Process for the production of contact lenses using plastic castings molds
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United States of America Patent
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Mar 19, 2013
Grant Date -
Mar 10, 2011
app pub date -
Oct 15, 2010
filing date -
Aug 31, 1999
priority date (Note) -
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Abstract
The invention is concerned with the problem that with known plastic casting molds, especially those of polypropylene, the lenses produced with these molds have a slippery surface. The invention solves this problem through the use of polymers which are notable for their very low oxygen permeability.
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