Layered adhesive construction with adhesive layers having...

A - Human Necessities – 61 – L

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A61L 24/08 (2006.01)

Patent

CA 2636106

A layered adhesive construction comprising a backing layer and a first and second layer of hydrocolloid adhesive, where the first and second layer of hydrocolloid adhesive have different composition, and the second layer of hydrocolloid adhesive is at least partly interposed between the first layer of hydrocolloid adhesive and the backing layer, the first and second adhesive layers consisting of a continuous phase and a discontinuous phase where the discontinuous phase of the first adhesive layer comprises a hydrocolloids providing a higher moisture absorption capacity and higher initial rate of absorption to the adhesive layer than the hydrocolloids in the discontinuous phase of the second adhesive layer, and the discontinuous phase of second layer of adhesive comprises hydrocolloids providing a higher cohesion following moisture absorption to the adhesive compared to the hydrocolloid in the discontinuous phase of the first adhesive layer.

L~invention concerne une construction adhésive stratifiée comprenant une couche inférieure et une première et une seconde couches d~adhésif hydrocolloïde, ladite première et ladite seconde couches d~adhésif hydrocolloïde ayant différentes compositions, et la seconde couche d~adhésif hydrocolloïde étant au moins en partie disposée entre la première couche d~adhésif hydrocolloïde et la couche inférieure, la première et la seconde couches adhésives consistant en une phase continue et une phase discontinue, la phase discontinue de la première couche adhésive comprenant des hydrocolloïdes présentant une capacité d~absorption de l~humidité plus élevée et une vitesse initiale d~absorption plus élevée dans la couche adhésive que les hydrocolloïdes de la phase discontinue de la seconde couche adhésive, et la phase discontinue de la seconde couche adhésive comprenant des hydrocolloïdes présentant une cohésion plus élevée après absorption de l~humidité dans l~adhésif en comparaison des hydrocolloïdes de la phase discontinue de la première couche adhésive.

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