# US 7,612,003 B2 · Red glass, process for manufacturing red glass, and tinted bulbs and tubes obtained with such a glass

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- Number: US 7,612,003 B2
- Document ID: US7612003B2
- Status: Granted
- Kind: B2
- Application number: 11/489,723
- Filed: 2006-07-20
- Published: 2007-01-25
- Granted: 2009-11-03
- Earliest claimed: 2005-07-22
- Assignees: Vermont
- Inventors: Christian Lefevre; Francois Lepesqueux
- Web page: https://patentgrep.com/patent/US7612003B2

## CPC

- C03C 3/11: containing halogen or nitrogen
- C03C 4/02: for coloured glass
- F21S 41/125: Coloured light
- H01K 1/32: provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof
- 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
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- H01K: ELECTRIC INCANDESCENT LAMPS (details, apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps H01J; light sources using a combination of incandescent and other types of light generation H01J61/96, H05B35/00)

## Abstract

The invention relates to a bulk-tinted red glass formed from a glass batch based on a soda-lime-silica composition, to a process for manufacturing red glass and to a bulb obtained from a blank or a tube manufactured with such a glass. The batch comprises, per 100% by weight of the batch, 0.1 to 1% by weight of copper, 0.2 to 2% by weight of tin and 0.01 to 2.5% by weight of oxide of the lanthanide group and/or 0.01 to 0.5% by weight of silver in silver oxide or nitrate form.

## Claims

### Claim 1

Bulk-tinted red glass formed from a glass batch based on a soda-lime-silica composition, characterized in that said batch comprises, per 100% by weight of the batch, 0.1 to 1% by weight of copper, 0.2 to 2% by weight of tin and 0.01 to 2.5% by weight of oxides of the lanthanide group and/or 0.01 to 0.5% by weight of silver in silver oxide or nitrate form.

### Claim 2 (depends on 1)

Red glass according to claim 1, characterized in that the lanthanide is erbium or neodymium.

### Claim 3 (depends on 1)

Red glass according to claim 1, characterized in that the copper is introduced in the form of red cuprous oxide or copper protoxide Cu2O, part of the cooper also being supplied by cupric chloride.

### Claim 4 (depends on 1)

Red glass according to claim 1, characterized in that the dimensions of the copper particles range from about 10 nm to about 100 nm.

### Claim 5 (depends on 4)

Red glass according to claim 4, characterized in that the copper particle dimensions range between about 30 nm and about 70 nm.

### Claim 6 (depends on 1)

Red glass according to claim 1, characterized in that the tin is introduced in the form of stannous oxide (SnO) or in the form of stannic oxide (SnO2).

### Claim 7 (depends on 1)

Glass according to claim 1, characterized in that the batch includes reducing agents favouring the transformation of the oxide to metallic copper in an extremely finely divided state, selected from the following ingredients: pulverized coke, coal, carbon, sugar, bismuth, tartar and metal powders (regulus of antimony, zinc, aluminium).

### Claim 8

Bulk-tinted red glass based on a soda-lime composition, comprising per 100% by weight of molten glass:
SiO2:
69-75%
Na2O:
between 2 and 8%
K2O:
between 5 and 15%
B2O3:
between 0.5 and 4%
LiO2:
between 0.1 and 3%
CaO:
between 5 and 9%
MgO:
between 0.2 and 1%
Al2O3:
between 0.2 and 2%
CuO:
between 0.2 and 1.5%
SnO:
between 0.2 and 2%
Cl:
between 0.02 and 0.3%
Er2O3:
between 0.01 and 2.5%
Nd2O3:
between 0 and 2.5%
Ag2O:
between 0 and 0.5%
being understood that at least one proportion of the copper is introduced in the form of cupric chloride (CuCl2), the role of which is to help in the refining and to improve the transmission.

### Claim 9 (depends on 8)

Bulk-tinted red glass, according to claim 8 the physical properties of which are around the following:
melting point (logη = 2): 1435° C.;
working point (logη = 4): 995° C.;
softening point (logη = 7.6): 690° C.;
annealing point (logη = 13): 505° C.;
Tg (logη = 13.3): 495° C.;
Strain point (logη = 14.5): 475° C.; and
Δ120/300° C. = 93 × 10−7.

### Claim 10

Process for manufacturing a red glass from a batch based on a soda-lime-silica composition, characterized in that the following are added to the batch, per 100% by weight: 0.1 to 1% by weight of copper; 0.2 to 2% by weight of tin; and 0.01 to 2.5% by weight of lanthanide oxide and/or 0.1 to 0.5% by weight of silver in silver oxide or nitrate form.

### Claim 11 (depends on 10)

Process for manufacturing a red glass according to claim 10, characterized in that the lanthanide is erbium and/or neodymium.

### Claim 12 (depends on 10)

Process according to claim 10, characterized in that the glass after being formed is heat treated in the following manner:
the formed glass (blank or tube form) is conveyed for a predetermined time, of between about 20 minutes and about 45 minutes, through a series of at least three independent heating boxes numbered in the order of flow, between the temperature at which the glass leaves the furnace and the temperature at which the glass leaves the boxes, the temperature inside box 2 being between about 520° C. and 580° C., advantageously between about 540° C. and 565 ° C.

### Claim 13 (depends on 10)

Process for manufacturing a red glass according to claim 10, characterized in that the copper is introduced in the form of red cuprous oxide or copper protoxide Cu2O, part of the copper also being supplied by cupric chloride.

### Claim 14 (depends on 10)

Process for manufacturing a red glass according to claim 10, characterized in that the tin is introduced in the form of stannous oxide (SnO) or in the form of stannic oxide (SnO2).

### Claim 15 (depends on 1)

Bulb made of red glass for a lighting system, said bulb being obtained from a blank or a tube produced with the glass according to claim 1, for use as a brake light or indicating light for motor vehicles.