D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 19/44 (2006.01) D21H 19/66 (2006.01) D21H 21/30 (2006.01) D21H 23/48 (2006.01)
Patent
CA 2677013
The invention concerns a coated white paper having a fluorescence intensity higher than 55 as measured, in accordance with international standard ISO 11475: 2004, by the difference between the value of the CIE whiteness under the D65 illuminant and the value of this same CIE whiteness after the interposition of a filter that eliminates wavelengths shorter than 420 nm, and being offset-printable with no mottling defects, said coated paper comprising at least one base sheet and a printable white surface layer having a pigment composition that includes: at least some white coating pigments and at least one coating binder; at least one fluorescent whitening agent in a total quantity greater than or equal to 1% by dry weight relative to the dry weight of said pigments; at least one support substance for said whitening agent in a total quantity by dry weight greater than 2% relative to the dry weight of said pigments. The invention also concerns a method for producing this coated white paper by curtain coating said pigment composition.
L invention concerne une feuille couchée blanche ayant un pouvoir de fluorescence supérieur à 55, mesuré selon la norme internationale ISO 11475: 2004 par différence entre la valeur de la blancheur CIE sous illuminant D65 et la valeur de cette même blancheur CIE après interposition d un filtre éliminant les longueurs d onde inférieures à 420 nm, et étant imprimable par impression offset sans défaut de moutonnement, ladite feuille couchée comprenant au moins une feuille de base et une couche de surface blanche et imprimable ayant une composition pigmentée qui comporte: -au moins des pigments de couchage blancs et au moins un liant de couchage, -au moins un agent blanchissant fluorescent en une quantité totale supérieure ou égale à 1 % en poids sec par rapport au poids sec desdits pigments, -au moins une substance support dudit agent blanchissant en une quantité totale en poids sec supérieure à 2% par rapport au poids sec desdits pigments L´invention concerne aussi le procédé de réalisation de ladite feuille couchée par couchage rideau de ladite composition pigmentée.
Avazzeri Laurence
Goguelin Michel
Arjo Wiggins Fine Papers Limited
Goudreau Gage Dubuc
LandOfFree
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