Foldable glass article including an optically transparent polymeric hard-coat and methods of making the same
A glass article including an ultra-thin glass layer and an optically transparent polymeric hard-coat layer having a pencil hardness of 8H or more bonded to the ultra-thin glass layer. The optically transparent polymer hard-coat layer may include an organic polymer material or an aliphatic or aromatic hexafunctional urethane acrylate. In some embodiments, the glass article may have an impact resistance defined by the capability of the glass article to avoid failure at a pen drop height that is 2 times or more than that of a control pen drop height of the ultra-thin glass layer without the optically transparent polymeric hard-coat layer, where the pen drop height and the control pen drop height are measured according to the Pen Drop Test. In some embodiments, the glass article may survive a bend radius of 5 mm or less.
1. A glass article, comprising:
an ultra-thin glass layer;
an optically transparent adhesive layer disposed on the ultra-thin glass layer; and
an optically transparent polymeric hard-coat layer disposed on the optically transparent adhesive layer, wherein the optically transparent polymeric hard-coat layer is a silsesquioxane polymer layer, an aliphatic hexafunctional urethane acrylate layer, or an aromatic hexafunctional urethane acrylate layer and the optically transparent polymeric hard-coat layer comprises:
a pencil hardness of 8H or more, and
a thickness in a range of 10 microns to 120 microns,
wherein the glass article comprises an impact resistance defined by the capability of the glass article to avoid failure at a pen drop height that is 2 times or more than that of a control pen drop height of the ultra-thin glass layer without the optically transparent polymeric hard-coat layer, wherein the pen drop height and the control pen drop height are measured according to the Pen Drop Test, and
wherein the glass article survives a bend radius of 5 mm or less.
2. The glass article of claim 1 , wherein the glass article is devoid of a layer disposed over the optically transparent polymeric hard-coat layer having a pencil hardness greater than that of the optically transparent polymeric hard-coat layer.
3. The glass article of claim 1 , wherein the pen drop height is 3 times or more than that of the control pen drop height of the ultra-thin glass layer without the optically transparent polymeric hard-coat layer, and wherein the glass article survives a bend radius of 3 mm or less.
4. The glass article of claim 1 , wherein the optically transparent polymeric hard-coat layer defines a topmost exterior surface of the glass article.
5. The glass article of claim 1 , wherein the optically transparent polymeric hard-coat layer comprises a thickness in a range of 80 microns to 120 microns.
6. The glass article of claim 1 , wherein the optically transparent polymeric hard-coat layer is the aliphatic or aromatic hexafunctional urethane acrylate layer comprising a thickness in a range of 10 microns to 60 microns.
7. The glass article of claim 1 , wherein the optically transparent adhesive layer comprises a thickness in a range of 5 microns to 30 microns.
8. A method of making a glass article, the method comprising:
disposing an optically transparent adhesive layer on an ultra-thin glass layer; and
disposing an optically transparent polymeric hard-coat layer on the optically transparent adhesive layer, wherein the optically transparent polymeric hard-coat layer is a silsesquioxane polymer layer, an aliphatic hexafunctional urethane acrylate layer, or an aromatic hexafunctional urethane acrylate layer and the optically transparent polymeric hard-coat layer comprises:
a pencil hardness of 8H or more, and
a thickness in a range of 10 microns to 120 microns,
wherein the glass article comprises an impact resistance defined by the capability of the glass article to avoid failure at a pen drop height that is 2 times or more than that of a control pen drop height of the ultra-thin glass layer without the optically transparent polymeric hard-coat layer, wherein the pen drop height and the control pen drop height are measured according to the Pen Drop Test, and
wherein the glass article survives a bend radius of 5 mm or less.
9. The method of claim 8 , wherein the pen drop height is 3 times or more than that of the control pen drop height of the ultra-thin glass layer without the optically transparent polymeric hard-coat layer.
10. The method of claim 8 , wherein the glass article is devoid of a layer disposed over the optically transparent polymeric hard-coat layer having a pencil hardness greater than that of the optically transparent polymeric hard-coat layer.
11. The method of claim 8 , wherein the optically transparent polymeric hard-coat layer is the aliphatic hexafunctional urethane acrylate layer, or the aromatic hexafunctional urethane acrylate layer.