Process for applying a foamed coating to a medical adhesive...

A - Human Necessities – 61 – F

Patent

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Details

A61F 13/02 (2006.01) C09J 7/04 (2006.01) D06M 23/04 (2006.01) D06N 3/00 (2006.01)

Patent

CA 2176480

This invention generally relates to a process for applying a foamed coating to a web and particularly relates to a process for applying a foamed release coating to a porous, pressure sensitive adhesive medical tape backing. The disclosed process may be used, for example, to apply a thin, uniform release coating to a porous pressure sensitive tape and includes the steps of i) forming a porous tape backing having at least one surface from polymeric fibers, ii) forming a foam of a release coating, wherein the foam is prepared by mixing water, the desired coating, and a surfactant to give a foam composition that collapses immediately when the foam composition is applied to the porous tape backing, iii) applying the foam to at least one surface of the porous tape backing to give a coated tape backing, and iv) coating the tape backing with a pressure sensitive adhesive before or after the relase coating is applied. A related process to apply a foamed latex adhesive to an elastomeric tape backing is also disclosed.

La présente invention concerne d'une façon générale un procédé d'application d'une mousse de revêtement sur un tissu et plus particulièrement un procédé d'application d'une mousse de revêtement anti-adhérence sur un support poreux de bande médicale adhésive applicable par pression. Le procédé, qui permet par exemple d'appliquer un revêtement anti-adhérence fin et uniforme sur une bande poreuse applicable par pression comprend les étapes suivantes: i) confection d'un support de bande poreux comportant au moins une surface de fibres de polymères, ii) réalisation d'une mousse de revêtement anti-adhérence, la mousse étant obtenue en mélangeant de l'eau, le revêtement désiré et un agent tensio-actif faisant que la composition de mousse s'effondre immédiatement une fois que celle-ci a été appliquée sur le support de bande poreux, iii) application de la mousse sur l'une au moins des surfaces du support de bande poreux pour obtenir un support de bande enduit, et iv) enduction du support de bande d'un adhésif applicable par pression avant ou après application du revêtement anti-adhérence. L'invention concerne également un procédé d'application d'une mousse de latex adhésive sur un support de bande élastomère.

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