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...
Patent
1996-12-19
1998-05-05
Michl, Paul R.
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...
524276, 524556, C08K 554
Patent
active
057475725
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a releasable aqueous coating composition useful for temporarily protecting a finished coating film on an automobile body and surfaces of other coated products, and to a method of temporarily protecting the finished coating film on the automobile body by use of the coating composition.
BACKGROUND ART
It has widely been carried out to temporarily protect a finished coating film on a product, a surface of which has been coat-finished, for example, a metal product, woodworking product, glass product, plastic product, rubber product or the like as in an automobile, vehicle, mechanical part, domestic article or the like.
For example, developments of scuffs on the finished coating film due to contact with other objects, or of marks, stains, discoloration, pollution and the like due to clouds of sand in air, iron powder, salts, smoking, droppings of birds, humores or carcasses of insects, sunlight, wind and rain, particularly acid rain, and the like during storage in an outdoor stock yard, or during transportation by cars, railways, trailers, ships and the like in such a period of time as from completion to passing into the possession of users of these coat-finished products, reduce commercial values of the coat-finished products. In order to prevent the above reduction in commercial values, the finished coating film is temporarily protected during such a period of time as from completion to passing into the possession of users of the coat-finished product. The following methods 1 to 5 of temporarily protecting the coat-finished product are known in the art, all being unsatisfactory.
1 An aliphatic hydrocarbon based solvent dispersion of waxes is coated. An emulsion prepared by dispersing a cleaning agent into a hydrocarbon solvent or water is used in removing a temporarily coated film. However, the application of the above emulsion to the automobile, for example, results in that anticorrosive agents and anticorrosive waxes coated onto interior parts of doors and hinge parts are simultaneously removed, too, and further that the use of the solvent may cause smelling of the finished coating film, and environmental problems such as danger of fire, waste water treatment and the like.
2 Such a wax-solid powder organic solvent dispersion is coated that the wax is mixed with the solid powder so that strength of a wax film may be reduced and a protecting film may easily be removable by hand-wiping.
The above method has such drawbacks that the protecting film shows poor properties in the temporarily protecting properties, may easily drop by contact with hands, and may easily be polluted by the acid rain.
3 It is known in the art to use an emulsion containing, as a major component, acrylic resin as an aqueous, temporarily protecting agent. Since the above emulsions contain carboxyl group-containing monomers such as acrylic acid, methacrylic acid and the like in a large amount, a resulting film is difficult to be removed and is removed by use of an aqueous alkaline solution, resulting in needing considerable manhours, and in causing problems of waste water disposal etc.
4 For example, the use of an acrylic resin emulsion containing (meth)acrylonitrile as an aqueous, temporarily protecting agent is disclosed in Japanese Patent Application Laid-Open No.259966/91, and a resulting film shows excellent properties in film strength and release properties, but has difficulties in waste disposal of a released film because of containing (meth)acrylonitrile. For example, burying of the released film may cause water pollution, and incineration of the released film may generate hydrogen cyanide gas, resulting atmospheric pollution.
5 For example, the use of a coating composition containing, as a major component, a vinyl acetate emulsion as an aqueous protecting agent is disclosed, in U.S. Pat. No. 5,143,949, but the resulting film shows poor properties in acid resistance, water resistance and the like.
On the other hand, a method of coating the above aqueous, temporarily protect
REFERENCES:
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patent: 5623016 (1997-04-01), Klein
Harakawa Hiromi
Inoue Hiroshi
Kashiwada Seiji
Nakao Fumiaki
Suzuki Kenya
Kansai Paint Co. Ltd.
Michl Paul R.
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