| 摘要 |
<p>A rigid foam is produced by reacting a polyisocyanate compound with an active hydrogen compound including one which contains a neutralized salt group or an alkoxide group in its molecule in the presence of a halogenated hydrocarbon blowing agent and auxiliaries such as a catalyst. Said active hydrogen compound is preferably a polyol, especially a polyether polyol. The method of the invention serves particularly to solve the problem of the deterioration of the physical properties of a rigid foam produced by using a hydrogen-containing halogenated hydrocarbon blowing agent, and can give a rigid foam which is equivalent to one produced by using a conventional hydrogen-free halogenated hydrocarbon blowing agent.</p> |
