Polyurethane hydrogel contact lens

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/79 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2410411

A prepolymer is prepared by reacting a mixture containing (a) at least one multifunctional compound, (b) at least one diisocyanate, and (c) at least one diol. The diol has a weight average molecular weight of at most 6000. The prepolymer, when reacted with an excess of water, forms a hydrogel polymer. The mixture of the prepolymer and water may be reaction molded, and used to form a contact lens.

L'invention concerne un prépolymère, obtenu par la mise en réaction d'un mélange contenant : (a) au moins un composé multifonctionnel, (b) au moins un diisocyanate, et (c) au moins un diol. Le diol présente un poids moléculaire moyen d'au moins 6000. Le prépolymère, lorsqu'il est mis à réagir avec un excédent d'eau, forme un hydrogel polymère. Le mélange du prépolymère et de l'eau peut être moulé par réaction et servir à former une lentille de contact.

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