EP0233003A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coated glass
Assignee: Pilkington Group Ltd
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Filing: 1987-01-23
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Granted: —
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Expires: 2007-01-23
Abstract
Abstract Bent and/or toughened silver coated glass having high light transmission and low emissivity is produced by depositing layers of additional metal over, or both under and over, the silver layer. When the additional metal is used over the silver layer, it is selected from aluminium, titanium, zinc and tantalum. When the additional metal is used both under and over the silver, it is selected from aluminium, titanium, zinc, tantalum and zirconium. The additional metal is used in an amount such that the light transmission of the coated glass increases on bending and/or toughening. The bent and/or toughened coated glass is useful for architectural glazing and as vehicle windows.
Inventors
- 👤 Peter Chesworth
- 👤 Martin Lowe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 20:13
CPC Classifications
C; C03; C03C; C03C21/00; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3615; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10165; B32B17/10174; C03C17/3618; C03C17/3644; C03C17/3647; C03C17/3652; C03C17/3681; C03C17/3689
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
97 words
A process for the production of a bent and/or toughened silver coated glass substrate which comprises subjecting a glass substrate with a coating comprising a silver layer 5 nm to 30 nm thick, a layer of additional metal selected from aluminium, titanium, zinc and tantalum over the silver layer, and an anti-reflection metal oxide layer over said layer of addition metal to a bending and/or toughening cycle in which it is heated to a temperature above the softening point of the glass, whereby the coated glass develops an increased light transmission during the bending and/or toughening cycle.
Claim 2
Dependent Claim
97 words
A process for the production of a bent and/or toughened silver coated glass substrate which comprises subjecting a glass substrate with a coating comprising a silver layer 5 nm to 30 nm thick, a layer of additional metal selected from aluminium, titanium, zinc and tantalum over the silver layer, and an anti-reflection metal oxide layer over said layer of addition metal to a bending and/or toughening cycle in which it is heated to a temperature above the softening point of the glass, whereby the coated glass develops an increased light transmission during the bending and/or toughening cycle.
Claim 3
Dependent Claim
122 words
A process for the production of a bent and/or toughened silver coated glass substrate which comprises subjecting a glass substrate with a coating comprising a layer of additional metal selected from aluminium, titanium, zinc, tantalum and zirconium over the substrate, a silver layer 5 nm to 30 nm thick over said layer of additional metal, a further layer of additional metal selected from aluminium, titanium, zinc, tantalum and zirconium over the silver layer, and an anti-reflection metal oxide layer over said further layer of additional metal to a bending and/or toughening cycle in which it is heated to a temperature above the softening point of the glass, whereby the coated glass develops an increased light transmission during the bending and/or toughening cycle.
Claim 4
Dependent Claim
122 words
A process for the production of a bent and/or toughened silver coated glass substrate which comprises subjecting a glass substrate with a coating comprising a layer of additional metal selected from aluminium, titanium, zinc, tantalum and zirconium over the substrate, a silver layer 5 nm to 30 nm thick over said layer of additional metal, a further layer of additional metal selected from aluminium, titanium, zinc, tantalum and zirconium over the silver layer, and an anti-reflection metal oxide layer over said further layer of additional metal to a bending and/or toughening cycle in which it is heated to a temperature above the softening point of the glass, whereby the coated glass develops an increased light transmission during the bending and/or toughening cycle.
Claim 5
Dependent Claim
28 words
A process according to claim 1 or claim 2 wherein the coated glass develops an increased light transmission of at least 70% during the bending and/or toughening cycle.
Claim 6
Dependent Claim
37 words
A process according to any one of the preceding claims wherein the coated glass develops an increased light transmission of at least 80% of the light transmission of the uncoated glass during the bending and/or toughening cycle.
Claim 7
Dependent Claim
45 words
A process according to any of the preceding claims which comprises heating a coated soda lime silica glass substrate in air at a temperature in the range 570°C to 620°C, allowing it to sag in a mold of desired curvature, and annealing the bent glass.
Claim 8
Dependent Claim
43 words
A process according to any of claims 1 to 4 which comprises heating a coated soda lime silica glass substrate in air at a temperature in the range 600°C to 670°C, optionally bending the glass and rapidly cooling the glass to toughen it.
Claim 9
Dependent Claim
19 words
A process according to claim 6 wherein the glass is rapidly cooled by blowing air onto the glass surface.
Claim 10
Dependent Claim
54 words
A process according to any of the preceding claims wherein the amount of additional metal used is regulated in accordance with the temperature to which the glass is heated and the duration of the heating cycle employed in the bending and/or toughening cycle, to maximise the light transmission of the toughened and/or bent product.
Claim 11
Dependent Claim
41 words
A process according to any of the preceding claims wherein the total amount of said additional metal present is such that the light transmission of the coated glass increases by at least 10% of its original value on bending and/or toughening.
Claim 12
Dependent Claim
35 words
A process according to any of the preceding claims wherein the total amount of additional metal is sufficient to provide a single metal layer having a thickness in the range 4 nm to 15 nm.
Claim 13
Dependent Claim
25 words
A process according to any of claims 1 and 3 to 10 as dependent on claim 1 wherein the additional metal is aluminium or zinc.
Claim 14
Dependent Claim
26 words
A process according to any of claims 2 and 3 to 10 as dependent on claim 1 wherein the additional metal is aluminium, zinc or titanium.
Claim 15
Dependent Claim
28 words
A process according to any of the preceding claims wherein the additional metal is aluminium in an amount equivalent to a layer 5 nm to 10 nm thick.
Claim 16
Dependent Claim
22 words
A process according to any of the preceding claims wherein the silver layer has a thickness of 5 nm to 20 nm.
Claim 17
Dependent Claim
36 words
A process according to any of the preceding claims wherein the total thickness of any metal oxide layers overlying the silver layer after bending and/or toughening of the glass is from 20 nm to 60 nm.
Claim 18
Dependent Claim
26 words
A process according to any of the preceding claims wherein a layer or layers of metal oxide is provided between the glass and the silver layer.
Claim 19
Dependent Claim
28 words
A process according to claim 16 wherein the total thickness of any oxide layers between the glass and the silver layer is from 20 nm to 60 nm.
Claim 20
Dependent Claim
78 words
A coated glass substrate with a coating comprising a silver layer 5 nm to 30 nm thick, a layer of additional metal selected from aluminium, titanium, zinc and tantalum over the silver layer, and an anti-reflection metal oxide layer over said additional metal which coated glass substrate, when subjected to a bending and/or toughening cycle in which the glass is heated in air to a temperature above the softening temperature of the glass, develops an increased light transmission.
Claim 21
Dependent Claim
78 words
A coated glass substrate with a coating comprising a silver layer 5 nm to 30 nm thick, a layer of additional metal selected from aluminium, titanium, zinc and tantalum over the silver layer, and an anti-reflection metal oxide layer over said additional metal which coated glass substrate, when subjected to a bending and/or toughening cycle in which the glass is heated in air to a temperature above the softening temperature of the glass, develops an increased light transmission.
Claim 22
Dependent Claim
102 words
A coated glass substrate with a coating comprising a layer of additional metal selected from aluminium, titanium, zinc, tantalum and zirconium, a silver layer 5 nm to 30 nm thick over the layer of additional metal, a further layer of additional metal selected from aluminium, titanium, zinc, tantalum and zirconium over the silver layer, and an anti-reflection metal oxide layer over said further layer of additional metal which coated glass substrate, when subjected to a bending and/or toughening cycle in which the glass is heated in air to a temperature above the softening temperature of the glass, develops an increased light transmission.
Claim 23
Dependent Claim
102 words
A coated glass substrate with a coating comprising a layer of additional metal selected from aluminium, titanium, zinc, tantalum and zirconium, a silver layer 5 nm to 30 nm thick over the layer of additional metal, a further layer of additional metal selected from aluminium, titanium, zinc, tantalum and zirconium over the silver layer, and an anti-reflection metal oxide layer over said further layer of additional metal which coated glass substrate, when subjected to a bending and/or toughening cycle in which the glass is heated in air to a temperature above the softening temperature of the glass, develops an increased light transmission.
Claim 24
Dependent Claim
27 words
A coated glass substrate according to claim 18 or claim 19 which develops an increased light transmission of at least 70% during the bending and/or toughening cycle.
Claim 25
Dependent Claim
36 words
A coated glass substrate according to any of claims 18 to 20 which develops an increased light transmission of at least 80% of the light transmission of the base glass during the bending and/or toughening cycle.
Claim 26
Dependent Claim
46 words
A coated glass substrate according to any of claims 18 to 21 wherein the total amount of said additional metal present is such that the light transmission of the coated glass increases by at least 10% of its original value on bending and/or toughening in air.
Claim 27
Dependent Claim
38 words
A coated glass substrate according to any of claims 18 to 22 wherein the total amount of additional metal is sufficient to provide a single metal layer having a thickness in the range 4 nm to 15 nm.
Claim 28
Dependent Claim
27 words
A coated glass substrate according to any of claims 18 and 20 to 23 as dependent on claim 18 wherein the additional metal is aluminium or zinc.
Claim 29
Dependent Claim
28 words
A coated glass substrate according to any of claims 19 and 20 to 23 as dependent on claim 19 wherein the additional metal is aluminium, zinc or titanium.
Claim 30
Dependent Claim
31 words
A coated glass substrate according to any of claims 18 to 25 wherein the additional metal is aluminium in an amount equivalent to a layer 5 nm to 10 nm thick.
Claim 31
Dependent Claim
25 words
A coated glass substrate according to any of claims 18 to 26 wherein the silver layer has a thickness of 5 nm to 20 nm.
Claim 32
Dependent Claim
37 words
A coated glass substrate according to any of claims 18 to 27 wherein the total thickness of any metal oxide layers overlying the silver layer after bending and/or toughening of the glass is from 20nm to 60nm.
Claim 33
Dependent Claim
29 words
A coated glass substrate according to any of claims 18 to 28 wherein a layer or layers of metal oxide is provided between the glass and the silver layer.
Claim 34
Dependent Claim
31 words
A coated glass substrate according to claim 29 wherein the total thickness of any metal oxide layers between the glass and the silver layer is from 20 nm to 60 nm.
Claim 35
Dependent Claim
103 words
A bent and/or toughened silver-coated glass substrate having a light transmission of at least 80% of that of the uncoated glass the coating comprising an anti-reflection metal oxide layer, an oxidised layer of metal selected from aluminium, titanium, tantalum and zirconium over the anti-reflection layer, a silver layer 5 nm to 30 nm thick over said oxidised metal layer, a further oxidised layer of metal selected from aluminium, titanium, tantalum and zirconium over said silver layer, and an overlying anti-reflection metal oxide layer, the said two layers of oxidised metal having a combined total thickness in the range 8 nm to 30 nm.
Claim 36
Dependent Claim
103 words
A bent and/or toughened silver-coated glass substrate having a light transmission of at least 80% of that of the uncoated glass the coating comprising an anti-reflection metal oxide layer, an oxidised layer of metal selected from aluminium, titanium, tantalum and zirconium over the anti-reflection layer, a silver layer 5 nm to 30 nm thick over said oxidised metal layer, a further oxidised layer of metal selected from aluminium, titanium, tantalum and zirconium over said silver layer, and an overlying anti-reflection metal oxide layer, the said two layers of oxidised metal having a combined total thickness in the range 8 nm to 30 nm.
Claim 37
Dependent Claim
32 words
A bent and/or toughened silver-coated glass substrate according to claim 31 wherein each of the said two oxidised layers of metal has a thickness in the range 4 nm to 15 nm.
Claim 38
Dependent Claim
76 words
A bent and/or toughened silver-coated glass substrate having a light transmission of at least 80% of the uncoated glass, the coating comprising an anti-reflection metal oxide layer, a silver layer 5 nm to 30 nm thick over said anti-reflection layer, and an oxidised layer of titanium or tantalum over said silver layer, and an overlying anti-reflection metal oxide layer, the said layer of oxidised metal having a thickness in the range 8 nm to 30 nm.
Claim 39
Dependent Claim
76 words
A bent and/or toughened silver-coated glass substrate having a light transmission of at least 80% of the uncoated glass, the coating comprising an anti-reflection metal oxide layer, a silver layer 5 nm to 30 nm thick over said anti-reflection layer, and an oxidised layer of titanium or tantalum over said silver layer, and an overlying anti-reflection metal oxide layer, the said layer of oxidised metal having a thickness in the range 8 nm to 30 nm.
Claim 40
Dependent Claim
58 words
A bent and/or toughened silver-coated glass substrate having a light transmission of at least 80% of the uncoated glass, the coating comprising an anti-reflection metal oxide layer, a silver layer 5 nm to 30 nm thick over said anti-reflection metal layer and an overlying anti-reflection metal layer, with oxidised zinc distributed through all the layers of the coating.
Claim 41
Dependent Claim
58 words
A bent and/or toughened silver-coated glass substrate having a light transmission of at least 80% of the uncoated glass, the coating comprising an anti-reflection metal oxide layer, a silver layer 5 nm to 30 nm thick over said anti-reflection metal layer and an overlying anti-reflection metal layer, with oxidised zinc distributed through all the layers of the coating.
Claim 42
Dependent Claim
30 words
A bent and/or toughened silver-coated glass according to claim 34, wherein the zinc is present in an amount equivalent to a layer of zinc 4 nm to 15 nm thick.
Claim 43
Dependent Claim
22 words
A bent and/or toughened silver-coated glass according to any of claims 31 to 35 having a light transmission of at least 70%.
References Cited (Backward Citations)
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