Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2001-11-26
2003-07-29
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S588000, C524S859000, C528S012000, C556S450000, C556S455000, C556S457000
Reexamination Certificate
active
06599976
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a coating process capable of preventing a painted or non-painted surface of building structures, civil engineering structures, industrial equipments, traffic signs and the like from being contaminated with dirt or oils, or readily removing contaminants attached thereto by falling rain or wiping, and a liquid composition suitably used in the coating process.
In recent years, great importance is placed on an appearance of building structures, civil engineering structures, etc., for maintaining its harmonization with surrounding urban sights. For this reason, the surface of such structures has been finish-coated with various low-staining paints in order to enhance an anti-staining property thereof. As the conventional low-staining finish-coating methods, there are known those methods in which high weather-resistant organic paints such as fluororesin-based paints, acrylic silicone-based paints and urethane-based paints are used to form a finish coat (top coat).
Also, recently, such a composition prepared by adding a small amount of alkylsilicate to these paints has been used to impart a hydrophilic property to the surface of the resultant coating film, thereby preventing various contaminants such as dirt and oils from being attached thereto, and allowing these contaminants, if attached, to be readily washed off by water drops of falling rain or the like. On the other hand, inorganic paints composed mainly of organopolysiloxanes have been positively developed and recently commercialized because these inorganic paints are usually excellent in weather resistance, durability, chemical resistance, heat resistance or the like as compared to the above organic paints.
However, in the case where these organic or inorganic paints are used to form a top coat, there are commonly required time-consuming additional steps for forming an undercoat and, if necessary, an intermediate coat between the structure (base material) and the top coat in order to further enhance the adhesion therebetween. In particular, the coating film made of the organic paints tends to be readily contaminated with sand and dust, metal powder, falling rain (e.g., acidic rain) or exhaust gases when exposed thereto, resulting in deteriorated appearance of the structure.
Also, the paints for top coat which are prepared by adding a small amount of alkylsilicate to these organic paints, tend to suffer from various problems such as increase in its viscosity upon storage, cracks and poor film properties of a coating film produced therefrom, or the like. Therefore, care must be taken upon handling and application of these organic paints. On the other hand, many of the inorganic paints also tend to undergo various problems such as poor storage stability and cracks of thick coating films similarly to the above organic paints containing a small amount of alkylsilicate, and further require an additional heat-curing step. Therefore, care must also be taken upon handling and application of these inorganic paints.
In addition, the above paints are classified into dangerous substances under the Fire Protection Law because they contain a large amount of volatile organic solvents. Thus, great care must be needed for safe handling thereof. A present, it has been strongly required to solve the above problems concerning safety of paints and properties of resultant coating films as well as workability and safety upon coating.
As a result of the present inventors' earnest studies for solving the above problems, it has been found that by wiping the surface of painted or non-painted structures such as building structures, civil engineering structures, industrial equipments and traffic signs with a paper, cloth, non-woven fabric, etc., which is impregnated with a specific silicon-containing liquid composition mentioned below, or by spray-coating the surface of the painted or non-painted structures with an aerosol formed of the specific silicon-containing liquid composition, the obtained coating film can prevent the surface of the structures from being contaminated, or can allow contaminants, if attached thereto, to be readily removed therefrom. The present invention has been attained on the basis of this finding.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a coating composition which can be applied directly or through a previous coating film onto the surface of various structures such as building structures and civil engineering structures without formation of any underlying coat, thereby imparting excellent properties such as anti-staining property and weather resistance thereto, and a coating process using the coating composition.
To accomplish the aims, in a first aspect of the present invention, there is provided a silicon-containing liquid composition comprising (A) 100 parts by weight of an organosilicate, calculated as SiO
2
, (B) 0.1 to 10 parts by weight of a catalyst, (C) 100 to 50,000 parts by weight of water, and (D) 100 to 50,000 parts by weight of a solvent, a weight ratio of the water (C) to the solvent (D) being in the range of 30:70 to 80:20.
In a second aspect of the present invention, there is provided a silicon-containing liquid composition as defined in the first aspect, having a hydrolysis percentage of 1,000 to 90,000%.
In a third aspect of the present invention, there is provided a silicon-containing liquid composition as defined in the first aspect, further comprising (E) at least one additive selected from the group consisting of pigments, fillers and paint additives.
In a fourth aspect of the present invention, there is provided a silicon-containing liquid composition as defined in the first aspect, wherein the organosilicate (A) is represented by the general formula:
SiO
x
(OR)
y
wherein x is a number of 0 to 1.2, and y is a number of 1.4 to 4 with the proviso that (2x+y) is 4; and R is C
1
to C
4
alkyl.
In a fifth aspect of the present invention, there is provided a silicon-containing liquid composition as defined in the first aspect, wherein the organosilicate (A) is methyl silicate.
In a sixth aspect of the present invention, there is provided a coating process comprising:
coating a surface of a structure with the silicon-containing liquid composition as defined in the first aspect so as to prevent the surface of the structure from being contaminated.
In a seventh aspect of the present invention, there is provided a coating process comprising:
coating a surface of an inorganic structure with the silicon-containing liquid composition as defined in the first aspect so as to prevent the surface of the inorganic structure from being contaminated.
In an eighth aspect of the present invention, there is provided a coating process comprising:
forming the silicon-containing liquid composition as defined in the first aspect into an aerosol; and
spray-coating the aerosol onto a surface of a structure.
In a ninth aspect of the present invention, there is provided a coating process comprising:
wipe-coating a surface of a structure with the silicon-containing liquid composition as defined in the first aspect.
In a tenth aspect of the present invention, there is provided a coating film produced from the silicon-containing liquid composition as defined in the first aspect, said coating film having a surface resistivity of 7.5×10
7
to 1.5×10
12
.
In an eleventh aspect of the present invention, there provided a coating film produced from the silicon-containing liquid composition as defined in the first aspect, said coating film having a water contact angle of 5° to 35°.
In a twelfth aspect of the present invention, there is provided a silicon-containing liquid composition comprising (A) 100 parts by weight of an organosilicate, calculated as SiO
2
, (B) 0.1 to 10 parts by weight of a catalyst, (C) 5,000 to 30,000 parts by weight of water, and (D) 5,000 to 30,000 parts by weight of a solvent, and having a hydrolysis percentage of 10,000 to 90,000%, a weight ratio of the water (C) to the solvent (D) being in the range of
Fukamachi Wakako
Honma Naoki
Kobayashi Katsuo
Matsuzoe Nobuyuki
Sawai Takeshi
Dawson Robert
Mitsubishi Chemical Corporation
Robertson Jeffrey B.
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