Ultraviolet absorbing glass and articles thereof

Patent metadata

Field	Value
Publication number	US-9938182-B2
Application number	US-201615043711-A
Country	US
Kind code	B2
Filing date	Feb 15, 2016
Priority date	Mar 2, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Disclosed herein are ultraviolet absorbing glasses. The glasses can be strengthened by a chemical tempering process and maintain good mechanical and optical properties while having a reduced thickness compared to conventional glasses. The ultraviolet absorbing glasses can include coloring agents and can be formed into ophthalmic lenses. Methods of making and using the ultraviolet absorbing glasses are also described.

First claim

What is claimed is:

1. An ultraviolet absorbing glass comprising (a) a base glass composition comprising in weight percent:

SiO 2
50-60

B 2 O 3
17.5-22.0

Al 2 O 3
6.5-8.0

Li 2 O
3.5-5.5

Na 2 O
0.5-7.5

K 2 O
0.5-7.5

ZrO 2
2.0-7.0

TiO 2
  0-2.0

and (b) an ultraviolet component comprising (i) copper oxide and (ii) a chloride source, a bromide source, or a combination thereof, wherein the amount of copper oxide is from 0.25 to 1.5 parts by weight per 100 parts by weight base composition; and the sum of the chloride derived from the chloride source, the bromide derived from the bromide source, or a combination thereof is from 0.2 to 4.0 parts by weight per 100 parts by weight base composition.

2. The glass of claim 1 , wherein the base glass composition comprises in weight percent:

SiO 2
54.0-58.0

B 2 O 3
19.0-21.0

Al 2 O 3
7.0-8.0

Li 2 O
4.0-5.0

Na 2 O
0.5-1.0

K 2 O
6.0-7.0

ZrO 2
4.0-5.0

TiO 2
 0.5-1.5.

3. The glass of claim 1 , wherein the base glass composition comprises in weight percent:

SiO 2
55.0-57.0

B 2 O 3
20.0-21.0

Al 2 O 3
7.0-8.0

Li 2 O
4.0-5.0

Na 2 O
4.0-5.0

K 2 O
0.5-1.5

ZrO 2
4.0-5.0

TiO 2
 0.5-1.5.

4. The glass of claim 1 , wherein the molar ratio of Li 2 O to (Na 2 O+K 2 O), expressed in cationic percent, is greater than or equal to 1.

5. The glass of claim 1 , wherein the amount of copper oxide is from 0.5 to 1.0 parts by weight per 100 parts by weight base composition and the bromide derived from the bromide source is from 2.0 to 4.0 parts by weight per 100 parts by weight base composition.

6. The glass of claim 1 , wherein the chloride source is NaCl or KCl and the bromide source is NaBr or KBr.

7. The glass of claim 1 , wherein the ultraviolet absorbing glass further comprises one or more coloring agents.

8. The glass of claim 7 , wherein the coloring agent comprises NiO, CoO, Fe 2 O 3 , Cr 2 O 3 , MnO 2 , a rare earth metal oxide, or any combination thereof.

9. The glass of claim 8 , wherein
the amount of NiO is less than or equal to 2.5 parts by weight per 100 parts by weight base composition;
the amount of CoO is less than or equal to 2.5 parts by weight per 100 parts by weight base composition;
the amount of Fe 2 O 3 is less than or equal to 6.0 parts by weight per 100 parts by weight base composition;
the amount of Cr 2 O 3 is less than or equal to 2.0 parts by weight per 100 parts by weight base composition;
the amount of MnO 2 is less than or equal to 4.0 parts by weight per 100 parts by weight base composition; and
the amount of the rare earth metal oxide is less than or equal to 6.0 parts by weight per 100 parts by weight base composition.

10. The glass of claim 1 , wherein the ultraviolet absorbing glass is prepared from a batch composition that does not include elemental silver, a silver salt, or a combination thereof.

11. The glass of claim 1 , wherein the ultraviolet absorbing glass has a transmission of less than or equal to 1%/mm at 400 nm.

12. The glass of claim 1 , wherein the ultraviolet absorbing glass has a mean modulus of rupture strength greater or equal to 40,000 psi (≈275 MPa) and mean depth-of-compression (DOL) greater than or equal to 2.5 mil (≈63 μm) after immersion in a molten salt bath consisting of 60 wt % of KNO 3 and 40 wt % of NaNO 3 for 16 hours at 400° C.

13. A glass article comprising the ultraviolet absorbing glass of claim 1 .

14. The article of claim 13 , wherein the article comprises an ophthalmic lens.

15. The article of claim 14 , wherein the ophthalmic lens is a lens for sunglasses.

16. The article of claim 14 , wherein the lens has a thickness of 1 mm to less than 2 mm.

17. The article of claim 14 , wherein the lens has a thickness of 1.2 mm to 1.6 mm.

Assignees

• Corning Inc

Inventors

• Brocheton Yves Andre Henri

Classifications

• G02C7/10

  Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses · CPC title

• C03C3/11 Primary

  containing halogen or nitrogen · CPC title

• C03C2214/08

  Metals · CPC title

• C03C14/006

  the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material · CPC title

• C03C4/085 Primary

  for ultraviolet absorbing glass · CPC title