Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1995-11-02
1997-11-11
Brunsman, David
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
1061941, 1061951, 1061981, 1061811, 524300, 524403, 427 98, 4271261, 427304, C23C 1816, C23C 1820, C23C 1828, C08K 1302
Patent
active
056858981
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a polymeric resin of adjustable viscosity and pH for depositing catalytic palladium on substrates, the method for preparing it and use thereof. This is a filing under rule 371 based on PCT/BE94/00099, published as WO95/18879 Jul. 13, 1995.
The objective of the invention is to deposit catalytic palladium in view of metallizing this palladium by means of autocatalytic or electroless baths. Usually, autocatalytic baths are initiated by means of catalysts based on a palladium-tin colloid. In order to achieve a selective deposit by means of this catalyst, use has to be made of photosensibilizers. The substrate pretreated by means of the PdCl.sub.2 catalyst is completely covered with metal by means of autocatalytic baths. Photosensitive resists are coated thereon. Subsequently, the whole is irradiated with ultraviolet light through a mask. The development of the irradiated resist results in the circuit pattern. To reduce the number of chemical processing steps, a large number of processes have been proposed for selectively depositing palladium. However, all of these processes show a certain number of drawbacks from the point of view of both the stability of the palladium product and the number of steps and the flexibility of applying said product.
In this respect, K. Kondo et al. have proposed in their article "Photochemical Deposition of Pd(0) from Adsorbed Pd(II)-Complex Ions", J Electrochem. Soc., Volume 139, No.10, October 1992, a palladium sensibilizer allowing to metallize selectively ceramic products, and more particularly 96% alumina. This product is prepared by mixing palladium chloride (PdCl.sub.2) and a ligand such as tartaric acid in water, in a molar ratio of 5. The pH of this system is subsequently adjusted to 9.3 by addition of sodium hydroxide. The alumina plates are then immersed in the solution for ten minutes and for three minutes in deionised water. Then they are dried at room temperature. Thereafter, the plates are irradiated through a mask for six minutes with a mercury vapour lamp, the surplus of non-irradiated product being removed by immersing the substrate for five minutes in a hydrochloric acid solution at 60.degree. C. Subsequently, they are selectively plated with copper, according to the mask pattern, by means of autocatalytic copper baths. The main drawback of the thus obtained sensibilizing palladium solution is its lack of stability in time. It will also be noticed that the number of steps for applying the solution is still large and that insolation through a mask is obligatory and is the only useful method for applying the product. The other major drawback is that the products of Kondo can not be considered either as resin (they do not contain polymers) but rather as solutions, nor as products of adjustable viscosity. In fact, applying the solutions of Kondo can only be done by adsorption on the substrate.
Applicant's patent application WO93/12267 relates also to a polymeric resin for depositing metal on substrates, comprising a coordination compound and a cellulose derivative, in solution in dimethylformamide or water as solvent in function of the nature of the cellulose derivative and the metal compound. Major drawbacks resulting from the use of these polymeric resins are the fact that they are not suited for certain polymeric substrates such as polyvinyl chloride, polycarbonate, polyamide, that use thereof with ultraviolet lamps is very limited because they only decompose with high power lamps at 254 nm and that their viscosity is only adjustable within a smaller range. Moreover, the means for applying these resins are limited. Ink jet for example can not be used. Further, no additions are possible.
One of the essential objects of the present invention consists consequently in obviating the above mentioned drawbacks and to present a polymeric resin of adjustable viscosity and pH for depositing catalytic palladium on a substrate, which is extremely stable in time, which can be used with a large number of application techniques such as by means
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Delvaux Mary-Helene
Dufour Pascale
Dupuis Olivier
Fernandez Marie-Carmen Malerno
Sendrowicz Henri
Blue Chips Holding
Brunsman David
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