| 摘要 |
980,840. Non-cellular unitary structures. ALLIED CHEMICAL CORPORATION. Aug. 1, 1963 [Oct. 31, 1962], No. 30630/63. Heading B5A. A process for the production of non-cellular unitary structures comprises reducing rigid polyurethane foam to particles and subjecting them to a pressure of at least 140 kg./sq. cm. at a temperature of from 25‹ to 260‹ C. for at least two minutes. The foam used may be a mixture of foam produced when excess isocyanate is present and foam produced when excess reactive hydrogen is present. Examples of methods illustrating the invention are given and also tables showing the physical properties of the non-cellular polyurethane foam produced by these methods. |
