# US 4,400,365 A · Method for the manufacture of aluminum zinc phosphate hydrates or basic aluminum zinc phosphate hydrates

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- Number: US 4,400,365 A
- Document ID: US4400365A
- Status: Granted
- Kind: A
- Application number: 06/326,184
- Filed: 1981-12-01
- Granted: 1983-08-23
- Earliest claimed: 1980-12-11
- Assignees: Goslarer Farbenwerke; Dr. Hans Heubach GmbH & Co. KG
- Inventors: Wigo Haacke; Gerhard Adrian; Manfred Gawol; Rainer Henbach; 37
- Web page: https://patentgrep.com/patent/US4400365A

## CPC

- C09C 1/40: Compounds of aluminium {(C09C1/0009, C09C1/0015, C09C1/0078, C09C1/32 take precedence)}
- C01B 25/45: containing plural metal, or metal and ammonium
- C09D 5/084: {Inorganic compounds}
- C01P 2002/08: Intercalated structures, i.e. with atoms or molecules intercalated in their structure
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

Aluminum zinc phosphate hydrates or basic aluminum zinc phosphate hydrates are manufactured by reacting 1 mole of aluminum hydrogen phosphate with from 2.4 to 4 moles of zinc oxide, if necessary with the addition of up to 0.4 moles of alkali aluminate or the equivalent quantity of alkali hydroxide. A 50% by weight acidic aluminum hydrogen phosphate solution is preferably used for the reaction which is carried out at an elevated temperature in the range from 30.degree. to 80.degree. C. The aluminum zinc phosphate hydrates produced by the method are useful anti-corrosion pigments for use in paints.

## Claims

### Claim 1

A method for the manufacture of aluminum zinc phosphate hydrates or basic aluminum zinc phosphate hydrates comprising reacting 1 mole of aluminum hydrogen phosphate with 2.4 to 4 moles of zinc oxide and, thereafter, recovering the aluminum zinc phosphate hydrates or basic aluminum zinc phosphate hydrates.

### Claim 2 (depends on 1)

A method in accordance with claim 1 wherein the aluminum hydrogen phosphate is a 50% by weight solution of acidic aluminum hydrogen phosphate.

### Claim 3 (depends on 1, 2)

A method in accordance with one of the claims 1 or 2 wherein the reaction is carried out at an elevated temperature of 30.degree. C. to 80.degree. C.

### Claim 4 (depends on 3)

A method in accordance with claim 3 wherein the reaction is carried out at a temperature of approximately 50.degree. C.

### Claim 5 (depends on 1)

A method in accordance with claim 1 further comprising the step of neutralizing excess acidic aluminum hydrogen phosphate with an alkali aluminate.

### Claim 6 (depends on 1)

A method in accordance with claim 1 wherein the proportion of AlPO.sub.4 and of alumina hydrate, respectively, is increased in dependence on the quantities of zinc oxide and aluminum hydrogen phosphate by adding alkali aluminate or alkali hydroxide, respectively.

### Claim 7 (depends on 1)

A method in accordance with claim 1 wherein the 1 mole of aluminum hydrogen phosphate is reacted with 3.15 to 3.50 moles of zinc oxide.

### Claim 8 (depends on 5)

A method in accordance with claim 5 wherein the alkali aluminate is sodium aluminate.

### Claim 9 (depends on 1)

A method in accordance with claim 1 wherein excess acidic aluminum hydrogen phosphate is neutralized by adding an alkali hydroxide.

### Claim 10 (depends on 9)

A method in accordance with claim 9 wherein the alkali hydroxide is sodium hydroxide.

### Claim 11 (depends on 1)

A method in accordance with claim 1 wherein less than 3 moles of zind oxide are used per mole of aluminum hydrogen phosphate, and further comprising the step of adding an alkali aluminate in a quantity of up to 0.5 moles, or the equivalent quantity of an alkali hydroxide.