Use of starch dispersions as binder in coating compositions...

Details Use of starch dispersions as binder in coating compositions... Use of starch dispersions as binder in coating compositions...

D - Textiles, Paper

21

H

D21H 19/54 (2006.01) C08L 3/02 (2006.01) C09D 103/04 (2006.01)

Patent

CA 2419949

The invention is directed to coating compositions comprising a pigment and starch dispersion of discrete crosslinked starch particles in an aqueous liquid. The dispersion may be used as coating color for paper. A preferred process of preparing said dispersion of starch particles comprises (a) obtaining a mixture of starch and an aqueous liquid; (b) processing the mixture using shear forces in the presence of a crosslinker in an extruder; and (c) injecting a hydroxylic liquid into the extruder and dispersing the mixture inside the extruder or outside the extruder or both inside and outside the extruder to obtain the dispersion.

Cette invention a trait à des compositions d'enduction renfermant un pigment et une dispersion d'amidon, faite de particules réticulées et séparées d'amidon dans un liquide aqueux. On peut utiliser cette dispersion comme sauce de couchage pour du papier. Un procédé préféré de préparation de ces dispersions de particules d'amidon consiste, (à ), à obtenir un mélange d'amidon et de liquide aqueux, (b), à traiter ce mélange an utilisant des forces de cisaillement en présence d'un agent de réticulation dans une extrudeuse et, (c), à injecter un liquide hydroxylique dans l'extrudeuse, puis à disperser le mélange à l'intérieur de l'extrudeuse ou à l'extérieur de celle-ci ou bien à l'intérieur ainsi qu'à l'extérieur de l'extrudeuse pour obtenir la dispersion.

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