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US 12,679,731 B2Granted
Use of an additive in the production of copper(II) hydroxide phosphate
AssigneeChemische Fabrik Budenheim KG
InventorsDavid Garcia Martinez, Christian Litterscheid, Franziska Welsch-Papenbreer, Rüdiger Wissemborski
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Abstract
A process for producing copper(II) hydroxide phosphate from a copper(II) compound and phosphoric acid is provided, as well as a copper(II) hydroxide phosphate obtainable by this process and the use of an additive in the production of copper(II) hydroxide phosphate.
Claims16
A method for preparing copper(II) hydroxide phosphate comprising:
- a) producing a reaction mixture from an aqueous solution or dispersion of a copper(II) compound and phosphoric acid,
- b) converting the copper(II) compound with the phosphoric acid in the reaction mixture, and phosphoric acid
- c) separating copper(II) hydroxide phosphate from the reaction mixture,
- wherein the conversion in step b) is effected in an unpressurized manner,
- wherein at least one chelating agent is added to the reaction mixture in method step a) and/or b), wherein if the chelating agent is a phosphoric acid or a salt thereof, the phosphoric acid or the salt is a di- or polyphosphoric acid or a salt thereof.
2 more elements
A method for preparing copper(II) hydroxide phosphate comprising:
- a) producing a reaction mixture from an aqueous solution or dispersion of a copper(II) compound and phosphoric acid,
- b) converting the copper(II) compound with the phosphoric acid in the reaction mixture and
- c) separating copper(II) hydroxide phosphate from the reaction mixture,
- wherein the conversion in step b) is effected in an unpressurized manner,
- wherein at least one chelating agent is added to the reaction mixture in method step a) and/or b), and
- wherein the copper(II) hydroxide phosphate obtained in method step c):
- i) has a phase purity of >95%,
- ii) has an L* value of >80 in the CIELAB L*a*b* colour space in accordance with DIN EN ISO 11664-4,
- iii) consists of particles that have a median particle size in the range of from 2 to 10 μm after determination using laser diffraction analysis in accordance with DIN-ISO 13320-1, and/or
- iv) consists of particles that are rod-shaped, wherein the aspect ratio is in the range of from 1:3 to 1:10.
7 more elements
Dependencies are inferred from the claim text.