Stock material or miscellaneous articles – All metal or with adjacent metals – Having member which crosses the plane of another member
Reexamination Certificate
1994-02-23
2001-06-05
Gorgos, Kathryn (Department: 1741)
Stock material or miscellaneous articles
All metal or with adjacent metals
Having member which crosses the plane of another member
C205S149000, C205S196000, C205S224000, C205S305000, C428S623000, C428S626000, C428S658000, C428S659000
Reexamination Certificate
active
06242105
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the processes for covering metallic parts or structures with a coating consisting of a thermosetting powder, having a base of polyester or epoxy resin or a mixture of the two, as well as the metallic products thus coated.
BACKGROUND OF THE INVENTION
The addition of such a coating has in particular as its object to improve the esthetic appearance of the corresponding parts and to assure their protection against the dangers of corrosion. For this double purpose, it is common to provide such a coating on many metallic parts or structures, for example on supermarket carts, carrying baskets, shelving elements . . . . The application of the coating thus provided is performed by spraying of the thermosetting powder, with an electrostatic spray gun, on the parts to be covered, then passing of the latter through a furnace heated to a temperature on the order of 220° C. to assure the polymerization of the coating.
However, the coating thus applied has the drawback of exhibiting an insufficient resistance against impacts as well as to abrasion. Here, therefore, it is a particularly bothersome drawback when such a coating is provided on objects that can undergo impacts or friction as is the case, for example, for supermarket carts, carrying baskets, etc.
Furthermore, this type of coating exhibits an insufficient resistance against the dangers of corrosion under the action of chemical products or even simply of atmospheric agents.
SUMMARY OF THE INVENTION
For the above reasons, the present invention has an object a process for covering metallic parts or structures which is designed so as to improve appreciably the conditions for adherence of the coating of the type in question and consequently its resistance to impacts and its resistance to abrasion.
For this purpose, this process is characterized in that before the spraying of the thermosetting powder intended to constitute the external coating, the following two operations are performed successively on the parts to be covered:
a) initial zinc coating treatment for electrolytic process,
b) application of a layer of a paint, then after drying or baking or polymerization of this coating of paint, this intermediate coating being able to serve as a bonding sublayer between the metal and the external coating having a base of polyester resin, epoxy resin, or a mixture of the two.
According to other characteristics of the invention:
the thickness of the coating is between 2 and 30 micrometers and preferably between 5 and 25 micrometers,
the application of the layer of an acrylic paint is performed by dipping, by dipping of the parts in a bath of said paint,
the application of the layer of an acrylic paint is performed by spraying,
the polymerization of the acrylic paint is performed in a furnace.
The invention also has as its object a metallic product, particularly assembled by welding of wires, coated by a coating process.
REFERENCES:
patent: 3891471 (1975-06-01), Summers et al.
patent: 3953644 (1976-04-01), Camelon et al.
patent: 4251582 (1981-02-01), Bernier et al.
patent: 4401523 (1983-08-01), Avellone
patent: 4407899 (1983-10-01), Hara et al.
patent: 4541903 (1985-09-01), Kyono et al.
patent: 2 696 371 (1994-04-01), None
H. Silman et al,Protective and Decorative Coatings for Metals, Finishing Publications Ltd., Teddington, Middlesex, England, 1978, Month of publication not available, pp 416-435.
Joseph Alice
Le Marchand Alain
Rollin Pierre-Noël
Ateliers Reunis Caddie
Gorgos Kathryn
Leader William T.
Pennie & Edmonds LLP
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