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    • 1. 发明申请
    • Polysiloxane Composition And Cured Product Thereof
    • 聚硅氧烷组合物及其固化产物
    • US20130178571A1
    • 2013-07-11
    • US13819220
    • 2011-08-16
    • Takuya OgawaKazusato Shibata
    • Takuya OgawaKazusato Shibata
    • C08L83/06
    • C08L83/06C08G77/12C08G77/14C08G77/20C08K3/36C08K5/56C08K7/18C08K2003/2227C08K2201/016C08L83/00C08L83/04
    • The present invention relates to a polysiloxane composition which contains (A) at least one type of organopolysiloxane that contains at least two unsaturated aliphatic hydrocarbon groups in the molecule, (B) at least one type of organohydrogenpolysiloxane that contains at least two silicon-bonded hydrogen atoms in the molecule, (C) a hydrosilylation reaction catalyst, and (D) inorganic particles which have a major axis to minor axis ratio of 1 to 1.5 and in which the proportion of particles having a diameter of 50 μm or greater is 5 wt. % or less of the total quantity of particles, and which satisfies prescribed conditions. The polysiloxane composition of the present invention has good processability and can provide a hard cured product having an extremely low coefficient of thermal expansion after curing.
    • 本发明涉及一种聚硅氧烷组合物,其包含(A)至少一种类型的在分子中含有至少两个不饱和脂族烃基的有机聚硅氧烷,(B)至少一种含有至少两个与硅键合的氢的有机氢聚硅氧烷 分子中的原子,(C)氢化硅烷化反应催化剂和(D)长轴与短轴比为1〜1.5的无机粒子,其中直径为50μm以上的粒子的比例为5wt 。 满足规定条件的颗粒总量的%以下。 本发明的聚硅氧烷组合物具有良好的加工性,并且可以提供固化后的极低的热膨胀系数的硬化固化物。
    • 10. 发明授权
    • Method for the preparation of branched organopolysiloxane
    • 分支有机聚硅氧烷的制备方法
    • US5254658A
    • 1993-10-19
    • US963157
    • 1992-10-19
    • Takuya OgawaToshio Suzuki
    • Takuya OgawaToshio Suzuki
    • C08G77/04C08G77/06C08G77/20
    • C08G77/20C08G77/04C08G77/06
    • The present invention is a method for the preparation of branched organopolysiloxane in which polysiloxane with the formula SiO.sub.2 constitutes the branching center or branch origin and the terminal on only one side of diorganopolysiloxane is bonded to the branch origin wherein this bonding is exactly to the branch origin. Specifically, the method for preparation of branched polyorganosiloxane comprises the reaction of an alkali metal compound with a silanol-containing polysiloxane described by formula{SiO.sub.4/2 }.sub.x {R.sup.1.sub.2 (OH)SiO.sub.1/2 }.sub.y {R.sup.1.sub.3 SiO.sub.1/2 }.sub.z {RO.sub.1/2 }.sub.u,wherein each R.sup.1 is independently selected from a group consisting of C1-8 alkyls, haloalkyls, alkenyls, and aryls; R is selected from a group consisting of hydrogen atom and C1-8 alkyls; 2.ltoreq.x.ltoreq.500; 2.ltoreq.y+z+u.ltoreq.150; 2.ltoreq.y; 0.ltoreq.z; 0.3 .ltoreq.(y+z+u)/x.ltoreq.3; and 0.ltoreq.u/(x+y+z).ltoreq.0.1); by subsequent reaction with cyclic organopolysiloxane described by formula{SiR.sup.2 R.sup.3 O}.sub.m,where R.sup.2 and R.sup.3 are defined as for R.sup.1 and 3.ltoreq.m.ltoreq.8; and finally by endcapping with triorganomonohalosilane or protic acid.