Coating processes – Applying superposed diverse coating or coating a coated base – Synthetic resin coating
Patent
1998-04-17
2000-01-11
Dudash, Diana
Coating processes
Applying superposed diverse coating or coating a coated base
Synthetic resin coating
427409, 525123, 525124, 525127, 525162, 525223, 5253299, 5253302, 5253305, 525440, B05D 136, B05D 302, C08F 830, C08F 832
Patent
active
060133260
DESCRIPTION:
BRIEF SUMMARY
This invention relates to coating compositions which are in particular suitable for stoved multi-layer lacquer coatings, for example for automotive original lacquer coating, which are in particular distinguished by elevated acid resistance, elevated resistance to condensed water and excellent topcoat lacquer qualities.
EP-A-0 653 468 describes a coating composition which contains a combination of two different hydroxy-functional (meth)acrylic copolymers together with a crosslinking agent combination comprising a blocked polyisocyanate and an amino resin. Polyester resin may optionally be added to the (meth)acrylic copolymers as an additional binder.
The object of the invention is to provide coating compositions for stoved multi-layer coatings which are suitable for automotive original lacquer coating and which are distinguished by elevated acid resistance, excellent topcoat lacquer qualities and good resistance to exposure to condensed water.
It has been found that this object may be achieved by a coating composition which is provided by the present invention and contains as the binder: copolymers obtainable from (meth)acrylate (meth)acrylates having 8 to less than 18 C atoms in the (cyclo)alkyl residue (meth)acrylates having up to 7 C atoms in the (cyclo)alkyl residue copolymers obtainable from (meth)acrylate (meth)acrylates having 8 to less than 18 C atoms in the (cyclo)alkyl residue (meth)acrylates having up to 7 C atoms in the (cyclo)alkyl residue and B), with the hydroxyl groups of components A), B) and optionally C) to form ether and/or ester groups, case amount to 100 wt. %.
The (meth)acrylic copolymers present in the coating compositions according to the invention may be produced by free-radical copolymerisation using conventional processes. The solution polymerisation process is preferred for synthesis of the (meth)acrylic copolymers (components A and B) used in the coating composition according to the invention. In this process, the solvent is introduced into the reaction vessel, heated to boiling temperature and the monomer/initiator mixture continuously apportioned within a certain time.
The term "(meth)acrylic" used in the present description and patent claims is synonymous with "acrylic and/or methacrylic". The term "(cyclo)alkyl" denotes "cycloalkyl and/or alkyl".
Polymerisation is preferably performed at elevated temperature, for example at temperatures of between 80.degree. C. and 180.degree. C., preferably at 100.degree. C. to 150.degree. C.
The polymerisation reaction may be initiated with conventional free-radical initiators. Examples of free-radical initiators are those based on peroxides, for example dialkyl peroxides such as di-tert.-butyl peroxide, dicumyl peroxide; diacyl peroxides, such as dibenzoyl peroxide, dilauroyl peroxide; hydroperoxides, such as cumene hydroperoxide, tert.-butyl hydroperoxide; peresters, such as tert.-butyl perbenzoate, tert.-butyl perpivalate, tert.-butyl per-3,5,5-trimethylhexanoate, tert.-butyl per-2-ethylhexanoate; peroxydicarbonates, such as di-2-ethylhexyl peroxydicarbonate, dicyclohexyl peroxydicarbonate; perketals, such as 1,1-bis-(tert.-butylperoxy)-3,5,5-trimethylcyclohexane, 1,1-bis-(tert.-butylperoxy)cyclohexane; ketone peroxides, such as cyclohexanone peroxide, methyl isobutyl ketone peroxide and azo compounds, such as 2,2'-azobis(2,4-dimethylvalero-nitrile), 2,2'azobis(2-methylbutyronitrile), 1,11-azobiscyclohexanecarbonitrile, azobisisobutyronitrile; together with C--C cleaving initiators, such as for example benzopinacole derivatives.
The polymerisation initiators are generally used, for example, in a quantity of 0.1 to 4 wt. %, relative to the initial weight of monomers. During polymerisation, the monomers may also be apportioned separately or at different times. The monomers or monomer mixture used may contain the free-radical initiators or the free-radical initiators may be added to the monomer mixture optionally at a slightly different time or be apportioned separately.
Suitable organic solvents which may conveniently be used in solution
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Flosbach Carmen
Herrmann Friedrich
Kerber Hermann
Reifferscheidt Heinz-Walter
Schloesser Carmen
Dudash Diana
Herberts GmbH
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