Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1995-12-21
1998-05-05
Niland, Patrick
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
156320, 1563314, 1563317, 4272082, 4273722, 4273855, 4273881, 4273897, 524589, 525440, 525457, C08J 300, C08K 320, C08L 7800, B65C 925
Patent
active
057475814
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to adhesive and sealing masses with very good stability and high initial carrying capacity, and their use for the gluing of materials and components in metal and car body construction, for example in direct glazing of automobile windows. The invention is described in the following with reference to this use, but is not restricted to it, being suitable for the gluing of components made of the same material or different materials.
Polyurethane adhesive and sealing materials play since several years a significant role in numerous technical applications. Their high elasticity, combined with excellent tensile strength and resistance to tearing, their broad adhesive range with and without primer, as well as their advantageous price/performance ratio, allow them to appear particularly suitable for the automobile industry. Thus, it has become accepted to use PU materials in particular even for directly glazing vehicle windows. Pasty, highly-viscous adhesive and sealing masses are used for these applications, which normally are deposited on the car body flange or glass pane by robots. Most of these products consist of one component and harden over the course of a few hours to a few days by the reaction of the isocyanate groups, optionally capped, contained therein with penetrating atmospheric moisture to produce a high-grade elastomer.
2. Discussion of Related Art
It is a disadvantage of the single-component adhesive and sealing masses known up until now that, for the adhesive composite to reach a certain minimum strength, a period of at least 1 to 2 hours must elapse. As a rule, therefore, fixing agents must be used for inserting the panes in order to prevent them slipping out during subsequent assembly work. Numerous processes have been described which attempt to remedy this failing. For example, using two-component materials as are described in EP-A-153 456 or EP-A-281 905, a hardening is achieved which is, as a rule, faster and independent of the atmospheric moisture. It is, however, a disadvantage for the users of this system that they are more difficult to master with regard to apparatus, and that, because of the presence of two components, mixing and dosage errors can arise.
It was also attempted in the case of the 1-C materials to obtain a faster strength build-up during the initial phase of hardening. This is achieved, for example, by using special accelerators, as is described in EP-A-312 012, EP-A-370 164 or U.S. Pat. No. 4,780,520, or by other chemical activation, e.g. by injecting an activator or treating with steam, as is shown in EP-A-351 728 or DE-A-39 09 127. It is not, however, possible to achieve with this process an effective adhesion and fixing directly after applying the sealing material bead, which, for example, prevent the glued pane from slipping out within the first few minutes during direct glazing. A further disadvantage of the systems cited in EP-A-312 012 and EP-A-370 164 and U.S. Pat. No. 4,780,520, which contain very active catalysts, is a relatively short shelf-life.
A further developmental direction forming part of the prior art deals with reactive hot melts, like those described e.g. in EP-A-244 608, EP-A-310 704, EP-A-340 906, EP-A-369 607 and EP-A-455 400, or with pre-crosslinking systems, as described in EP-A-255 572 and DE-A-40 23 804. Common to these processes, useful per se, is the disadvantage that the adhesive sealing material has to be applied at rather high temperatures (at least 80.degree. C). With the great majority of these moisture-hardening hot melt materials, the moisture-hardening is very slow because of the severely impeded diffusion of the atmospheric moisture. These adhesive compositions must therefore achieve a considerable part of their strength by the liquid/solid phase transition during cooling. For this reason these adhesive/sealing materials already display a very high viscosity increase directly after application, which makes the insertion of the panes into the car-body
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Proebster Manfred
Schumann Manfred
Grandmaison Real J.
Jaeschke Wayne C.
Niland Patrick
Szoke Ernest G.
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