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Process for preparing molded polyurethane foam with very low soft density derived from fully blown prepolymer with water and molded polyurethane foam derived from fully blown isocyanate-finished prepolymer
Process for preparing molded polyurethane foam with very low soft density derived from fully blown prepolymer with water and molded polyurethane foam derived from fully blown isocyanate-finished prepolymer
Very soft, very low density, all water-blown polyurethane foams are prepared by reacting an isocyanate-terminated prepolymer with from 30% to 150% stoichiometric excess of water. The foams have molded densities less than or equal to 1.5 lb/ft3 and softness, as measured by 25% ILD of less than or equal to 15 lbs., yet retain excellent resiliency, tear strength and elongation. The foams are suitable for use in cushioning applications such as those traditionally employing polyester fiberfill.
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机译:通过使异氰酸酯封端的预聚物与化学计量过量的30%至150%的水反应,可以制得非常柔软,非常低密度的所有水发泡聚氨酯泡沫。泡沫具有小于或等于1.5lb / ft 3的模制密度和柔软度,如通过25%ILD测得的小于或等于15lbs。,但仍保持优异的回弹性,撕裂强度和伸长率。该泡沫适用于缓冲应用,例如传统上采用聚酯纤维填充物的那些。
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