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    • 4. 发明公开
    • Organopolysiloxane composition for molding
    • 有机聚硅氧烷树脂
    • EP2058371A1
    • 2009-05-13
    • EP09000037.3
    • 2001-12-17
    • Shin-Etsu Chemical Co., Ltd.
    • Ikeno, MasayukiArakawa, MasayaTanaka, Kouichi
    • C08L83/04
    • C08L83/04C08G77/12C08G77/20C08G77/70C08L83/00
    • An organopolysiloxane composition for molding purposes is provided which includes: (A) an organopolysiloxane with at least two alkenyl groups bonded to silicon atoms, (B) a straight chain organopolysiloxane with a hydrogen atom bonded to a sillcon atom at both terminals, (C) an organohydrogenpolysiloxane with at least three hydrogen atoms bonded to silicon atoms within a single molecule and including a RHSiO unit and a R 2 XSiO 1/2 unit (wherein R is an unsubstituted or a substituted monovalent hydrocarbon group with no alkenyl groups, and X represents either a hydrogen atom or a group represented by R as defined above) within the molecule, (D) a hydrosilylation reaction catalyst, and (E) finely powdered silica, wherein the total number of hydrogen atoms bonded to silicon atoms within the constituent (B) and the constituent (C) ranges from 1 to 5 per alkenyl group within the constituent (A), and the number of hydrogen atoms bonded to silicon atoms within the constituent (B) accounts for 20 to 70 mol% of the combined number of hydrogen atoms bonded to silicon atoms within the constituent (B) and the constituent (C). This composition displays superior mold releasability relative to materials such as urethane resins, epoxy resins, dicyclopentadiene resins and polyester resins, and moreover also displays superior elongation at shearing and tear strength, and can be suitably used as a highly durable mold composition.
    • 提供了用于成型目的的有机聚硅氧烷组合物,其包括:(A)具有至少两个与硅原子键合的烯基的有机聚硅氧烷,(B)具有与两末端的硅原子键合的氢原子的直链有机聚硅氧烷,(C) 具有至少三个与单个分子中的硅原子键合的氢原子的有机氢聚硅氧烷,包括RHSiO单元和R 2 XSiO 1/2单元(其中R是未被取代的或没有烯基的取代的单价烃基,X表示 分子内的氢原子或由R表示的基团),(D)氢化硅烷化反应催化剂和(E)细粉状二氧化硅,其中与成分(B)内的硅原子键合的氢原子总数 ),成分(A)中的各成分(C)为1〜5,各成分(B)中与硅原子键合的氢原子的数量为 r为组分(B)和组分(C)中与硅原子键合的氢原子的总数的20〜70摩尔%。 该组合物相对于诸如聚氨酯树脂,环氧树脂,二环戊二烯树脂和聚酯树脂的材料显示出优异的脱模性,而且还显示出优异的剪切和撕裂强度伸长率,并且可以适合用作高度耐用的模具组合物。