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    • 9. 发明授权
    • Production of rigid polyurethane foams
    • 生产刚性聚氨酯泡沫
    • US5552450A
    • 1996-09-03
    • US229255
    • 1994-04-18
    • Werner HinzRolf HennUwe KeppelerBernd Guettes
    • Werner HinzRolf HennUwe KeppelerBernd Guettes
    • C08G18/48C08G18/66C08G65/26C08G65/28C08G65/333C08G18/00
    • C08G18/4845C08G18/4812C08G18/6666C08G65/26C08G65/33348C08G2101/0025C08G2101/0041
    • A process for the production of rigid polyurethane foams involves reactinga) organic and/or modified organic polyisocyanates withb) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired,c) low-molecular-weight chain extenders and/or cross-linking agents,in the presence ofd) blowing agents,e) catalysts and, if desired,f) assistants and/or additives,where the relatively high-molecular-weight compounds (b) containing at least two reactive hydrogen atoms are polyoxypropylene-polyols and/or polyoxyethylene-polyoxy-propylene-polyols containing up to 20% by weight, based on the weight of the alkylene oxide units, of pendant oxyethylene units containing secondary hydroxyl groups and having a functionality of from 3.8 to 4.1, a hydroxyl number of from 385 to 410 mg of KOH/g and a viscosity of from 1700 to 2400 mPa.multidot.s at 25.degree. C., and which can be prepared by anionic polymerization of 1,2-propylene oxide and, if desired, ethylene oxide on an initiator molecule mixture comprising sucrose, pentaerythritol and diethylene glycol.
    • 用于生产刚性聚氨酯泡沫的方法包括使a)有机和/或改性的有机多异氰酸酯与b)至少一种含有至少两个反应性氢原子的相对高分子量化合物反应,如果需要,c) 分子量增链剂和/或交联剂,在d)发泡剂的存在下,e)催化剂,如果需要,f)助剂和/或添加剂,其中相对高分子量的化合物(b) 含有至少两个反应性氢原子的是聚氧丙烯 - 多元醇和/或聚氧乙烯 - 聚氧丙烯 - 多元醇,其含有基于烯化氧单元重量的至多20重量%的含有仲羟基的侧面氧乙烯单元并具有 官能度为3.8至4.1,羟基数为385至410mg KOH / g,25℃时粘度为1700至2400 mPax,可通过1,2-环氧丙烷的阴离子聚合制备 如果需要, 包含蔗糖,季戊四醇和二甘醇的引发剂分子混合物上的氧化亚苯基。