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
1998-07-20
1999-12-14
Niland, Patrick D.
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...
4273722, 4273855, 524507, 524588, 524839, 524840, 525123, 525127, 525128, 525131, 525455, C08J 300, C08K 320, C08L 7500, C08F 830, B05D 302
Patent
active
060019247
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to aqueous binder vehicle dispersions based on hybrid polymers, which are produced by the reaction of polyurethane(-urea) resins and optionally additional polyesters and of (meth)acrylic copolymers which are produced in the presence of the polyurethane(-urea) resins and/or polyesters. The invention also relates to the process for producing these hybrid polymers, and to aqueous coating media which can be produced therefrom, and to methods of multi-layer coating using these coating media.
BACKGROUND OF THE INVENTION
In the automobile industry, metal and plastics parts are provided with multi-layer coatings. These serve to protect the substrates from corrosion, but should also exhibit a good decorative effect. They are generally multi-layer coatings based on a primer coat and one or more subsequent coats, e.g. base lacquer coats, covering lacquer coats, which can then be provided with a transparent clear lacquer as a subsequent coating.
Water-thinnable base lacquers based on polyurethane/poly(meth)acrylate polymer hybrids are known.
EP-A-0 297 576 describes the polymerisation of (meth)acrylic monomers in the presence of polyurethane dispersions which have been produced beforehand. After polymerisation is complete, aqueous base lacquers can be produced from the dispersions obtained.
EP-A-0 353 797 describes the production of a hydroxy-functional polyurethane resin in an unsaturated monomer as a solvent, wherein the unsaturated monomer may be reactive towards isocyanate. After conversion of the polyurethane solution into the aqueous phase, an emulsion polymerisation is carried out. The hybrid polymer dispersion which is obtained can be used as a binder vehicle for aqueous base lacquers.
EP-A-0 401 565 describes aqueous base lacquers, the binder vehicles of which are produced by the emulsion polymerisation of aqueous emulsions, which are prepared with the addition of external emulsifiers, of polyurethane macromonomers which have been functionalised to render them unsaturated and which are dissolved in unsaturated monomers.
EP-A-0 424 705, EP-A-0 521 928, EP-A-0 522 419, EP-A-0 522 420, EP-A-0 662 992 and WO 95/14721 describe aqueous base lacquers which are based on polyurethane/poly(meth)acrylate polymer hybrids, wherein the polymer- hybrids have been synthesised by the graft or block polymerisation of unsaturated monomers with polyurethane macromonomers which have been functionalised to render them unsaturated. In this connection, the unsaturated groups of the polyurethane macromonomers may be lateral or terminal groups. The unsaturated polyurethane macromonomer may have been prepared dissolved in an organic solvent, for example in the unsaturated monomer itself, or in the absence of solvents. Copolymerisation can be conducted in the aqueous or non-aqueous phase, namely before or after conversion into the aqueous dispersion.
Aqueous emulsions, particularly those which are free from emulsifiers, of crosslinkable polymer-polyurethane resins which contain hydroxyl groups are known from DE-A-44 13 737. These aqueous dispersions can be obtained by the joint chain extension of polyurethanes, which are free from urea groups and which comprise OH groups which are substantially terminal, together with polymers which contain hydroxyl groups and which are based on ethylenically unsaturated monomers, with diisocyanates in a non-aqueous medium, neutralisation of carboxyl groups which are present and which can be converted into anionic groups, and conversion of the resulting product into the aqueous phase. The aqueous binder vehicle dispersions which are obtained in this manner are very suitable as binder vehicles for aqueous base lacquers such as those which are used in the production of decorative multi-layer coatings in the field of motor vehicle coating.
The known aqueous base lacquers are in need of improvement as regards the stone impact resistance of the multi-layer coatings which are produced with them. If these aqueous base lacquers are used in repair coating operati
REFERENCES:
patent: 5041494 (1991-08-01), Franke et al.
patent: 5334420 (1994-08-01), Hartung et al.
patent: 5654391 (1997-08-01), Gobel et al.
patent: 5691425 (1997-11-01), Klein et al.
Brunner Marcus
Dobert Jurgen
Gobel Armin
Vogt-Birnbrich Bettina
Herberts GmbH
Niland Patrick D.
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