US5472640A
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Conductive lamellar pigments
Assignee: Merck Patent GmbH
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Filing: 1994-04-22
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Granted: 1995-12-05
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Expires: 2014-04-22
Abstract
Abstract The application relates to conductive lamellar pigments in which lamellar substrate is coated with an electrically conductive layer, characterized in that a lamellar metal oxide or a lamellar material coated with one or more metal oxides is present as the lamellar substrate and that an optionally hydrated silicon dioxide layer or a layer of another insoluble silicate is arranged between the metal oxide layer and the conductive layer.
Inventors
- 👤 Hans D. Bruckner
- 👤 Reiner Esselborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:23
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0024; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2006/00; C01P2006/40; C09C2200/00; C09C2200/10; C09C2200/1004; C09C2200/102; C09C2220/00; C09C2220/10; C09C2220/103; C09C2220/106; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12743; Y10T428/29; Y10T428/2982; Y10T428/2989; Y10T428/2991
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
27 words
A conductive lamellar pigment comprising: a) a metal oxide-coated lamellar substrate b) a conductive layer; and c) between (a) and (b) a layer of an insoluble silicate.
Claim 2
Dependent Claim
27 words
A conductive lamellar pigment comprising: a) a metal oxide-coated lamellar substrate b) a conductive layer; and c) between (a) and (b) a layer of an insoluble silicate.
Claim 3
Dependent Claim
20 words
A pigment according to claim 1, wherein the metal oxide-coated lamellar substrate is a laminated silicate or a glass platelet.
Claim 4
Dependent Claim
17 words
A pigment according to claim 2, wherein the metal oxide-coated lamellar substrate is talc, kaolin or sericite.
Claim 5
Dependent Claim
14 words
A pigment according to claim 1, wherein the metal oxide-coated lamellar substrate is mica.
Claim 6
Dependent Claim
15 words
A pigment according to claim 1, wherein the insoluble silicate is optionally hydrated silicon dioxide.
Claim 7
Dependent Claim
13 words
A pigment according to claim 1, wherein the insoluble silicate is aluminum silicate.
Claim 8
Dependent Claim
23 words
A pigment according to claim 1, wherein the insoluble silicate is present in an amount of about 5-20% by weight relative to (a).
Claim 9
Dependent Claim
23 words
A pigment according to claim 1, wherein the insoluble silicate is present in an amount of about 5-20% by weight relative to (a).
Claim 10
Dependent Claim
16 words
A pigment according to claim 1, wherein the conductive layer is tin dioxide doped with antimony.
Claim 11
Dependent Claim
31 words
A pigment according to claim 2, wherein the metal oxide is titanium dioxide, zirconium dioxide, chromium oxide, nickel oxide, copper oxide, cobalt oxide, iron(II) oxide, iron(III) oxide or a mixture thereof.
Claim 12
Dependent Claim
14 words
A pigment according to claim 1 which is silver-white or has an interference color.
Claim 13
Dependent Claim
14 words
A pigment according to claim 1 having a specific resistance of about 20-35 Ω·cm.
Claim 14
Dependent Claim
21 words
A pigment according to claim 1 prepared by a process wherein the electroconductive layer is precipitated in a strongly acidic medium.
Claim 15
Dependent Claim
22 words
A pigment according to claim 13, prepared by a process wherein the electroconductive layer is precipitated at a pH of about 1-5.
Claim 16
Dependent Claim
18 words
A pigment according to claim 14, wherein the silicate layer is precipitated at a pH of about 6-11.5.
Claim 17
Dependent Claim
18 words
A pigment according to claim 9, wherein the ratio of tin to antimony is about 2:1 to 20:1.
Claim 18
Dependent Claim
18 words
A pigment according to claim 9, wherein the ratio of tin to antimony is about 5:1 to 10:1.
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