Coating formulation for an offset paper and paper coated...

D - Textiles – Paper – 21 – H

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Details

D21H 19/38 (2006.01) B41M 5/50 (2006.01) B41M 5/52 (2006.01) D21H 21/52 (2006.01)

Patent

CA 2698474

The document describes a coated paper for offset printing e.g. with a TAPPI 75° gloss value of below 35% or with high gloss properties, comprising at least on one side a top coating layer, said top coating layer comprising a pigment part, the 100 parts in dry weight thereof comprising in the range of 5 - 40 parts in dry weight of a fine particulate ground calcium carbonate with surface and internal structure modification as a result of treatment with one or more medium to strong H3O+ providers and eventually additional treatment with gaseous carbon dioxide, a binder part of 2 - 20 parts in dry weight of binder and (regular) additives in the range of 0 - 8 parts in dry weight.

L'invention concerne un papier enduit pour impression offset, qui présente par exemple un degré de brillance TAPPI 75° inférieur à 35 %, ou d'excellentes propriétés de brillance. Ce papier comprend, sur une face au moins, une couche d'enduit supérieure qui comporte elle-même une partie de pigment. Sur les 100 parties en poids sec de ce pigment, 5 à 40 parties sont constituées d'un carbonate de calcium broyé en fines particules, ayant subi une modification de surface et de structure interne, suite à un traitement avec un ou plusieurs donneurs d'ions H3O+ moyens à forts, et éventuellement à un autre traitement avec du dioxyde de carbone gazeux. Enfin, ladite couche d'enduit supérieure comprend également une partie de liant constituée de 2 à 20 parties en poids sec de liant, ainsi que des additifs (classiques) représentant 0 à 8 parties en poids sec.

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