Stock material or miscellaneous articles – Composite – Of quartz or glass
Reexamination Certificate
2000-05-18
2002-11-26
Dawson, Robert (Department: 1712)
Stock material or miscellaneous articles
Composite
Of quartz or glass
C428S428000, C428S446000, C428S447000, C428S448000, C428S528000, C428S033000, C428S034000, C428S036700, C428S042100
Reexamination Certificate
active
06485838
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a coating composition improved in the resistance to fouling derived from water and oil repellency, the durability and the abrasion resistance, and in the release and exfoliation of stacked outer layer, and to a coated film and glass each having a coating layer comprised thereof.
BACKGROUND OF THE INVENTION
Organosilane coating materials have technically been developed for use as maintenance-free coating materials which are advantageous for the resistance to weather (and sunlight), fouling, and so forth. The demand for improving the performance of organosilane coating materials is overwhelmingly increased. Therefore, it is now desired to provide coating materials which are improved in the coating appearance, the adhesiveness, the resistance to weather, heat, alkalis, organic chemicals, moisture, and (hot) water, the insulating property, the abrasion resistance, the resistance to fouling, and so forth.
Particularly for improving the resistance to fouling, it is known to make the surface of a coating hydrophilic. However, hydrophilization is a treatment to enhance the effect of washing and removing out of contaminants. Therefore, only in the case that the effect of washing overcomes the contamination, the hydrophilized coating shows the resistance to fouling. On the contrary, by the method of imparting the water and oil repellency to the coating layer, it is able to prevent the adhesiveness of both of hydrophilic and lipophilic contaminants. In prior art, addition of oils or surfactants to the coating composition is made in order to impart the water and oil repellency to the coating layer. By the addition of those, it is not able to maintain the abrasion resistance for a long period of time.
Further disclosed are a composition adapted for use as a composition which satisfies the requirements for performance of an organosilane coating material and composed mainly of a partial condensate of organosilane, a dispersion of colloidal silica, and an acrylic resin denatured by a silicone (See Japanese Patent Laid-open Publication (Sho) 60-135465), a composition composed mainly of a condensate of organosilane, a chelate compound of zirconium alkoxide, and a hydrolytic silyl-based vinyl resin (Japanese Patent Laid-open Publication (Sho) 64-1769), and a compound composed mainly of a condensate of organosilane, a colloidal alumina, and a hydrolytic silyl-based vinyl resin (See U.S. Pat. No. 4,904,721).
However, coatings made of the compositions disclosed in (Japanese Patent Laid-open Publication (Sho) 60-135465) and U.S. Pat. No. 4,904,721 have the disadvantage that their glittering property may be declined when they are exposed to ultraviolet light for a considerable length of time. Also, the composition disclosed in (Japanese Patent Laid-open Publication (Sho) 64-1769) is low in the storage stability; it may easily be turned to gel within a short period of time when its solid density is increased.
We, the inventors, have invented a composition for coating which includes a hydrolyzate and/or a partial condensate of organosilane, a vinyl resin having a silyl group wherein silicon atoms are bonded with a hydroxy group and/or a hydrolyzate, a metallic chelate compound, &bgr;-diketone and/or &bgr;-ketoester (See Japanese Patent Laid-open Publication (Hei) 5-345877). Since this composition has a favorable balance over the coating characteristics required for any organosilane coating material, new coating materials having more improvement in the coating characteristics such as the water and oil repellency and the smoothness of the surface of the coating layer shall be required.
Moreover, a coated film having photocatalytic function is proposed, formed by coating a film substrate. For example, in Japanese Patent Laid-open Publication (Hei) 9-227161, a self-cleaning film having a surface layer containing substantially transparent particles of a photocatalytic metal oxide on a film substrate surface, is disclosed. Also, a photocatalytic sheet having a photocatalytic coating formed on its upper surface and provided at its lower surface with an adhesive coating for attaching to another device or material to offer a photocatalytic function is disclosed in Japanese Patent Laid-open Publication (Hei) 9-313887. However, these coated films or sheets show the resistance to fouling by the highly hydrophilicity derived from photocatalyzation. Therefore, those show the effect only by irradiation and effect of removing out of contaminants only by washing or raining.
Moreover, an anti-fogging window glass having a surface layer provided on a window glass substrate and containing substantially transparent particles of a photocatalytic oxide is disclosed in Japanese Patent Laid-open Publication (Hei) 9-227161. The above glass may however show the effect only by irradiation and watering (raining), and easily fouled by oils because of its lipophilicity.
Also, a coated glass having a surface layer (10 to 200 nm thickness) composed of a photocatalytic metal oxide such as titanium dioxide provided on a glass substrate is disclosed in Japanese Patent Laid-open Publication (Hei) 9-235140. The coated glass is however regarded as inferior to the durability because it is provided without binder. Further, in Japanese Patent Laid-open Publication (Hei) 9-227159, an automobile window glass having a surface layer containing substantially transparent materials of a photocatalytic semiconductor on a glass substrate surface, is disclosed. The window glass is however regarded as inferior to the durability because of containing no binder.
SUMMARY OF THE INVENTION
The present invention has been invented in view of overcoming the foregoing technical drawbacks of the prior arts and its object is to provide a coating composition improved in the resistance to fouling derived from water and oil repellency, the durability and the abrasion resistance, and to a coated film and glass each having a coating layer comprised thereof.
1. A coating composition containing at least one component (a) selected from organosilanes, hydrolyzates of the organosilanes, and condensates of the organosilanes represented by Formula 1
(R
1
)
n
Si(OR
2
)
4- n
(1)
(wherein, R
1
is a monovalent organic group having 1 to 8 carbon atoms: when two exist, they are either identical to or different from each other; R
2
is an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms: when two exist, they are either identical to or different from each other; and n is an integer ranging from 0 to 2);
and a polymer component (b) having a silyl group wherein silicon atoms are bonded with a hydrolytic group and/or a hydroxy group (referred to as a fluoropolymer having a silyl group hereinafter);
wherein the component (b) comprises a substance selected from polymers having a structural unit (b-1) expressed by Formula 2 (referred to as structural unit (b-1) hereinafter)
(wherein, R
3
to R
5
are C
m
Y
2m+1
, m is an integer ranging from 0 to 5, and Y is selected from F, H, and Cl separately) and/or a structural unit (b-2) expressed by Formula 3 (referred to as structural unit (b-2) hereinafter)
(wherein, R
f
is an alkyl group or an alkoxyalkyl group having fluorine atoms and R
3
to R
5
are analogous to those in Formula 2 or may be modified without departing from the term of analogy).
2. A coated film having a coating layer comprised of a coating composition according to item 1.
3. A coated film having a coating layer comprised of the composition (i) or (ii), wherein,
the composition (i) is a coating composition containing at least one component (a) selected from organosilanes, hydrolyzates of the organosilanes, and condensates of the organosilanes represented by Formula 1
(R
1
)
n
Si(OR
2
)
4- n
(1)
(wherein, R
1
is a monovalent organic group having 1 to 8 carbon atoms: when two exist, they are either identical to or different from each other; R
2
is an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms: when two exi
Hashiguchi Yuichi
Sakagami Toshinori
Shiho Hiroshi
Shimada Mibuko
Dawson Robert
Feely Michael J
JSR Corporation
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