Electromagnetic wave absorbing thermoconductive silicone gel molded sheet and method for producing the same
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United States of America Patent
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Sep 4, 2001
Grant Date -
N/A
app pub date -
Mar 12, 1999
filing date -
Mar 23, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A silicone gel sheet is heat-molded from a silicone gel composition comprising metal oxide magnetic particles and a thermoconductive filler. The sheet has a high electromagnetic wave absorbing property at a frequency ranging from 500 to 800 MHz. The hardness of the composition after hardening treatment is set in the range of 10-95 when measured with an ASKER F-type hardness meter. The metal oxide magnetic particles used here can be either Mn--Zn ferrite or Ni--Zn ferrite whose average particle diameter is 1-50 .mu.m. For the thermoconductive filler, a metal oxide, aluminum nitride, boron nitride, silicon nitride, or silicon carbide can be used. In the silicone gel molded sheet, an electroconductive mesh is embedded in one surface layer of the silicone gel layers while the other surface is provided with adhesiveness. As a result, an electromagnetic wave absorbing thermoconductive silicone gel molded sheet is provided at a low cost, and the sheet is superior both in electromagnetic wave absorbing property and thermoconductivity.
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