US2018016183A1PendingUtilityA1
Dimensionally stable fast etching glasses
Est. expiryOct 31, 2034(~8.3 yrs left)· nominal 20-yr term from priority
C03C 3/091C03C 3/093C03C 3/087Y02P40/57G02F 1/133302C03C 4/00C03B 17/064C03C 3/085
63
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Claims
Abstract
Substantially alkali free glasses are disclosed with can be used to produce substrates for flat panel display devices, e.g., active-matrix liquid crystal displays (AMLCDs). The glasses have high annealing temperatures and etch rates. Methods for producing substantially alkali free glasses using a downdraw process (e.g., a fusion process) are also disclosed.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A glass comprising:
an annealing temperature greater than or equal to about 785° C.; a Young's modulus greater than or equal to about 81 GPa; a T 200P less than or equal to about 1750° C.; a T 35kP less than or equal to about 1340° C.; an average surface roughness as measured by atomic force microscopy of less than 0.5 nm; and wherein the glass comprises in mole percent on an oxide basis less than or equal to 2.0 mole percent of the individual concentration of TiO 2 , MnO, Fe 2 O 3 , ZnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , Y 2 O 3 , La 2 O 3 , CeO 2 , ZrO 2 , HfO 2 , In 2 O 3 , Ga 2 O 3 , Bi 2 O 3 , GeO 2 , PbO, SeO 3 , TeO 2 , and Gd 2 O 3 .
2 . The glass of claim 1 , wherein the glass comprises greater than zero but less than or equal to 5.0 mole percent of the combined concentration of TiO 2 , MnO, Fe 2 O 3 , ZnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , Y 2 O 3 , La 2 O 3 and CeO 2 .
3 . The glass of claim 1 , wherein the density is less than or equal to about 2.7 g/cc and the specific modulus is less than about 34.
4 . The glass of claim 3 , wherein the specific modulus is between 30 and 34.
5 . The glass of claim 2 , wherein (MgO+CaO+SrO+BaO)/Al 2 O 3 is in the range of about 1.0 and 1.6.
6 . The glass of claim 1 , wherein the T 200P less than or equal to about 700° C.
7 . The glass of claim 1 , wherein the T 35kP less than or equal to about 1310° C.
8 . The glass of claim 1 , wherein the glass is substantially free of alkalis.
9 . A liquid crystal display substrate comprising the glass of claim 1 .
10 . A glass comprising in mole percent on an oxide basis:
SiO 2 60-80; Al 2 O 3 5-20; B 2 O 3 0-10; MgO 0-20; CaO 0-20; SrO 0-20; BaO 0-20; ZnO 0-20; and wherein the glass comprises in mole percent on an oxide basis less than or equal to 2.0 mole percent of the individual concentration of TiO 2 , MnO, Fe 2 O 3 , ZnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , Y 2 O 3 , La 2 O 3 , CeO 2 , ZrO 7 , HfO 2 , In 2 O 3 , Ga 2 O 3 , Bi 2 O 3 , GeO 2 , PbO, SeO 3 , TeO 2 , and Gd 2 O 3 .
11 . The glass of claim 10 , wherein the glass comprises greater than zero but less than or equal to 5.0 mole percent of the combined concentration of TiO 2 , MnO, Fe 2 O 3 , ZnO, Nb 2 O 5 , MoO 3 , Ta 2 O 5 , WO 3 , Y 2 O 3 , La 2 O 3 and CeO 2 .
12 . The glass of claim 10 , wherein the density is less than or equal to about 2.7 g/cc and the specific modulus is less than about 34.
13 . The glass of claim 10 , wherein the specific modulus is between 30 and 34.
14 . The glass of claim 10 , wherein (MgO+CaO+SrO+BaO)/Al 2 O 3 is in the range of about 1.0 and 1.6.
15 . The glass of claim 10 , wherein the T 200P less than or equal to about 1700° C.
16 . The glass of claim 10 , wherein the T 35kP less than or equal to about 1310° C.
17 . The glass of claim 10 , wherein (MgO+CaO+SrO+BaO)/Al 2 O 3 is in the range of about 1.0 and 1.6, T(ann)>785° C., density <2.7 g/cc, T(200P)<1750° C., T(35 kP)<1340° C., Young's modulus >81 GPa.
18 . The glass of claim 10 , wherein the glass is substantially free of alkalis.
19 . A liquid crystal display substrate comprising the glass of claim 10 .Join the waitlist — get patent alerts
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