| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rigid polyurethane foam having an excellent properties by improving dimensional stability on the foam structure at high temperature and high humidity. SOLUTION: The rigid polyurethane foam is manufactured by using a mixture of a polyether polyol A-1, which has 200-600 mgKOH/g hydroxy value, is obtained from an active hydrogen compound and an alkylene oxide and has the structure derived from the alkylene oxide based on butylene oxide by 20-100 mol.% and a polyether polyol A-2 different from the A-1, which has 200-600 mgKOH/g hydroxy value, and is obtained from an active hydrogen compound having an aromatic substituent and a nitrogen atom and an alkylene oxide. |
