Process for coating a performed substrate

Details Process for coating a performed substrate Process for coating a performed substrate

D - Textiles, Paper

06

N

D06N 3/00 (2006.01) A61F 13/00 (2006.01) A61L 15/00 (2006.01) D06N 7/00 (2006.01)

Patent

CA 2367657

A process for coating a perforated substrate with a gel (e.g. a polymerised acrylate hydrogel or a xerogel) without substantial occlusion of the perforations comprises (i) forming a layer of a liquid pregel mixture, comprising one or more monomers, on a web coated with a silicone, polyethylene, Teflon (R) or other coating having a surface energy less than the surface energy of the liquid pregel mixture; (ii) contacting the perforated substrate with the liquid pregel mixture; and (iii) curing the liquid pregel mixture. Preferably at least part of the curing takes place while the liquid pregel mixture is in contact with both the perforated substrate and the web. The process is especially applicable to the manufacture of attachment tabs for wigs and toupees, wound dressings, patches for transdermal drug delivery, therapeutic patches or biomedical skin electrodes.

Un procédé de revêtement d'un substrat perforé avec un gel (par ex. un hydrogel d'acrylate polymérisé ou un xerogel) sans occlusion compléte des perforations consiste à (i) former une couche d'un mélange de prégel liquide, comprenant au moins un monomère, sur une bande recouverte de silicium, polyéthylène, Teflon (R) ou autre revêtement à énergie superficielle inférieure à celle du mélange de prégel liquide, (ii) mettre en contact le substrat perforé avec le mélange de prégel liquide, et (iii) traiter ledit mélange. De préférence, seulement une partie du traitement a lieu, lorsque le mélange de prégel liquide est en contact avec le substrat perforé et la bande. Ce procédé est notamment destiné à la fabrication d'attaches pour perruques et postiches, pansements, timbres pour l'administration de médicament transdermique, timbres thérapeutiques ou électrodes cutanées biomédicales.

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