Ultraviolet absorbing polymers comprising 2-hydroxy-5- acrylyloxyalkylphenyl-2h-benzotriazoles

Abstract From the Canadian patent

Ultraviolet light absorbing polymer compositions comprising copolymers of 2-hydroxy-5-acrylyloxyphenyl-2H-benzotriazoles of the structural formula: wherein X is H or halogen, each R1 is selected from the group consisting of H, CH3 t-alkyl of 4 to 6 carbons and, wherein R2 is C2-C10 alkylene which may be straight chain or branched, and R3 is H or CH3, provided that one R1 is H, CH3, or t-alkyl and the other R1 is with one or more other monomers copolymerizable therewith particularly acrylic monomers are useful in the manufacture of occular devices, particularly intraoccular lenses and contact lenses. The benzotriazole monomers are prepared from the corresponding intermediate phenyl alcohols …