Tungsten hexacarbonyl in plastic lenses
AssigneePPG Industries, Inc.
InventorsI. Roger Leatherman, Michael S. Misura
Life of this patent
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Abstract
Tungsten hexacarbonyl acts as a photochromic agent and an infrared absorber when incorporated in liquid allyl glycol carbonates, such as allyl diglycol carbonate, and polymerizates thereof. Photochromic, infrared-absorbing optical and ophthalmic lenses containing tungsten derived from tungsten hexacarbonyl are made.
Claims15
A liquid composition comprising a mixture of allyl glycol carbonate monomer and sufficient tungsten hexacarbonyl to provide a photochromic polymerizate that become blue and has substantial infrared absorbance upon exposure to ultraviolet radiation.
A solid poly(ally glycol carbonate) photochromic polymerizate article having tungsten hexacarbonyl uniformly incorporated therein, said article becoming blue and having substantial infrared absorbance upon exposure to ultraviolet radiation.
A solid poly(allyl glycol carbonate) article having a photochromic quantity of tungsten hexacarbonyl incorporated in its surface, said article turning blue and having substantial infrared absorbance upon exposure to ultraviolet radiation.
A method of making a photochromic article which comprises:
- adding a photochromic amount of tungsten hexacarbonyl to a liquid allyl glycerol carbonate monomer to form a mixture, and
- polymerizing the mixture to form a solid photochromic polymerizate article which turns blue and has substantial infrared absorbance upon exposure to ultraviolet radiation.
A method of making a photochromic article which turns blue and has substantial infrared absorbance upon exposure to ultraviolet radiation, which method comprises soaking a poly(allyl glycol carbonate) article in a heated solution of tungsten hexacarbonyl in an organic solvent whereby to deposit a photochromic amount of tungsten hexacarbonyl in said article and removing the solvent from the article.
A method of making a photochromic article which comprises:
- adding from about 0.1 to about 0.5 weight percent tungsten hexacarbonyl to a liquid allyl glycerol carbonate monomer, basis weight of the monomer, to form a mixture, and
- polymerizing the mixture to form a solid article.
Dependencies are inferred from the claim text.