Patent US3954496A successfully refreshed from Google Patents.
US3954496A
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Preparation of dense silica-encapsulated aluminum flake pigment treated with a carboxylic chromic chloride
Assignee: EIDP Inc
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Filing: 1974-10-09
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Granted: 1976-05-04
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Expires: 1994-10-09
Abstract
Abstract Dense silica-encapsulated aluminum flake pigment in aqueous suspension is treated with a carboxylic chromic chloride. Such treated pigment is stabilized against gassing when in contact with water. Aqueous-based coating compositions containing such pigment exhibit improved storage stability.
Inventors
- 👤 Kenneth Batzar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:02
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/62; C09C1/64; C09C1/648; C09C1/642; C01; C01P; C01P2004/00; C01P2004/20; C01P2004/80
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
In a process for the preparation of a dense silica-encapsulated aluminum flake pigment by the steps of precipitating said dense silica from an aqueous suspension of finely divided aluminum flake pigment which contains active silica, the improvement for stabilizing said pigment against gassing when in contact with water, wherein a carboxylic chromic chloride is added to said silica-encapsulated aluminum flake pigment in an aqueous dispersion, said carboxylic chromic chloride being added in an amount from about 2% to about 20% by weight, based on said aluminum flake pigment.
Claim 2
Dependent Claim
88 words
In a process for the preparation of a dense silica-encapsulated aluminum flake pigment by the steps of precipitating said dense silica from an aqueous suspension of finely divided aluminum flake pigment which contains active silica, the improvement for stabilizing said pigment against gassing when in contact with water, wherein a carboxylic chromic chloride is added to said silica-encapsulated aluminum flake pigment in an aqueous dispersion, said carboxylic chromic chloride being added in an amount from about 2% to about 20% by weight, based on said aluminum flake pigment.
Claim 3
Dependent Claim
27 words
Process according to claim 1 wherein the carboxylic chromic chloride is selected from the group consisting of methacrylato chromic chloride, stearato chromic chloride and myrisato chromic chloride.
Claim 4
Dependent Claim
13 words
Process according to claim 1 wherein the chromic chloride is methacrylato chromic chloride.
Claim 5
Dependent Claim
13 words
Process according to claim 1 wherein the chromic chloride is stearato chromic chloride.
Claim 6
Dependent Claim
29 words
Process according to claim 1 wherein the chromic chloride is added in an amount from about 4 to about 8 percent by weight, based on the aluminum flake pigment.
Claim 7
Dependent Claim
33 words
Process according to claim 1 wherein the temperature of said aqueous dispersion is not in excess of about 60°C. and the pH of said aqueous dispersion is not in excess of about 11.0.
Claim 8
Dependent Claim
36 words
Process according to claim 1 wherein the dense silica-encapsulated aluminum flake pigment contains from about 2 to about 30 percent by weight SiO 2 , based on the weight of the dense silica-encapsulated aluminum flake pigment.
Claim 9
Dependent Claim
36 words
Process according to claim 1 wherein the dense silica-encapsulated aluminum flake pigment contains from about 4 to about 8 percent by weight SiO 2 , based on the weight of the dense silica-encapsulated aluminum flake pigment.
Claim 10
Dependent Claim
14 words
A dense silica-encapsulated aluminum flake pigment prepared according to the process of 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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |