Coating agent on the basis of a polyacrylate resin containing an

Coating processes – Applying superposed diverse coating or coating a coated base – Synthetic resin coating

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Details

427409, B05D 136, B05D 302

Patent

active

060999128

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a coating composition comprising from mixture of such monomers, acid, or mixtures of such monomers, double bonds which is different from (a) and (b), which is different from (a), (b) and (c), or a mixture of such monomers, different from (a), (b), (c) and (d), or a mixture of such monomers, (b), (c), (d) and (e), or a mixture of such monomers, and different from (a), (b), (c), (d), (e) and (f), or a mixture of such monomers,
The present invention additionally relates to processes for producing a multicoat protective and/or decorative coating on a substrate surface and to the use of the coating compositions in the sector of automotive refinishing.


BACKGROUND OF THE INVENTION

Coating compositions based on hydroxyl-containing polyacrylate resins and crosslinking agents are known, for example, from JP-A 4-1254. In that document, the hydroxyl-containing polyacrylate resins which are employed as binder are obtainable from hydroxyl-containing monomers, alkyl acrylates, alkyl methacrylates, optionally styrene and also optionally ethylenically unsaturated polymers. In that context it is essential to the invention that the polyacrylate resin has been prepared using 4-tert-butylcyclohexyl acrylate and/or 4-tert-butylcyclohexyl methacrylate as monomer component. The hydroxyl-containing monomer employed is, in particular, hydroxyethyl acrylate and/or hydroxyethyl methacrylate.
These coating compositions known from JP-A 4-1254, especially when used as a transparent topcoat over a basecoat film, have the particular disadvantage that, when hydroxyethyl acrylate and/or hydroxyethyl methacrylate are used as OH monomer, the resulting coatings are of inadequate adhesion to the basecoat film. A further disadvantage of these coating compositions known from JP-A 4-1254 is the inadequate pot life of the coating compositions.
EP-B-0 158 161 discloses hydroxyl-containing acrylate copolymers formed by copolymerization of acrylate monomers having at least two olefinically unsaturated double bonds, hydroxyl-containing monomers and further olefinically unsaturated monomers, which, together with melamine-formaldehyde resin as crosslinking agent, can be employed as coating compositions.
It is likewise a feature of these coating compositions known from EP-B-0 158 161 that, especially when used as transparent topcoat over a basecoat film, they have the disadvantage that, when hydroxyethyl (meth)acrylate is used as hydroxyl-containing monomer, they result in coatings with inadequate adhesion to the basecoat film and that the pot life of the coating compositions is inadequate.
EP-A-0 638 591 describes hydroxyl-containing copolymers which can be prepared by bulk polymerization in which one component is included in the initial charge at the beginning of polymerization, and in the subsequent course of polymerization at least two olefinically unsaturated monomers are added, at least one of which contains at least one carboxyl group and at least one is sterically hindered. Also described is the use of such copolymers in high-solids coating compositions. Again, the adhesion of such coating compositions according to EP-A-0 638 591 to basecoat films is inadequate.
DE-A-44 07 415 discloses coating compositions which provide an outstanding solution to the problems resulting from the prior art to date. Such coating compositions include (A) at least one hydroxyl-containing polyacrylate resin obtainable from (a) a cycloaliphatic ester of (meth)acrylic acid, (b) a hydroxyl-containing ester of (meth)acrylic acid, (c) optionally a hydroxyl-containing, ethylenically unsaturated monomer different from (a) and (b), (d) an aliphatic ester of (meth)acrylic acid different from (a), (b) and (c), (e) optionally a vinyl-aromatic hydrocarbon different from (a), (b), (c) and (d), and (f) optionally a further ethylenically unsaturated monomer different from (a), (b), (c), (d) and (e), and (B) at least one crosslinking agent.
When used as transparent topcoats over a pigmented basecoat film, the coating composit

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