Transparent cellulose hydrogel and production process thereof

Details Transparent cellulose hydrogel and production process thereof Transparent cellulose hydrogel and production process thereof

1998-04-15

1999-10-05

Nutter, Nathan M.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Implant or insert

424426, 424427, 424428, 1061626, 10616301, 10616601, 10616701, 523105, 523106, 2105001, 21050021, 21050027, 21050029, 351159, 351160R, 351160H, B01J 1300, A61F 214

Patent

active

059620056

ABSTRACT:
A transparent cellulose hydrogel having a transmittance of visible light of not less than 70%/mm and a tensile strength of not less than 10 kg/cm.sup.2, wherein the hydroxyl groups of cellulose constituting said hydrogel are not chemically crosslinked; and a process for producing a transparent cellulose hydrogel, comprising coagulation and regeneration of cellulose from a cellulose solution using an aqueous solution containing an organic solvent in a proportion of 20-95 wt %. The cellulose hydrogel of the present invention is useful as a raw material of an ophthalmic material, such as soft contact lens, artificial crystal lens, artificial cornea, artificial vitreous body and the like, a carrier of fragrance, and a base of gel and cream, and the like. In addition, the transparent cellulose hydrogel of the present invention has a densely packed and uniform structure, so that it can provide a material of a separation membrane having a small molecular cutoff and high pressure resistance.

REFERENCES:
patent: 4129640 (1978-12-01), Rodier
patent: 4173613 (1979-11-01), Rodier
patent: 4323627 (1982-04-01), Joh
patent: 5336231 (1994-08-01), Adair

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