Repulpable, water repellant paperboard

Details Repulpable, water repellant paperboard Repulpable, water repellant paperboard

D - Textiles, Paper

21

H

D21H 11/00 (2006.01) D21C 5/02 (2006.01) D21H 13/00 (2006.01) D21H 15/00 (2006.01) D21H 19/16 (2006.01) D21H 19/18 (2006.01) D21H 19/20 (2006.01) D21H 19/44 (2006.01) D21H 19/58 (2006.01) D21H 27/40 (2006.01)

Patent

CA 2149629

The specification discloses paperboard having a water-repellant coating which includes a polymer matrix/wax mixture and which is applied to the paperboard as an aqueous formulation. The polymer matrix includes polymer chains which are ionically cross-linked through pendant carboxylic acid groups to provide, together with the wax, a substantially continuous, water-repellant film which more readily breaks down under the alkaline conditions of repulping. The figure illustrates a repulpable, water-repellant paperboard (12) coated with the water-repellant coating (26). The coated board exhibits improved release characteristics and resistance to blocking, making it particularly well-suited in corrugated box constructions used in the shipping of perishable food items such as meats, poultry, fish products, fruits and vegetables.

Carton doté d'un revêtement hydrophobe qui comporte un mélange matrice polymère-cire et qui est appliqué sur le carton sous forme de substance aqueuse. Ladite matrice polymère comprend des chaînes polymères ioniquement réticulées à travers des groupes d'acide carboxylique pendants pour obtenir, avec la cire, un film pratiquement continu hydrophobe qui se désintègre plus facilement dans des conditions alcalines de désintégration. La figure présente un carton (12) désintrégrable hydrophobe recouvert du revêtement hydrophobe (26) de la présente invention. Ledit carton possède des propriétés de non adhérence et ne colle pas par contact, ce qui le rend particulièrement adapté pour des boîtes en carton ondulé utilisées dans le transport de produits alimentaires périssables tels que de la viande, de la volaille, du poisson, des fruits et des légumes.

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