Nonfogging and stainproof glass articles

• US 6,379,776 B1
• Filed: 07/16/1999
• Issued: 04/30/2002
• Est. Priority Date: 12/18/1996
• Status: Expired due to Fees

• Current Assignee: Nippon Sheet Glass Company Limited, NSG Techno-Research Co., Ltd. (Nippon Sheet Glass Company Limited)
• Original Assignee: Nippon Sheet Glass Company Limited, NSG Techno-Research Co., Ltd. (Nippon Sheet Glass Company Limited)
• Inventors: Hattori, Akihiko, Shimoda, Koji, Tada, Hiroaki, Doushita, Kazuhiro, Sunada, Takashi
• Primary Examiner(s): Jones, Deborah
• Assistant Examiner(s): BOSS, WENDY L
• Application Number:
  US09/125,406
• Time in Patent Office: 1,019 Days
• Field of Search: 428/325, 428/142, 428/149, 428/432, 428/428, 428/447, 428/429
• US Class Current: 428/149
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 17/42 at least one coating of an organic material and at least one non-metal coating
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2217/77 Coatings having a rough surface
• CPC Class Codes: Y10T 428/24421 Silicon containing
• CPC Class Codes: Y10T 428/252 Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

The present invention relates to An anti-fogging and stain-prevented glass article having an alkali shut-off film and a photocatalytic film in the order laminated on the surface of glass substrate, in which dents and projections having an arithmetical mean roughness (Ra) from 1.5 to 80 nm and mean interval (Sm) of dents and projections from 4 to 300 nm are formed thereon, and to An anti-fogging and stain-prevented glass article having an alkali shut-off film, a photocatalytic film, and a silicon oxide monocomponent equivalent layer or a layer of organosilane including at least one kind of functional group selected from polyalkyleneoxide group, alkyl group, alkenyl group and aryl group in its molecules or its hydrolyzed substance, laminated in the order on the surface of a glass article. The abovementioned anti-fogging and stain-prevented glass article can be used for window glasses of automobiles and buildings, and glasses, etc.

Claims

1. An anti-fogging and stain prevented glass article having (i) an alkali shut-off film, (ii) a photocatalytic film and (iii) an organic substance adhesion preventing layer composed of a layer of silica laminated in the order on the surface of a glass substrate and having dents and projections formed on the surface of the photocatalytic film, which have an arithmetical mean roughness (Ra) from 1.5 to 80 nm and a mean interval (Sm) of dents and projections from 4 to 300 nm.

2. An anti-fogging and stain-prevented glass article as set forth in claim 1, wherein said organic substance adhesion preventing layer has a mean number of molecules from 0.5 to 5 in its thickness direction.

3. An anti-fogging and stain-prevented glass article as set forth in claim 1, wherein said dents and projections are formed by surface dents and projections of said alkali shut-off film.

4. An anti-fogging and stain-prevented glass article as set forth in claim 1, wherein the dents and projections are formed in the light catalyst film, and the alkali shutoff film is free from surface dents and projections.

5. An anti-fogging and stain-prevented glass article as set forth in claim 1, wherein said photocatalytic film contains titanium oxide at a ratio of 10 or more percent by weight.

6. An anti-fogging and stain-prevented glass article as set forth in claim 5, wherein said photocatalytic film consists of titanium oxide.

7. An anti-fogging and stain-prevented glass article as set forth in claim 5, wherein said photocatalytic film further contains fluorine atoms.

8. An anti-fogging and stain-prevented glass article as set forth in claim 7, wherein said photocatalytic film contains said fluorine atoms at a ratio of 0.002 to 1 percent by weight.

9. An anti-fogging and stain-prevented glass article as set forth in claim 1, wherein said photocatalytic film has a thickness from 10 to 500 nm.

10. An anti-fogging and stain-prevented glass article as set forth in claim 1, wherein said alkali shut-off film consists of at least one kind of metal oxide substrate, which is selected from a group consisting of silicon oxide, aluminium oxide, titanium oxide, zirconium oxide, and cerium oxide.

11. An anti-fogging and stain-prevented glass article as set forth claim 1, wherein said alkali shut-off film is a film mainly composed of silicon oxide.

12. An anti-fogging and stain-prevented glass article as set forth in claim 1, wherein said alkali shut-off film has a thickness from 10 to 300 nm.

13. An anti-fogging and stain-prevented glass article as set forth in claim 1, wherein said alkali shut-off film contains fluorine atoms.

14. An anti-fogging and stain-prevented glass article as set forth in claim 13, wherein said alkali shut-off film has fluorine at a ratio from 0.002 to 10 percent by weight.