Polyurethane hydrogel contact lens

Details Polyurethane hydrogel contact lens Polyurethane hydrogel contact lens

2005-08-16

2005-08-16

Sergent, Rabon (Department: 1711)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C252S182220, C528S067000, C528S073000, C528S076000, C528S085000, C544S222000, C560S026000, C560S115000, C560S158000

Reexamination Certificate

active

06930196

ABSTRACT:
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.

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