Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1998-02-17
1999-11-02
Gorr, Rachel
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
1563317, 264134, 264510, 4273855, 427391, 526301, C08G 1804
Patent
active
059763043
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a coating system comprised of a resin component, a hardener component, and additives, and its use in the preparation of laminated pressed plates with a surface coating consisting essentially of polyurethane acrylates.
2. Description of the Related Art
The use of laminated pressed plates for indoor and outdoor applications in the construction sector is known, where the surface of the plates must meet high requirements with regard to mechanical properties such as surface hardness and scratch resistance. In the case of laminated pressed plates for outdoor applications, high requirements are also imposed regarding resistance to UV radiation and weathering.
According to EP-A-166653, a laminated pressed plate with improved scratch resistance, namely at least 2 newtons, is provided which has on the surface of its plates an acrylic resin layer that has been cured by radiation. To manufacture these plates, the outermost web of the carrier material, e.g., a web of printed decorative paper, is coated on one side with polymerizable acrylic resins so that a solid resin film is created. Then this film is exposed at room temperature to electron beams, causing a radical cross-linking reaction to occur. Finally, this cross-linked acrylic resin film forming the outermost layer is pressed at high pressure and temperature in a pressing stack of the type customarily used for laminated pressed plates.
This method is tedious from the standpoint of machine technology inasmuch as an electron radiation source with a relatively complicated type of construction is required in order to achieve the desired surface hardness of the acrylic resin layer.
In addition, the cross-linked acrylic resin film is difficult to manipulate in discontinuous pressing processes inasmuch as it tends to curl easily and not lie flat when the pressing stack is being loaded in layers. This effect is based on a radiation polymerization induced high acrylate cross-linking density, which is in turn associated with material shrinkage of the acrylate polymers.
The invention is intended to remedy this problem.
SUMMARY OF THE INVENTION
The task underlying the invention is to provide a coating system of the type described above with which it is possible, in a process that can be easily carried out, to coat carrier materials and to press them using the type of pressing stack customarily used for laminated pressed plates, so that a weather-resistant surface coating with satisfactory surface hardness and scratch resistance is formed.
According to the invention, a coating system comprised of a resin component and a hardener component and additives is proposed which is characterized by the fact that the resin component contains not only free, reactive (meth)acrylic double bonds, but also at least two reactive hydroxyl groups per molecule, and that the hardener component consists of a polyfunctional, at least difunctional, isocyanate, where the resin and hardener components are present in stoichiometric ratio.
The coating system according to the invention has the additional advantage that the resin component has the following general formula: ##STR1## where R.sub.1, signifies an alkyl or aliphatic polyether or polyester group, R.sub.2 and R.sub.3 signify aliphatic or cycloaliphatic groups, and n=2-6, and preferably 3-5; and that the hardener component is an isocyanate with the following general formula: or cycloaliphatic residue. Advantageously, the coating system according to the invention contains as the hardener component a trifunctional isocyanate whose reactivity at room temperature can also be blocked.
It further contains as additives radical formers that are stable at room temperature, as well as inhibitors to prevent a premature cross-linking reaction of the (meth)acrylic double bonds.
Fillers and/or colored pigments and/or flame retardants and/or agents to protect against the effects of light such as UV absorbers or radical traps can also be present as additives.
Furthermore, accor
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patent: 4789604 (1988-12-01), van der Hoeven
patent: 4999271 (1991-03-01), Etherington et al.
patent: 5147959 (1992-09-01), Mishimoto et al.
patent: 5248752 (1993-09-01), Argyropoulous et al.
JP 59 093719 A (Matsushita Denko KK), May 30, 1984.
Horvath Michael
Wehrmann Felix
Weiss Josef
Gorr Rachel
Isovolta Osterreichische Isolierstoffwerke Aktiengesellschaft
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