight of 60 to 1500, in an equivalency ratio of NCO groups to active hydrogen atoms of the hydroxyl compound of 2:1 to 60:1, polyols, catalysts, blowing agents, and optionally, chain extenders, auxiliaries, and additives.
机译：本发明涉及一种由氨基甲酸酯改性的芳族多异氰酸酯生产软质聚氨酯泡沫的方法，该聚氨酯改性的芳族多异氰酸酯的NCO含量为15至30重量％，在20℃下的粘度为100至2000厘泊，是通过与二苯甲烷二异氰酸酯和聚苯撑多亚甲基多异氰酸酯的混合物，在该混合物中，基于多异氰酸酯混合物的总重量计，含有55-85％的二苯甲烷二异氰酸酯和具有2-4个Zerewitinoff活性氢原子且分子量为60-1500的羟基化合物NCO基团与羟基化合物，多元醇，催化剂，发泡剂和任选的扩链剂，助剂和添加剂的活性氢原子的当量比为2：1至60：1。

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