Impregnation of plastic substrates with photochromic additives

Details Impregnation of plastic substrates with photochromic additives Impregnation of plastic substrates with photochromic additives

1997-11-14

1998-12-22

Bell, Janyce

Coating processes

Optical element produced

252586, 427384, 4274301, 427565, B05D 506

Patent

active

058515852

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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