Uncrosslinked (co)polyacrylonitrile hydrogels for medical...

Details Uncrosslinked (co)polyacrylonitrile hydrogels for medical... Uncrosslinked (co)polyacrylonitrile hydrogels for medical...

A - Human Necessities

61

L

400/9215

A61L 27/00 (2006.01) A61F 2/14 (2006.01) A61L 27/16 (2006.01) A61L 27/52 (2006.01) B29D 11/00 (2006.01) C08L 33/20 (2006.01)

Patent

CA 1340913

An uncrosslinked hydrogel, its process of preparation as well as its uses as an article for medical and/or surgical purposes, e.g., tubes, filaments, films, joints, implants and the like, especially in ophthalmology are provided herein. The uncrosslinked hydrogel has a relatively high water content and is prepared from a liquid starting composition which comprises 2 to 50% by weight of a copolymer of acrylonitrile and an elefinically- unsaturated comonomer bearing anionic groups, which is either salified or unsalified. The molar ratio of acrylonitrile to comonomer is between 90:10 and 100:0. The liquid starting composition includes a suitable solvent and a suitable non-solvent for the copolymer, the non-solvent being an aqueous solution of a salt. The ratio of solvent to aqueous salt solution non-solvent is between 500:1 and 0.5:1 by weight. The hydrogel has a microporous structure, an ionic capacity between 0 and 500 mEq/kg of gel, a hydric content between 50 and 90% and has an aptitude for permanent deformation under stress, even at a temperature below 40°C.

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