Bismuth oxychloride nacreous pigment having improved weather...

Details Bismuth oxychloride nacreous pigment having improved weather... Bismuth oxychloride nacreous pigment having improved weather...

C - Chemistry, Metallurgy

09

D

C09D 5/36 (2006.01) C09C 1/00 (2006.01)

Patent

CA 2060963

Bismuth oxychloride nacreous pigment coated with a rare earth metal compound is described. The coated pigment is prepared by adding a rare earth metal salt solution to a suspension of bismuth oxychloride pigment crystals to form a further suspension containing the pigment crystals and cerium hydroxide. The cerium hydroxide is then precipitated out of the further suspension to coat the pigment crystals. The coated pigment is endowed with improved weather fastness.

Pigment nacré d'oxychlorure de bismuth revêtu d'un composé métallique à base d'une terre rare. Le pigment revêtu est préparé par addition d'une solution de sel métallique d'une terre rare à une suspension de pigment d'oxychlorure de bismuth en cristaux pour former une autre suspension contenant des cristaux de pigment et de l'hydroxyde de cérium. L'hydroxyde de cérium est ensuite précipité de la deuxième suspension pour revêtir les cristaux de pigment. Le pigment revêtu a une meilleure résistance aux intempéries.

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