Stock material or miscellaneous articles – Composite – Of quartz or glass
Reexamination Certificate
1999-07-29
2003-08-19
Jones, Deborah (Department: 1774)
Stock material or miscellaneous articles
Composite
Of quartz or glass
C428S208000, C428S209000, C428S426000
Reexamination Certificate
active
06607832
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an ultraviolet/infrared absorbent glass having a greenish color shade. Particularly, it relates to an ultraviolet/infrared absorbent glass and an ultraviolet/infrared absorbent glass plate which have a high visible light transmittance and a light greenish color shade so that it is useful for a window of a vehicle and a building, and also relates to a colored film-coated ultraviolet/infrared absorbent glass plate prepared by applying a colored film onto the ultraviolet/infrared absorbent glass plate and a window glass of a vehicle employing the colored film-coated ultraviolet/infrared absorbent glass plate.
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
Recently, a variety of glasses having an ultraviolet/infrared absorptivity and a greenish color shade to be used as a vehicle windshield have been proposed with the view of preventing degradation of luxurious interior materials and reducing cooling load of the vehicle.
For example, an ultraviolet/infrared absorbent glass having a greenish color shade disclosed in the Japanese Patent H6-88812B consists of soda-lime-silica glass including colorants consisting of 0.65 to 1.25 wt. % the total iron oxide expressed as Fe
2
O
3
, 0.2 to 1.4 wt. % CeO
2
or 0.1 to 1.36 wt. % CeO
2
and 0.02 to 0.85 wt. % TiO
2
.
An ultraviolet/infrared absorbent glass having a relatively lighter greenish color shade disclosed in the Japanese Patent H5-78147A consists of a base glass consisting of 68 to 72 wt. % SiO
2
, 1.6 to 3.0 wt. % Al
2
O
3
, 8.5 to 11.0 wt. % CaO, 2.0 to 4.2 wt. % MgO, 12.0 to 16.0 wt. % Na
2
O and 0.5 to 3.0 wt. % K
2
O and colorants comprising 0.58 to 0.65 wt. % the total iron oxide expressed as Fe
2
O
3
, 0.1 to 0.5 wt. % CeO
2
and 0.1 to 0.4 wt. % TiO
2
.
An ultraviolet/infrared absorbent glass disclosed in the Japanese Patent H8-208266A or the Japanese Patent H9-208254A has a relatively high visible light transmittance or a greenish color shade having high see-through visibility.
An ultraviolet/infrared absorbent glass disclosed in the Japanese Patent H8-208266A consists of soda-lime-silica glass including colorants comprising 0.52 to 0.63 wt. % the total iron oxide expressed as Fe
2
O
3
, 0.9 to 2 wt. % total CeO
2
and 0.2 to 0.6 wt. % TiO
2
wherein the iron having 2 valences expressed as Fe
2
O
3
is 28 to 38 wt. % of the total iron oxide expressed as Fe
2
O
3
.
An ultraviolet/infrared absorbent glass disclosed in the Japanese Patent H9-208254A consists of a base glass comprising 67 to 75 wt. % SiO
2
, 0.05 to 3.0 wt. % Al
2
O
3
, 7.0 to 11.0 wt. % CaO, 2.0 to 4.2 wt. % MgO, 12.0 to 16.0 wt. % NaO, 0.5 to 3.0 wt. % K
2
O, 0.05 to 0.30 wt. % S0
3
and 0 to 1 wt. % SnO
2
and colorants comprising 0.40 to 0.90 wt. % the total iron oxide expressed as Fe
2
O
3
, 1.0 to 2.5 wt. % CeO
2
, 0.1 to 1.0 wt. % TiO
2
, 0.0010 to 0.040 wt. % MnO, 0.0001 to 0.0009 wt. % CoO and 0.0001 to 0.0010 wt. % Cr
2
O
3
.
The aforementioned conventional ultraviolet/infrared absorbent glasses generally have problems as followings.
An ordinary ultraviolet/infrared absorbent glass having a greenish color shade including the glass disclosed in the Japanese Patent H6-88812B is possibly improved in the ultraviolet and infrared absorptibity so far as the visible light transmittance is within a permissive range (for example, more than 70% when the glass is employed for a front windshield of a vehicle.) and has a relatively deep greenish color shade having the excitation purity in a range of 2.4 to 3.3%. However, a glass having a light greenish color shade is sometimes preferred for a window of a vehicle and for a window of a building.
A glass having a possibly high ultraviolet and infrared absorptivity with a high visible light transmittance can be required for a window of a building.
A glass plate can be employed for a window of a vehicle not only alone but with a variety of coatings applied onto a surface thereof. When the glass has a coating on a surface thereof, the coating reduces the visible light transmittance of the glass plate. Therefore, when the glass has a visible light transmittance having a value being proximity to a lower limit of the aforementioned permissive range before being applied with a coating, even if the value is in the permissive range (for example, a value of slightly more than 70%), the value of the visible light transmittance easily becomes less than 70% after applying the coating. In this case, the glass can be hardly applied with a desired coating thereon.
The ultraviolet/infrared absorbent glass disclosed in the Japanese Patent H5-78147A has a relatively lighter greenish color shade. The glass having a thickness of 5 mm has a visible light transmittance of 71% at most, which is not sufficiently high. Although the glass has a relatively lighter greenish shade having an excitation purity of equal to or less than 5%, specifically, the value of the excitation purity is equal to or more than 3.2% and its greenish color shade is not too light.
The ultraviolet/infrared absorbent glass disclosed in the Japanese Patent H8-208266A has a relatively high visible light transmittance and includes the total iron oxide expressed as Fe
2
O
3
in a range of 0.52 to 0.63 wt. % and iron having two valences expressed as Fe
2
O
3
in a range of 28 to 38 wt. % of the total iron oxide. Although the glass provides a high solar ray absorptivity, i.e. a low solar energy transmittance, the visible light transmittance of the glass is in a range of 72.0 to 74.4% when the glass has a thickness of 3.5 mm, in a range of 71.4 to 72.9% when the glass has a thickness of 5 mm, which is not too high in substantial.
Although the ultraviolet/infrared absorbent glass disclosed in the Japanese Patent H9-208254A has a relatively high see-through visibility and provides a high solar ray absorptivity, the visible light transmittance thereof is in a range 65.5 to 67.6% when the glass has a thickness of 5 mm, and it is not too high. The excitation purity thereof is equal to or more than 2.9% and the greenish color shade thereof is not too light. While this glass comprises coo and Cr
2
O
3
as essential constituents in order to control the color tone of the glass easily, these constituents are not preferable to be included for the purpose of providing a light color shade and a high visible light transmittance because they deepen the color tone of the glass and reduce the visible light transmittance even when the glass includes them in small quantity.
The colored film-coated glass can be prepared in the ion exchanging process in which ultrafine grains of an inorganic salt including silver or copper enter into the glass base due to baking the glass applied with the-inorganic salt including silver or copper on a surface thereof to cause the transparent colloidal development, in the metallic film forming process in which a metallic film is flashed onto the glass base due to sputtering, or in the film forming process in which a film of metallic ultrafine grains is formed due to heating the glass base applied with the metallic salt compound dissolved into the solution of the metal alcoxide.
The color development due to the surface plasmon of the metallic ultrafine grains is superior in the heat resistance and the light resistance and has been used in coloring of the glass or the earthenware. For example, according to J. Sol-Gel. Sci. Techn. 305-312(1994), the colored film is obtained due to forming the fine grains of gold by heating the glass base applied with the solution of alcoxide including chloroaurate and silane.
In order to provide the glass with the ultraviolet absorptivity, the metallic oxide including zinc oxide, titanium oxide and cerium oxide is often applied on the glass base in the Sol-Gel process or sputtering process. Recently, the glass base far improved in the ultraviolet screening ability due to the cerium ion is produced in the floating process and becomes employed for a window glass of a vehicle positively. However, the glass having an ultraviolet screening ability is yet minor and only a few
Kawazu Mitsuhiro
Kuroda Isamu
Nagashima Yukihito
Tsujino Toshifumi
Jones Deborah
Kanesaka & Takeuchi
Nippon Sheet Glass Co. Ltd.
Piziali Andrew T
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