Security paper adapted to resist fraudulent alteration

D - Textiles – Paper – 21 – H

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D21H 21/40 (2006.01) D21H 19/20 (2006.01)

Patent

CA 2430478

Security paper adapted to resist fraudulent alteration of toner-printed information thereon and to make such alteration or attempts at alteration evident has a maximum Scott-Bond strength of 150 J m-2; a Bendtsen roughness of not more than about 150 ml min-1; and is size press or otherwise treated with a thermally-softenable polymer composition, for example acrylic polymer or copolymer, a polyvinyl acetate polymer, a vinyl acetate/ethylene copolymer, or a vinyl acetate/vinyl chloride/ethylene terpolymer. Preferably the paper has filler content of about 15 % to about 20 % by weight.

L'invention concerne un papier de sécurité conçu pour résister à une altération frauduleuse d'une information imprimée au toner sur le papier, et pour rendre une telle altération ou tentative d'altération visible. Le papier de sécurité de l'invention présente une résistance de Scott-Bond de 150 J m?-2¿; et une rugosité de Bendtsen d'au plus environ 150 ml min?-1¿. Le papier de l'invention est traité à la presse encolleuse ou autre, au moyen d'une composition polymère thermiquement adoucissable, par exemple un polymère ou copolymère acrylique, un polymère d'acétate de polyvinyle, un copolymère d'acétate de vinyle et d'éthylène, ou un terpolymère d'acétate de vinyle, de chlorure de vinyle et d'éthylène. Le papier de l'invention présente, de préférence, une teneur de la charge d'environ 15 à 20 % en poids.

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