# US 5,704,958 A · Process for the treatment of a glass to reduce its wettability by gallium and an apparatus produced from such a treated glass

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- Number: US 5,704,958 A
- Document ID: US5704958A
- Status: Granted
- Kind: A
- Application number: 08/592,275
- Filed: 1996-01-26
- Granted: 1998-01-06
- Earliest claimed: 1995-01-30
- Assignees: Rhone-Poulenc Chimie
- Inventors: Hubert Lauvray; Jean-Charles Maurice; Jean-Louis Sabot
- Web page: https://patentgrep.com/patent/US5704958A

## CPC

- C03C 17/30: with silicon-containing compounds
- 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

## Abstract

A process for the treatment of a glass to reduce or remove its wettability by gallium is provided, wherein the glass is treated with a silyling agent. Also is provided an apparatus comprising at least one hollow element containing a gallium or gallium based alloy or in which a gallium or gallium based alloy can circulate, wherein the glass forming the hollow element has been treated using the process. The apparatus may be thermometer, barometer or electric switch.

## Claims

### Claim 1

A process for the treatment of a glass to reduce or remove its wettability by gallium or a gallium based alloy, comprising the steps of treating the glass with a silyling agent.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the glass is treated by soaking it in a solution containing a silyling agent.

### Claim 3

An apparatus comprising at least one hollow glass element which delimits a space containing gallium or a gallium based alloy, wherein the glass forming the hollow element has been treated with a silyling agent.

### Claim 4 (depends on 3)

The apparatus according to claim 3, wherein the hollow element further contains an atmosphere of an inert gas.

### Claim 5 (depends on 3)

The apparatus according to claim 3 in the form of a thermometer, barometer or electric switch.

### Claim 6 (depends on 1)

The process according to claim 1, wherein the silyling agent is N,O-bis(trimethylsilyl)acetimide, N-methyl-N-trimethylsilyltrifluoroacetamide or N-trimethylsilylacetamide.

### Claim 7 (depends on 1)

The process according to claim 1, further comprising the step of drying said glass.

### Claim 8 (depends on 7)

The process according to claim 7, wherein said drying is carried out at a temperature in the range of 60.degree. C. to 120.degree. C.