Hydrogel-forming polymers

Details Hydrogel-forming polymers Hydrogel-forming polymers

B - Operations, Transporting

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18/106, 204/91.4

B29D 11/00 (2006.01) C08F 226/08 (2006.01) C08F 251/02 (2006.01) C08F 290/08 (2006.01) C08F 299/04 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1311095

ABSTRACT Hydrogel-forming Polymers Hydrogel-forming polymers for contact lenses and intraocular lenses having increased toughness despite high equilibrium water content comprise a hydrophilic monomer (eg. an N-vinyl lactam) and a polyunsaturated polymeric cross-linking agent. UV-absorbers are also disclosed which are bound in the polymer structure so as to be inextractable, some undergoing photo-Fries re-arrangement on exposure to UV-radiation so as to become UV-absorbers in the re-arranged form.

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