Basf Lacke+farben Ag

Basf Aktiengesellschaft

Basf Lacke & Farben Aktiengeselllschaft

Klaus Huemke

Dieter Faul

Gerhard Hoffmann

Ulrich Heimann

John A Gilbert

Thomas Schwerzel

Hans Schupp

Rainer Blum

Konrad Knoll

Ernst Schefczik

Dirk Lawrenz

Helmut Fobbe

Christian Sinn

A heat curable coating composition, particular for cathodic electrocoating, comprises

Heat curable cathodic electrocoating composition

Synthetic resins contain, as essential components, A) from 20 to 95% by weight of a crosslinkable binder selected from the group consisting of the polymers, polyadducts or polycondensates having reactive centers in the form of hydroxyl, thio, primary and/or secondary amino groups and/or hydrophilic centers in the form of ammonium, sulfonium and/or phosphonium groups and B) from 5 to 80% by weight of polymers consisting of a core and one or more shells and furthermore C) from 0 to 10% by weight of one or more crosslinking agents and D) from 0 to 10% by weight of a pigment formulation consisting of one or more pigments and a resin having surfactant properties and E) from 0 to 10% by weight of additives and/or assistants.

Synthetic resins

Binder systems suitable for electrocoating and consisting of a base resin A which carries groups which can be protonated with acids or cationic quaternary groups and, if desired, hydroxyl or thiol groups, a crosslinking component B which carries at least two blocked isocyanate groups per molecule and an organic iron compound C which is partially or completely soluble in water, as a catalyst for the thermal crosslinking of components A and B, and if desired, an additive D which increases the catalytic activity of C, are used to prepare dispersions which are used for electrocoating.

Binders for electrocoating

Novel polymers which are suitable as binders are obtainable by reacting

Polymers suitable as binders

Polymeric reaction products are obtained by reacting I) prepolymers obtained from

Polymeric reaction products

Synthetic resins are based on products which are obtainable by reacting

Epoxy resins for ternary sulfonium electrocoating compositions

Water-thinnable coating compositions useful in electrocoating comprise

Water-thinnable coating compositions

A synthetic resin contains, as essential components,

Synthetic resin

Epoxy resins with urethane groups, containing on average per molecule from 0.5 to 5 groups of the formula I ##STR1## where the substituents R.sup.1 and R.sup.2 are C.sub.1 -C.sub.8 -alkyl groups, which may also be linked together to form five- or six-membered rings, which may contain an oxygen atom, or are each phenyl, are useful in electrocoating.

Epoxy resin with aminomethylene groups

Cationic resins are obtainable by reaction of

Cationic resins based on copolymers of butadiene and acrylonitrile

Polymeric reaction products useful as additions to electrocoating baths are obtainable from

Chemiluminescenct 3-aminobenzene-1,2,4,5-tetracarboxylic dihydrazides.

3-aminobenzene-1,2,4,5-tetracarboxylic dihydrazides and composition

A heat-curable coating composition for cathodic electrocoating which becomes water-thinnable on protonation with an acid contains

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Friedelsheim, Germany

Klaus Huemke