Low-emissivity transparent laminated body and building material comprising same

A low-emissivity transparent laminate comprising:

• a substrate;
• and
• a coating layer,
• wherein the coating layer has a multilayer structure comprising a low-emissivity layer, a low-emissivity protective metal layer, a first silicon nitride layer, and a dielectric layer directly on the first silicon nitride layer, stacked sequentially from the substrate,
• wherein the dielectric layer includes zinc tin oxide,
• wherein the first silicon nitride layer has a thickness from 5 nm to 20 nm, and
• wherein the coating layer further comprises at least one additional silicon nitride layer on uppermost and lowermost surfaces thereof,
• wherein the low-emissivity layer is Ag,
• wherein the low-emissivity layer has a thickness from 10 nm to 25 nm,
• wherein the low-emissivity protective metal layer is selected from alloys of Ni and Cr,
• wherein the low-emissivity protective metal layer has a thickness from 1 nm to 5 nm,
• wherein the dielectric layer has a thickness from 5 nm to 60 nm,
• wherein the substrate is a transparent substrate having a visible light transmittance from 90% to 100%,
• wherein the substrate is a glass or transparent plastic substrate, wherein the coating layer has a symmetrical structure in which the low-emissivity protective metal layer and the dielectric layer are sequentially stacked on both surfaces of the low-emissivity layer.