Paints and use of these paints as topcoats for the finishing of

Details Paints and use of these paints as topcoats for the finishing of Paints and use of these paints as topcoats for the finishing of

1993-01-04

1995-07-04

Dean, Ralph H.

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...

524267, 524269, C09D20100, C09D18306

Patent

active

054300835

DESCRIPTION:

BRIEF SUMMARY
The invention relates to paints and the use of these paints as topcoats for the finishing of automobile bodies.
Automobile bodies are usually painted with at least an electrocoating paint, a body filler, a metallic or a solid-color basecoat, if required, and a topcoat.
In those cases in which a metallic or a solid-color basecoat has been applied, a clearcoat is applied as topcoat. In all other cases the topcoat consists of a solid-color paint.
Severe demands are made on the topcoat finish of automobile bodies. It should impart to the vehicle as attractive an appearance as possible and at the same time be resistant to external influences.
The object of the present invention is to provide paints, especially clearcoats, which can be used as topcoats for the finishing of automobile bodies and with which it is possible to produce topcoat finishes which possess in comparison with topcoat finishes of the prior art improved characteristics, especially improved acid resistance and/or improved water-repellent characteristics and/or improved weather resistance and/or improved resistance to mechanical stresses incurred in the cleaning of topcoat finishes by brushes (improved "brush resistance").
Surprisingly, this object is achieved by making available paints which contain a compound of the general formula (I) or a mixture of compounds of the general formula (I), the general formula (I) being ##STR3## and n, m, X, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and Y having the following meaning:
- n stands for a number between 2 and 25, preferably for a number between 5 and 15
- m stands for a number from 0 to 5
- X and Y can be identical or different and stand for a functional group, for example a hydroxyl, amino, carboxyl or NCO group
- R.sup.1 and R.sup.2 can be identical or different and stand for an alkylene radical, preferably for an alkylene radical having 1 to 6 carbon atoms, or for an arylene radical, preferably a phenylene radical
- R.sup.2 and R.sup.3 can be identical or different and stand for an alkyl radical, preferably for an alkyl radical having 1 to 3 carbon atoms, or for an aryl radical, preferably for a phenyl radical
- R.sup.5 stands for ##STR4##
Z standing for X, Y or R.sup.2.
Particularly advantageous finishes are provided by paints which contain a compound of the formula -Si(CH.sub.3).sub.2 -CH.sub.2 -CH.sub.2 -CH.sub.2 -OH
in which n stands for a number between 10 and 14, preferably a number between 11 and 13, particularly preferably for a number between 11.5 and 12.5.
The siloxane compounds used according to the invention are commercially available. Manufacturers of such compounds are, for example, Th. Goldschmidt AG, Efka Chemicals B.V. and Dow Corning Corporation Europe, Brussels.
The siloxane compounds used according to the invention are expediently incorporated in amounts of 0.01 to 4.0, preferably 0.5 to 2.5% by weight or 0.2 to 2.5% by weight, into known paints suitable for the topcoat finishing of automobile bodies, the percentages by weight on the total solids content of 0.01 to 4.0, preferably 0.5 to 2.5% by weight or 0.2 to 2.5% by weight, into known paints suitable for the topcoat finishing of automobile bodies, the percentages by weight being based on the total solids content of binder and crosslinking agent. The paints can be both conventional (i.e. organic solvent-based) and aqueous.
The siloxane compounds used according to the invention are preferably incorporated into paints which comprise a hydroxyl-containing polyacrylate resin or a mixture of hydroxyl-containing polyacrylate resins and/or a hydroxyl-containing polyester resin or a mixture of hydroxyl-containing polyester resins and/or a hydroxyl-containing alkyd resin or a mixture of hydroxyl-containing alkyd resins as binders and an amino resin, preferably a melamine-formaldehyde resin or a mixture of amino resins or a mixture of melamine-formaldehyde resins or a polyisocyanate or a mixture of polyisocyanates as crosslinking agents.
The hydroxyl-containing polyacrylate resins should have a hydroxyl value of 50 to 200, preferab

REFERENCES:
patent: 4774278 (1988-09-01), Yoshiuka
patent: 4812518 (1989-03-01), Haubennestel
patent: 4931492 (1990-06-01), Foster et al.

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