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manufacture of urethane foam and isocyanurat - in the presence of low boiling foaming
manufacture of urethane foam and isocyanurat - in the presence of low boiling foaming
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机译:低沸点泡沫存在下聚氨酯泡沫和异氰酸酯的生产
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摘要
This invention relates to a process for preparing a rigid, closed-celled polyisocyanate-based foam in the presence of water and a blowing agent. The blowing agent comprises one or more organic compounds, particularly halocarbons, having a boiling point of from 222K to 272K at atmospheric pressure, and is substantially free of organic compounds having a boiling point of 273K or greater. Preferred halocarbons are chlorofluoroethanes, especially chlorodifluoroethane (R-142b) and fluoroethanes.
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