	US 12,421,116 B2
	Phosphate-containing anti-corrosive pigment
Sven Bach, Hohenstein (DE); Laura Erbach, Argenschwang (DE); Birgit Faßbender, Mainz (DE); Thomas Futterer, Ingelheim (DE); David Garcia Martinez, Saragossa (ES); Christian Litterscheid, Ober-Olm (DE); Stefan Mallmann, Heidesheim (DE); Siegfried Mengel, Frei-Laubersheim (DE); Sebastian Moschel, Groß-Gerau (DE); Mikel Schöller, Bingen (DE); Hendrik Wermter, Eltville (DE); and Rüdiger Wissemborski, Neuruppin (DE)
Assigned to Chemische Fabrik Budenheim KG, Budenheim (DE)
Appl. No. 17/784,555
Filed by Chemische Fabrik Budenheim KG, Budenheim (DE)
PCT Filed Dec. 7, 2020, PCT No. PCT/EP2020/084914 § 371(c)(1), (2) Date Jun. 10, 2022, PCT Pub. No. WO2021/116030, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 10 2019 134 205.8 (DE), filed on Dec. 12, 2019; and application No. 10 2020 107 797.1 (DE), filed on Mar. 20, 2020.
Prior Publication US 2025/0263298 A1, Aug. 21, 2025
Int. Cl. C01B 25/32 (2006.01); C08K 3/32 (2006.01); C09D 5/08 (2006.01)

CPC C01B 25/321 (2013.01) [C08K 3/32 (2013.01); C09D 5/084 (2013.01); C08K 2003/321 (2013.01); C08K 2201/006 (2013.01)]

14 Claims

1. A method for producing a phosphate-containing anti-corrosion pigment, comprising the following steps:

a) providing hydroxyapatite or calcium-magnesium-phosphate particles or mixtures of the aforementioned as start particles in an aqueous solvent or dispersant,

b) adding lime milk, a magnesium compound, and phosphoric acid to the aqueous solvent or dispersant in order to produce a reaction mixture,

c) reacting the reaction mixture to form the phosphate-containing anti-corrosion pigment:

at a temperature in the range of 20° C. to 105° C. and

at a pH value in the range of 6.0 to 13.0,

d) separating at least a part of the phosphate-containing anti-corrosion pigment from the aqueous solvent or dispersant, and

e) Optionally: drying the phosphate-containing anti-corrosion pigment.