Coating processes – With post-treatment of coating or coating material – Chemical agent applied to treat coating
Patent
1997-07-29
1998-12-08
Cameron, Erma
Coating processes
With post-treatment of coating or coating material
Chemical agent applied to treat coating
427341, 427404, 427405, B05D 138, B05D 304, B05D 310
Patent
active
058466061
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/EP96/05220, filed Nov. 29, 1996 which was designated in the U.S.
The invention relates to a process for the production of metallized materials and in particular to such a process in which the desired metal is deposited on the material in a non-electrochemical manner.
Applying metal layers to non-conductive materials or conductive materials, such as metals, is a technique necessary in many branches of industry and practised in very different variants. The aim of this treatment is in particular to obtain antistatic or conductive surfaces or to make available an electromagnetic shielding. Furthermore, metallizing can serve to achieve a desired optical effect, such as a metallic "look", or to obtain improved or more abrasion-resistant surfaces. Finally, the metallization of material surfaces is also of great importance in the production of printed circuit boards.
In order to carry out the metallization, i.e. applying the metal to the material, non-electrochemical processes, which are also called chemical deposition processes, are also known in addition to electrochemical processes. A suitable surface treatment of the material generally precedes such chemical processes, and they are known for various metals such as Au, Ag, Pd, Cu, Sn or Ni. Electrochemical methods are often additionally used after prior chemical metallization, in order to increase the layer thickness of the applied metals.
In various applications, however, the known chemical processes result in the applied metal layers or the metallized materials having inadequate properties. The layers obtained are often only irregularly structured or they exhibit inadequate elasticity or they are too brittle. Furthermore, the known processes are not very efficient, since they often require the use of large quantities of mostly toxic chemicals.
The object of the invention is therefore to provide a non-electrochemical process for the production of metallized materials, which is superior to the known processes with regard to the above-mentioned aspects.
This object is surprisingly achieved by the process of the invention according to claims 1 to 10.
Moreover, the invention relates to the use of intrinsically conductive polymers in the non-electrochemical application of metals to materials.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates the results from the practice of the present invention.
FIG. 2 illustrates the results from the practice according to the prior art .
The process according to the invention for the production of metallized materials is characterized in that intrinsically conductive polymer, bringing the coated material into contact with a solution containing ions of the metal.
"Intrinsically conductive polymers" used in the process are understood to be those organic polymers which have polyconjugated bonding systems, e.g. double bonds, aromatic or heteroaromatic rings or triple bonds. Examples of such polymers are polydiacetylene, polyacetylene (PAc), polypyrrole (PPy), polyaniline (PAni), polythiophene (PTh), polyisothianaphthene (PITN), polyheteroarylene vinylene (PArV), in which the heteroarylene group can be e.g. thiophene or pyrrole, poly-p-phenylene (PpP), polyphenylene sulphide (PPS), polyperinaphthalene (PPN), polyphthalocyanine (PPhc) and their derivatives (which are formed e.g. of substituted monomers), their copolymers and their physical mixtures. They can exist in various states, which are described by empirical formulae differing in each case and can be converted into one another, in most cases essentially reversibly, by reactions such as oxidation, reduction, acid/base reaction or complexation. These reactions are sometimes also called "doping" or "compensation" in the literature. At least one of the possible states is electrically very conductive, e.g. having a conductivity of more than 1 S/cm (as pure substance), so that it is possible to refer to them as intrinsically conductive polymers. From time to time, the intrinsically conductive polymers are al
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Cameron Erma
Zipperling Kessler & Co. (GmbH&Co.)
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