Coating processes – Removable protective coating applied – Metal base
Patent
1996-04-22
1998-02-10
Hoke, Veronica P.
Coating processes
Removable protective coating applied
Metal base
4273884, 524 94, 524 99, 524102, 524227, 524228, 524229, 524336, C08K 534, B05D 302
Patent
active
057166676
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of protecting a finished coating film on an automobile body, which method is useful for temporarily protecting the finished coating film on the automobile body with a releasable aqueous coating composition.
BACKGROUND OF THE INVENTION
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 possesion 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 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 strongth 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, Japanese Patent Application Laid-Open No. 259966/91 discloses the use of an acrylic resin emulsion containing (meth)acrylonitrile as an aqueous, temporarily protecting agent, 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, U.S. Pat. No. 5,143,949 specification discloses the use of a coating composition containing, as a major component, a vinyl acetate emulsion as an aqueous protecting agent, but the resulting film shows poor properties in acid resistance, water resistance and the like.
As above described, in the case where the temporarily protecting agent is used, it is important to use a composition having the following p
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Inoue Hiroshi
Kashiwada Seiji
Suzuki Kenya
Takahashi Shouji
Hoke Veronica P.
Kansai Paint Co. Ltd.
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