PURPOSE:To obtain titled polymer having an excellent shock absorption and being suitable for wrapping fragile articles, by reacting a polymeric polyisocyanate with water in the presence of an amine catalyst and nonhydrolyzable silicon-based surfactant. CONSTITUTION:A semiflexible foam polymer of the purpose is prepared by reacting a mixture consisting of (A) 100pts.wt. polymeric polyisocyanate having an average functionality of about 2.5-3.5, e.g., polymethylenepolyphenyl isocyanate, (B) about 2-43pts.wt. water, (C) an amine catalyst, e.g., trimethylamine, tetramethylenediamine and (D) about 0.5-12pts.wt. nonhydrolyzable silicon-based surfactant, e.g., silicon/glycol copolymer and having an index (as defined by the formula) of about 10-600. The polymer thus-produced has a density as low as about 0.3-21b/ ft3 and low impact transmission.
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机译：用途：通过在胺催化剂和不可水解的硅基表面活性剂的存在下，使聚合多异氰酸酯与水反应，以获得具有极佳减震性能且适用于包裹易碎物品的标题聚合物。组成：一种目的的半柔性泡沫聚合物是通过使一种由（A）100pts.wt。平均官能度为约2.5-3.5的聚合物多异氰酸酯，例如聚亚甲基多苯基异氰酸酯，（B）约2-43pts.wt。 （C）胺催化剂，例如三甲胺，四亚甲基二胺和（D）约0.5-12pts.wt。不可水解的硅基表面活性剂，例如硅/乙二醇共聚物，其指数（由分子式定义）约为10-600。如此生产的聚合物具有低至约0.3-21b / ft 3的密度和低冲击传递。
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