US 7,468,148 B2
Visible polarizing glass and process
Nicholas Francis Borrelli, Elmira, N.Y. (US); George Bigelow Hares, Corning, N.Y. (US); David John McEnroe, Corning, N.Y. (US); and Joseph Francis Schroeder, III, Corning, N.Y. (US)
Assigned to Corning Incorporated, Corning, N.Y. (US)
Filed on Oct. 24, 2005, as Appl. No. 11/257,968.
Prior Publication US 2007/0093373 A1, Apr. 26, 2007
This patent is subject to a terminal disclaimer.
Int. Cl. H01B 1/00 (2006.01); G02B 5/30 (2006.01)
U.S. Cl. 252—500  [65/30.1; 65/30.11; 359/486; 359/591; 430/13; 501/13; 501/32; 501/66] 6 Claims
 
1. A aluminoborosilicate glass composition suitable for making optical polarizers, said glass comprising:
(a) an aluminoborosilicate base glass composition comprising in wt. %:
   
  SiO2 20-60
  Al2O3  5-20
  B2O3 10-25
  Ag 15-40
   
and
(b) a noble metal selected from the group consisting of platinum, palladium, gold, iridium, rhodium and ruthenium,
wherein said noble metal is present in the final composition in an amount in the range of 0.0025 to 0.5 wt. %; and
wherein said aluminoborosilicate glass contains colloidal silver particles.