A procedure for manufacturing an aqueous formulation based...

C - Chemistry – Metallurgy – 08 – F

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C08F 220/32 (2006.01) D21H 17/36 (2006.01) D21H 17/37 (2006.01) D21H 17/38 (2006.01) D21H 17/39 (2006.01) D21H 19/24 (2006.01)

Patent

CA 2689245

The invention relates to a method for preparing a composition, characterised in that it comprises the steps of: a) preparing an aqueous solution of at least one comb polymer of (meth)acrylic acid having an alkoxy and/or hydroxy polyalkylene glycol function grafted thereon; b) preparing an aqueous emulsion of at least one acrylic thickener; c) mixing the aqueous solution of step a) and the aqueous emulsion of step b) with the optional addition of water; and in that it comprises partially neutralising the comb polymer during step a) and/or step c) in order to obtain a mixture having a pH between 5.5 and 6.8, preferably between 5.8 and 6.3. The invention also relates to the product thus obtained and to the use thereof in a paper coating slip as a thickening agent for said slip and/or as a water retention agent for said slip and/or as an agent for improving the gloss and/or the optical azuration of the paper coated with said slip.

La présente invention concerne un procédé de fabrication d'une composition, caractérisé en ce qu'il comprend les étapes de : a) préparer une solution aqueuse d'au moins un polymère peigne de l'acide (méth)acrylique sur lequel est greffée une fonction alkoxy et / ou hydroxy polyalkylène glycol, b) préparer une émulsion aqueuse d'au moins un épaississant acrylique, c) mélanger la solution aqueuse de l'étape a) avec Pémulsion aqueuse de l'étape b), éventuellement en ajoutant de l'eau, et en ce qu'on neutralise partiellement le polymère peigne au cours de l'étape a) et / ou de l'étape c), de manière à obtenir un mélange dont le pH est compris entre 5,5 et 6,8, préférentiellement entre 5,8 et 6,3. L'invention concerne aussi le produit obtenu et son utilisation dans une sauce de couchage papetière, comme agent épaississant de ladite sauce et / ou comme agent rétenteur d'eau de ladite sauce et / ou comme agent améliorant la brillance et / ou l'azuration optique du papier couché à partir de ladite sauce.

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