Polymerized hydrogel adhesives

A - Human Necessities – 61 – L

Patent

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Details

A61L 24/04 (2006.01) A61L 24/06 (2006.01)

Patent

CA 2437757

The present invention relates to polymerized hydrogel adhesives, in particular those wherein the hydrogel is formed from monomers which include acrylamido-2- methane propanesulfonic acid or salts thereof (AMPS monomers) and those which contain glycerol as a humectant. In such adhesives, the levels of unpolymerized residual monomers, such as unpolymerized AMPS, acrylonitrile, acrylamide and t-butyl acrylamide; and the levels of other impurities such as acrolein, are kept very low. The present invention also relates to a process for making hydogel adhesives with very low levels of such unwanted materials. Such a process involves preparation of reaction mixtures under selected pH and/or temperature conditions and polymerization of AMPS monomers using selected conditions of pH and UV curing.

La présente invention concerne des adhésifs hydrogel polymérisés en particulier ceux dans lesquels l'hydrogel est formé à partir de monomères comprenant de l'acide propanesulfonique acrylamido-2-méthane ou des sels de celui-ci (monomères AMPS) et ceux contenant du glycérol comme humectant. Dans de tels adhésifs, les niveaux des monomères résiduels non polymérisés, par exemple les AMPS, l'acrylonitrile, l'acrylamide et l'acrylamide de t-butyle non polymérisés, et les niveaux d'autres impuretés telles que l'acroléine restent très bas. La présente invention concerne également un procédé de fabrication d'adhésifs hydogel avec de très faibles niveaux de ces matières non désirées. Ledit procédé consiste à préparer des mélanges de réaction dans des conditions sélectionnées de pH et/ou de température et à polymériser les monomères AMPS dans des conditions sélectionnées de pH et de durcissement par UV.

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