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    • 26. 发明公开
    • VISCOELASTIC SILICONE RUBBER COMPOSITIONS
    • 粘弹性硅橡胶组合物
    • EP2545103A1
    • 2013-01-16
    • EP11753997.3
    • 2011-03-09
    • University Of Virginia Patent Foundation
    • BLOOMFIELD, Louis, A.
    • C08G77/08B32B25/00B32B9/04
    • C08G77/56C08G77/16C08G2101/0016C08K3/38C08K5/5415C08K5/5419C08K5/55C08K2003/387C08K2201/002C08L83/00C08L83/04C08L83/14
    • This invention relates to viscoelastic silicone rubber compositions that are the products of the reaction of: (a) a silanol-terminated polyorganosiloxane base; (b) a boron-containing crosslinking agent; and (c) a siloxane bond-forming crosslinking agent. In a viscoelastic silicone rubber composition of the invention some of the crosslinks, the siloxane crosslinks, are permanent and others of the crosslinks, the boron-containing crosslinks, are temporary. Because a fraction of its crosslinks can come apart and then reform, a viscoelastic silicone rubber composition of the invention can relax stress in response to strain and thus adapt to new shapes. The composition has sufficient permanent crosslinks, however, to establish a permanent equilibrium shape to which the composition will eventually return when not subject to any imposed stress. A viscoelastic silicone rubber composition has sufficient temporary crosslinks to give the composition a stiffness that is greater on short timescales than it is on longer timescales.
    • 粘弹性硅橡胶组合物是以下物质的反应产物:(a)硅烷醇封端的聚有机硅氧烷基料; (b)含硼交联剂; 和(c)硅氧烷键形成交联剂。 在本发明的粘弹性硅橡胶组合物中,一些交联即硅氧烷交联是永久性的,另一交联即含硼交联是暂时的。 因为其一部分交联可以分开然后重新形成,本发明的粘弹性硅橡胶组合物可以响应应变而放松应力,并因此适应新的形状。 然而,该组合物具有足够的永久交联,以建立当不受任何施加的应力时组合物最终返回的永久平衡形状。 粘弹性硅橡胶组合物具有足够的暂时交联以赋予组合物在较短时间尺度上比在较长时间尺度上更大的硬度。