Coating processes – Nonuniform coating – Applying superposed diverse coatings or coating a coated base
Reexamination Certificate
1999-05-26
2001-05-15
Beck, Shrive (Department: 1762)
Coating processes
Nonuniform coating
Applying superposed diverse coatings or coating a coated base
C427S264000, C427S270000, C427S271000, C427S287000, C216S024000, C216S097000
Reexamination Certificate
active
06231924
ABSTRACT:
TECHNICAL FIELD
The present invention belongs to a technical field of an inorganic substrate having formed thereon oxide layer, which is used for automobiles, buildings, various industrial instruments, etc. Particularly, the invention belongs to a technical field of an inorganic substrate having formed oxide layer on the necessary portions only of the surface thereof.
BACKGROUND ART
On the surface of a glass plate or a ceramic plate, oxide layers having various functions according to the use are formed. For example, as glasses used for automobiles, vehicles, buildings, etc., a heat-reflective layer containing the oxide of titanium, cobalt, etc., is generally used for the purpose of reducing the cooling load, etc. Also, as glass substrates for various displays, an electrically conductive film comprising tin oxide, etc., is used from the necessity of element driving. These layers are frequently formed on only parts of the surface of a substrate for the necessity of each use described above.
In not only the use of display but also other uses of automobiles, buildings, etc., there is a case of requiring that the layer is partially formed. For example, in the case of using a heat-reflective glass for the back window of automobile, it is required that a layer is not formed on the glass surface adjacent to a high-mount stop lamp disposed in the inside of the back window of the automobile but a layer is formed on other portion of the glass surface for shielding heat rays while ensuring visibility of the lamp.
In such a case, a method of foaming the layer after previously applying masking to the necessary portion of the glass plate or a method of applying masking after forming a layer on the whole glass plate and removing the remaining unmasked portion of layer with a solvent, by releasing, or polishing, etc., is employed.
However, according to the conventional methods as described above, masking is required in any method, which is accompanied by complicated steps and operations, and thus the effective and ensure partial formation of layer has been difficult by the conventional methods.
DISCLOSURE OF THE INVENTION
The present invention has been made for solving the above-described problems and an object of the present invention is to provide a method of partially forming a layer on the surface of a substrate by a simple and ensure method.
According to the present invention, the above-described object can be attained by the method of partially forming an oxide layer on the surface of an inorganic substrate, comprising
a step of forming a layer comprising an oxide on the surface of the inorganic substrate,
a step of contacting the layer of a definite range to be removed with other inorganic compound than the above-described oxide to dissolve the above-described layer of the definite range with the inorganic compound, and
a step of removing the dissolved layer of the above-described definite range together with the above-described inorganic compound.
Also, the preferred embodiments of the present invention are as follows.
(1) The melting point of the above-described inorganic compound is 500° C. or lower or the softening point thereof is 500° C. or lower.
(2) The above-described dissolving step is a step of carrying out the dissolution by heating the oxide layer of the definite range together with the above-described inorganic compound.
(3) The above-described inorganic compound includes at least one kind selected from the group consisting of phosphorus compounds each containing oxygen as a constituent and boron compounds each containing oxygen as a constituent.
(4) The above-described phosphorus compound includes at least one kind selected from the group consisting of phosphoric acid and phosphates and the above-described boron compound includes boric acid and borates.
(5) The above-described inorganic compound is a glass and contains at least one kind selected from the group consisting of P
2
O
5
, PbO, B
2
O
3
, ZnO, and Bi
2
O
3
as the constituent.
The inorganic compound used in the present invention may be an inorganic compound which can dissolve the oxide of the layer when the compound is contacted with the oxide constituting the layer and further the contacted layer is heated and can keep the structure and the physical characteristics of the inorganic substrate, and can be properly selected according to the properties of the layer and the substrate. As a method of removing the above-described inorganic compound after dissolving the layer, a physical means and/or a chemical means can be applied. For example, as the physical means, there are wiping off, blowing off, etc., and as the chemical means, there are dissolving of the layer with a solvent, etc. As a preferred embodiment of a preferred removing means of a layer, there is cleaning with an organic solvent such as alcohols (e.g., methanol and ethanol) followed by drying and as the case may be, the means can be carried out together with the above-described physical means.
In the present invention, it is preferred that about the layer to be removed, which corresponds to the region of existing the inorganic compound contacted with the layer, all the layer of the corresponding region is removed, but the residue of the layer to an extent of not preventing the visibility can be allowed in this invention.
As the inorganic compounds which are generally used in this invention, there are phosphorus compounds containing oxygen as the constituent, boron compounds containing oxygen as the constituent, etc., each having a melting point of 500° C. or lower and being a liquid at normal temperature. Preferably, there are phosphoric acids, phosphates, boric acid, and borates satisfying the above-described conditions as shown below. The phosphoric acid in this invention means the general names of the acids formed by the hydration of diphosphorus pentoxide and includes orthophosphoric acid (H
3
PO
4
, liquid at normal temperature), pyrophosphoric acid (H
4
P
2
O
7
, liquid at normal temperature), triphosphoric acid (H
5
P
3
O
10
, liquid at normal temperature), etc. Also, practical examples of the phosphate include sodium dihydrogenphosphate (NaH
2
PO
4
) (typically, dihydrate: NaH
2
PO
4
.2H
2
O, melting point 60° C.) and potassium dihydrogenphosphate (KH
2
PO
4
, melting point 96° C.). The borates practically include boric acid (H
3
BO
3
, melting point 185° C.), etc.
Furthermore, as the inorganic compound having a melting point of 500° C. or lower, there are glasses. As the glass, glasses having generally a low-melting point composition (so-called low-melting glasses) are suitable and the glasses containing P
2
O
5
, B
2
O
3
, ZnO, PbO, Bi
2
O
3
, etc., are preferred. Practically, the glass composition series such as an R
2
O—P
2
O
5
series, an R
2
O—B
2
O
3
series, a PbO—B
2
O
3
—ZnO series, a PbO—SiO
2
—B
2
O
3
series, a Bi
2
O
3
—ZnO—B
2
O
3
series, an R
2
O—ZnO—SiO
2
—B
2
O
3
series, a ZnO—B
2
O
3
series, an R
2
O—ZnO—P
2
O
5
series (wherein, R represents an alkali metal such as Na, K, etc.), etc., can be suitably used.
In the present invention, it is a feature that by contacting the inorganic compound with the oxide constituting the layer, the layer is dissolved. To practice the dissolution of the layer, it is more preferred that the inorganic compound is contacted with only a portion of the surface of the layer and dissolution of the layer is progressed.
Furthermore, it is preferred to dissolve the layer by heating in the state that the inorganic compound is contacted with the oxide constituting the layer. To practice the dissolution of the layer, it is more preferred to contact the inorganic compound with only a part of the surface of the layer and progress the dissolution of the layer by heating.
As a method of selectively contacting the inorganic compound with a part of the layer, the following method can be illustrated.
(1) A liquid, powders, or granules each containing the inorganic compound are placed on a part of the surface of the layer.
(2) A paste obtained by mixing the inorganic compound with an organic solvent, a solid
Nakagaki Shigeki
Sakaguchi Koichi
Sakai Yasuto
Beck Shrive
Crockford Kirsten A.
Nippon Sheet Glass Company Limited
Sughrue Mion Zinn Macpeak & Seas, PLLC
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