| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a polyester polyurethane foam having low density and excellent mechanical properties such as tensile strength and elongation. <P>SOLUTION: The polyester polyurethane foam is produced by reacting a raw material for a polyurethane foam containing polyols, polyisocyanates, foaming agents and catalysts to effect the foaming and hardening of the product. The polyol to be used in the method contains a polyester polyol having a functional group number of the hydroxyl group of 2-3, and a number-average molecular weight of 500-1,300, preferably 500-800. Water is used as the foaming agent in an amount of 1.5-3 pts.mass based on 100 pts.mass of the polyol, and the polyisocyanate is a tolylene diisocyanate containing 65-75 mass% 2,4-tolylene diisocyanate. The isocyanate index is set to 85-130. The apparent density of the foam is 35-65 kg/m<SP>3</SP>, the tensile strength is 140-400 kPa and the elongation is 100-250%. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
