Process for making pressure sensitive adhesive hydrogels

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 151/08 (2006.01) A61L 15/58 (2006.01) C08F 290/06 (2006.01) C08F 290/14 (2006.01)

Patent

CA 2588700

A process is provided for preparing a pressure sensitive adhesive hydrogel, comprising: (A) providing an oligomeric precursor, the oligomeric precursor comprising a polyether moiety endcapped with ethylenic unsaturation, the oligomeric precursor being associated with methacrylic acid; (B) providing an ethylenically unsaturated crosslinking agent selected from the group consisting of difunctional ethylenically unsaturated monomer, trifunctional ethylenically unsaturated monomer and combinations of the foregoing; (C) free radically curing the oligomeric precursor and the ethylenically unsaturated crosslinking agent in water at a pH between about 3.5 and about 9 to provide the pressure sensitive adhesive hydrogel.

La présente invention a trait à un procédé pour la préparation d'un hydrogel adhésif autocollant, comprenant: (A) la mise à disposition d'un précurseur oligomérique, le précurseur oligomérique comportant un groupe fonctionnel polyéther coiffé aux extrémités par une insaturation éthylénique, le précurseur oligomérique étant associé à un acide méthacrylique; (B) la mise à disposition d'un agent de réticulation à insaturation éthylénique choisi parmi le groupe constitué de monomère à insaturation éthylénique bifonctionnel, de monomère à insaturation éthylénique trifonctionnel et des combinaisons de ceux-ci; (C) la polymérisation radicalaire du précurseur oligomérique et de l'agent de réticulation à insaturation éthylénique dans l'eau à un pH entre environ 3,5 et environ 9 pour obtenir un hydrogel adhésif autocollant.

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