Poly(vinyl alcohol) binder for calcium carbonate pigment

D - Textiles – Paper – 21 – H

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D21H 19/60 (2006.01) C09D 129/04 (2006.01) D21H 19/38 (2006.01)

Patent

CA 2387681

Production of a paper coating composition having improved low shear viscosity at a high solids level of fine particle size calcium carbonate. The improvement in low shear viscosity is achieved by dissolving a fine particle size, partially hydrolyzed, low molecular weight poly(vinyl alcohol) powder in an aqueous slurry of pigment particles containing predominantly fine particle size calcium carbonate. Dissolution of the poly(vinyl alcohol) is achieved without external heating or adding water to the slurry. The slurry can then be formulated with other components to produce the ink jet paper coating composition which, when applied to a paper substrate, provides excellent ink jet printability.

L'invention concerne la production d'une composition de couchage de papier présentant un faible coefficient de viscosité à haute teneur en matière solides de carbonate de calcium de granulométrie fine. Le coefficient de viscosité a pu être affaibli par dissolution d'une poudre d'alcool polyvinylique de granulométrie fine, partiellement hydrolysée, à faible poids moléculaire dans une suspension aqueuse de particules de pigments contenant essentiellement du carbonate de calcium de granulométrie fine. La dissolution de l'alcool polyvinylique a lieu sans chauffage externe, ni adjonction d'eau à la suspension. La suspension peut ensuite être associée à d'autres composants de manière à produire la composition de couchage de papier pour impression à jet d'encre qui, lorsqu'elle est appliquée sur un substrat de papier, fournit une excellente imprimabilité à jet d'encre.

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