US4076551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon black-containing pigments and process for their preparation
Assignee: Merck Patent GmbH
•
Filing: 1976-12-10
•
Granted: 1978-02-28
•
Expires: 1996-12-10
Abstract
Abstract A process for the preparation of carbon black-containing pigments consists essentially of precipitation of a carbon black-containing metal hydroxide or bismuth oxychloride layer on substrate particles in an aqueous suspension containing carbon black particles of particle size of below 1 mn. and washing, drying and optionally calcining the products. Flaky substrates, e.g., mica flakes coated with TiO 2 , are preferably employed. Carbon black-containing pigments obtained have carbon black particles incorporated in a metal hydroxide, metal oxide or bismuth oxychloride layer precipitated on the substrate in the presence of the carbon black.
Inventors
- 👤 Horst Bernhard
- 👤 Reiner Esselborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:33
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; B; B82; B82Y; B82Y30/00; C09C1/0015; C09C1/0081; C01; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/60; C09C2200/00; C09C2200/10; C09C2200/1004; C09C2200/102; C09C2200/1054; C09C2200/1062; C09C2200/1087; C09C2200/50; C09C2200/505; C09C2220/00; C09C2220/10; Y; Y10; Y10S; Y10S106/00; Y10S106/03; Y10T; Y10T428/00; Y10T428/29; Y10T428/2911; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
56 words
In a particulate pigment comprising a substrate coated with a pigmentaceous coating which includes an amount of carbon black of between 0.1 and 25% by weight of the pigment, the improvement wherein the carbon black is embedded in a precipitated layer on the substrate of a pigmentaceous metal hydroxide or metal oxide or of bismuth oxychloride.
Claim 2
Dependent Claim
56 words
In a particulate pigment comprising a substrate coated with a pigmentaceous coating which includes an amount of carbon black of between 0.1 and 25% by weight of the pigment, the improvement wherein the carbon black is embedded in a precipitated layer on the substrate of a pigmentaceous metal hydroxide or metal oxide or of bismuth oxychloride.
Claim 3
Dependent Claim
15 words
The pigment of claim 1, wherein carbon black particles are below 1 mn. in size.
Claim 4
Dependent Claim
14 words
The pigment of claim 1, wherein the precipitated layer is aluminum hydroxide or oxide.
Claim 5
Dependent Claim
10 words
The pigment of claim 1, wherein the substrate is flake-shaped.
Claim 6
Dependent Claim
16 words
The pigment of claim 1, wherein the substrate is mica flakes coated with TiO 2 .
Claim 7
Dependent Claim
12 words
The pigment of claim 1, wherein the precipitated layer is bismuth oxychloride.
Claim 8
Independent Claim
65 words
A method for the preparation of a pigment having carbon black particles on a substrate, comprising the step of: (a) precipitating an insoluble metal hydroxide or oxide or bismuth oxychloride in an aqueous suspension of a particulate substrate and carbon black of particle size below 1 mn., thereby forming a coating on the substrate wherein the carbon black particles are embedded in the precipitated layer.
Claim 9
Independent Claim
65 words
A method for the preparation of a pigment having carbon black particles on a substrate, comprising the step of: (a) precipitating an insoluble metal hydroxide or oxide or bismuth oxychloride in an aqueous suspension of a particulate substrate and carbon black of particle size below 1 mn., thereby forming a coating on the substrate wherein the carbon black particles are embedded in the precipitated layer.
Claim 10
Dependent Claim
21 words
The method of claim 7, including a further step (b) of calcining the thus-produced pigment after separation from the reaction mixture.
Claim 11
Dependent Claim
32 words
The method of claim 7, wherein the insoluble metal hydroxide or oxide or bismuth oxychloride layer is precipitated by hydrolysis of a solution of a corresponding metal salt in the aqueous suspension.
Claim 12
Dependent Claim
13 words
The method of claim 7, wherein the aqueous suspension contains a wetting agent.
Claim 13
Dependent Claim
23 words
The method of claim 7, wherein the aqueous suspension contains 1 to 200 mg. of carbon black per gram of the particulate substrate.
Claim 14
Dependent Claim
18 words
The method of claim 7, wherein a water-soluble aluminum salt is hydrolyzed at pH between 3 and 9.
Claim 15
Dependent Claim
11 words
The method of claim 7, wherein the particulate substrate is flake-shaped.
Claim 16
Dependent Claim
16 words
The method of claim 7, wherein the characterized particulate substrate is TiO 2 -coated mica flakes.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |