Crosslinked polymers containing photoinitiators

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 8/00 (2006.01) C08J 3/24 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2211393

The invention relates to a novel process for the production of mouldings, in particular contact lenses, in which a crosslinkable polymer comprising units containing crosslinkable groups, units containing a bound photoinitiator and, if desired, units containing further modifiers is crosslinked in solution, and to mouldings, in particular contact lenses, obtainable by this process. The present invention likewise relates to novel crosslinkable polymers which can be employed in the process, in particular derivatives of a polyvinyl alochol having a molecular weight of at least about 2000 which comprises from about 0.5 to about 80 %, based on the number of hydroxyl groups in the polyvinyl alcohol, of units of formula (I), in which the variables are as defined in the description, and units of the formula (IV), as defined in the description, which contain a bound photoinitiator.

L'invention concerne un nouveau procédé de production de produits moulés, en particulier des lentilles de contact, qui consiste à réticuler en solution un polymère réticulable comprenant des motifs contenant des groupes réticulables, des motifs contenant un photoamorceur lié et, si besoin est, des motifs contenant d'autres modificateurs. L'invention porte également sur des produits moulés, en particulier des lentilles de contact, pouvant être obtenus par ce procédé, sur des nouveaux polymères réticulables pouvant être utilisés dans ledit procédé, en particulier des dérivés d'un alcool polyvinylique d'un poids molaire d'environ au moins 2000 qui comprend environ 0,5 à 80 % par rapport au nombre de groupes hydroxyle dans l'alcool polyvinylique, de motifs de formule (I), dans laquelle les variables sont définies dans la description, et des motifs de formule IV, conformément à la description, qui contiennent un photoamorceur lié.

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