Polyurethane base lens resin, plastic lens comprising the resin and preparation method of the lens
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United States of America Patent
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May 29, 1990
Grant Date -
N/A
app pub date -
Feb 3, 1989
filing date -
Feb 16, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Polyurethane base lens resins obtained by reacting one or more of sulfur-containing polyisocyanates compound with one or more of sulfur-containing polyols, and polyurethane base lenses comprising these resins are disclosed. A method for preparing polyurethane base lenses which comprises adding internal mold releasing agents to the mixture of the above polyisocyanates and polyols prior to casting polymerization is also disclosed.
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Cited Art Landscape
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