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EP0328906A2
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EP
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Chromatic-color metal flake pigment, method for the preparation thereof and colored composition compounded therewith
Assignee: NOF Corp
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Filing: 1989-01-25
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Granted: —
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Expires: 2009-01-25
Abstract
Abstract A titanium oxide-coated chromatic-color metal flake pigment is prepared by hydrolyzing an oganic titanate ester compound, e.g., tetraisopropoxy titanium, in the presence of the base metal flakes suspended in an organic medium having a pH of 4 to 8. The pigment exhibits iridescent color tones of great aesthetic value delicately varying depending on the thickness of the titanium oxide coating layer. The pigment has high chemical stability, for example, against acids, by virtue of the very uniform and dense coating layer of titanium oxide so that the inventive pigment is useful as a coloring agent in a water-borne composition. Application fields of the inventive pigment include colored coating compositions, ink compositions, cosmetic preparations, molding compounds of plastic resins and so on.
Inventors
- 👤 Thoru Souma
- 👤 Masahiro Ishidoya
- 👤 Toshihiko Nakamichi
- 👤 Naoe Takai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:30
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0021; A; A61; A61K; A61K8/00; A61K8/02; A61K8/0241; A61K8/0254; A61K8/18; A61K8/19; A61K8/29; A61Q; A61Q1/00; A61Q1/02; B; B82; B82Y; B82Y30/00; C08; C08K; C08K9/00; C08K9/02; C09C1/62; C09D; C09D11/00; C09D11/02; C09D11/03; C09D11/037; C09D5/00; C09D5/36; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/412; A61K2800/42; A61K2800/43; A61K2800/436; A61K2800/60; A61K2800/61; A61K2800/62; A61K2800/621; A61Q1/10; C01; C01P; C01P2004/00; C01P2004/20; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2004/80; C01P2006/00; C01P2006/12; C01P2006/60; C01P2006/65; C01P2006/80; C09C2200/00; C09C2200/10; C09C2200/1054; C09C2200/30; C09C2200/301; C09C2220/00; C09C2220/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
39 words
A chromatic-color metal flake pigment which comprises: a) flakes of a metal; and b) a coating layer of titanium oxide on the surface of the metal flakes formed by being deposited by hydrolyzing a hydrolyzable organic titanate ester compound.
Claim 2
Dependent Claim
39 words
A chromatic-color metal flake pigment which comprises: a) flakes of a metal; and b) a coating layer of titanium oxide on the surface of the metal flakes formed by being deposited by hydrolyzing a hydrolyzable organic titanate ester compound.
Claim 3
Dependent Claim
47 words
The chromatic-color metal flake pigment as claimed in claim 1 wherein the hydrolyzable organic titanate ester compound is represented by the general formula in which R is an alkyl group having 2 to 10 carbon atoms and the subscript n is a positive integer not exceeding 10.
Claim 4
Dependent Claim
33 words
The chromatic-color metal flake pigment as claimed in claim 1 wherein the hydrolyzable organic titanate ester compound is hydrolyzed in an organic medium having a pH in the range from 4 to 8.
Claim 5
Dependent Claim
38 words
The chromatic-color metal flake pigment as claimed in claim 1 wherein the metal flakes have an average particle diameter in the range from 1 to 100 /.Lm and a thickness in the range from 0.01 to 20 urn.
Claim 6
Dependent Claim
28 words
The chromatic-color metal flake pigment as claimed in claim 1 wherein the metal is selected from the group consisting of aluminum, titanium, bronze, stainless steel, tin and iron.
Claim 7
Independent Claim
73 words
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.
Claim 8
Independent Claim
73 words
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.
Claim 9
Dependent Claim
53 words
The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 7 wherein the hydrolyzable organic titanate ester compound is represented by the general formula in which R is an alkyl group having 2 to 10 carbon atoms and the subscript n is a positive integer not exceeding 10.
Claim 10
Dependent Claim
30 words
The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 7 wherein the organic medium has a pH in the range from 4 to 8.
Claim 11
Dependent Claim
41 words
The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 7 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.
Claim 12
Dependent Claim
37 words
The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 10 wherein the concentration of the hydrolyzable titanate ester in the organic medium is in the range from 0.001 to 1 mole/liter.
Claim 13
Dependent Claim
38 words
The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 1 wherein the hydrolysis of the organic titanate ester compound is performed at a temperature in the range from 15 to 80 C.
Claim 14
Dependent Claim
57 words
The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 9 wherein the hydrolyzable titanate ester compound is added to the organic medium containing water at a rate in the range from 1.0 x 10- 7 to 1.0 x 10-4 mole/minute per square meter of the surface area of the metal flakes.
Claim 15
Dependent Claim
45 words
The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 10 wherein the rate of addition of water is in the range from 1.0 x 1.0- 3 to 1.0 mole per minute per mole of the organic titanate ester compound.
Claim 16
Dependent Claim
45 words
The method for the preparation of a chromatic-color metal flake pigment as claimed in claim 7 wherein the calcination in step (c) is performed at a temperature of 200 °C or higher but not exceeding the melting point of the metal of the metal flakes.
Claim 17
Dependent Claim
29 words
A coating composition-which comprises, as a coloring agent, from 0.1 to 70% by weight, based on the film-forming resin, of a chromatic-color metal flake pigment according to claim 1.
Claim 18
Dependent Claim
30 words
An ink composition which comprises, as a coloring agent, from 0.1 to 70% by weight, based on the film-forming ingredient, of a chromatic-color metal flake pigment according to claim 1.
Claim 19
Dependent Claim
29 words
A cosmetic preparation which comprises from 0.1 to 50% by weight of a chromatic-color metal flake pigment according to claim 1 based on the overall amount of the composition.
Claim 20
Dependent Claim
36 words
A molding compound of plastic resin which comprises, as a coloring agent, from 0.1 to 50% by weight of a chromatic-color metal flake pigment according to claim 1 based on the overall amount of the compound.
References Cited (Backward Citations)
No citation records indexed.
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