US 11,899,228 B2
Process for obtaining a decorative mirror
Juliette Maria, Compiègne (FR); and Alexia Yon, Chantilly (FR)
Assigned to SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
Appl. No. 17/262,951
Filed by SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
PCT Filed Jul. 12, 2019, PCT No. PCT/EP2019/068864
§ 371(c)(1), (2) Date Jan. 25, 2021,
PCT Pub. No. WO2020/020671, PCT Pub. Date Jan. 30, 2020.
Claims priority of application No. 1856944 (FR), filed on Jul. 26, 2018.
Prior Publication US 2021/0165140 A1, Jun. 3, 2021
Int. Cl. G02B 5/08 (2006.01); C03C 17/36 (2006.01); G02B 5/28 (2006.01)
CPC G02B 5/0875 (2013.01) [C03C 17/3626 (2013.01); C03C 17/3649 (2013.01); C03C 17/3663 (2013.01); C03C 17/3684 (2013.01); G02B 5/0825 (2013.01); G02B 5/285 (2013.01); C03C 2217/26 (2013.01); C03C 2217/281 (2013.01); C03C 2217/78 (2013.01); C03C 2218/119 (2013.01); C03C 2218/156 (2013.01); C03C 2218/31 (2013.01); C03C 2218/328 (2013.01)] 12 Claims
 
1. A process for obtaining a decorative mirror comprising reflective regions forming a pattern and non-reflective regions, said process comprising:
providing a sheet of soda-lime-silica glass coated with a reflective coating on the entirety of one of the faces thereof, then
applying a composition comprising a phosphate salt to said reflective coating coated on the glass sheet, solely in application regions, said application regions being intended to become the non-reflective regions, then
after applying said composition, tempering said glass sheet in a tempering furnace, in which said glass sheet is subjected to a temperature of at least 550° C., said composition comprising a phosphate salt completely dissolving the reflective coating in the application regions during said tempering in the tempering furnace so as to form, after said tempering, said non-reflective regions in which the glass sheet is not coated and a tempered glass sheet comprising said reflective regions and said non-reflective regions,
wherein the reflective coating comprises at least one functional layer that is a metal layer or a layer of a metal nitride, or
wherein the reflective coating is an alternating stack of thin high-refractive-index dielectric layers and of thin low-refractive-index dielectric layers.