Hollow organic pigment core binder coated paper and...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 19/56 (2006.01) B32B 29/00 (2006.01) D21H 21/54 (2006.01) D21H 23/04 (2006.01) D21H 23/24 (2006.01)

Patent

CA 2601958

A coating for paperboard comprises an aqueous dispersion of a hollow core binder comprising a first polymer that, when dry, has at least one void, the first polymer being substantially encapsulated by at least one second polymer having a glass transition temperature (T g) ranging from more than -15°C and up to and including 30°C, wherein the weight ratio of the said second polymer to the said first polymer ranges from 1:1 to 4:1. One or both of the first polymer and the second polymer may be formed from, as polymerized units, at least one ethylenically unsaturated monomer. The hollow core binder allows for glossy, bright and smooth paperboard coatings while reducing the amount of binder and opacifying pigment necessary to achieve such coating properties. The present invention also provides coated paperboard articles, as well as paper and paperboard that is made from a mixture of pulp with the inventive hollow core binder.

Revêtement pour carton comprenant une dispersion aqueuse d'un liant à cour vide comportant un premier polymère qui, une fois sec, compte au moins un vide, le premier polymère étant encapsulé de manière substantielle dans au moins un second ayant une température de transition vitreuse (Tg) située entre plus de -15 degrés Celsius et jusqu'à 30 degrés Celsius, inclusivement, où le rapport en poids du second polymère en question au premier polymère va de 1:1 à 4:1. Le premier polymère, le second ou les deux peuvent être formés, comme unités polymérisées, à partir d'au moins un monomère éthylénique insaturé. Le liant permet d'obtenir un revêtement glacé, brillant et lisse pour le carton tout en réduisant la quantité de liant et en pigment opacifiant nécessaire pour avoir ces propriétés. La présente invention fournit aussi des articles en carton revêtu ainsi que du papier et du carton fabriqués à partir d'un mélange de pulpe avec le liant à cour vide.

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