Light polarizing film with melanin
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United States of America Patent
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Jul 13, 2004
Grant Date -
Apr 3, 2003
app pub date -
Jul 29, 2002
filing date -
Jul 27, 2001
priority date (Note) -
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Abstract
A dichroic dye can be blended with a non-dichroic dye (melanin and melanin derivatives) and still maintain a commercially acceptable level of polarizing efficiency. Efficient polarizers exhibit polarizing efficiencies of greater or equal to 95% and the best are even greater than or equal to 98%. Since melanin has unique features with respect to absorption of wavelengths of light, melanin is very useful to have in combination with a polarizer that takes advantage of this absorption. The blending can be done by a mixture (preferably an aqueous mixture) of melanin and a dichroic dye in a ratio sufficient to achieve the desired color and polarizing effect.
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