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US4156613A
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Anti-corrosion pigments
Assignee: Bayer AG
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Filing: 1977-05-12
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Granted: 1979-05-29
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Expires: 1997-05-12
Abstract
Abstract A pigment of high anti-corrosion properties comprises (a) about 30 to 70 mole percent of at least one of MgO, ZnO and CaO, and (b) about 70 to 30 mole percent of Me 2 O 3 wherein Me 2 O 3 has the approximate molar percent composition Fe 2 O 3 : 0-100, preferably 0.5-100, most preferably 1-95, mole % Al 2 O 3 +Mn 2 O 3 : 0-100, preferably 0.5-100, most preferably 1-95, mole % Cr 2 O 3 : 0-20 mole % Is produced by calcining such oxides or compounds yielding such oxides at from about 200° ® to 650° C. with the option of going up to about 950° C. if the Al+Mn+Cr oxides total 10 mole % or more.
Inventors
- 👤 Franz Hund
- 👤 Gunter Linde
- 👤 Peter Kresse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:47
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/084; C09C; C09C1/00; C09C1/02; C09C1/04; C09C1/22; C09C1/40; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/52
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
117 words
An anti-corrosion pigment consisting essentially of (a) about 30 to 70 mole percent of at least one of MgO, ZnO and CaO, and (b) about 70 to 30 mole percent of Me 2 O 3 wherein Me 2 O 3 has the approximate molar percent composition Fe 2 O 3 : 0-95 mole % Al 2 O 3 +Mn 2 O 3 : 0.5-50 mole % Cr 2 O 3 : 0-20 mole % the pigment having a specific surface according to BET of about 0.1 to 30 m 2 /g and having a percentage weight loss per gram of pigment, as determined by the Thompson Corrosion Test, of less than about 0.05% per gram of pigment.
Claim 2
Dependent Claim
117 words
An anti-corrosion pigment consisting essentially of (a) about 30 to 70 mole percent of at least one of MgO, ZnO and CaO, and (b) about 70 to 30 mole percent of Me 2 O 3 wherein Me 2 O 3 has the approximate molar percent composition Fe 2 O 3 : 0-95 mole % Al 2 O 3 +Mn 2 O 3 : 0.5-50 mole % Cr 2 O 3 : 0-20 mole % the pigment having a specific surface according to BET of about 0.1 to 30 m 2 /g and having a percentage weight loss per gram of pigment, as determined by the Thompson Corrosion Test, of less than about 0.05% per gram of pigment.
Claim 3
Dependent Claim
47 words
An anti-corrosion pigment as claimed in claim 1, wherein Me 2 O 3 has the approximate molar percent composition Fe 2 O 3 : 5-99 mole % Al 2 O 3 +Mn 2 O 3 : 1-50 mole % Cr 2 O 3 : 0-20 mole %.
Claim 4
Dependent Claim
47 words
An anti-corrosion pigment as claimed in claim 1, wherein Me 2 O 3 has the approximate molar percent composition Fe 2 O 3 : 5-99 mole % Al 2 O 3 +Mn 2 O 3 : 1-50 mole % Cr 2 O 3 : 0.1-10 mole %
Claim 5
Dependent Claim
33 words
An anti-corrosion pigment as claimed in claim 1, having a percentage weight loss per gram of pigment, as determined by the Thompson Corrosion Test, of less than about 0.03% per gram of pigment.
Claim 6
Dependent Claim
70 words
A process for producing an anti-corrosion pigment as claimed in claim 1, wherein the pigment has a low content of aluminum oxide plus manganese oxide plus chromium oxide, the process comprising calcining the corresponding metal oxides or starting materials which give metal oxides on calcination at a temperature of from about 200° to 650° C. in the presence of at least one of an oxygen-containing gas and an inert gas.
Claim 7
Dependent Claim
19 words
A process as claimed in claim 5, wherein the calcination temperature is from about 300° C. to 600° C.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 6, wherein the calcination temperature is from about 400° C. to 600° C.
Claim 9
Dependent Claim
37 words
A process as claimed in claim 5, wherein at least one hydroxide oxide, hydroxy salt, carbonate, basic carbonate, nitrate, sulfate, chloride, formate, acetate or oxalate of Mg, Zn or Ca is present in the material being calcined.
Claim 10
Dependent Claim
57 words
A process as claimed in claim 5, wherein at least one member selected from the group consisting of Fe(II)-oxide, hydroxide, hydroxy salt, carbonate, basic carbonate, nitrate, chloride, sulfate, formate, acetate or oxalate, and iron(III)oxides is used as starting material for Fe 2 O 3 , and calcination is carried out in the presence of an oxygen-containing gas.
Claim 11
Dependent Claim
50 words
A process as claimed in claim 5, wherein at least one of α-, β- and γ-iron(III)oxides, α-, β-, γ- and δ-iron(III) oxide hydroxide, amorphous iron(III)hydroxide, iron(III)sulfate, nitrate, chloride, formate, acetate and other iron(III)salts of organic compounds and iron(II)-iron(III)-oxides is used as the starting material for Fe 2 O 3 .
Claim 12
Dependent Claim
73 words
A process as claimed in claim 5, wherein the pigment contains Al 2 O 3 , and at least one of natural or synthetically produced oxides, oxide hydroxides, hydroxides, amorphous hydroxides of aluminum, solid solutions of aluminum with iron, silicate-containing compounds of aluminum and the "red sludge" formed during the dissociation of iron-containing aluminum ore for the production of aluminum metal is used as the starting material for Al 2 O 3 .
Claim 13
Dependent Claim
52 words
A process as claimed in claim 5, wherein the pigment contains Mn 2 O 3 and at least one of naturally occurring manganese minerals, synthetically produced manganese dioxide and the manganese dioxide obtained as a waste product in organic syntheses is used as the starting material for Mn 2 O 3 .
Claim 14
Dependent Claim
27 words
A process as claimed in claim 5, wherein the starting material comprises at least one mixed hydroxide or oxide hydroxide of Fe(III), Al(III), Mn(II), Mn(III) and Cr(III).
Claim 15
Dependent Claim
66 words
A process for producing an anti-corrosion pigment as claimed in claim 1, wherein the pigment is rich in aluminum plus manganese plus chromium oxides, the process comprising calcining the corresponding metal oxides or starting materials which give metal oxides on calcination at a temperature of from about 200° to 950° C. in the presence of at least one of an oxygen-containing gas and an inert gas.
Claim 16
Dependent Claim
19 words
A process as claimed in claim 8, wherein the calcination temperature is from about 250° C. to 850° C.
Claim 17
Dependent Claim
19 words
A process as claimed in claim 8, wherein the calcination temperature is from about 300° C. to 750° C.
Claim 18
Dependent Claim
36 words
A process as claimed in claim 14, wherein at least one hydroxide, hydroxy salt, carbonate, basic carbonate, nitrate, sulfate, chloride, formate, acetate or oxalate of Mg, Zn or Ca is present in the material being calcined.
Claim 19
Dependent Claim
57 words
A process as claimed in claim 14, wherein at least one member selected from the group consisting of Fe(II)oxide, hydroxide, hydroxy salt, carbonate, basic carbonate, nitrate, chloride, sulfate, formate, acetate or oxalate, and iron(III)oxides is used as starting material for Fe 2 O 3 , and calcination is carried out in the presence of an oxygen-containing gas.
Claim 20
Dependent Claim
50 words
A process as claimed in claim 14, wherein at least one of α-, β- and γ-iron(III)oxides, α-, β-, γ- and δ-iron(III) oxide hydroxide, amorphous iron(III)hydroxide, iron(III)sulfate, nitrate, chloride, formate, acetate and other iron(III)salts of organic compounds and iron(II)-iron(III)-oxides is used as the starting materials for Fe 2 O 3 .
Claim 21
Dependent Claim
73 words
A process as claimed in claim 14, wherein the pigment contains Al 2 O 3 , and at least one of natural or synthetically produced oxides, oxide hydroxides, hydroxides, amorphous hydroxides of aluminum, solid solutions of aluminum with iron, silicate-containing compounds of aluminum and the "red sludge" formed during the dissociation of iron-containing aluminum ore for the production of aluminum metal is used as the starting material for Al 2 O 3 .
Claim 22
Dependent Claim
52 words
A process as claimed in claim 14, wherein the pigment contains Mn 2 O 3 and at least one of naturally occurring manganese minerals, synthetically produced manganese dioxide and the manganese dioxide obtained as a waste product in organic synthesis is used as the starting material for Mn 2 O 3 .
Claim 23
Dependent Claim
27 words
A process as claimed in claim 14, wherein the starting material comprises at least one mixed hydroxide or oxide hydroxide of Fe(III), Al(III), Mn(II), Mn(III) and Cr(III).
Claim 24
Dependent Claim
14 words
A varnish or a lacquer containing an anti-corrosion pigment as claimed in claim 1.
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) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |