Coating processes – Applying superposed diverse coating or coating a coated base – Synthetic resin coating
Patent
1998-04-30
2000-09-05
Dudash, Diana
Coating processes
Applying superposed diverse coating or coating a coated base
Synthetic resin coating
427387, 427409, 524513, 524523, 525100, 525123, 525131, 525477, 525479, 528486, 528491, B05D 716, C08J 300, C08F 800, C08L 7500
Patent
active
061139882
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to coating compositions BM comprising (A) from 5 to 60% by weight of at least one polyester-modified acrylate resin, (B) from 1 to 35% by weight of at least one hydroxyl-containing, siloxane-modified polyacrylate resin, and (C) from 5 to 50% by weight of a crosslinking agent, and to the use of the coating compositions BM in the field of automotive finishing or as a constituent of multicoat finishing systems.
BACKGROUND OF THE INVENTION
Very high quality requirements are imposed in particular on coating compositions employed in the area of automotive refinishing. For instance, these coating compositions must be fully curable at low temperatures (<100 degrees C., preferably<80 degrees C.) and in this context should be dust-dry and tack-free even after less than 7 hours. Moreover, good solvent resistance, weathering resistance, masking resistance, yellowing resistance, sandability and a low inherent color of the resulting coatings are required. In addition to this, the coatings must be able to be overpainted in order thus to insure that it is also possible to repair paint damage in the adjacent area.
In the area of the finishing of large-size vehicles, for example the finishing of truck bodies, the masking resistance of the resulting coatings is of particular importance. Large-size vehicles are commonly provided with written characters for whose application it is necessary to mask off the adjacent area. If the masking resistance is inadequate, the marks must be removed manually, by laborious sanding and polishing, which entails a considerable financial outlay.
DE-A-41 24 167 discloses clearcoats for automotive finishing which as binders contain copolymers in which from 9 to 20% by weight of a methoxy-functional polysiloxane has been incorporated by condensation. These clearcoats however, owing to the high proportion of polysiloxane, have the disadvantage that the topcoat holdout or the leveling of the clearcoats is adversely affected.
Furthermore, EP-A-603 561 discloses coating compositions which as binders contain copolymers in which from 3 to 40% by weight of an alpha,omega-hydroxy-, -carboxy- and/or -epoxy-functional polysiloxane has been incorporated by polymerization.
JP-A-2-163177 comprises a coating composition based on hydroxyl-containing acrylate copolymers and polyisocyanates which is employed, in particular, as a masonry coating composition. In this case the coatings are notable for improved weathering stability, which is obtained by copolymerization of from 0.5 to 15% by weight of a polysiloxane macromonomer into the hydroxyl-containing acrylate copolymer. The use of a reaction product of acrylic and/or methacrylic acid with the glycidyl ester of an alpha-branched monocarboxylic acid having 5 to 18 carbon atoms as monomer component, however, is not described in this document.
These coating compositions known from JP-A-2-163177 have, in particular, the disadvantage that the topcoat holdout or leveling of the coating compositions described is adversely affected by the high siloxane content of the copolymers which are employed as binder.
U.S. Pat. No. 4,754,014 discloses coating compositions based on hydroxyl-containing acrylate copolymers which are modified with polysiloxane macromonomers. The polysiloxane macromonomers are prepared by reacting a hydroxy-functional polysiloxane with an epoxy-functional acrylate. These coating compositions known from U.S. Pat. No. 4,754,014 exhibit a high flexibility and are therefore particularly suitable for the coating of plastics materials, for example fenders. These coating compositions differ from the coating compositions of the present application, in particular, in that the use of a reaction product of acrylic and/or methacrylic acid with the glycidyl ester of an alpha-branched monocarboxylic acid having 5 to 18 carbon atoms per molecule as monomer component for preparing the hydroxy- functional acrylate copolymers, and the specific combination of hydroxy-functional acrylate component, polyester-modified
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Borgholte Harald
Hallmann Olaf
BASF Coatings AG
Dudash Diana
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