| 摘要 |
To provide a process for constantly producing a flexible polyurethane foam, which has excellent durability, weather resistance and flame retardancy without using a flame retardant, and which undergoes little change in hardness against a temperature change and has excellent air flow, small shrinkage of the foam and no irregular cell structure. A process for producing a flexible polyurethane foam, which comprises reacting a polyol mixture with a polyisocyanate compound in the presence of a urethane-forming catalyst and a blowing agent, characterized in that the polyol mixture comprises the following polyol (A) and the following polyol (B), and the proportion of the polyisocyanate compound to the polyol mixture is at least 90 by isocyanate index, and the total amount of Zn and Co contained in the polyol mixture is from 0.1 to 200 ppm, wherein:
Polyol (A): a polyether polyol having an average of from 2 to 3 hydroxyl groups and a hydroxyl value of from 10 to 90 mgKOH/g, obtained by ring-opening addition polymerization of an alkylene oxide to an initiator using a double metal cyanide complex catalyst containing Zn and Co;
Polyol (B): a polyether polyol having an average of from 2 to 3 hydroxyl groups and a hydroxyl value of from 15 to 250 mgKOH/g, which is a polyether polyol other than the polyether polyol obtained by ring-opening addition polymerization of an alkylene oxide to an initiator by using a double metal cyanide complex catalyst. |
