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
1995-10-19
1998-10-13
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...
524501, 524507, 524515, 524521, 524522, 524523, 524839, 524840, 524296, 524297, 524563, 525123, 525125, 525440, 525455, C08J 300, C08K 320, C08L 7500
Patent
active
058212973
DESCRIPTION:
BRIEF SUMMARY
For laminating carrier substrates with textiles, films and other flexible plane, i.e. flat materials, two-component adhesives based on non-aqueous solvents have been in use for a long time. Aqueous dispersion adhesives, however, are also well known for a very long time, which serve to replace such solvent-based adhesives. In the automotive industry in the production of dashboards and other interior parts, for example, PVC films are laminated onto absorbent carriers like e.g. particle boards with such aqueous two-component dispersions. Polyurethane-modified dispersion are most frequently used as they are especially heat-resistant. In these adhesives an aqueous dispersion, containing at least one hydroxyl group containing polymer compound and besides color and other additives is mixed with a hardener that is dispersible in water, comprising a di- or polyfunctional isocyanate. The dispersion is then applied to the substrate to be bonded (most commonly sprayed on) and after evaporating, reactivated by heat which allows bonding to the other substrate of the laminated part by simple pressing.
The dispersion does not always have to contain two components and can of course contain several hydroxyl containing polymer compounds beside each other.
It is already known, to change polyurethane dispersions by adding other polymers to become dispersions, as the polyurethane component is fairly expensive and pure polyurethane dispersions are difficult to be applied by spraying. Sprayability can be improved by adding ethylene vinylacetate (EVA) copolymers to the dispersion. Heat resistance of the bondings however decreases significantly. It is also common knowledge to add acrylates to the polyurethane dispersion. This, however causes problems when bonding material with a high plasticizer content like e.g. PVC films frequently used in the automotive and furniture industry, as the plasticizer compounds tend to creep from the substrate into the bonding seam, which significantly reduces the bonding strength of the bonding seam.
The required features and characteristics of all such adhesives is the suitability for application by spraying, low reactivation temperatures, long potlife and after curing, high heat resistance and resistance against plasticizers contained in the substrate.
None of the afore mentioned, well-known adhesives completely fulfills all these requirements.
A disadvantage of the common two-component polyurethane-modified dispersion is that they do not totally feature the characteristics of the solvent-based two-component polyurethane adhesives they were designed to replace. Especially initial tack and heat resistance of the bondings as well as potlife of the dispersions after having added the hardener are significantly worse than those of products based on non-aqueous solvents. Particularly disadvantageous in industrial multiple shift operation is the extremely short potlife leading to frequent interruptions of the production cycle due to necessary cleaning work.
Considering this background, it is the basic task of this invention to create improved laminating dispersions featuring improved long-time heat resistance and longer potlives so that uninterrupted work is at least possible in two-shift operation.
Basic task of this invention is to specify improved laminating dispersions featuring low percentage of polyurethane and allow a resulting saving of costs without having to do without the advantages of common polyurethane-modified dispersions.
Another main task of the invention is the creation of improved laminating dispersions which feature higher resistance against the plasticizer components in the substrate
It was found, surprisingly enough, that the resistance of bondings made with dispersions of the previously mentioned kind against plasticizer components from the substrate can be improved by adding plasticizer to the dispersion before starting the bonding process. This surprising result is achieved not only for polyurethane-modified two-or multiple-component dispersions but also for dispersions based on E
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Odian. G., Principles of Polymerization, 1981, pp. 20-25 and 279-281.
Arnold Christian W.
Pimpl Werner H.
H. B. Fuller Licensing & Financing Inc.
Niland Patrick
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