发明名称 |
Viscoelastic silicone rubber compositions |
摘要 |
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. |
申请公布号 |
US9102799(B2) |
申请公布日期 |
2015.08.11 |
申请号 |
US201414336304 |
申请日期 |
2014.07.21 |
申请人 |
University of Virginia Patent Foundation |
发明人 |
Bloomfield Louis A. |
分类号 |
C08G77/56;C08G77/16;C08L83/04;C08L83/14;C08G101/00 |
主分类号 |
C08G77/56 |
代理机构 |
|
代理人 |
Sparks Rodney L. |
主权项 |
1. A viscoelastic silicone rubber composition comprising the reaction product of:
(a) a silanol-terminated polyorganosiloxane base; (b) a boron-containing crosslinking agent; and (c) a siloxane bond-forming crosslinking agent in an amount sufficient to give the viscoelastic silicone rubber composition an equilibrium shape, wherein the boron-containing cross/inking agent is present in an amount sufficient to, when subject to a strain, give the viscoelastic silicone rubber composition a stiffness that is greater on short timescales than it is on longer timescales. |
地址 |
Charlottesville VA US |