Moulded ophthalmic article

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/81 (2006.01) C08F 299/06 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2278566

The invention relates to moulded ophthalmic articles, especially contact lenses, which are obtainable by cross-linking a prepolymer which is the copolymerisation product of (a) at least one polyalkylene glycol of the formula (1): HO-(CH2-CH2-O)n-(CHY1-CHY2-O)m-(CHY3-CHY4-O)p-H or (1'): HO-[(CH2- CH2-CH2-CH2-O-)]q-H, (b) at least one polyhydroxy compound selected from the group consisting of (i) a linear or branched aliphatic polyhydroxy compound of the formula (2): R1-(OH-)x or a polyether polyol or polyester polyol derived therefrom, and (ii) a cycloaliphatic polyol selected from the group polyhydroxy-C5-C8-cycloalkane and unsubstituted mono- or disaccharide, (c) at least one di- or polyisocyanate of the formula (3): R2-(NCO)y, (d) at least one ethylenically unsaturated monoisocyanate of formula (4), or an ethylenically unsaturated acid halide of formula (4'), and optionally further copolymerisable monomers, wherein the variables have the significances given in the claims, in the absence or presence of an additional vinylic comonomer.

L'invention concerne des articles ophtalmiques moulés, en particulier des lentilles de contact, que l'on peut obtenir en réticulant un prépolymère qui est un produit de copolymérisation (a) d'au moins un polyakylène glycol de la formule (1): HO-(CH¿2?-CH¿2?-O)¿n?-(CHY¿1?-CHY¿2?-O)¿m?-(CHY¿3?-CHY¿4?-O)¿p?-H ou (1'): HO-[(CH¿2?-CH¿2?-CH¿2?-CH¿2?-O-)]¿q?-H, (b) d'au moins un composé polyhydroxy choisi dans le groupe constitué par (i) un composé polyhydroxy aliphatique linéaire ou ramifié de la formule (2): R¿1?-(OH)¿x? ou un polyéther polyol ou un polyester polyol dérivé de celui-ci et (ii) un polyol cycloaliphatique choisi dans le groupe des polyhydoxy-C¿5?-C¿8?-cycloalcanes et des mono- ou disaccharides non substitués, (c) d'au moins un di- ou un polyisocyanate de la formule (3): R¿2?-(NCO)¿y?, (d) d'au moins un monoisocyanate éthyléniquement insaturé de la formule (4) ou un halogénure d'acide éthyléniquement insaturé de la formule (4'), ainsi que d'autres monomère facultatifs copolymérisables. Les indices sont explicités dans les revendications. La réticulation se fait en absence ou en présence d'un comonomère vinylique additionnel.

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