Coating media, the use thereof, and a method of producing multil

Details Coating media, the use thereof, and a method of producing multil Coating media, the use thereof, and a method of producing multil

1998-03-09

2000-05-16

Dudash, Diana

Coating processes

Applying superposed diverse coating or coating a coated base

Synthetic resin coating

427409, B05D 714, B05D 302, B05D 136

Patent

active

060634480

DESCRIPTION:

BRIEF SUMMARY
This application is the national phase of international application PCT/EP96/02944 filed Jan. 30, 1997 which designated the U.S.
This invention relates to coating media which are particularly suitable for multilayer stoving coatings for the series coating of automobiles, and which are distinguished in particular by their high resistance to chemicals, their high resistance to water of condensation and their excellent condition for covering lacquer.
DE-A-43 38 703 describes a coating medium which contains a combination of two different hydroxy-functional (meth)acrylic copolymers and which contains a crosslinking agent combination comprising blocked polyisocyanate and aminoplast resin. Polyester resin may optionally be admixed with the (meth)acrylic copolymers as a further binder vehicle.
EP-A-0 541 604 and EP-A-0 206 072 describe acrylic polymers and the production thereof. These acrylic polymers can be produced in the presence of thinners, which may comprise polyester polyols. EP-A-0 036 975 describes clear lacquers for multilayer coatings, which consist of a two-component system (2-C system) comprising a polyol component and a polyisocyanate component which contains biuret and/or isocyanurate groups. The polyol component is a polyester polyol which may be present in the mixture with a polyacrylic resin. The polyacrylic resin can be produced in the presence of the polyester polyol.
The object of the present invention was to provide coating media for multilayer stoving coatings which are suitable for the series coating of automobiles and which are distinguished by their high resistance to chemicals, in particular acid resistance, their high resistance to water of condensation and their excellent condition for covering lacquer.
It has been shown that this object can be achieved by a coating medium which forms a subject of the present invention and which contains, as a binder vehicle:


______________________________________ A) 10 to 90% by weight of one or more hydroxy-functional (meth)acrylic copolymers, obtained from a1) 20 to 40% by weight of one or more hydroxyalkyl esters of (meth)acrylic acid a2) 10 to 30% by weight of one or more non-functionalised (meth) acrylates a3) 0 to 5% by weight of one or more unsaturated carboyxlic acids a4) 10 to 60% by weight of one or more non-functionalis ed monomers different from a2) a5) 0 to 15% by weight of one or more amino-functional monomers a6) 0 to 5% by weight of one or more multiply-unsaturat ed monomers B) 90 to 10% by weight of one or more hydroxy-functional polyesters, C) 0 to 40% by weight of one or more hydroxy-functional binder vehicles different from A) and B), D) 5 to 50% by weight of one or more blocked polyisocyanates, E) 5 to 40% by weight of one or more components based on triazine which crosslink with the hydroxyl groups of components A), B) and option- ally C) with the formation of ether and/or ester groups, ______________________________________ wherein at least 50% by weight of the (meth)acrylic copolymers, with respect to the total amount of component A), has been produced in the presence of one or more of the hydroxy-functional polyesters corresponding to at least 20% by weight of the total amount of component B).
The coating media according to the invention are formulated in particular as single-component (1-C) systems.
According to a particularly preferred embodiment of the invention, the hydroxy-functional polyesters of component B) of the binder vehicles are obtainable from


______________________________________ b1) 0 to 60% by weight of monocarboxylic acids of molecular weight range 112 to 600 b2) 10 to 70% by weight of polycarboxylic acids of molecular weight range 98 to 600 or anhydrides of poly- carboxylic acids of this type b3) 5 to 40% by weight of tri- and/or polyhydric alcohols of molecular weight range 100 to 400 b4) 0 to 40% by weight of dihydric alcohols of molecular weight range 62 to 2000 b5) 0 to 30% by weig

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