# US 5,346,768 A · Soda-lime glass containing vanadium

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- Number: US 5,346,768 A
- Document ID: US5346768A
- Status: Granted
- Kind: A
- Application number: 07/865,075
- Filed: 1992-04-08
- Granted: 1994-09-13
- Earliest claimed: 1991-04-10
- Assignees: Flachglas Aktiengesellschaft
- Inventors: Ernst Winter; Friedrich Marwan; Joachim Bretschneider; Hubert Drexler
- Web page: https://patentgrep.com/patent/US5346768A

## CPC

- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 4/085: {for ultraviolet absorbing glass}
- Y10S 428/921: Fire or flameproofing
- Y10T 428/31504: Composite [nonstructural laminate]
- Y10T 428/31612: As silicone, silane or siloxane
- Y10T 428/31616: Next to polyester [e.g., alkyd]
- 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
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A soda-lime glass containing vanadium which can be produced by the float process with high UV absorption for wavelengths below 350 nm. The glass comprises 70 to 74 weight % SiO.sub.2, 0 to 2 weight % Al.sub.2 O.sub.3, 0.1 weight % or less Fe.sub.2 O.sub.3, 0 to 0.15 weight % TiO.sub.2, 7.5 to 10 weight % CaO, 3.5 to 5.4 weight % MgO, 12 to 15 weight % Na.sub.2 O, 0 to 1 weight % K.sub.2 O, 0 to 0.02 weight % BaO, 0.1 to 0.3 weight % SO.sub.3, 3 to 7 weight ppm CoO and 0.1 to 0.3 weight % V.sub.2 O.sub.5.

## Claims

### Claim 1

A soda-lime glass containing vanadium processable by the float process, with an UV absorption up to about 90% of the UV radiation for wavelengths of below 350 nm, comprising 70 to 74 weight % SiO.sub.2, 0 to 2 weight % Al.sub.2 O.sub.3, 0.1 weight % or less Fe.sub.2 O.sub.3, 0 to 0.15 weight % TiO.sub.2, 7.5 to 10 weight % CaO, 3.5 to 5.4 weight % MgO, 12 to 15 weight % Na.sub.2 O, 0 to 1 weight % K.sub.2 O, 0 to 0.02 weight % BaO, 0.1 to 0.3 weight % SO.sub.3, 3 to 7 ppm CoO and 0.1 to 0.3 weight % V.sub.2 O.sub.5, whereby the sum of all weight percentages is 100%.

### Claim 2 (depends on 1)

The glass according to claim 1, wherein the glass comprises 70 to 74 weight % SiO.sub.2, 0.01 to 2 weight % Al.sub.2 O.sub.3, about 0.005 to about 0.1 weight % Fe.sub.2 O.sub.3, 0.01 to 0.15 weight % TiO.sub.2, 7.5 to 10 weight % CaO, 3.5 to 5.4 weight % MgO, 12 to 15 weight % Na.sub.2 O, 0.01 to 1 weight % K.sub.2 O, 0.01 to 0.03 weight % SO.sub.3, 3 to 7 weight ppm CoO and 0.1 to 0.3 weight % V.sub.2 O.sub.5.

### Claim 3 (depends on 1)

The glass according to claim 1, wherein the TiO.sub.2 is in an amount of 0.01 to 0.15 weight %.

### Claim 4 (depends on 1)

The glass according to claim 1, wherein the K.sub.2 O is in an amount of 0.01 to 1 weight %.

### Claim 5 (depends on 1)

The glass according to claim 1, wherein the BaO is in an amount of 0.01 to 0.02 weight %.

### Claim 6 (depends on 1)

The glass according to claim 1, wherein the Al.sub.2 O.sub.3 is in an amount of 0.01 to 2 weight %.

### Claim 7 (depends on 1)

The glass according to claim 1, wherein the Fe.sub.2 O.sub.3 is in an amount of 0.005 to 0.1 weight %.

### Claim 8 (depends on 1)

The glass according to claim 1, wherein the glass comprises 72.5 to 72.7 weight % SiO.sub.2, 0.55 to 0.75 weight % Al.sub.2 O.sub.3, less than about 0.06 weight % Fe.sub.2 O.sub.3, 0 to 0.12 weight % TiO.sub.2, 8.4 to 8.8 weight % CaO, 4 to 4.44 weight % MgO, 12.9 to 13.2 weight % Na.sub.2 O, 0.2 to 0.4 weight % K.sub.2 O, 0 to 0.01 weight % BaO, 0.17 to 0.22 weight % SO.sub.3, 5 weight ppm CoO and 0.19 to 0.21 weight % V.sub.2 O.sub.5.

### Claim 9 (depends on 1)

The glass according to claim 1, wherein the glass consists essentially of 72.55 weight % SiO.sub.2, 0.63 weight % Al.sub.2 O.sub.3, 0.03 weight % Fe.sub.2 O.sub.3, 0.11 weight % TiO.sub.2, 8.67 weight % CaO, 4.32 weight % MgO, 12.99 weight % Na.sub.2 O, 0.3 weight % K.sub.2 O, 0.19 weight % SO.sub.3, 0.01 weight % BaO, 0.2 weight % V.sub.2 O.sub.5 and 5 ppm CoO.

### Claim 10 (depends on 1)

The glass according to claim 1, wherein the glass consists essentially of 72.53 weight % SiO.sub.2. 0.63 weight % Al.sub.2 O.sub.3, 0.05 weight % Fe.sub.2 O.sub.3, 0.11 weight % TiO.sub.2, 8.67 weight % CaO, 4.32 weight % MgO, 12.99 weight % Na.sub.2 O, 0.3 weight % K.sub.2 O, 0.19 weight % SO.sub.3, 0.01 weight % BaO, 0.2 weight % V.sub.2 O.sub.5 and 5 ppm CoO.

### Claim 11 (depends on 1)

The glass according to claim 1, wherein the glass consists essentially of 72.7 weight % SiO.sub.2, 0.73 weight % Al.sub.2 O.sub.3, 0.05 weight % Fe.sub.2 O.sub.3, 0.04 weight % TiO.sub.2, 8.4 weight % CaO, 4 weight % MgO, 12.9 weight % Na.sub.2 O, 0.4 weight % K.sub.2 O, 0.22 weight % SO.sub.3, 0.2 weight % V.sub.2 O.sub.5 and 5 ppm CoO.

### Claim 12 (depends on 1)

A multilayered glazing system comprising (a) at least one UV-sensitive layer of a polymer selected from the group consisting of organic polymers, inorganic polymers and combinations thereof and (b) at least one layer of a glass according to claim 1.

### Claim 13 (depends on 12)

The multilayer glazing system according to claim 12, which is fire resistant and which further comprises a fire retardant layer.

### Claim 14 (depends on 13)

The multilayer glazing system according to claim 13, wherein the fire retardant layer is interposed between two outer panes wherein at least one of said outer panes comprises said glass and wherein said fire retardant layer comprises sodium silicate.

### Claim 15 (depends on 1)

In an automobile glazing system, wherein the improvement comprises said glazing system being a multilayer glazing system comprising (a) at least one UV-sensitive layer of a polymer selected from the group consisting of organic polymers, inorganic polymers and combinations thereof and (b) at least one layer of a glass according to claim 1.

### Claim 16 (depends on 1)

The glass according to claim 1, wherein the glass comprises 71 to 73 weight % SiO.sub.2, 0.55 to 0.75 weight % Al.sub.2 O.sub.3, less than about 0.07 weight % Fe.sub.2 O.sub.3, 0 to 0.12 weight % TiO.sub.2, 8 to 9 weight % CaO, 4.0 to 4.5 weight % MgO, 12.5 to 14.0 weight % Na.sub.2 O, 0.2 to 0.4 weight % K.sub.2 O, 0 to 0.02 weight % BaO, 0.15 to 0.25 weight % SO.sub.3, 4 to 6 ppm CoO and 0.18 to 0.22 weight % V.sub.2 O.sub.5.