| 摘要 |
Polyetherpolyols corresponding to the general formula: <IMAGE> (I) <IMAGE> in which: Y denotes oxyalkylene radicals derived from alkene oxides, m denotes a number such that 1</=m</=2 and n1 and n2 denote numbers such that 2</=(n1+n2)</=5. The brominated polyetherpolyols are prepared by the condensation of (m+1) moles of 2-butyne-1,4-diol with m moles of epichlorohydrin in the presence of m moles of a strong base, followed by the addition of (n1+n2) moles of alkene oxide and, finally, by a partial bromination. These brominated polyetherpolyols may be employed, by themselves, or mixed with conventional unhalogenated polyetherpolyols, in the manufacture of rigid polyurethane foams. |
