Foldable cover article with reduced hazardous projections
AssigneeSCHOTT Glass Technologies (Suzhou) Co. Ltd.
InventorsWei Xiao, Feng He, Ning Da
Life of this patent
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Abstract
A foldable cover article has a total thickness t≤300 μm, which is bendable to a minimum bending radius r≤20 mm without breakage and a pencil hardness HR≥HB. The foldable cover article includes a glass or glass-ceramic substrate with a thickness 5 μm≤t1≤150 μm and a polymer layer and/or a hard material coating with a total thickness 5 μm≤t2≤150 μm. For each 20 mm width of the foldable cover article, when the foldable cover article is broken upon bending along the direction perpendicular to the width, a number of projections with a longest linear extension L≥5 mm is less than 10 and/or a number of projections with a longest linear extension L<5 mm is less than 50.
Claims19
A foldable cover article having a total thickness t≤300 μm, which is bendable to a minimum bending radius r≤20 mm without breakage and a pencil hardness HR≥HB, and comprises:
- a glass or glass-ceramic substrate with a thickness 5 μm≤t1≤150 μm;
- and
- a polymer layer and a hard material coating with a total thickness t2 of the polymer layer and the hard material coating being 5 μm≤t2≤150 μm;
- wherein for each 20 mm width of the foldable cover article, when the foldable cover article is broken upon bending along the direction perpendicular to the width, a number of projections with a longest linear extension L≥5 mm is less than 10 and/or a number of projections with a longest linear extension L<5 mm is less than 50, wherein at least one surface of the glass or glass ceramic substrate is coated with the hard material coating or a multi-layer coating of the hard material coating having a total thickness t3c≥1 μm, and each layer of the hard material coating or the multi-layer coating of the hard material coating is made of poly(methyl methacrylate) (PMMA) with inorganic nanoparticles, wherein the polymer layer is disposed on a first side of the glass or glass-ceramic substrate and the hard material coating is exposed and disposed on a second side of the glass or glass-ceramic substrate that is opposite the first side.
A foldable cover article having a total thickness t≤300 μm, which is bendable to a minimum bending radius r≤20 mm without breakage and a pencil hardness HR≥HB, and comprises:
- a glass or glass-ceramic substrate with a thickness 5 μm≤t1≤150 μm;
- and
- a hard material coating applied to a first surface of the glass or glass-ceramic substrate, the hard material coating or a multi-layer coating of the hard material coating having a total thickness t3c≥1 μm;
- wherein for each 20 mm width of the foldable cover article, when the foldable cover article is broken upon bending along the direction perpendicular to the width, a number of projections with a longest linear extension L≥5 mm is less than 10 and/or a number of projections with a longest linear extension L<5 mm is less than 50, each layer of the hard material coating or the multi-layer coating of the hard material coating comprising poly(methyl methacrylate) (PMMA), wherein the hard material coating is an exposed material layer;
- and
- an adhesive layer applied to a second surface of the glass or glass-ceramic substrate that is opposite the first surface.
Dependencies are inferred from the claim text.