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
2001-07-23
2003-06-03
Szekely, Peter (Department: 1714)
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...
C524S243000, C524S244000, C524S247000, C524S251000, C524S267000, C524S588000, C524S731000, C524S832000, C524S837000, C524S506000, C524S560000
Reexamination Certificate
active
06573321
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an anti-contamination coating composition used for surface finishing of various materials such as metal, glass, porcelain tile, concrete, sideboard, extrusion-molded plate, plastic and the like. More particularly, it relates to an anti-contamination coating composition used for coating finishing of structures such as building structures, bridges and the like, which can also be coated directly on a substrate and can also be used in a coating composition used as a final finishing coating such as various finishing coatings, pattern coating, coating for forming the stone-like surface, coating for forming the patterned surface or the like.
BACKGROUND ART
Coating finishing has hitherto been performed to protect a substrate of building structures, or civil engineering structures, and to impart design and to improve the appearance. However, a large amount of oily contaminants have recently been floating in the air as a result of an exhaust gas discharged from automobiles in the center of the city and suburbs thereof. When those oily contaminants adhere to the surface of the coat formed by using a high-durability coating, a considerable sooty or striped contamination (hereinafter referred to as “rain-striped contamination”) occurs, therefore, the coating finishing provided to improve the scene of the city was meaningless sometimes.
Japanese Patent Kokai Publication No. 4-370176 discloses a coating comprising a segmented polymer containing a hydrophilic segment such as polyalkylene oxide segment and a hydrophobic segment such as polysiloxane. This coating is capable of obtaining such an effect that water derived from rainfall penetrates/flows into the interface between the coat and contaminants to wash off contaminants together with water (soil release effect) by imparting the hydrophilicity to the coat surface. Although the hydrophilicity is imparted when water is present on the coat surface, the hydrophobicity is actually imparted when the coat surface has no opportunity to contact with water for a long period of time. Therefore, there is a problem that it takes a considerably long time to convert the hydrophobicity of the coat surface into the hydrophilicity during rainfall , so that the contamination during rainfall can not be prevented.
Japanese Patent Application No. 6-506632 (International Publication WO94/06870) discloses an anti-contamination coating composition wherein organosilicate is added in the coating and the coat surface is hydrophilized by the reaction thereof and, furthermore, a soil release effect is utilized. The organosilicate forms a silanol group or a siloxane bond by the hydrolysis reaction in the presence of an acid catalyst, and this silanol group or siloxane bond imparts the hydrophilicity to the coat surface. Taking actual coating on the outside wall of buildings into consideration, the reaction may proceed by acidic rain, but it takes a considerably long period of time after formation of the coat to obtain the hydrophilic surface enough to sufficiently exert the soil release effect, similar to the above technique.
Japanese Patent Kokai Publication No. 6-145453 discloses a method of mixing an acrylic silicone resin with organosilicate to obtain a hydrophilic coat. According to this technique, a large amount of organosilicate is required to impart sufficient hydrophilicity to the coat. However, when a large amount of organosilicate is added, the crosslink density of the coat becomes too large and the coat becomes brittle. At the same time, a large amount of siloxane bonds are introduced to cause deterioration of the chemical resistance of the coat, which results in deterioration of the weathering resistance of the coat as contradiction.
In such a way, among coats formed by using conventional anti-contamination coating, those requiring a long period of time to hydrophilize the surface can cause rain-striped contamination within a very short period of time after application of the coating.
Originally, the anti-contamination coating has the effect of causing no contamination, and users and builders who request the coating expect that effect. Accordingly, the fact that contamination arises even at the initial stage after formation of the coat fails to meet the expectation of these users and builder temporarily, and the fact also imparts a sense of unease to the anti-contamination effect for a long period of time. Since a conventional anti-contamination coating has a main object of washing out contaminants by rainfall, the anti-contamination coating is inferior in stain resistance of once adhered contamination. It has been found that, when there is no rainfall for a long period of time, oily contamination penetrates into the coat to cause contamination which is hardly washed out by rainfall no longer.
An object to be solved by the present invention is to obtain an anti-contamination coating composition for providing an anti-contamination coat, which has a soil release effect of washing out contaminants because the surface exerts the hydrophilicity immediately after formation of the coat, not showing hydrophilicity by an action formed after formation of the coat, such as waterfall, and which is strong but not brittle because of its specific crosslinked structure, and has excellent stain resistance to oily contamination, good weathering resistance and good coat physical properties.
Another object to be solved by the present invention is to provide a coating composition which can improve the interlaminar adhesion (hereinafter referred to as a “recoating property”) when multi-layer coating is performed on a topcoat layer after curing an undercoat layer using a reaction curing type polyurethane or polyurethane-acrylic anti-contamination coating, and effectively prevent blister, crack or lifting (a phenomenon wherein shrinkage occurs on the coat surface as a result of dissolution of the uncured portion of the undercoat layer by a solvent of the coating of the topcoat layer because of insufficient curing and adhesion of the coat of the undercoat layer in case of multiple coating) caused with a lapse of time.
Such an anti-contamination high-durability coating is exclusively a solution type of an organic solvent. With recent enhancement of the environmental awareness, there have been used those using as weak a solvent as possible. Furthermore, it has been required to convert into an aqueous coating.
It is generally considered that, when organosilicate (i.e. alkyl silicate) is added in the coating, it reacts with water in the air during the formation of the coat, and an alkoxysilyl group Si—OR is converted into a silanol group Si—OH and alkyl silicates having a silanol group are arranged on the coat surface, thereby exhibiting the hydrophilicity.
It is assumed that, when using a resin which is only dissolved in a solvent having high dissolving power, since the coat is certainly hydrophilic and the anti-contamination effect can also be obtained, such a surface orientation occurs. When using a urethane resin using a polyol having a solubility parameter of about 6.5 to 9.5, which is also dissolved or dispersed in a solvent having low dissolving power, there arise white turbidity of a film and such phenomenon that the anti-contamination is not obtained. Therefore, there is much room for improvement.
A finishing coating material whose main material layer has rubber elasticity referred to as a waterproofing multi-layer coating material, which is used in coating finishing performed in the case of a substrate of building structures, civil engineering structures, etc., has been noted and widely used because it has a follow-up property to crazing (hereinafter referred to as “crack”) of the outside wall of concrete and an effect for inhibition of penetration of a carbon dioxide gas.
This waterproofing multi-layer coating material is composed of an undercoat layer, a main material (a continuous layer and a patterned layer, which have rubber elasticity) and a topcoat material, but the topcoat layer is coated with an elastic coating follo
Ikeuchi Tadahiko
Ishigaki Kenichi
Kamimura Shigeto
Karuga Hidehito
Kurimoto Kensuke
Sk Kaken Co., Ltd.
Szekely Peter
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
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