Process for solvent delivery of chemical compounds to...

B - Operations – Transporting – 05 – D

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B05D 3/06 (2006.01) B05D 3/10 (2006.01) D21F 1/00 (2006.01) D21F 1/30 (2006.01)

Patent

CA 2076538

A process for improving the life of papermaking belts containing a cured photosensitive polymeric resin is disclosed. The process includes the use of a resin-swelling solvent (e.g., isopropyl alcohol) to deliver an effective amount of chemical compounds capable of slowing down the degradation rate of the photosensitive polymeric resin in the papermaking belt. The solvent delivery technique makes it possible to deliver useful quantities of chemical compounds to the resin containing papermaking belts that would not normally be possible to add because of their low direct solubility in the polymeric resin and/or process incompatibility. Preferably, the chemical compounds are antioxidants (e.g., hindered phenols) which inhibit or retard oxidation of the cured resin and its ensuing degradative effects.

Procédé permettant de prolonger la durée de vie de bandes de fabrication de papier contenant une résine polymère photosensible polymérisée. Le procédé consiste à utiliser un solvant de gonflement de résine (par exemple de l'alcool isopropylique) afin d'appliquer une quantité efficace de composés chimiques capables de ralentir la vitesse de dégradation de la résine polymère photosensible se trouvant dans la bande de fabrication de papier. La technique d'application de solvant permet d'appliquer des quantités utiles de composés chimiques aux bandes de fabrication contenant de la résine qu'il ne serait pas normalement possible d'ajouter à cause de leur faible solubilité directe dans la résine polymère et/ou l'incompatibilité de traitement. Les composés chimiques sont de préférence des antioxydants (par exemple des phénols entravés) inhibant ou retardant l'oxydation de la résine polymérisée et de ses effets de dégradation qui en découlent.

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