Stock material or miscellaneous articles – Composite – Of metal
Patent
1996-07-03
1998-11-03
Lusignan, Michael
Stock material or miscellaneous articles
Composite
Of metal
204471, 204492, 427435, 428339, B32B 1508, B32B 2700
Patent
active
058305807
ABSTRACT:
The present invention relates to a painted sheet metal part, such as a car body, with a polyacid layer between the coat of paint and the surface of the sheet metal part and to a method for applying such a coating on the part before painting. Initially, the part is cleaned and de-greased, and subsequently the polyacid layer is deposited and stabilized. In order to be able to apply this layer without losing wet adhesion qualities of the coat of paint and the anti-corrosive effect of coating layer, while presenting fewer ecological disadvantages or harmful consequences, polyacids, which comprise homopolymers or copolymers of carboxylic acids containing double bonds or of functional esters of carboxylic esters, or copolymers of carboxylic acids with vinyl compounds, are used pursuant to the present invention as the protective bonding layer. The polyacids used are further combined with polymers having a glass transition temperature above 100.degree. C., such as phenolic resins, urea resins or epoxy resins, and/or with low molecular carboxylic acids with 2 to 30 carbon atoms in the carbon chain, in order to increase the corrosion protection effect. The deposited anti-corrosion layer is stabilized by thermal curing at about 100.degree. to 150.degree. C. The polymers of the corrosion inhibitor layer can be crosslinked intermolecularly, intramolecularly or with the adjacent paint layer with functional groups which are not absorbed by the substrate.
REFERENCES:
patent: 4362770 (1982-12-01), Mathai et al.
patent: 5552227 (1996-09-01), Goldner
patent: 5589228 (1996-12-01), Wagner et al.
patent: 5601880 (1997-02-01), Schwartz et al.
Abstract of Published Japanese Patent Application No. JP 95-290628.
R.A. Dickie "Paint Adhesionl Corrosion Protection, and Interfacial Chemistry" Progress in Organic Coatings, 25 (1994) pp. 3-22.
X.H. Jin et al "The Effect of Environmental Conditions of the Adhesion of Paints to Metal" pp. 78-81, 1988.
Flammer Ute
Funke Werner
Keller Anja
Mezger Fritz
Lusignan Michael
Mercedes - Benz AG
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