Optically clear high temperature resistant silicone polymers of high refractive index
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United States of America Patent
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-
Jan 9, 2007
Grant Date -
Oct 7, 2004
app pub date -
Feb 12, 2004
filing date -
Feb 19, 2003
priority date (Note) -
Expired
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Abstract
A thermally stable polysiloxane composition is a cross-linked product of a Part A composition, of a Part B composition and a catalyst, the Part A composition being a polysiloxane having 60 to 75 percent by weight phenyl groups, the Part B composition being a polysiloxane having 50 to 80 percent by weight phenyl groups. The composition has the properties of optical clarity as measured by 90% or greater transmission of light of 400 nm wavelength in a 1.0 centimeter path, a refractive index at 589 nm of 1.545 or greater and still has 90% or greater transmission of light of 400 nm wavelength in a 1.0 centimeter path after exposure to 150.degree. C. for 6 hours. The composition is well suited for application as an optically transmissive cover or lens for light emitting diodes and for use in other optical and related devices.
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