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1. 发明申请

US20070179248A1 High elongation FKM formulations with improved molding properties 审中-公开
标题翻译：具有改进成型性能的高伸长率FKM配方
公开(公告)号：US20070179248A1
公开(公告)日：2007-08-02
申请号：US11346134
申请日：2006-02-02
申请人： James Balzer , Roger Faulkner
发明人： James Balzer , Roger Faulkner
IPC分类号： C08L27/12
CPC分类号： C08L27/18 , C08L2205/02 , C08L2666/04
摘要： It has been found that certain peroxide/coagent crosslinked blends of a peroxide-crosslinkable FKM fluoroelastomer with a similar non-peroxide crosslinkable FKM fluoroelastomer exhibit increased elongation to rupture, improved demoldability, and slightly reduced durometer compared to prior art peroxide-cured FKMs. The degree to which these desirable changes are realized is greatest when the monomer ratios of the peroxide-crosslinkable FKM fluoroelastomer are similar to the monomer ratios of the non-peroxide crosslinkable FKM. The improved demoldability of these compositions is believed to be due to improved hot tear strength and especially increased elongation at molding temperature; these properties are important in the process of removing complex parts from a mold after forming, whether by compression, transfer, or injection molding. Hot tear strength and elongation are especially important in removal of FKM molded parts with “undercuts” in the mold. In particular, these blends exhibit better demoldability than similar purely peroxide-crosslinked FKM compounds, without being sticky. These compositions are also useful without post cure (as are standard peroxide-cured FKMs, especially those with iodine cure sites).
摘要翻译：已经发现，与现有技术的过氧化物固化的FKM相比，过氧化物交联的FKM含氟弹性体与类似的非过氧化物可交联的FKM含氟弹性体的某些过氧化物/助剂交联的共混物表现出增加的断裂伸长率，改进的脱模性和略微降低的硬度。当过氧化物可交联的FKM含氟弹性体的单体比与非过氧化物可交联FKM的单体比相似时，实现这些期望变化的程度最大。这些组合物的改进的脱模性被认为是由于改进的热撕裂强度和特别是在成型温度下增加的伸长率; 这些性能在成型后通过压缩，转移或注塑成型除去模具中的复杂部件的过程是重要的。热撕裂强度和伸长率在模具中用“底切”去除FKM模制件时特别重要。特别地，这些共混物表现出比类似的纯过氧化物交联的FKM化合物更好的脱模性，而不粘。这些组合物在没有后固化的情况下也是有用的（如标准的过氧化物固化的FKM，特别是具有碘固化位点的那些）。

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