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
2001-04-19
2003-11-25
Wu, David W. (Department: 1713)
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...
C524S432000, C524S502000, C524S520000, C442S059000, C442S081000, C525S057000
Reexamination Certificate
active
06653393
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a paintwork coating composition and to a coating cloth and, more particularly, to a paintwork coating composition to coat a paintwork in a vehicle and the like and to a coating cloth.
2. Description of Background Art
Car waxes have been widely used for coating a paintwork in a vehicle. Usually, the car wax comprises a mixture of a wax component to protect and polish a paintwork in a vehicle and a silicone oil to provide a water-repellent property to the paintwork. A variety of car waxes having various properties are known, including cake, paste-form wax and liquid-form wax.
Some car waxes use a wax component that is subjected to fouling, depending on its composition and content. For improvement in antifouling of a paintwork, for example, Japanese Patent Publication No. Hei 6(1994)-13,663 proposed a coating treatment comprising 1-50 weight % of low molecular weight polytetrafluoroethylene having a molecular weight of 1,000 to 100,000 and 0.1-25 weight % of perfluoropolyether.
Fluorochemical wax is superior to silicon wax in antifouling property of the coated paintwork. In view of this, for example, Japanese Laid-open (Unexamined) Patent Publication No. Hei 5 (1993)-130,963 proposed a car wax-applying wet sheet comprising a non-woven fabric sheet wetted by a fluorochemical wax.
Meanwhile, in recent years, the so-called dry bright type of car waxes requiring no wiping of wax after applied to the paintwork are becoming widely used. Since the dry bright type of car wax requires no wiping of wax, it has the advantage that the waxing can be done in a simple work and in a short time.
The coating treatment disclosed by Japanese Patent Publication No. Hei 6(1994)-13,663 cited above uses an organic solvent, such as naphtha for industrial use, as dispersion solvent of polytetrafluoroethylene and perfluoropolyether, as referred to in the examples, and as such is not really desirable for the environments and the humans.
With this coating treatment, when the wax is applied to the paintwork, the quantity of adherence of wax to the paintwork per quantity of wax applied thereto is small. Accordingly, a large quantity of wax is practically required for the application of the wax to the paintwork and, after the waxing, the wiping of the wax is required. Consequently, it is difficult to apply this coating treatment to the dry bright type of wax requiring a small quantity of wax and requiring no wiping of the wax.
Further, the fluorochemical wax has a good antifouling property of the coating of paintwork, but even the fluorochemical wax having the same components may fail to form a good coating on the paintwork, depending upon the type of cloth used, so that the water-repellent property and the antifouling property may reduce.
In the dry bright type wax, in particular, the cloth used reflects on the waxing performance significantly, because a small quantity of wax is applied to the paintwork and also there is a need to eliminate the wiping of the wax after the application of wax.
It is an object of the invention to provide a paintwork coating composition that is harmless to the environments and humans and enables the paintwork to be fully coated by the application of only a small quantity of coating composition. It is another object of the invention to provide a coating cloth that provides a smooth rubbing work in the coating process and can develop a good water-repellent property and a good antifouling property.
SUMMARY OF THE INVENTION
The present invention provides a novel paintwork coating composition comprising water dispersion comprising polytetrafuluoroethylene and perfluoropolyether.
According to the paintwork coating composition of the present invention, the quantity of adherence of the coating composition to the paintwork per quantity of coating composition applied thereto is large. Therefore, the coating composition of the present invention can suitably be used as the coating composition of the dry bright type requiring no wipe after a small quantity of coating composition is rubbed thereon. Further, since the paintwork coating composition of the present invention is water dispersion, good working conditions harmless to environments and humans can be ensured. Thus, the coating composition of the present invention is harmless to the environments and humans and also can be effectively used as the non-wipe coating composition for simplifying the coating work and finishing it in a short time.
In the paintwork coating composition of the present invention, it is preferable that the water dispersion of polytetrafluoroethylene and the water dispersion of perfluoropolyether are mixed.
In the paintwork coating composition of the present invention, it is preferable that the content of polytetrafluoroethylene is not more than 0.8 weight % per total quantity of paintwork coating composition.
In the paint coating composition of the present invention, it is preferable that a hydrophilic organic modified silicone oil is further mixed. It is preferable that the hydrophilic organic modified silicone oil is polyether modified silicone oil.
In the paintwork coating composition of the present invention, it is preferable that ion cross-linked organic acids is further mixed as a thickening agent.
The present invention provides a novel coating cloth wherein a coating composition comprising polytetrafluoroethylene and perfluoropolyether is impregnated in a cloth having a basis weight of 30-300 g/m
2
and a density of 0.02-0.3 g/cm
3
under load condition of 1.961 KPa.
According to the coating cloth of the present invention, the smooth rubbing work in the coating process can be ensured and also the coating having little unevenness can be formed on the paintwork, so that the good water-repellent property and the good antifouling property are developed. Particularly, when the coating composition is impregnated in the cloth in the form of water dispersion, polytetrafluoroethylene and perfluoropolyether are stably dispersed in water before the rubbing of the coating composition, while, once the coating composition is rubbed over the paintwork, they are allowed to adequately adhere to the paintwork by the rubbing force and are hardly reverted into water. Consequently, the quantity of adherence of the coating composition to the paintwork per quantity of coating composition applied thereto is large. Therefore, the coating cloth of the present invention can suitably be used as the coating cloth of the dry bright type requiring no wipe after a small quantity of coating composition is rubbed thereon. Further, the cloth impregnated with the coating composition can dispense with the organic solvent, so good working conditions for environments and humans can be ensured.
In the coating cloth of the present invention, it is preferable that the coating composition is water dispersion comprising polytetrafluoroethylene and perfluoropolyether. Also, it is preferable that the content of polytetrafluoroethylene in the coating composition is not more than 0.8 weight %.
In the coating cloth of the present invention, it is preferable that a hydrophilic organic modified silicone oil, or polyether modified silicone oil, in particular, is further mixed in the coating composition. Also, it is preferable that ion cross-linked organic acids is further mixed in the coating composition as a thickening agent.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
A paintwork coating composition of the present invention (hereinafter it is simply referred to as “the coating composition”, which is equivalent to “the paintwork coating composition”, unless otherwise specified.) comprises water dispersion comprising polytetrafluoroethylene and perfluoropolyether.
Polytetrafluoroethylene (hereinafter it is sometimes abbreviated to PTFE) can be produced, for example, by polymerizing tetraethylene fluoride in a known manner. Polytetrafluoroethylene having a number average molecular weight of 1,000 to 1,000,000 or preferably of 3,000 to 500,000 is preferably used. Polytetraflu
Hidaka Ryutaro
Ishii Makoto
Nonaka Jun-ichi
Hu Henry
Kilpatrick & Stockton LLP
Marcou George T.
Soft99 Corporation
Wu David W.
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