US3871894A
Expired / Lapsed
US
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Coated chromate pigment compositions and process for producing the same
Assignee: Nippon Chemical Industrial Co Ltd
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Filing: 1973-05-17
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Granted: 1975-03-18
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Expires: 1993-05-17
Abstract
Abstract A chromate pigment having a zirconium coating thereon. Modifications include a further silica or antimony coating. The pigments illustrate superior heat, light, chemical, etc., resistance. The basic zirconium-coated pigment is produced by adding a dilute aqueous solution of a zirconium salt to an aqueous slurry of chromate pigment particles to deposit zirconium hydroxide on the surface of the particles. If the zirconium-coated pigment is to be used per se, it is filtered and dehydrated to increase the bonding of the zirconium compound to the pigment. If silica coating is to be conducted, following the dehydration the zirconium coated chromate pigment is redispersed in water and the silica deposited thereon. If antimony is to be deposited, the zirconium-coated pigment need not be dehydrated but, rather, after free water removal the product is redispersed in water and then the antimony compound deposited thereon. Necessary proportions and conditions for the products and processes are set out in the specification.
Inventors
- 👤 Shigenaga Kubo
- 👤 Nobuyoshi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:26
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/34; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
38 words
A PIGMENT COMPOSITION COMPRISING CHROMATE PARTICLES HAVING DEPOSITED THEREON A ZIRCONIUM COMPOUND IN AN AMOUNT 0.2-5% BY WEIGHT (CALCULATED AS ZRO2) BASED ON THE TOTAL AMOUNT OF CHROMATE PARTICLES PLUS ZIRCONIUM COMPOUND, AND ALSO HAVING DEPOSITED THEREON SILICA.
Claim 2
Dependent Claim
38 words
A PIGMENT COMPOSITION COMPRISING CHROMATE PARTICLES HAVING DEPOSITED THEREON A ZIRCONIUM COMPOUND IN AN AMOUNT 0.2-5% BY WEIGHT (CALCULATED AS ZRO2) BASED ON THE TOTAL AMOUNT OF CHROMATE PARTICLES PLUS ZIRCONIUM COMPOUND, AND ALSO HAVING DEPOSITED THEREON SILICA.
Claim 3
Dependent Claim
35 words
The pigment composition of claim 1 wherein the silica is amorphous silica, and is present in an amount of from 3 to 40 percent by weight of the chromate particles, zirconium compound and amorphous silica.
Claim 4
Dependent Claim
19 words
The pigment composition of claim 2 where the amount of silica is from 10 to 25 percent by weight.
Claim 5
Dependent Claim
55 words
The pigment composition as claimed in claim 1 of zirconium and silica coated lead chromate having on the surface of the lead chromate particles less than 20 percent by weight, based on the total amount of the composition, of a zirconium compound (calculated as ZrO2) and 3 - 40 percent by weight of amorphous silica.
Claim 6
Dependent Claim
166 words
A process for producing a zirconium coated and silica coated chromate pigment composition which comprises: adding a dilute aqueous solution of zirconium salt to an aqueous slurry of chromate pigment particles so that the amount of the zirconium salt is 0.2-5 percent by weight (calculated as ZrO2) based on the total weight of the final zirconium coated chromate pigment composition to deposit the zirconium hydroxide on the surface of the chromate pigment particles, thereafter filtering the zirconium coated chromate pigment composition form the system, dehydrating the zirconium coated chromate pigment composition to strongly bond the zirconium hydroxide to the chromate pigment particles and depositing amorphous silica in an amount of 3 - 40 percent by weight of the zirconium coated chromate pigment composition plus amorphous silica on the zirconium coated chromate pigment composition with the proviso that the amount of zirconium salt deposited is 0.2-5 percent by weight (calculated at ZrO2) based on the total amount of chromate pigment particles, zirconium compound and water-insoluble antimony compound.
Claim 7
Dependent Claim
166 words
A process for producing a zirconium coated and silica coated chromate pigment composition which comprises: adding a dilute aqueous solution of zirconium salt to an aqueous slurry of chromate pigment particles so that the amount of the zirconium salt is 0.2-5 percent by weight (calculated as ZrO2) based on the total weight of the final zirconium coated chromate pigment composition to deposit the zirconium hydroxide on the surface of the chromate pigment particles, thereafter filtering the zirconium coated chromate pigment composition form the system, dehydrating the zirconium coated chromate pigment composition to strongly bond the zirconium hydroxide to the chromate pigment particles and depositing amorphous silica in an amount of 3 - 40 percent by weight of the zirconium coated chromate pigment composition plus amorphous silica on the zirconium coated chromate pigment composition with the proviso that the amount of zirconium salt deposited is 0.2-5 percent by weight (calculated at ZrO2) based on the total amount of chromate pigment particles, zirconium compound and water-insoluble antimony compound.
Claim 8
Dependent Claim
33 words
The process of claim 5 wherein the amorphous silica is deposited from a silica sol system where the silica sol particles have a size of less than 200 m Mu in grain size.
Claim 9
Dependent Claim
25 words
The process of claim 6 where the majority of the silica sol particles have a size of 10 - 100 m Mu in grain size.
Claim 10
Dependent Claim
14 words
The process of claim 6 wherein silica coating is conducted under an alkaline condition.
Claim 11
Dependent Claim
12 words
The process of claim 8 where the pH is 7 - 11.
Claim 12
Dependent Claim
174 words
The process producing a zirconium and silica coated lead chromate pigment as claimed in claim 5 which comprises: a. adding a dilute aqueous solution of a zirconium salt to an aqueous slurry of lead chromate pigment particles in such amount that the resulting zirconium hydroxide content (calculated as ZrO2) will be 0.2-5 percent by weight based on the total amount of the product, to deposit zirconium hydroxide on the surface of said particles; b. after filtrating the resulting product, subjecting the product to dehydration to obtain a strongly bonded zirconium coated lead chromate; c. redispersing the resulting pigment in water, adjusting the pH of the resulting slurry to 8 - 10 and, while maintaining the temperature of the slurry above 60*C, adding 3 - 40 percent by weight, based on the total amount of the product, of siliCa sol (calculated as SiO2) or adding an aqueous solution of alkali silicate to produce an equivalent amount of silica sol, to thereby deposit amorphous silica on the surface of the zirconium coated lead chromate pigment particles.
Claim 13
Dependent Claim
156 words
A process for producing a zirconium coated and water-insoluble antimony compound coated chromate pigment composition which comprises: adding a diluted aqueous solution of a zirconium salt to an aqueous slurry of chromate pigment particles so that the amount of the zirconium salt is 0.2-10 percent by weight (calculated at ZrO2) based on the total weight of the final zirconium coated chromate pigment composition to deposit zirconium hydroxide on the surface of the chromate pigment particles, thereafter filtering the zirconium coated chromate pigment composition from the system, removing free water from the filtered product, and thereafter depositing a water-insoluble antimony compound on the zirconium coated chromate pigment composition, with the proviso that the amount of zirconium salt deposited is 0.2-10 percent by weight (calculated as ZrO2) based on the total amount of chromate pigment particles, zirconium compound and water-insoluble antimony compound, and the amount of the water-insoluble antimony compound deposited is 1-10 percent by weight, same basis.
Claim 14
Dependent Claim
156 words
A process for producing a zirconium coated and water-insoluble antimony compound coated chromate pigment composition which comprises: adding a diluted aqueous solution of a zirconium salt to an aqueous slurry of chromate pigment particles so that the amount of the zirconium salt is 0.2-10 percent by weight (calculated at ZrO2) based on the total weight of the final zirconium coated chromate pigment composition to deposit zirconium hydroxide on the surface of the chromate pigment particles, thereafter filtering the zirconium coated chromate pigment composition from the system, removing free water from the filtered product, and thereafter depositing a water-insoluble antimony compound on the zirconium coated chromate pigment composition, with the proviso that the amount of zirconium salt deposited is 0.2-10 percent by weight (calculated as ZrO2) based on the total amount of chromate pigment particles, zirconium compound and water-insoluble antimony compound, and the amount of the water-insoluble antimony compound deposited is 1-10 percent by weight, same basis.
Claim 15
Dependent Claim
123 words
The process for producing a zirconium and antimony coated chromate pigment as claimed in claim 11 which comprises adding a dilute aqueous solution of zirconium salt to an aqueous slurry of chromate pigment particles in such amount that the resulting zirconium hydroxide content (calculated as ZrO2) will be 0.2-10 percent by weight, based on the total amount of the product, to deposit zirconium hydroxide on the surface of said particles, and, after filtering the resulting product and redispersing the pigment powder in water, adding an antimony compound in such amount that 1 - 10 percent by weight (calculated as Sb2O3), based on the total amount of the composition, of a water-insoluble antimony compound is produced, then maintaining the pH at 5 - 8.
Claim 16
Dependent Claim
45 words
A PIGMENT COMPOSITION COMPRISING CHROMATE PARTICLES HAVING DEPOSITED THEREON A ZIRCONIUM COMPOUND IN AN AMOUNT OF 0.2 - 10 PERCENT BY WEIGHT (CALCULATED AS ZRO2) BASED ON THE TOTAL AMOUNT OF CHROMATE PARTICLES PLUS ZIRCONIUM COMPOUND, AND ALSO HAVING DEPOSITED THEREON A WATERINSOLUBLE ANTIMONY COMPOUND.
Claim 17
Dependent Claim
45 words
A PIGMENT COMPOSITION COMPRISING CHROMATE PARTICLES HAVING DEPOSITED THEREON A ZIRCONIUM COMPOUND IN AN AMOUNT OF 0.2 - 10 PERCENT BY WEIGHT (CALCULATED AS ZRO2) BASED ON THE TOTAL AMOUNT OF CHROMATE PARTICLES PLUS ZIRCONIUM COMPOUND, AND ALSO HAVING DEPOSITED THEREON A WATERINSOLUBLE ANTIMONY COMPOUND.
Claim 18
Dependent Claim
33 words
The pigment composition of claim 13 wherein from 1 - 10 percent by weight of water-insoluble antimony compound is present, based on the total weight of chromate particles, zirconium plus water-insoluble antimony compound.
Claim 19
Dependent Claim
17 words
The pigment composition of claim 14 where the water-insoluble antimony compound is antimony hydroxide or antimony oxide.
Claim 20
Dependent Claim
20 words
The pigment composition of claim 15 where the amount of water-insoluble antimony compound is from 3 to 5% by weight.
Claim 21
Dependent Claim
22 words
The pigment composition of claim 14 where the zirconium compound and the water-insoluble antimony compound are coated in a distinct 2-layer form.
Claim 22
Dependent Claim
21 words
The pigment composition of claim 14 where the zirconium compound and the water-insoluble antimony compound are present in a mixed state.
Claim 23
Dependent Claim
57 words
The pigment composition as claimed in claim 13 of zirconium and antimony coated lead chromate having on the surface of the lead chromate particles 0.2 - 10 percent by weight, based on the total amount of the composition, of a zirconium compound (calculated as ZrO2) and 1 - 10 percent by weight of a water-insoluble antimony compound.
References Cited (Backward Citations)
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US3053685A
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US3080248A
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US3434857A
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US3690906A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |