# US 2014/0193636 A1 · Heat-treatable low-emissivity glass and a production method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0193636 A1 - Document ID: US20140193636A1 - Status: Published application - Kind: A1 - Application number: 14/235,886 - Filed: 2012-08-06 - Published: 2014-07-10 - Earliest claimed: 2011-08-18 - Assignees: LG Hausys, Ltd. - Inventors: Ung Kil Kim; Dae Hoon Kwon; Youn Ki Jun - Web page: https://patentgrep.com/patent/US20140193636A1 ## CPC - C03C 17/3681: {the multilayer coating being used in glazing, e.g. windows or windscreens} - B32B 15/04: comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} - C03C 17/36: at least one coating being a metal - C03C 17/3618: {Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic} - C03C 17/3626: {one layer at least containing a nitride, oxynitride, boronitride or carbonitride} - C03C 17/3644: {the metal being silver} - C03C 17/3652: {the coating stack containing at least one sacrificial layer to protect the metal from oxidation} - C03C 17/366: {Low-emissivity or solar control coatings} - Y10T 428/265: 1 mil or less - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A low-emissivity glass which is outstandingly durable and is heat treatable without any changes in its characteristics before and after the heat treatment; and a production method therefor. The heat-treatable low-emissivity glass according to the present invention is characterized in that it comprises: a sunlight-adjusting metal layer which is formed above a glass substrate; a first dielectric layer which is formed below the sunlight-adjusting metal layer; a second dielectric layer which is formed above the sunlight-adjusting metal layer; and an uppermost protective layer which is formed above the second dielectric layer, and in that the first dielectric layer has a structure obtained by the lamination of a lowermost dielectric layer comprising a metal oxide and a lower metal protective dielectric layer comprising a metal (oxy)nitride, and an advantage of the present invention is that there is no change in the characteristics of the low-emissivity glass even after heat treatment. ## Claims ### Claim 1 A low-emissivity glass comprising: a sunlight-adjusting metal layer formed on a glass substrate; a first dielectric layer formed under the sunlight-adjusting metal layer; a second dielectric layer formed on the sunlight-adjusting metal layer; and an uppermost protective layer formed on the second dielectric layer, the first dielectric layer comprising a structure in which a lowermost dielectric layer containing a metal oxide and a lower metal protective dielectric layer containing a metal (oxy)nitride are stacked. ### Claim 2 (depends on 1) The low-emissivity glass according to claim 1, wherein the lowermost dielectric layer and the lower metal protective dielectric layer comprise the same metal. ### Claim 3 (depends on 1) The low-emissivity glass according to claim 1, wherein the lowermost dielectric layer comprises SnZnOx. ### Claim 4 (depends on 1) The low-emissivity glass according to claim 1, wherein the lower metal protective dielectric layer comprises SnZnOxNy or SnZnNx. ### Claim 5 (depends on 1) The low-emissivity glass according to claim 1, wherein the lowermost dielectric layer has a thickness of 10 nm to 50 nm. ### Claim 6 (depends on 1) The low-emissivity glass according to claim 1, wherein the lower metal protective dielectric layer has a thickness of 1 nm to 10 nm. ### Claim 7 (depends on 1) The low-emissivity glass according to claim 1, wherein the sunlight-adjusting metal layer comprises a low-emissivity layer and metal protective layers formed on and under the low-emissivity layer. ### Claim 8 (depends on 7) The low-emissivity glass according to claim 7, wherein the low-emissivity layer comprises at least one material selected from the group consisting of silver, gold, copper, aluminum and platinum. ### Claim 9 (depends on 7) The low-emissivity glass according to claim 7, wherein the metal protective layers comprise at least one material selected from the group consisting of nickel, chrome, and an alloy of nickel and chrome. ### Claim 10 (depends on 1) The low-emissivity glass according to claim 1, wherein the second dielectric layer comprises SnZnOxNy or SnZnNx. ### Claim 11 (depends on 1) The low-emissivity glass according to claim 1, wherein the uppermost protective layer comprises SnZnOx. ### Claim 12 A method of producing a low-emissivity glass, comprising: (a) forming a first dielectric layer by depositing a metal oxide on a glass substrate and depositing a metal (oxy) nitride on the deposited metal oxide; (b) forming a sunlight-adjusting metal layer on the first dielectric layer; (c) forming a second dielectric layer by depositing a metal (oxy)nitride on the sunlight-adjusting metal layer; and (d) forming an uppermost protective layer by depositing a metal oxide on the second dielectric layer. ### Claim 13 (depends on 12) The method according to claim 12, wherein the metal oxide comprises SnZnOx. ### Claim 14 (depends on 12) The method according to claim 12, wherein the metal (oxy)nitride comprises SnZnOxNy or SnZnNx. ### Claim 15 (depends on 12) The method according to claim 12, wherein the sunlight-adjusting metal layer comprises a low-emissivity layer and metal protective layers formed on and under the low-emissivity layer. ### Claim 16 (depends on 15) The method according to claim 15, wherein the low-emissivity layer comprises at least one material selected from the group consisting of silver, gold, copper, aluminum and platinum. ### Claim 17 (depends on 15) The low-emissivity glass according to claim 15, wherein the metal protective layers comprise at least one material selected from the group consisting of nickel, chrome, and an alloy of nickel and chrome.