Coating processes – Optical element produced
Patent
1996-06-26
1998-08-04
Bell, Janyce
Coating processes
Optical element produced
427164, 427384, 427379, 427402, 4274121, B05D 506
Patent
active
057890153
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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Blum Ronald D.
Gupta Amitava
Iyer Venkatramani S.
Bell Janyce
InnoTech, Inc.
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