Coating for decorative metals with improved mar and scratch resistance and methods of application
a technology of decorative metals and coatings, applied in the field of decorative metal coatings, can solve problems such as poor mar and scratch resistan
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example a
Polysiloxane
[0074]This example describes the preparation of polysiloxane polyol, a product of the hydrosilylation of polysiloxane with an approximate degree of polymerization of 3 to 4, i.e. (Si—O)3 to (Si—O)4. The polysiloxane polyol was prepared as follows:
[0075]To a suitable reaction vessel equipped with a means for maintaining a nitrogen blanket, was added 1032.0 kg of trimethylolpropane monoallyl ether and 84.4 g of anhydrous sodium acetate. The mixture was sparged with nitrogen for 20 minutes with stirring at room temperature, and a solution of chloroplatinic acid (29.1 g in 570.0 g of isopropanol) was added, followed by 952.5 g of toluene. The mixture was heated to 80° C., and 680.4 kg of MASILWAX BASE 135 (polysiloxane containing silicon hydride, available from Emerald Performance Materials) was added over 5 hours and 30 minutes. The temperature was maintained at 80° C. until the silicon hydride peak at 2150 cm−1 in the infrared spectrum was no longer observable.
example b
Silica Dispersion
[0076]This Example describes a colloidal silica dispersion prepared as follows:
[0077]A suitable reaction vessel equipped for vacuum distillation was flushed with N2. To the reaction flask was added 236.3 g of the polysiloxane polyol of Example A, 337.2 g of ORGANOSILICASOL MT-ST (colloidal silica available from Nissan Chemicals), and 129.4 g of methyl amyl ketone. The resulting mixture was vacuum distilled at 25° C. until 212.1 g of solvent had been removed. The mixture was heated to 40° C. for 2 hours, and then to 60° C. for an additional 2 hours. To the reaction flask was added 90.2 g of 4-methylhexahydrophthalic anhydride over 30 minutes. After completion of this addition, the mixture was heated to 90° C. When the anhydride peak at 1790 cm−1 in the infrared spectrum was no longer observable, 175.9 g of CARDURA E-10 (neodecanoic acid glycidyl ester) was added over 2 hours. After the first 10 minutes of the addition, 0.75 g of benzyldimethylamine was added to the r...
example i
[0078]The colloidal silica dispersion of Example B was used to modify a cationic electrodepositable clear coating composition available from PPG Industries as ELECTROCLEAR 2700. The amino group-containing acrylic polymer and aminoplast curing agent were mixed with the silica dispersion of Example B. Lactic acid was added to the mixture to partially neutralize the amino group-containing acrylic polymer (70% TN) and the mixture dispersed in water to a 30% solids content. For use in an electrodeposition bath, the dispersions were further thinned with water to a solids content of fifteen (15) percent by weight.
[0079]Reference is made to the Fig., where it can be seen that the concentration of colloidal silica particles is greater at the surface 2 of the cured coating than in the bulk region. In other words, the concentration of the colloidal silica particles in the region extending from the exposed air-surface interface to a depth of 20 to 50 nanometers is greater than the concentration...
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