Impregnation of plastic substrates with photochromic additives
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United States of America Patent
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Aug 4, 1998
Grant Date -
N/A
app pub date -
Jun 26, 1996
filing date -
Jun 26, 1996
priority date (Note) -
Expired
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Abstract
The present invention relates to new methods of impregnating plastic substrates with photochromic additives. By impregnating the plastic substrate in multiple impregnation steps under varying conditions, the concentration profile of two or more photochromic additive within the plastic substrate can be independently controlled. Methods are also provided for the distribution of a photochromic additive in a high boiling solvent and for increasing the glass transition temperature of a partially cured polymeric resin.
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