DIELECTRIC COATINGS AND ARTICLES

• US 20130244022A1
• Filed: 11/02/2011
• Published: 09/19/2013
• Est. Priority Date: 12/01/2010
• Status: Active Grant

• Current Assignee: Merck Patent GmbH (Merck & Co., Inc.)
• Original Assignee: Merck Patent GmbH (Merck & Co., Inc.)
• Inventors: Rueger, Reinhold, Kuntz, Matthias
• Granted Patent: US 10,640,658 B2
• Time in Patent Office: Days
• US Class Current: 428/324
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C09D 101/18 Cellulose nitrate
• CPC Class Codes: C09D 5/24 Electrically-conducting paints conductive materials H01B1/00
• CPC Class Codes: C09D 7/41 Organic pigments; Organic dyes
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: H01B 3/004 with conductive additives or conductive layers
• CPC Class Codes: H01B 3/185 Substances or derivates of cellulose
• CPC Class Codes: Y10T 428/251 Mica
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide

Abstract

The present invention relates to dielectric coatings and articles having high, but precisely defined specific surface resistances.

Claims

1. Dielectric coatings and articles, characterised in that the coatings and articles, in each case having specific surface resistances of greater than or equal to 10⁸ ohm, comprise one or more semiconducting pigments, a dielectric binder and optionally further dielectric additives, where the pigment volume concentration of the semiconducting pigment in the dielectric coating or in the article is ≧

10%.

2. Dielectric coatings and articles according to claim 1, characterised in that the specific powder resistance of the semiconducting pigment is ≧

100 kohm*cm and less than 1 gigaohm·

cm.

3. Dielectric coatings and articles according to claim 1, characterised in that the specific powder resistance of the semiconducting pigment is greater than 100 kohm*cm and less than 1 gigaohm·

cm.

4. Dielectric coatings and articles according to claim 1, characterised in that the semiconducting pigment consists of tin oxide, doped tin dioxide, supports coated with tin oxide or doped tin dioxide, doped titanium dioxide, titanium suboxide, or supports coated with titanium dioxide or titanium suboxide.

5. Dielectric coatings and articles according to claim 1, characterised in that the pigment is selected from the group

mica flake+SnO₂ layer (doped)

mica flake+SnO₂ layer (doped)+TiO₂ layer

mica flake+SnO₂ layer (doped)+SiO₂ layer

mica flake+SnO₂ layer (doped)+ZnO layer

mica flake+SnO₂ layer (doped)+Cr₂O₃ layer

mica flake+SnO₂ layer (doped)+Al₂O₃ layer

Al₂O₃ flake+SnO₂ layer (doped)

Al₂O₃ flake+SnO₂ layer (doped)+TiO₂ layer

Al₂O₃ flake+SnO₂ layer (doped)+SiO₂ layer

Al₂O₃ flake+SnO₂ layer (doped)+ZnO layer

Al₂O₃ flake+SnO₂ layer (doped)+Cr₂O₃ layer

Al₂O₃ flake+SnO₂ layer (doped)+Al₂O₃ layer.

6. In a sensor, security application, floorcovering, film, ceramic material, glass, paper laser marking, thermal protection, photosemiconductor, or functional material for high-voltage technology comprising a dielectric coating the improvement wherein the dielectric coating is according to claim 1.

7. A sensor according to claim 6, wherein said sensor is a flat contact sensor.

8. A method the specific setting of the electrical properties of end corona shielding systems in rotating electrical machines comprising setting the electrical properties with a dielectric coating according to claim 1.