| 摘要 |
PROBLEM TO BE SOLVED: To provide a flexible polyurethane foam which has a highly fine cell structure and excellent flame retardancy. SOLUTION: This flexible polyurethane foam having the highly fine cell structure and produced by mixing, foaming and curing an isocyanate-terminal prepolymer, a flame retardant, a cross-linking agent, a foam stabilizer, and a foaming component is characterized in that the isocyanate-terminal prepolymer is prepared by reacting a polyisocyanate with a polyol component comprising one or more tri- or more functional low mol. wt. polyols having number-average mol. wts. of 400 to 1,000 and one or more tri- or more functional high mol. wt. polyols having number-average mol. wts. of 3,000 to 12,000. The polyurethane foam utilizes a difference between the reactivity of the isocyanate-terminal prepolymer originating from the low mol. wt. polyols and the reactivity of the isocyanate-terminal prepolymer originating from the high mol. wt. polyols, and thereby interferes the physical associations of the cells to form the fine cell structure. The flame retardant is added to give excellent flame retardancy. COPYRIGHT: (C)2005,JPO&NCIPI |
