# US 5,350,448 A · Electrically conductive pigments

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- Number: US 5,350,448 A
- Document ID: US5350448A
- Status: Granted
- Kind: A
- Application number: 08/050,797
- Filed: 1993-04-22
- Granted: 1994-09-27
- Earliest claimed: 1992-04-25
- Assignees: Merck Patent GmbH
- Inventors: Johann Dietz; Klaus Franz; Gerhard Pfaff; Reiner Vogt; Katsuhisa Nitta
- Web page: https://patentgrep.com/patent/US5350448A

## CPC

- C09C 3/063: {Coating}
- C08K 3/22: of metals
- C09C 1/0015: {Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings}
- C09C 1/3045: {Treatment with inorganic compounds}
- C09C 1/3653: {Treatment with inorganic compounds}
- C09C 1/405: {containing combined silica, e.g. mica}
- C09C 3/06: Treatment with inorganic compounds {(C09C3/006, C09C3/048 take precedence)}
- C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)}
- C09D 7/62: modified by treatment with other compounds
- C09D 11/037: characterised by the pigment
- C01P 2002/52: containing elements as dopants
- C01P 2004/20: extending in two dimensions, e.g. plate-like
- C01P 2004/54: Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/40: Electric properties
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 9/02: Ingredients treated with inorganic substances
- C09C 2200/401: Inorganic protective coating
- C09C 2220/106: comprising only a drying or calcination step of the finally coated pigment
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A process for the preparation of light-colored, electrically conductive pigments based on substrates having an expansion of not more than 500 .mu.m, which pigments consist of one or more metals, metal oxides or materials containing metal oxide, silicon oxide or silicate materials and contain, if desired above one or more other metal oxide and/or silicon oxide layers, an outer layer based on halogen-doped tin oxide and/or titanium oxide.

## Claims

### Claim 1

An light-colored, electrically conductive pigment comprising a substrate optionally coated with at least one metal oxide layer and thereon a conductive layer comprising halogen-doped tin oxide and/or halogen doped titanium oxide.

### Claim 2 (depends on 1)

A pigment according to claim 1, wherein an hydrated silicon dioxide layer or a layer of an insoluble silicate is located between the substrate surface and the outer conductive layer.

### Claim 3 (depends on 1)

A pigment according to claim 1, wherein the substrate is platelet-shaped.

### Claim 4 (depends on 3)

A pigment according to claim 3, wherein the platelet-shaped substrate comprises a sheet silicate or glass platelets.

### Claim 5 (depends on 3)

A pigment according to claim 3, wherein the platelet-shaped substrate comprises a transparent, inorganic matrix comprising an inorganic pigment.

### Claim 6 (depends on 5)

A pigment according to claim 5, wherein the matrix is silicon dioxide.

### Claim 7 (depends on 5)

A pigment according to claim 5, wherein the inorganic pigment is titanium dioxide.

### Claim 8 (depends on 3)

A pigment according to claim 3, wherein the platelet-shaped substrate comprises silicon dioxide platelets.

### Claim 9 (depends on 1)

In a pigmenting lacquer, printing ink, or plastic system comprising a pigment, the improvement wherein the pigment is one of claim 1.