US5372638A
Expired / Lapsed
US
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Aluminum flake pigment treated with metal salts and coatings containing the same
Assignee: BASF Corp
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Filing: 1992-11-27
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Granted: 1994-12-13
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Expires: 2012-11-27
Abstract
Abstract The invention is an aluminum flake pigment particle, surface treated transition metal or rare earth metal salt. The treated pigment particle has been found to be highly useful in water-borne coating compositions having a basic pH. The treated pigment particles experience significantly less hydrogen gassing in a high pH environment, and in water-borne coating compositions than untreated aluminum flake pigment particles. The treated pigment particles are also useful when combined with a pigment dispersant composition to further inhibit corrosion and gassing when the pigments are used in a coating composition.
Inventors
- 👤 Jeffrey S. DePue
- 👤 Clint W. Carpenter
- 👤 Lynne G. Bemer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:00
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/38; C09C; C09C1/00; C09C1/62; C09C1/64; C09C1/642; C09C1/644; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12; C01P2006/80; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
38 words
A composition, comprising aluminum flake pigment particles surface modified with a metal salt selected from the group consisting of cerium sulfate, cerium triacetate, cerium isopropoxide, ammonium cerium nitrate, yttrium triacetate, lanthanum triacetate, and cerium dioxide and mixtures thereof.
Claim 2
Dependent Claim
38 words
A composition, comprising aluminum flake pigment particles surface modified with a metal salt selected from the group consisting of cerium sulfate, cerium triacetate, cerium isopropoxide, ammonium cerium nitrate, yttrium triacetate, lanthanum triacetate, and cerium dioxide and mixtures thereof.
Claim 3
Dependent Claim
46 words
The composition of claim 1, wherein the metal salt is selected from the group consisting of salts of transition metals having atomic numbers 21-28; 39-42; 57 and 72-74; and salts of the lanthanide series of rare earth metals having atomic numbers of from 58 to 71.
Claim 4
Dependent Claim
35 words
The composition of claim 1, wherein the metal salt is present in an amount effective to protect the surface of the aluminum flake pigment particles from corrosion in an aqueous environment having a basic pH.
Claim 5
Dependent Claim
25 words
The composition of claim 1, wherein the metal salt is present in an amount between 0.15% and 10.0% by weight based on total pigment weight.
Claim 6
Dependent Claim
49 words
The composition of claim 1, further comprising a pigment dispersant including a polymeric backbone and at least two different substituents, wherein the first substituent has a terminal functionality that is either silane or phosphorus functional compound and the second substituent has a hydrophobic portion and a terminal hydrophilic portion.
Claim 7
Dependent Claim
24 words
The composition of claim 5, wherein the dispersant is present in an amount between 1.0 and 40.0% by weight based on total composition weight.
Claim 8
Dependent Claim
52 words
A process for treating aluminum flake pigment particles with a metal salt selected from the group consisting of cerium sulfate, cerium triacetate, cerium isopropoxide, amonium cerium nitrate, yttrium triacetate, lanthanum triacetate, and cerium dioxide and mixtures thereof, comprising forming a slurry of aluminum flake pigment particles, metal salt, water, and organic solvent.
Claim 9
Dependent Claim
52 words
A process for treating aluminum flake pigment particles with a metal salt selected from the group consisting of cerium sulfate, cerium triacetate, cerium isopropoxide, amonium cerium nitrate, yttrium triacetate, lanthanum triacetate, and cerium dioxide and mixtures thereof, comprising forming a slurry of aluminum flake pigment particles, metal salt, water, and organic solvent.
Claim 10
Dependent Claim
46 words
The process of claim 7, wherein the metal salt is selected from the group consisting of salts of transition metals having atomic numbers 21-28; 39-42; 57 and 72-74; and salts of the lanthanide series of rare earth metals having atomic numbers of from 58 to 71.
Claim 11
Dependent Claim
35 words
The process of claim 7, wherein the metal salt is present in an amount effective to protect the surface of the aluminum flake pigment particles from corrosion in an aqueous environment having a basic pH.
Claim 12
Dependent Claim
25 words
The process of claims 7, wherein the metal salt is present in an amount between 0.15% and 10.0% by weight based on total pigment weight.
Claim 13
Dependent Claim
56 words
The process of claim 7, further comprising the step of adding a pigment dispersant, wherein said dispersant includes a polymeric backbone and at least two different substituents, wherein the first substituent has a terminal functionality that is either silane or phosphorus functional compound and the second substituent has a hydrophobic portion and a terminal hydrophilic portion.
Claim 14
Dependent Claim
25 words
The process of claim 11, wherein the dispersant is present in an amount between 1.0% and 40% by weight based on total weight of pigment.
Claim 15
Dependent Claim
33 words
An aqueous coating composition, comprising: a. An aluminum flake pigment surface modified with at least one compound as described in claim 1, b. at least one water-compatible polymer and c. A crosslinking agent.
Claim 16
Independent Claim
78 words
A method of making an aqueous coating composition, comprising the steps of: a. producing an aluminum flake pigment surface modified with a transition metal or rare earth metal salt selected from the group consisting of cerium sulfate, cerium triacetate, cerium isopropoxide, ammonium cerium nitrate, yttrium triacetate, lanthanum triacetate, and cerium dioxide and mixtures thereof, by mixing the salt with the aluminum flake pigment, b. combining the surface modified aluminum flake pigment, water, and at least one water-compatible polymer.
Claim 17
Independent Claim
78 words
A method of making an aqueous coating composition, comprising the steps of: a. producing an aluminum flake pigment surface modified with a transition metal or rare earth metal salt selected from the group consisting of cerium sulfate, cerium triacetate, cerium isopropoxide, ammonium cerium nitrate, yttrium triacetate, lanthanum triacetate, and cerium dioxide and mixtures thereof, by mixing the salt with the aluminum flake pigment, b. combining the surface modified aluminum flake pigment, water, and at least one water-compatible polymer.
Claim 18
Dependent Claim
18 words
A coated article comprising a substrate with a coating thereon, wherein said coating is defined in claim 13.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1997-12-12 | 1998-06-13 | 1998-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-12 | 2002-06-13 | 2002-12-13 | $3760.00 | Window Closed / Lapsed |
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