Method of manufacturing laminated glass articles with improved edge condition
A method of manufacturing a laminated glass article having a first clad layer, a second clad layer, and a core layer between the first clad layer and the second clad layer, by exposing an edge of the core layer. An etchant can be applied to the edge of the laminated glass article to form the recess. The recess can then be filled.
1. A method of manufacturing a laminated glass article comprising a glass first clad layer, a glass second clad layer, a glass core layer between the first clad layer and the second clad layer, and an edge, each of the first clad layer and the second clad layer fused to the core layer, the method comprising:
applying an etchant to the edge of the laminated glass article, the core layer exposed at the edge;
forming a recess in the edge of the laminated glass article by removing at least a portion of the core layer with the etchant, wherein the recess spans between the first clad layer and the second clad layer; and
filling the recess with a polymer filler material.
2. The method of claim 1 , wherein the etchant etches the core layer faster than the first clad layer and the second clad layer.
3. The method of claim 1 , wherein the core layer is at least about 5 times more soluble in the etchant than the first clad layer and the second clad layer.
4. The method of claim 1 , wherein a thickness of the laminated glass article is about 4 mm or less and a thickness of each of the first clad layer and the second clad layer is from about 10 μm to about 200 μm.
5. The method of claim 1 , wherein the core layer has a coefficient of thermal expansion the same as or higher than a coefficient of thermal expansion of each of the first clad layer and the second clad layer.
6. The method of claim 1 , wherein an etch rate of the first clad layer and the second clad layer is from about 0.10 μm/min to about 1.00 μm/min, and an etch rate of the core layer is from about 2.00 μm/min to about 5.00 μm/min.
7. The method of claim 1 , wherein the etchant comprises hydrofluoric acid, hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, ammonium bifluoride, or mixtures thereof.
8. The method of claim 1 , wherein the polymer filler material comprises a polymer selected from the group consisting of 2-part epoxies, 2-part urethanes, 2-part acrylics, 2-part silicones, moisture-cure urethanes, moisture-cure epoxies, phenolics, novolacs, urea formaldehyde, melamine formaldehyde, crosslinking acrylics, crosslinking vinyls, alkyds, unsaturated polyesters, polyimides, and polyamides.
9. The method of claim 1 , wherein the filling step comprises:
applying a liquid pre-polymeric material to the at least one edge of the laminated glass article; and
curing the liquid pre-polymeric material to form a protective polymeric layer.
10. The method of claim 9 , wherein the curing step comprises photo curing or electron beam curing.
11. The method of claim 9 , wherein the pre-polymeric material is a material selected from the group consisting of a free radical addition polymerizable pre-polymeric material, a free radical step growth polymerizable pre-polymeric material, and a cationic addition polymerizable pre-polymeric material.
12. The method of claim 9 , wherein the pre-polymeric material comprises at least one additive selected from the group consisting of silica, alumina, quartz, cristobalite, silanes, zirconates, titanates, and acid functional materials.