EP0024900A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Oxide protected mirror and method of making it
Assignee: Westinghouse Electric Corp
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Filing: 1980-08-22
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Granted: —
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Expires: 2000-08-22
Abstract
Abstract A mirror is made by applying a coating to a highly reflective surface of a substrate. The coating is prepared from a composition of an alkoxide having the general formula M(OR)n, where M is 0 to 100%titanium, 0 to 25% silicon, 0 to 100% tantalum, or 0 to 15% of a metal ion which forms an alkoxide, R is alkyl from C 1 to C 6 and n is the valence of M, from 1.7 to 8 moles of water per mole of alkoxide, sufficient alcohol to give a solids content of from 0.5 to 15%, and a sufficient amount of a suitable acid to prevent cloudiness. The coated substrate is fired at from 200 to 600°C to form an oxide coating which is substantially oxygen impervious. Additional layers of the coating may be applied and fired until the oxide coating is from 200 to 5000A thick, avoiding quarter-wave thicknesses.
Inventors
- 👤 Bulent E. Yoldas
- 👤 Arthur M. Filippi
- 👤 Raymond W. Buckman Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 20:50
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/0816; G02B5/0825; G02B5/0833; C; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3605; C03C17/3644; C03C17/3649; C03C17/3657; C03C17/3663; F; F24; F24S; F24S23/00; F24S23/70; F24S23/82; G02B5/0891; Y; Y02; Y02E; Y02E10/00; Y02E10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
67 words
A mirror which comprises a highly reflective surface on a substrate and a protective coating on said surface, characterized in that said coating is composed of metal oxide selected from 0 to 100% of a titanium oxide, 0 to 25% of a silicon oxide, 0 to 100% of a tantalum oxide, and 0 to 15% of a metal oxide of an alkoxide-forming metal and is substantially oxygen-impervious.
Claim 2
Dependent Claim
67 words
A mirror which comprises a highly reflective surface on a substrate and a protective coating on said surface, characterized in that said coating is composed of metal oxide selected from 0 to 100% of a titanium oxide, 0 to 25% of a silicon oxide, 0 to 100% of a tantalum oxide, and 0 to 15% of a metal oxide of an alkoxide-forming metal and is substantially oxygen-impervious.
Claim 3
Dependent Claim
19 words
A mirror according to claim 1, characterized in that the metal oxide is about 100% of a titanium oxide.
Claim 4
Dependent Claim
22 words
A mirror according to claim 1, characterized in that the surface is composed of silver or aluminum and the substrate of glass.
Claim 5
Dependent Claim
20 words
A mirror according to claims 1, 2 or 3, characterized in that the reflective surface faces away from the substrate.
Claim 6
Dependent Claim
22 words
A mirror according to any of claims 1 to 4, characterized in that the oxide coating is from 200 to 5000h thick.
Claim 7
Dependent Claim
18 words
A mirror according to claim 5, characterized in that the oxide coating is from 1000 to 3000Å thick.
Claim 8
Independent Claim
159 words
A method of making a mirror which comprises coating a highly reflective surface on a substrate with a protective composition characterized by (A) coating said surface with: (1) alkoxide having the general formula M(OR) , where M is selected from the group consisting of 0 to 100% Ti, 0 to 25% Si, 0 to 100% Ta, and 0 to 15% of a metal ion which forms an alkoxide, R is alkyl from C 1 to C 6 and n is the valence of M; (2) from 1.7 to 8 moles of water per mole of alkoxide; (3) sufficient alcohol to give a solids content of from 0.1 to 15%, and (4) a sufficient amount of a suitable acid to prevent cloudiness; (B) firing said coated substrate at from 200 to 600°C to form an oxide coating which is substantially oxygen impervious, and (C) repeating steps (A) and (B), as necessary, until said oxide coating is of a desirable thickness.
Claim 9
Independent Claim
159 words
A method of making a mirror which comprises coating a highly reflective surface on a substrate with a protective composition characterized by (A) coating said surface with: (1) alkoxide having the general formula M(OR) , where M is selected from the group consisting of 0 to 100% Ti, 0 to 25% Si, 0 to 100% Ta, and 0 to 15% of a metal ion which forms an alkoxide, R is alkyl from C 1 to C 6 and n is the valence of M; (2) from 1.7 to 8 moles of water per mole of alkoxide; (3) sufficient alcohol to give a solids content of from 0.1 to 15%, and (4) a sufficient amount of a suitable acid to prevent cloudiness; (B) firing said coated substrate at from 200 to 600°C to form an oxide coating which is substantially oxygen impervious, and (C) repeating steps (A) and (B), as necessary, until said oxide coating is of a desirable thickness.
Claim 10
Dependent Claim
17 words
A method according to claim 7, characterized in that oxide coating is from 200 to 5000Å thick.
Claim 11
Dependent Claim
18 words
A method according to claim 8, characterized in that the oxide coating is from 1000 to 30001 thick.
Claim 12
Dependent Claim
20 words
A method according to claim 7, 8 or 9, characterized in that the oxide coating is about 100% titanium oxide.
Claim 13
Independent Claim
27 words
A method according to any of claims 7 to 10, characterized in that the surface is composed of silver or aluminum and the substrate is of glass.
Claim 14
Independent Claim
21 words
A method according to any of claims 7 to 11, characterized in that the reflective surface faces away from the substrate.
Claim 15
Independent Claim
21 words
A method according to any of claims 7 to 12, characterized in that the firing is at from 300 to 600°C.
Claim 16
Independent Claim
24 words
A method according to any of claims 7 to 13, characterized in that the firing is in a vacuum or in an inert atmosphere.
References Cited (Backward Citations)
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