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    • 4. 发明授权
    • Aqueous polyurethane dispersions containing uretidione
    • 含脲基二酮的水性聚氨酯分散体
    • US5800872A
    • 1998-09-01
    • US664734
    • 1996-06-17
    • Lawrence E. KatzAugustin T. ChenJohn W. ReischRichard J. Feegel
    • Lawrence E. KatzAugustin T. ChenJohn W. ReischRichard J. Feegel
    • C08G18/08C08G18/12C08G18/72B05D3/02C08J3/00C08K3/20C08L75/00
    • C08G18/721C08G18/0819C08G18/12
    • The present invention relates to a composition being an aqueous dispersion of a polyurethane in water, said composition comprising water and the reaction product of (a) a water-dispersible isocyanate-terminated polyurethane prepolymer having an isocyanate content of between 1 and 15% by weight. The prepolymer comprises the following: an organic polyisocyanate adduct mixture having an average isocyanate functionality of between 2.0 and 4.0, and (b) an isocyanate reactive chain extender having a specified ratio of isocyanate reactive moiety to isocyanate index of the polyisocyanate adduct mixture. The polyisocyanate mixture must contain some dimer; however, other polyisocyanates, such as diisocyanates and polyisocyanate trimers, are advantageously added to the mixture. Also disclosed is a process for preparing this composition, and a method for coating a substrate with the composition.
    • 本发明涉及一种组合物,其为聚氨酯在水中的水分散体,所述组合物包含水和(a)异氰酸酯含量为1至15重量%的水分散异氰酸酯封端的聚氨酯预聚物的反应产物 。 所述预聚物包括以下:平均异氰酸酯官能度为2.0-4.0的有机多异氰酸酯加合物混合物,和(b)具有异氰酸酯反应性部分与多异氰酸酯加合物混合物的异氰酸酯指数的特定比例的异氰酸酯反应性增链剂。 多异氰酸酯混合物必须含有一些二聚体; 然而,其它多异氰酸酯如二异氰酸酯和多异氰酸酯三聚体有利地加入到混合物中。 还公开了制备该组合物的方法,以及用该组合物涂布基材的方法。
    • 8. 发明授权
    • Molecular sieve trap for nitrogen compound detection
    • 氮化合物检测用分子筛阱
    • US4301114A
    • 1981-11-17
    • US164476
    • 1980-06-30
    • David P. RounbehlerJohn W. Reisch
    • David P. RounbehlerJohn W. Reisch
    • B01D53/02G01N21/76G01N21/64G01N31/12
    • G01N21/766B01D53/02Y10T436/170769Y10T436/179228
    • A molecular sieve trap is disclosed for selective trapping of substances in a gas stream, the trap being particularly useful in systems for detecting nitrogen compounds such as N-nitrosamines or nitrogen oxides in a sample. The trap comprises a cartridge containing a packing of a granular adsorbent molecular sieve material with a carefully controlled pore size of about ten angstroms and a preference for adsorbing polar substances. The packing readily passes NO and NO.sub.2 gases in a gas stream directed through the trap while trapping and retaining larger and/or more polar molecules such as those of double-bonded carbon compounds and sulfur compounds which could otherwise interfere with subsequent measurement of the NO or NO.sub.x content of the gas stream. An N-nitroso compound detection system incorporating the molecular sieve trap is described wherein the molecular sieve trap is interposed between a pyrolyzer and a chemiluminescent NO detector to selectively trap substances in the reactor effluent. Also disclosed is a NO.sub.x detection system having a molecular sieve trap in a sample inlet line of a NO.sub.x detector.
    • 公开了一种用于在气流中选择性捕集物质的分子筛捕集器,该捕集器特别可用于检测样品中的氮化合物如N-亚硝胺或氮氧化物的系统。 该捕集器包括一个包含粒状吸附剂分子筛材料的填料的筒,其具有约十埃的小心控制的孔径,并且优选吸附极性物质。 包装容易地通过引导通过捕集器的气流中的NO和NO 2气体,同时捕获并保留较大和/或更多的极性分子,例如双键碳化合物和硫化合物的分子,否则这些分子可能会干扰随后测量NO或 气流的NOx含量。 描述了包含分子筛捕集器的N-亚硝基化合物检测系统,其中分子筛捕集器介于热解器和化学发光NO检测器之间,以选择性地捕集反应器流出物中的物质。 还公开了一种在NOx检测器的样品入口管线中具有分子筛阱的NOx检测系统。