| 摘要 |
In a process for producing rigid polyurethane foam having improved resistance to the distortion by heat and reduced thermal conductivity through the reaction of a) polyisocianates with b) compounds containing reactive hydrogen atoms with disposition with isocianates, in the presence of c) water, and if desired, d) foam agents that physically and e) catalysts and auxiliaries and/or known additives, the compounds b) containing reactive hydrogen atoms to isocianates are a mixture of polyol, comprising b1) a polyol that can be prepared by the addition of ethylene oxide and/or propylene oxide with a hexytol or a hexytol mixture with the total hexytol content of the polyol mixturebeing from 15 until 30 percent in weight, based on a polyol mixture and b2) a polyol that can be prepared through the addition of ethylene oxide and/or theylene oxide and/or propylene oxide in one or more aromatic amines with the total amine content of the polyol mixture being from 1 until 10 percent in weight based on the polyol mixture and the amount of the polyol mixture in the component b) is from 60 until 100 parts in mass by 100 parts in mass of the component b).
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