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US4400365A
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Method for the manufacture of aluminum zinc phosphate hydrates or basic aluminum zinc phosphate hydrates
Assignee: GOSLARER FARBENWERKE DR HANS HEUBACH & Co KG A GERMAN CORP GmbH
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Filing: 1981-12-01
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Granted: 1983-08-23
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Expires: 2001-12-01
Abstract
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° to 80° C. The aluminum zinc phosphate hydrates produced by the method are useful anti-corrosion pigments for use in paints.
Inventors
- 👤 Wigo Haacke
- 👤 Gerhard Adrian
- 👤 Manfred Gawol
- 👤 Rainer Henbach
- 👤 37
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:10
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/084; C01P; C01P2002/00; C01P2002/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
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
Independent Claim
46 words
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 3
Dependent Claim
23 words
A method in accordance with claim 1 wherein the aluminum hydrogen phosphate is a 50% by weight solution of acidic aluminum hydrogen phosphate.
Claim 4
Independent Claim
28 words
A method in accordance with one of the claims 1 or 2 wherein the reaction is carried out at an elevated temperature of 30° C. to 80° C.
Claim 5
Dependent Claim
20 words
A method in accordance with claim 3 wherein the reaction is carried out at a temperature of approximately 50° C.
Claim 6
Dependent Claim
22 words
A method in accordance with claim 1 further comprising the step of neutralizing excess acidic aluminum hydrogen phosphate with an alkali aluminate.
Claim 7
Dependent Claim
40 words
A method in accordance with claim 1 wherein the proportion of AlPO 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 8
Dependent Claim
25 words
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 9
Dependent Claim
14 words
A method in accordance with claim 5 wherein the alkali aluminate is sodium aluminate.
Claim 10
Dependent Claim
20 words
A method in accordance with claim 1 wherein excess acidic aluminum hydrogen phosphate is neutralized by adding an alkali hydroxide.
Claim 11
Dependent Claim
14 words
A method in accordance with claim 9 wherein the alkali hydroxide is sodium hydroxide.
Claim 12
Dependent Claim
49 words
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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |