(Thio) (meth) acrylate monomers, intermediate compounds for the synthesis of these monomers, polymerizable compositions and polymers obtained, and their optical and ophthalmic uses
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United States of America Patent
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Oct 29, 2002
Grant Date -
Apr 25, 2002
app pub date -
Sep 20, 2001
filing date -
Feb 13, 1997
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Expired
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Abstract
Polymerizable compositions from novel monomers that correspond to the formula: ##STR1## in which: Z represents H or CH.sub.3 and X represents O or S, and Y is a 5- to 8-membered heterocycle consisting of hydrogen, carbon and sulphur atoms and at least two endocyclic sulphur atoms.
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