Claims
- 1. A method for the preparation of a chromatic-color metal flake pigment which comprises the steps of:
- (a) hydrolyzing a hydrolyzable organic titanate ester compound in an organic medium in the presence of flakes of a metal dispersed therein to deposit an oxide of titanium on the surface of the metal flakes in the form of a coating layer;
- (b) collecting the titanium oxide-coated metal flakes; and
- (c) calcining the titanium oxide-coated metal flakes.
- 2. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 1, wherein said metal is selected from the group consisting of aluminum, bronze, stainless steel, tin and iron; and said coating layer is of a thickness of 40 nm to 155 nm.
- 3. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 2 wherein the hydrolyzable organic titanate ester compound is represented by the general formula ##STR3## in which R is an alkyl group having 2 to 10 carbon atoms and the subscript n is a positive integer not exceeding 10.
- 4. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 2 wherein the organic medium has a pH in the range from 4 to 8.
- 5. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 2 wherein the hydrolyzable organic titanate ester is hydrolyzed by adding the same to a suspension of the metal flakes in the organic medium containing water.
- 6. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 5 wherein the concentration of the hydrolyzable titanate ester in the organic medium is in the range from 0.001 to 1 mole/liter.
- 7. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 2 wherein the hydrolysis of the organic titanate ester compound is performed at a temperature in the range from 15.degree. to 80.degree. C.
- 8. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 5 wherein the hydrolyzable titanate ester compound is added to the organic medium containing water at a rate in the range from 1.0.times. 10.sup.-7 to 1.0.times.10.sup.31 4 mole/minute per square meter of the surface area of the metal flakes.
- 9. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 8 wherein the rate of addition of water is in the range from 1.0.times.1.0.sup.-3 to 1.0 mole per minute per mole of the organic titanate ester compound.
- 10. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 2 wherein the calcination in step (c) is performed at a temperature of 200.degree. C. or higher but not exceeding the melting point of the metal of the metal flakes.
- 11. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 2 wherein the coating comprises one coating.
- 12. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 3 wherein
- the organic medium has a pH in the range from 4 to 8;
- the hydrolyzable organic titanate ester is hydrolyzed by adding the same to a suspension of the metal flakes in the organic medium containing water;
- the hydrolysis of the organic titanate ester compound is performed at a temperature in the range from 15.degree. to 80.degree. C.;
- the hydrolyzable titanate ester compound is added to the organic medium containing water at a rate in the range from 1.0.times.10.sup.-7 to 1.0.times.10.sup..times.4 mole/minute per square meter of the surface area of the metal flakes;
- the rate of addition of water is in the range from 1.0.times.1.0.sup.-3 to 1.0 mole per minute per mole of the organic titanate ester compound; and
- the calcination in step (c) is performed at a temperature of 200.degree. C. or higher but not exceeding the melting point of the metal of the metal flakes.
- 13. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 12 wherein the concentration of the hydrolyzable titanate ester in the organic medium is in the range from 0.001 to 1 mole/liter.
- 14. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 13 wherein said metal flake pigment is an aluminum flake pigment.
- 15. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 13 wherein said metal flake pigment is an bronze flake pigment.
- 16. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 13 wherein said metal flake pigment is an stainless steel flake pigment.
- 17. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 13 wherein said metal flake pigment is an tin flake pigment.
- 18. The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 13 wherein said metal flake pigment is an iron flake pigment.
Priority Claims (2)
Number |
Date |
Country |
Kind |
63-16657 |
Jan 1988 |
JPX |
|
63-319246 |
Dec 1988 |
JPX |
|
Parent Case Info
This application is a divisional application of Ser. No. 07/714,313 filed Jun. 10, 1991, now U.S. Pat. No. 5,091,010, which is a continuation-in-part application of Ser. No. 07/300,613 filed Jan. 23, 1989 (abandoned).
US Referenced Citations (11)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0351932 |
Jan 1990 |
EPX |
53-77225 |
Jul 1978 |
JPX |
61-118461 |
Jun 1986 |
JPX |
1237866 |
Jun 1971 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
714313 |
Jun 1991 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
300613 |
Jan 1989 |
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