Tintable coatings for glass ophthalmic lenses
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United States of America Patent
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Dec 11, 1990
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N/A
app pub date -
Jul 5, 1988
filing date -
Jul 5, 1988
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Abstract
This invention relates to coatings for application to glass lenses to provide a tint thereto. The coatings at a thickness of no more than 10 microns in conjunction with organic dyes conventionally used to tint organic plastic lenses will impart a visible transmission of less than 50%, preferably less than 30%. The coatings consist essentially of an alkyl siloxane containing a dipolar silane selected from the group consisting of an ester-functional silane, a hydroxy-functional silane, amino-functional silane, a carboxylic acid-functional silane, and a halide form of those silanes.
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