US 12,252,439 B2
Tube-drawable glass, method for the production and use
Malte Grimm, Mitterteich (DE); Rainer Erwin Eichholz, Frankfurt am Main (DE); and Ralf Biertümpfel, Mainz-Kastel (DE)
Assigned to Schott AG, Mainz (DE)
Filed by Schott AG, Mainz (DE)
Filed on Dec. 18, 2020, as Appl. No. 17/127,396.
Claims priority of application No. 19401057 (EP), filed on Dec. 20, 2019; and application No. 10 2020 122 220.3 (DE), filed on Aug. 25, 2020.
Prior Publication US 2021/0188696 A1, Jun. 24, 2021
Int. Cl. C03C 3/076 (2006.01); C03C 3/083 (2006.01); C03C 3/085 (2006.01); C03C 3/091 (2006.01); C03C 3/093 (2006.01); C03C 4/02 (2006.01); C03C 4/10 (2006.01); C03C 21/00 (2006.01); G01S 7/481 (2006.01); G01S 17/931 (2020.01); G02B 5/20 (2006.01); G02B 5/22 (2006.01)
CPC C03C 3/076 (2013.01) [C03C 3/083 (2013.01); C03C 3/085 (2013.01); C03C 3/091 (2013.01); C03C 3/093 (2013.01); C03C 4/02 (2013.01); C03C 4/10 (2013.01); C03C 21/002 (2013.01); C03C 2203/10 (2013.01); C03C 2203/50 (2013.01); G01S 7/4813 (2013.01); G01S 17/931 (2020.01); G02B 5/208 (2013.01); G02B 5/226 (2013.01)] 11 Claims
 
1. A glass, having a maximum crystallization rate (KGmax) of at most 0.20 μm/min in a temperature range of 700° C. to 1250° C. and a hydrolytic stability according to a hydrolytic class 1 HGA1 according to ISO 720:1985, wherein in the case of a sample thickness of 2 mm of the glass a ratio of a minimum transmittance in a wavelength range of 850 nm to 950 nm to a maximum transmittance in a wavelength range of 250 nm to 700 nm is in a range of 1.9:1 to 15:1, wherein the glass comprises cations of the following components in the given portions (in % by cation):
 
 
 
 Component Portion
 
 
 
 silicon 40-80
 
 boron  0-20
 
 aluminum  0-25
 
 sodium  2-22
 
 potassium 0.1-10 
 
 chromium 0.05-0.5 
 
 cobalt 0.03-0.5;
 
 
wherein a sum of the portions of the cations of sodium and potassium is in a range of 10 to 25% by cation, wherein a sum of the portions of the cations of chromium and cobalt is in a range of 0.15 to 0.55% by cation, and wherein a sum of the portions of the cations of magnesium, calcium, strontium, barium and zinc is at most 15% by cation, wherein a ratio of the sum of the portions of the cations of sodium and potassium to the sum of the portions of the cations of cobalt and chromium is in a range of 40:1 to 150:1.