Cleaning and liquid contact with solids – Processes – Including forming a solidified or hardened coating for cleaning
Reexamination Certificate
1998-10-29
2001-02-06
El-Arini, Zeinab (Department: 1746)
Cleaning and liquid contact with solids
Processes
Including forming a solidified or hardened coating for cleaning
C134S038000, C510S174000
Reexamination Certificate
active
06183567
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a novel method for removing graffiti written on a surface of a structure, that is, for example, on an outer surface of a road structure such as a bridge pier, a girder, or the like, on an inner surface of a tunnel, on an inner or outer surface of a building, on a surface of an equipment incidental to a road such as a pole, a guard-rail, or the like, etc.
Impudent persons may often write graffiti on a surface of a structure. Generally, graffiti may be written with lacquer spray or oil marker.
Wiping off graffiti with a piece of cloth impregnated with a paint thinner is one method for removing graffiti. Much labor and time are, however, required for the work of wiping off graffiti. Furthermore, it is very difficult to wipe off graffiti thoroughly. In addition, in the work of wiping off graffiti, there is a risk that the surface layer may be injured.
Recently, therefore, there has been proposed a method in which a graffiti-resistant coating composition is applied in advance onto a surface of a base material of a structure to form a surface layer so that graffiti can be hardly written on the surface layer or graffiti can be wiped off easily even in the case where graffiti are written on the surface layer (for example, as disclosed in JP-A-5-33142, JP-A-8-151540 and JP-A-9-100445).
By such a proposed method, however, it is still difficult to remove graffiti thoroughly so that graffiti may remain on the surface layer. If graffiti remain, the work of wiping off graffiti or the like, is required after all. This work is not easy as described above. Furthermore, there arises a problem that the surface layer may be injured.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a graffiti removing method using a novel idea instead of the conventional idea of wiping off graffiti.
In order to achieve the above object, according to the present invention, provided is a graffiti removing method comprising the steps of: applying a solvent condensation type silicone resin coating composition having water repellency onto a surface of a base material of a structure through a primer layer to form an adhesion-resistant surface layer on the primer layer; applying a releasable coating composition onto the surface layer to form a releasable layer, after graffiti are written onto the surface layer; and releasing the releasable layer from the surface layer after the releasable layer is hardened to thereby remove the graffiti together with the releasable layer from the surface of the surface layer.
In the method, preferably, the releasable coating composition exhibits physical properties of an extensibility not smaller than 100% at 20° C. and a tensile strength not smaller than 100 kg/cm
2
at 20° C. after the releasable coating composition is hardened. Incidentally, it is a matter of course that the physical properties of the releasable coating composition is not limited to the above-mentioned values.
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Kamijo Tatsuyuki
Miyasato Katsuyuki
Tateno Hideo
Bacon & Thomas
El-Arini Zeinab
Sho-Bond Corporation
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