Fluid light controlling medium for a vehicle rearview mirror
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United States of America Patent
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-
Apr 17, 1990
Grant Date -
N/A
app pub date -
Jan 22, 1988
filing date -
Jun 9, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fluid composition for use in a rearview mirror of the type which contains a U.V. stable fluid light controlling medium, the composition consisting of a solvent, e.g., propylene carbonate, with a freezing point less than -30.degree. C. and a boiling point greater than 80.degree. C., a dye or mixture of dyes, e.g., a 1,2-chrome dye and a phthalocyanine dye, which is soluble in the solvent and optionally a U.V. stabilizing agent, e.g., a benzophenone, benzotriazole or organo-nickel complex, which is also soluble in the solvent. The dye or mixture of dyes has specifically defined light absorbance characteristics and in use is a fluid which is nontoxic, easy to handle, has a relatively high flash point, and is relatively inert to glass, rubbers and plastics.
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