| 摘要 |
Polyurethane foams are prepared by reacting 1) polyisocyanates with 2) compounds having a molecular weight of 400 to 10,000, containing two hydrogen atoms which are active towards isocyanates and are polymer-modified polyols and/or polyols containing predominantly primary hydroxyl groups, in the presence of 3) water and/or organic blowing agents and 4) catalysts and 5) compounds of the general formula I …<IMAGE>… in which… R<1> and R<2> are identical or different and are hydrogen and/or a C1-C4-alkyl radical,… X is an alkylene group -(CH2)n- where n = 0 to 5, preferably n = 0 or 1, -CH=CH- or a branched alkylene radical, an arylene group or (NH)m where m = 1 or 2 …<IMAGE>… where R<1> and R<2> are as defined above, or is -CN,… as flameproofing agents and if desired in the presence of 6) compounds containing at least two hydrogen atoms which are reactive towards isocyanates and have a molecular weight of from 32 to 399, and 7) surface-active assistants which are known per se. |
