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US 7,731,786 B2Granted
Photosensitive dispersion with adjustable viscosity for the deposition of metal on an insulating substrate and use thereof
AssigneeSemika
InventorsOlivier Dupuis, Mary-Helene Delvaux
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Abstract
The invention relates to a photosensitive dispersion with adjustable viscosity for metal deposition on an insulating substrate, which combines the following: a pigment providing oxidation-reduction properties under light irradiation, a metallic salt, a complex-forming agent for the metallic salt, a liquid film-forming polymer formulation, a basic compound, an organic solvent and water. The invention also relates to the use of said dispersion.
Claims27
A method of depositing metal on the surface of an insulating substrate, comprising the steps of:
- (1) applying a dispersion comprising a titanium dioxide conferring properties of oxidation-reduction under light irradiation, a metallic salt supplying metal cation, a sequestering agent for the metallic salt, a liquid film-forming polymeric formulation, a basic compound, an organic solvent and water onto a substrate in the form of a film,
- (2) drying the polymeric film applied to the substrate by evaporating said organic solvent,
- (3) irradiating the polymeric film and the substrate by means of ultraviolet radiation and/or laser with a range of wavelengths between 190 and 450 nm and an energy between 25 mJ/cm2 and 100 mJ/cm2 and forming a semi conductor titanium dioxide,
- (4) oxidizing the film and the substrate by the semiconductor titanium dioxide thereby formed together with reducing a metallic cation of the said metallic salt, and
- (5) forming a layer of metal on the substrate.
2 more elements
Dependencies are inferred from the claim text.