# US 2010/0167035 A1 · Scratch-resistant silicone coating for cooktops made of glass or glass ceramic

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- Number: US 2010/0167035 A1
- Document ID: US20100167035A1
- Status: Published application
- Kind: A1
- Application number: 12/592,973
- Filed: 2009-11-20
- Published: 2010-07-01
- Earliest claimed: 2008-11-21
- Assignees: Schott AG
- Inventors: Harald Striegler
- Web page: https://patentgrep.com/patent/US20100167035A1

## CPC

- C03C 17/3405: {with at least two coatings of organic materials (C03C17/36, C03C17/42 take precedence)}
- C03C 2217/445: Organic continuous phases
- C03C 2217/475: Inorganic materials
- C03C 2217/485: Pigments
- Y10T 428/24942: including components having same physical characteristic in differing degree
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/24975: No layer or component greater than 5 mils thick
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T 428/251: Mica
- Y10T 428/264: Up to 3 mils
- Y10T 428/30: Self-sustaining carbon mass or layer with impregnant or other layer
- Y10T 428/31612: As silicone, silane or siloxane
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A functional element, in particular a cooktop or control panel, having a flat substrate composed of or of glass or glass ceramic, in which a coating that contains a crosslinked polysiloxane is applied to the substrate. In order to improve the scratch resistance of such a coating, according to this invention, a covering layer that contains an uncrosslinked polysiloxane is applied to the coating.

## Claims

### Claim 1

A functional element, in particular a cooktop or a control panel, having a flat substrate (1) of a glass or a glass ceramic, in which a coating (2) that contains a crosslinked polysiloxane is applied to the substrate (1), the functional element comprising a covering layer (3) that contains an uncrosslinked polysiloxane applied to the coating (2).

### Claim 2 (depends on 1)

The functional element as recited in claim 1, wherein a layer thickness of the coating (2) and/or the covering layer (3) lies in a range from 10 to 50 μm.

### Claim 3 (depends on 2)

The functional element as recited in claim 2, wherein the layer thickness of the coating (2) and/or the covering layer (3) lies in a second range from 15 to 30 μm.

### Claim 4 (depends on 3)

The functional element as recited in claim 3, wherein the total layer thickness, comprising a sum of the layer thickness of the coating (2) and the covering layer (3), is at least 20 μm.

### Claim 5 (depends on 4)

The functional element as recited in claim 4, wherein the total layer thickness is in a thickness range from 25 to 65 μm, preferably from 30 to 50 μm.

### Claim 6 (depends on 5)

The functional element as recited in claim 5, wherein a coating material for the coating (2) contains a silicone resin in a form of solid or fluid polysiloxanes with methyl or phenyl groups as organic radicals and hydroxy, alkoxy, or vinyl radicals as functional groups.

### Claim 7 (depends on 6)

The functional element as recited in claim 6, wherein a percentage of functional groups is 1 to 10 wt. % and/or a molecular weight is 1000 to 6000 g/mol.

### Claim 8 (depends on 7)

The functional element as recited in claim 7, wherein the coating material for the coating (2) contains hydroxy-functional phenylpolysiloxanes with a percentage of 2 to 5 wt. % hydroxy groups and a molecular weight of 1500 to 2000 g/mol.

### Claim 9 (depends on 8)

The functional element as recited in claim 8, wherein a percentage of the silicone resin in the crosslinked coating is in a range from 40 to 70 wt. %, preferably from 50 to 60 wt. %.

### Claim 10 (depends on 9)

The functional element as recited in claim 9, wherein the coating (2) contains inorganic colored pigments, white pigments, and/or black pigments.

### Claim 11 (depends on 10)

The functional element as recited in claim 10, wherein the coating (2) contains iron oxide red pigments of hematite, iron oxide black pigments, mixed-phase pigments, zinc iron brown, chrome iron brown, iron manganese black, spinel black, TiO2 and/or ZrO2.

### Claim 12 (depends on 10)

The functional element as recited in claim 10, wherein the coating contains inorganic luster pigments.

### Claim 13 (depends on 12)

The functional element as recited in claim 12, wherein the inorganic luster pigments are coated and/or uncoated platelet-shaped pigment parts.

### Claim 14 (depends on 13)

The functional element as recited in claim 13, wherein the inorganic colored pigments, black pigments, and/or white pigments have a particle diameter of less than 20 μm, preferably less than 10μm.

### Claim 15 (depends on 13)

The functional element as recited in claim 13, wherein when platelet-shaped luster pigments are used, they have an edge length of ≦100 preferably ≦75 μm.

### Claim 16 (depends on 15)

The functional element as recited in claim 15, wherein the percentage of colored pigments and/or black pigments and/or white pigments in the crosslinked coating (2) is in a range from 20 to 40 wt. %, preferably from 24 to 36 wt. %.

### Claim 17 (depends on 16)

The functional element as recited in claim 16, wherein the coating (2) and/or the covering layer (3) each contains platelet-shaped fillers.

### Claim 18 (depends on 17)

The functional element as recited in claim 17, wherein the fillers are composed of layered silicate, including mica, kaolin, and/or talcum.

### Claim 19 (depends on 18)

The functional element as recited in claim 18, wherein the percentage of fillers in the crosslinked coating (2) lies in the range from >0 to 30 wt. %, preferably >0 to 15 wt. %.

### Claim 20 (depends on 18)

The functional element as recited in claim 18, wherein a maximum size of the layered silicate particles is in a range from 10 to 30 μm and an average particle size is 1 to 20 μm.

### Claim 21 (depends on 20)

The functional element as recited in claim 20, wherein the percentage of layer silicates in the covering layer (3) is ≦50 wt. %, preferably from 10 to 25 wt. %.

### Claim 22 (depends on 21)

The functional element as recited in claim 21, wherein the softening point or the melting point of the material of the coating (2) is ≧40° C., in particular ≧60° C.

### Claim 23 (depends on 22)

The functional element as recited in claim 22, wherein the covering layer (3) contains a solid lubricant including a graphite and/or a boron nitride.

### Claim 24 (depends on 23)

The functional element as recited in claim 23, wherein the coating (2) and the covering layer (3) are produced from the same coating material.

### Claim 25 (depends on 24)

The functional element as recited in claim 24, wherein the coating system is of the coating (2) and the covering layer (3) has a sheet resistance of ≧109 Ω/cm2.

### Claim 26 (depends on 1)

The functional element as recited in claim 1, wherein a total layer thickness, comprising a sum of the layer thickness of the coating (2) and the covering layer (3), is at least 20 μm.

### Claim 27 (depends on 1)

The functional element as recited in claim 1, wherein a coating material for the coating (2) contains a silicone resin in a form of solid or fluid polysiloxanes with methyl or phenyl groups as organic radicals and hydroxy, alkoxy, or vinyl radicals as functional groups.

### Claim 28 (depends on 6)

The functional element as recited in claim 6, wherein the coating material for the coating (2) contains hydroxy-functional phenylpolysiloxanes with a percentage of 2 to 5 wt. % hydroxy groups and a molecular weight of 1500 to 2000 g/mol.

### Claim 29 (depends on 1)

The functional element as recited in claim 1, wherein a percentage of a silicone resin in the crosslinked coating is in a range from 40 to 70 wt. %, preferably from 50 to 60 wt. %.

### Claim 30 (depends on 1)

The functional element as recited in claim 1, wherein the coating (2) contains inorganic colored pigments, white pigments, and/or black pigments.

### Claim 31 (depends on 1)

The functional element as recited in claim 1, wherein the coating contains inorganic luster pigments.

### Claim 32 (depends on 10)

The functional element as recited in claim 10, wherein the inorganic colored pigments, black pigments, and/or white pigments have a particle diameter of less than 20 μm, preferably less than 10 μm.

### Claim 33 (depends on 1)

The functional element as recited in claim 1, wherein when platelet-shaped luster pigments are used, they have an edge length of ≦100 μm, preferably ≦75μm.

### Claim 34 (depends on 1)

The functional element as recited in claim 1, wherein a percentage of colored pigments and/or black pigments and/or white pigments in the crosslinked coating (2) is in a range from 20 to 40 wt. %, preferably from 24 to 36 wt. %.

### Claim 35 (depends on 1)

The functional element as recited in claim 1, wherein the coating (2) and/or the covering layer (3) each contains platelet-shaped fillers.

### Claim 36 (depends on 17)

The functional element as recited in claim 17, wherein the percentage of fillers in the crosslinked coating (2) lies in the range from >0 to 30 wt. %, preferably >0 to 15 wt. %.

### Claim 37 (depends on 1)

The functional element as recited in claim 1, wherein a softening point or a melting point of the material of the coating (2) is ≧40° C., in particular ≧60° C.

### Claim 38 (depends on 1)

The functional element as recited in claim 1, wherein the covering layer (3) contains a solid lubricant including a graphite and/or a boron nitride.

### Claim 39 (depends on 1)

The functional element as recited in claim 1, wherein the coating (2) and the covering layer (3) are produced from a same coating material.

### Claim 40 (depends on 1)

The functional element as recited in claim 1, wherein a coating system is of the coating (2) and the covering layer (3) and has a sheet resistance of ≧109 Ω/cm2.