Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-01-15
2000-02-15
Dawson, Robert
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
428418, 525119, 525530, 525533, C08F 814
Patent
active
060254386
DESCRIPTION:
BRIEF SUMMARY
The invention relates to thermosetting coating compositions for treating surfaces consisting of different materials with a multifunctional, corrosion-, abrasion- and wear-resistant film or layer of adhesive which is tack-free at temperatures <80.degree. C. and can be activated by means of energy.
Fastening elements which can be used to hold and/or fasten constructional and functional components on supporting substrates are adequately known. To fasten them to supporting substrates, use is preferably made of joining techniques having a mechanical and/or physical action, with all of the disadvantages associated therewith.
In the course of producing a mechanically effective fastening, the support materials are damaged by the making of punch holes and/or drill holes. In order, then, to ensure the same load-bearing capacity of the damaged material, it must be made thicker, which is often technically impracticable and uneconomical.
The physical joining techniques, on the other hand, are based preferably on various types of welding and soldering, requiring operation at very high temperatures. In the field of fastening, the physical joining methods can only be employed when the materials to be united possess sufficiently high and good properties of electrical and/or thermal conductivity. In principle, this is only the case with metal material combinations.
Despite an extremely high level of development in application, in the field of joining and fastening an economic advantage is provided by welding and soldering only, primarily, since it is possible to fasten elements with short cycle times. From a technical and quality standpoint, however, it is the disadvantages which predominate in the case of the physical joining techniques, and, moreover, they have an adverse effect on the mercantile results. Depending on the particular techniques and on the metal material combinations, these disadvantages are, inter alia, as follows: its vicinity as a result of heating; some of which stresses may lead to cracks; different materials fastening elements.
These and other disadvantages are in a causal relationship with the appearance of corrosion sources and/or possible instances of damage to the anticorrosion layers present on the metal material combinations following the use of mechanical and/or physical joining methods. These sources of corrosion risk can be reduced or eliminated only by means of time-consuming and cost-intensive reworking, assuming they are recognized. In addition, such combinations of materials are subject to even greater restrictions when these conventional joining techniques are employed, which in turn have an adverse economic effect.
In the processing of thermoplastics, welding is likewise used to produce simple bonds. For fastening, however, physical joining methods are of no importance in the joining of thermoplastic material combinations, since thermoplastics possess a series of adverse properties, such as creeps, low thermal stability and, possibly, the migration of plasticizing ingredients, for example.
In recent years there has been no lack of efforts in the field of fastening to eliminate the disadvantages of the mechanical and/or physical joining methods by means of conventional adhesive technology. In a few areas, these efforts have led to partial success; in other words, the fastening elements have been bonded to a substrate by means of physically or chemically setting adhesives, for which purpose customary commercial products have been employed.
In a few specific applications such adhesive fastenings may indeed be useful; however, they are unsuitable for a production system incorporating adhesive bonding and fastening. This is because the conventional adhesive systems possess a large number of disadvantages in this respect, including the following: solvent-containing, physically setting adhesive systems backbone binders, including the physically setting hot-melt adhesives.
Even by means of physically setting and moisture-curing hot-melt adhesives it is not possible to obtain any satisfactory
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Form PCT/ISA/210 for PCT/EP 95/00864.
Bottcher Axel
Grundke Ullrich
Hinterwaldner Rudolf
Lesser Hans-Jurgen
Liebetanz Klaus-Peter
A. Raymond & Cie
Aylward D.
Dawson Robert
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