Vianova Kunstharz A.g.

Allnex Austria Gmbh

Gunther Monschein

Rudolf Schipfer

Gerhard Schmolzer

Gerhard Meglitsch

Wolfgang Daimer

Florian Lunzer

Ursula Meisner

Albine Kernbichler

The invention relates to a hydrophilically modified multifunctional amine AC which has more than one primary amino group per molecule, and at least one group per molecule derived from the reaction of an epoxide group with a reactive group selected from the group consisting of secondary amino groups &#x3e;NH, hydroxyl groups &#x2014;OH, mercaptan groups &#x2014;SH, amide groups &#x2014;CO&#x2014;NHR, where R can be hydrogen or an alkyl group having from one to twelve carbon atoms, hydroxyester groups, and acid groups, particularly carboxyl groups &#x2014;COOH, sulphonic acid groups &#x2014;SOH, and phosphonic acid groups &#x2014;POH, and preferably, also moieties which are compatible with an epoxy resin, as well as a process for its preparation, and a method of use thereof.

Multifunctional primary amine, process for its preparation, and use thereof

Cathodically depositable paint binders based on epoxy resin/amine adducts modified with diamine bridges which carry longer-chained substituents are described. The diamine bridges are the reaction products of diprimary amines and mono- and diepoxy compounds. The modified epoxy resin/amine adducts have low viscosities and low glass transition temperatures in spite of their high molecular weights. The stoved films, even with higher film thickness, have flawless surfaces and excellent mechanical properties.

Reacting polyamine/monoepoxide modifier, polyepoxy resins and amines

Modified epoxy resin/amine adduct by reacting polyamine/monoepoxide

Cathodically depositable binders water-dilutable upon neutralization comprising the reaction product of amine adducts of polyglycidylethers of polyphenols having an amine value based on tertiary amine groups of between about 30 and about 130 mg KOH/g, a hydroxy value based on primary hydroxy groups of between about 20 and about 200 mg KOH/g, and an average molecular weight of from about 1000 to about 20,000 with 0.5 to 20% b.w. based on the weight of the adduct of a polyoxyalkylene glycidyl ether to provide an adduct having polyoxyalkylene segments. The introduced hydrophilic segments allow for a reduction in the degree of neutralization necessary for stability of an electrodeposition bath which favorably influences the deposition equivalent and throwing power of the binder in a cathodic electrodeposition system.

Process for producing cathodically depositable paint binders

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Kalsdorf, Austria

Gunther Monschein