Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1998-02-04
1999-12-14
Gorr, Rachel
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
525123, 427386, 427387, 4284231, C08G 1861
Patent
active
060019476
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a coating composition comprising
The present invention additionally relates to processes for the production of a multilayer protective and/or decorative coating on a substrate surface and to the use of the coating compositions in the area of automotive refinishing.
Particularly those coating compositions which are employed in the area of automotive refinishing are subject to very high quality requirements. For instance, these coating compositions must be capable of curing fully at low temperatures (.ltoreq.100.degree. C., preferably .ltoreq.80.degree. C.) and must, in so doing, be dust-dry and tack-free after less than 7 h. Further requirements are good solvent resistance, weathering resistance, masking resistance, yellowing resistance, sandability and a low intrinsic color of the resulting coatings. Furthermore, the coatings must be overcoatable, in order to ensure that paint damage in the adjacent region and in the region of the refinish can also be repaired.
Especially in the area of the coating of large vehicles, for example the coating of truck bodies, the masking resistance of the resulting coatings is important. In the case of large vehicles, indeed, it is common for text to be applied, which necessitates the adjacent region being masked off. If masking resistance is inadequate, it is necessary to remove the marks by laborious sanding and polishing by hand, which is associated with a considerable expenditure.
DE-A-41 24 167, then, discloses clearcoats for automative finishing, whose binders comprise copolymers in which from 9 to 20% by weight of a methoxy-functional polysiloxane are incorporated by condensation. However, owing to the high proportion of polysiloxane, these clearcoats known from DE-A-41 24 167 have the disadvantage that the topcoat appearance and/or the leveling of the clearcoats is adversely affected.
Furthermore, EP-A-603 561 discloses coating compositions whose binders comprise copolymers in which from 3 to 40% by weight of an .alpha.,.omega.-hydroxy-, carboxy- and/or epoxy-functional polysiloxane have been incorporated by polymerization.
In addition, JP-A 2-163177 discloses a coating composition which is based on hydroxyl-containing acrylate copolymers and polyisocyanates and which is employed in particular as an architectural coating composition. Features of these coatings are an improved weathering stability, which is achieved by incorporating, by polymerization, 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 per molecule as monomer component for preparing the acrylate copolymers, however, is not described in this document.
These coating compositions known from JP-A 2-163177 have the particular disadvantage that the topcoat appearance and/or leveling of the described coating compositions is adversely affected by the high siloxane content of the copolymers which are employed as binders.
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 high flexibility and are therefore particularly suitable for the coating of plastics materials, for example fenders. These coating compositions are different from the coating compositions of the present application, especially 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 acrylate copolymers is not described in this document.
Finally, EP-B-175092 discloses that the leveling properties, the lubricity and the mar resistance of coatings can b
REFERENCES:
patent: 4673718 (1987-06-01), Ryntz et al.
patent: 5670600 (1997-09-01), Nienhaus et al.
6001 Chemical Abstracts; "Acrylic polyurethane coating compositions" Apr. 19, 1993 No. 16, Columbus, Ohio, US; JP04, 292,674.
Borgholte Harald
Brunnemann Michael
Hallmann Olaf
Hoffmann Peter
Rubbert Bernhard
BASF Coatings AG
Gorr Rachel
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