Dielectric Coatings and Articles

A product and dielectric technology, applied in the field of dielectric coating and products

Inactive Publication Date: 2018-07-10
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, for certain applications of partially conductive coatings, e.g. for potential control in electronic devices, specific highly resistive layers (partially conductive layers) are necessary, resistance fluctuations or even irreversible changes due to the action of electric fields are intolerable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0089] 100 g of ground and classified natural mica with a particle size 4 solution, HCl and 35 wt% aqueous SbCl 3 The solution was added dropwise to the suspension. The pH is kept constant by simultaneous regulated metered addition of sodium hydroxide solution. After all the amount of solution had been added, stirring was continued at 75° C. for another 30 min, followed by cooling to room temperature with stirring and neutralizing the reaction mixture. The pigment obtained is filtered through a suction filter, washed with water, dried at 140° C. and fired at 800° C. for 30 min. Depending on the antimony content, 178 g of a grayish to ocher-yellow pigment powder (approximately 99% of theory) were obtained. In tests 1-4, the powder resistance of the pigments was varied by varying the antimony content in the tin oxide, as shown in Table 1.

[0090] To measure the resistivity of the pigment powder, an amount of 0.5 to 3 g of the pigment is introduced into an acrylic glass tube ...

Embodiment 5

[0096] Example 5 : Preparation of partially conductive paint films

[0097] Paint films with different pigment volume concentrations were produced with the pigments (B1-B4) from Examples 1-4. For this purpose, the pigments are dispersed in the aforementioned nitro lacquer. The varnish thus obtained was applied to a glass plate using a film stretcher with a chamber knife. The layer thickness of the dry film was 50 μm. Paint films with different pigment volume concentrations are produced by dispersing in different amounts of pigment.

[0098] The coated glass panes were air-dried in the dark and tempered at 40% humidity. 3 pairs of electrodes with a length of 10 cm were applied to the coating at 1 cm intervals using Silberleitlack 5900 from the Busch company and copper foil. With an operating voltage of 1000 V, the resistance Ro between the electrodes was measured after 8 hours, 24 hours and 48 hours using a Metriso 5000D-PI model tera-ohmmeter. Measured with 100V operati...

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Abstract

The present invention relates to dielectric coatings and articles having a high but precisely defined surface resistivity.

Description

technical field [0001] The present invention relates to dielectric coatings and articles having a high but well-defined surface resistivity. Background technique [0002] In many applications with dielectric coatings or with articles consisting primarily of dielectric materials, such as plastic parts, films or tapes, it is necessary to specifically modify the electrical properties of the material. This is usually done by using suitable additives with corresponding properties, such as fillers or pigments. [0003] It is therefore known to significantly increase the conductivity of layers of dielectric binders, for example by adding conductive pigments. [0004] Conductive pigments are currently used in various fields of application, for example for antistatic coatings, antistatic floor coverings, antistatic treatment of explosion-proof rooms or as conductive primers for painting plastics. [0005] In these applications, low surface resistance and volume resistance are neces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/18H01B3/00C08K3/013C09D101/18C09D7/41C09D7/61C09D5/24
CPCC09D101/18H01B3/004H01B3/185C09D7/41C09D7/61Y10T428/257Y10T428/251Y10T428/256C09D5/24C08K3/013H01B3/18H02K3/40
Inventor R·吕格尔M·昆茨
Owner MERCK PATENT GMBH
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