Pearlescent pigments containing ferrites

Details Pearlescent pigments containing ferrites Pearlescent pigments containing ferrites

C - Chemistry, Metallurgy

09

C

C09C 1/24 (2006.01) C09C 1/04 (2006.01) C09C 3/06 (2006.01) C09D 5/36 (2006.01)

Patent

CA 2320200

A pearlescent pigment which is a ferrite-coated iron oxide-coated platy substrate in which the ferrite is substantially free of crystallites is obtained by adding metal ions to a slurry of hydrous iron compound and platy particles and then co-calcining in the metal and iron.

L'invention concerne un pigment nacré qui est un substrat aplati en fer recouvert de ferrite et doté d'une couche d'oxyde, le ferrite étant sensiblement dépourvu de cristallites. Ce pigment est obtenu par addition d'ions métalliques à une pâte de composés de fer hydraté et de particules aplaties puis par cocalcination dans le métal et le fer.

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