Title:
TITANIUM-CONTAINING QUARTZ GLASS HAVING EXCELLENT UV ABSORPTION, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/202709
Kind Code:
A1
Abstract:
Provided is a titanium-containing quartz glass having excellent UV absorption, wherein the quartz glass absorbs ultraviolet rays having a wavelength of 250 nm or less, ozone generation-related adverse effects on the human body, etc., are prevented, a decrease in transmittance of the quartz glass in the range from near-ultraviolet to visible light due to being colored when irradiated with ultraviolet rays does not occur, absorption build-up or lamp burst-inducing deformation build-up, which is caused by a structural change in the quartz glass that occurs in the range of 200-300 nm when irradiated with ultraviolet rays, is suppressed, and a decrease in transmittance at intended wavelength ranges does not occur even when exposed to ultraviolet rays. The titanium-containing quartz glass having excellent UV absorption is colorless, wherein the average concentration of titanium is 10-500 ppm, the concentration of OH group is 10-350 ppm, each elemental concentration of Al, Li, Na, K, Ca, Mg, Fe, Ni, Cu, Cr, Mo, and V is 50 ppb or less (150 ppb or less in total), and the concentration of chlorine is less than 30 ppm.
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Inventors:
SHIMADA ATSUSHI (JP)
ORIKASA KATSUHIDE (JP)
TANAKA MAKOTO (JP)
KUMATA TOMOICHI (JP)
TARUKAWA HIROMI (JP)
ORIKASA KATSUHIDE (JP)
TANAKA MAKOTO (JP)
KUMATA TOMOICHI (JP)
TARUKAWA HIROMI (JP)
Application Number:
PCT/JP2020/001510
Publication Date:
October 08, 2020
Filing Date:
January 17, 2020
Export Citation:
Assignee:
SHIN ETSU QUARTZ PROD CO LTD (JP)
HERAEUS QUARZGLAS (DE)
HERAEUS QUARZGLAS (DE)
International Classes:
C03B20/00; C03C3/06
Foreign References:
| JPH0769671A | 1995-03-14 | |||
| JP2011184210A | 2011-09-22 | |||
| JP2010013335A | 2010-01-21 | |||
| JP2012072053A | 2012-04-12 | |||
| JP2005022954A | 2005-01-27 |
Attorney, Agent or Firm:
ISHIHARA Shinsuke et al. (JP)
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