Pigments

C - Chemistry – Metallurgy – 09 – C

Patent

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6/200, 117/48.2

C09C 1/36 (2006.01) C08K 9/02 (2006.01) C09C 3/06 (2006.01) D21H 17/69 (2006.01) D21H 19/38 (2006.01)

Patent

CA 2038885

A new process for the production of pigments suitable for use in paper laminates has been developed in which a metal oxide is treated with a water-soluble salt of zinc or a phosphate or phosphoric acid and subsequently with an alkali metal aluminate in such a manner that there is deposited on the metal oxide a coating containing zinc and phosphate ions together with aluminium ions. The pH of the dispersion following the metal oxide is maintained at a value not exceeding 8.0 during precipitation. A particularly useful pigment is produced which has a coating containing zinc ions in an amount of 0.5 to 5% by weight as ZnO, phosphate ions in an amount of 0.2 to 3% as P2O5 and aluminium ions in an amount of 0.5 to 5% expressed as Al2O3 on the weight of TiO2.

On a mis au point une nouvelle méthode pour la production de pigments utiles dans les stratifiés de papier, où un oxyde de métal est traité avec un sel hydrosoluble de zinc ou un phosphate ou l'acide phosphorique, puis avec un aluminate de métal alcalin, de telle façon qu'il se dépose sur l'oxyde métallique un revêtement contenant des ions zinc et phosphate de concert avec des ions aluminium. Après le traitement de l'oxyde de métal, le pH de la dispersion est maintenu à une valeur ne dépassant pas 8,0 durant la précipitation. On obtient un pigment particulièrement utile, possédant un revêtement qui contient des ions zinc à raison de 0,5 à 5 % en poids sous forme de ZnO, des ions phosphate à raison de 0,2 à 3 % sous forme de P2O5, et des ions aluminium à raison de 0,5 à 5 % sous forme de Al2O3, pourcentages exprimés par rapport au poids de TiO2.

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