Patent ID: 11951713
Assignee: CORNING INCORPORATED
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. An article comprising:
an outer ply comprising a borosilicate glass and having a thickness of at least 200 μm and no more than 1 cm,
wherein in terms of constituent oxides, composition of the borosilicate glass comprises: SiO2, B2O3, Al2O3, one or more alkali metal oxides, one or more divalent cation oxides selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO,
greater than or equal to 11 mol % and less than or equal to 16 mol % B2O3,
greater than or equal to 0.03 mol % and less than or equal to 0.5 mol % Fe2O3,
greater than or equal to 2 mol % and less than or equal to 6 mol % Al2O3, and
a total amount of Na2O, K2O, MgO, and CaO that is greater than or equal to 7.0 mol %,
wherein the borosilicate glass comprises an annealing point that is greater than or equal to 520° and less than or equal to 590°,
wherein concentrations in mole percent on an oxide basis of SiO2, B2O3, the one or more alkali metal oxides, Al2O3, and the one or more alkaline earth metal oxides, satisfy the relationships:

(R2O+R′O)≥Al2O3,

0.80<(1−[(2R2O+2R′O)/(SiO2+2Al2O3+2B2O3)])<0.93,, where R2O is the sum of the concentrations of the one or more alkali metal oxides and R′O is the sum of the concentrations of the one or more alkaline earth metal oxides;
an inner ply comprising a second glass that is different from the composition of the borosilicate glass of the outer ply, wherein the inner ply reinforces the outer ply, stiffening the outer ply to bending forces applied thereto, and
wherein composition of the second glass is selected from the group consisting of a soda lime silicate glass composition, an aluminosilicate glass composition, an alkali aluminosilicate glass composition, an alkali containing borosilicate glass composition, an alkali aluminophosphosilicate glass composition, and an alkali aluminoborosilicate glass composition;
an interlayer coupling the inner and outer plies, wherein the interlayer is polymeric and dampens transmission of cracks from the outer ply to the inner ply.