公开(公告)号：US5908878A

公开(公告)日：1999-06-01

申请号：US934654

申请日：1997-09-22

申请人： Judith Diane Fairclough Baity ,  Chana Wilson Evans ,  Alan La Verne Himstedt

发明人： Judith Diane Fairclough Baity ,  Chana Wilson Evans ,  Alan La Verne Himstedt

IPC分类号： C08K3/36 ,  C08G77/20 ,  C08L83/04 ,  C08L83/05 ,  C08L83/07

CPC分类号： C08L83/04 ,  C08G77/12 ,  C08G77/20 ,  C08G77/70

摘要： The present invention is a heat curable polyorganosiloxane composition comprising (A) a first polydiorganosiloxane having two diorganoalkenylsiloxy terminal groups per molecule and a total concentration of unsaturated hydrocarbon radicals of 0.118 to 0.156 mole percent; (B) a second polydiorganosiloxane having two diorganoalkenysiloxy terminal groups per molecule, and no detectable concentration of pendant unsaturated hydrocarbon radicals; (C) a third polydiorganosiloxane having two diorganoalkenysiloxy terminal groups per molecule and a total concentration of unsaturated hydrocarbon radicals of 1.37 to 2.24 mole percent; wherein the weight ratio of polydiorganoiloxanes (A), (B), and (C) satisfy the relationship (C)/(A+B)=0.0379 to 0.1071 and A/B=1.460 to 2.115; (D) a crosslinker containing silicone-hydrogen bonds, wherein the ratio of silicone-hydrogen bonds to the total ethylenically unsaturated hydrocarbon radicals present on the polydiorganosilanes (A), (B), and (C) is from 1.00 to 2.25; (E) from 5 to 50 weight percent of a silica filler; and (F) a catalytically effective amount of a platinum catalyst. Optionally, the composition may include an inhibitor.

摘要翻译： 本发明是一种热固性聚有机硅氧烷组合物，其包含（A）每分子具有两个二有机链烯基甲硅烷氧基端基的第一聚二有机硅氧烷和不饱和烃基的总浓度为0.118至0.156摩尔％ （B）每分子具有两个二有机链烯氧基端基的第二聚二有机硅氧烷，并且没有可检测浓度的侧基不饱和烃基; （C）每分子具有两个二有机链烯氧基端基的第三聚二有机硅氧烷，不饱和烃基的总浓度为1.37至2.24摩尔％; 其中聚二有机基硅氧烷（A），（B）和（C）的重量比满足关系式（C）/（A + B）= 0.0379〜0.1071，A / B = 1.460〜2.115; （D）包含硅氧烷 - 氢键的交联剂，其中聚硅氧烷 - 氢键与存在于聚二有机硅烷（A），（B）和（C）上的总烯属不饱和烃基的比例为1.00-2.25; （E）5至50重量％的二氧化硅填料; 和（F）催化有效量的铂催化剂。 任选地，组合物可以包括抑制剂。