| 摘要 |
PROBLEM TO BE SOLVED: To provide a rigid polyurethane foam which has more excellent heat-insulating performance and more excellent dimensional stability and combustion resistance than a rigid polyurethane foam prepared by using an HCFC as a blowing agent.SOLUTION: This invention is characterized in that in producing a rigid polyurethane foam by reacting a polyisocyanate with a polyol in the presence of a blowing agent, a catalyst, etc., the polyol uses 10-100 pts.wt. per 100 pts.wt. entire polyol, of polyether polyol prepared by using aniline as an initiator and having a hydroxyl value of 550-630 mgKOH/g. |
