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    • 90. 发明申请
    • POLYSULFIDE AND POLYFLUOROETHER COPOLYMER COMPOSITIONS
    • 聚砜和聚氟乙烯共聚物组合物
    • WO2015085277A1
    • 2015-06-11
    • PCT/US2014/068957
    • 2014-12-06
    • HRL LABORATORIES, LLC
    • NOWAK, Andrew
    • C08G75/14C08G65/32C08G65/48C08G18/83
    • C08G18/5015C08G18/3206C08G18/5072C08G18/73C08G18/758C08G2190/00C09K3/1012C09K3/1021
    • Novel segmented polysulfide-polyfluoroether copolymers are disclosed. In particular, a polyurethane segmented copolymer composition is provided, comprising one or more polyurethane/urea hard segments, one or more polysulfide soft segments, one or more polyfluoroether soft segments, isocyanate species or derivatives thereof contained in each of the segments, and one or more curatives. The polysulfide soft segments and the polyfluoroether soft segments are together about 50 wt% to about 95 wt% of the copolymer. The weight ratio of the polysulfide soft segments to the polyfluoroether soft segments is from about 0.1 to about 10. The polyfluoroether soft segments are characterized by a glass-transition temperature of about -85°C or lower. These copolymers are useful in elastomers for improved fluid resistance, substrate adhesion, and low-temperature flexibility. These properties are desirable for sealants and other applications.
    • 公开了新的分段多硫醚 - 聚氟醚共聚物。 特别地,提供了一种聚氨酯分段共聚物组合物,其包含一个或多个聚氨酯/脲硬链段,一个或多个多硫化物软链段,一个或多个多氟醚软链段,每个链段中包含的异氰酸酯物质或其衍生物,以及一个或多个 更多的治疗药 多硫化物软链段和多氟醚软链段共聚合约50重量%至约95重量%。 多硫化物软链段与多氟醚软链段的重量比为约0.1至约10.多氟醚软链段的特征在于-85℃或更低的玻璃化转变温度。 这些共聚物可用于弹性体以改善流体阻力,底物粘附性和低温柔韧性。 这些性能对于密封剂和其它应用是理想的。