Vianova Kunstharz A.g.

E.i. Dupont De Nemours and Company

Vianova Resins Ag

Georg Pampouchidis

Helmut Honig

Willibald Paar

Herbert Matzer

Helmut Hoenig

Manfred Valtrovic

Wolfgang Leitner

Anton Bleikolm

Johann Gmoser

Roland Feola

Klausjoerg Klein

Gerald Hobisch

Erik Bambach

Herbert Deu

A cathodic electrodeposition coating composition which produces substantially pinhole-free coatings on galvanized surfaces, said composition comprising 0.2 to 8% by weight, based on the weight of resin solids in the composition, of at least one 5- or 6-membered cyclic imide having a (cyclo)alkyl or (cyclo)alkenyl residue comprising 4 to 12 carbon atoms on the imide nitrogen.

Cathodic electrodeposition coating compositions and process for using same

Use of homopolymers or copolymers of 2-ethyl hexyl acrylate as an additive in aqueous cathodically depositable coatings to suppress the formation of surface defects in coating films, in which the proportion by mass of the comonomers in the monomer mixture used for the preparation of the copolymers does not exceed 35%.

Electro-dipcoating baths with additives preventing the formation of craters in the baked coating

A two-component concentrate which includes an aqueous dispersion of a cathodically depositable binder having groups comprising active hydrogen that are cross-linkable using blocked polyisocyanate, as the binder component, and an anhydrous, organic solution of an oxime-blocked isocyanate-functional adduct of aromatic polyisocyanate and at least one compound comprising at least one group capable of addition towards isocyanate and at least one tertiary amino group, as the cross-linking component is used for the preparation of cathodic electrodeposition coating compositions.

Concentrate suitable for the preparation of cathodic electrodeposition coating compositions

The invention relates to a process for the preparation of pigment paste resins for cathodically depositable coating compositions, wherein diepoxide compounds which contain polyoxyalkylene structures and alkyl and/or alkylene and/or hydroxyalkyl radicals having more than 3 carbon atoms are first reacted to form epoxy resin/amine adducts and final products with oxazolidine structures are obtained by a partial or complete reaction of secondary amino groups with formaldehyde.

Pigment paste resins for cathodically depositable coating compositions

This invention relates to a process for the preparation of self-crosslinking cationic paint binders which can be diluted with water after protonation and are based on modified aminoalkylation products of phenols; to the binders prepared by this process and to their use for formulating water-dilutable paints, in particular electrodeposition paints which can be deposited cathodically. The process is characterized in that an aminoalkylation product of a phenol containing at least one secondary amino group is reacted with epoxide compounds, and after temperature treatment, the reaction product is reacted with partly blocked isocyanate compounds. The process permits the use of blocking agents which allow stoving temperatures in the range of 130 to 150.degree. C.

Process for the preparation of modified aminoalkylation products and

Crosslinking components for cationic paint binders which are reaction products of hydroxyl-functional carbamate compounds with half-blocked diisocyanates are described. The carbamate compounds are reaction products of cyclic organic carbonates with aliphatic monoamines and/or diamines and/or triamines and/or tetraamines and/or alkanolamines, all such amines having primary and/or secondary amino groups. The crosslinking components produced according to the invention, in combination with resin components carrying hydroxyl groups and/or primary or secondary amino groups, preferably with those based on epoxide/amine adducts or containing similar molecular units, give binders which can be baked at temperatures of 140.degree. C. and higher.

Crosslinking components for cathodically depositable paint binders

A process for the preparation of water-dilutable binders for cathodically depositable electrodeposition paints wherein 5 to 60 mol % of the epoxy groups of a resinous compound having at least two 1,2-epoxy groups per molecule are reacted with disecondary diamines obtained by the reaction of polypropylene glycol diglycidylethers or polypropylene glycol diacrylates with compounds containing a primary amino group is described. The binders prepared in accordance with the invention are suitable, in particular, for formulating electrodeposition paints, to provide films having a greater layer thickness under normal deposition conditions.

Process for the preparation of binders for cathodically depositable

Preparation of pigment paste resins for cathodically depositable coating compositions based on epoxy resin-amine adducts obtained from unmodified or modified epoxy resins, which by partial or complete reaction of secondary amino groups with formaldehyde contain oxazolidine structures; whose tertiary amino groups introduced via primary-tertiary diamines are quaternized to at least 20 mol % using an organic acid and a monoglycidyl compound and which in a solution adjusted with water to a correct application viscosity contain a total of 80 to 100 millimoles of acid per 100 g of solid resin are described. The pigment pastes possess, both in concentrated and dilute form, a stability which meets practical requirements and, because of their rheology, are readily processed to ensure formation of defect-free films both during deposition and crosslinking by stoving. The applied films have good properties.

Process for the preparation of pigment paste resins for cathodically

Cathodically depositable self-crosslinking binders for electrodeposition having a substantially water-insoluble component which is a derivative of a dioxazolidine which carries chain-end or side-chain unsaturated double bonds are described. The binders have favorable wetting properties and emulsifying characteristics, as well as excellent film characteristics in the finished coatings.

Cathodically depositable synthetic resin binders and process for

A process for producing multiple-coat paint systems is described wherein a cathodically electro-depositable primer containing thermically polymerizable synthetic resins as the binder, immediately prior to the application of an additional coating, is irradiated with ionizing irradiation for a period of from one to 20 seconds. The irradiation for the short period of time cures the primer so that subsequent coatings applied to the primer do not detrimentally affect the primer coating or the finished paint system.

Process for producing multiple-coat paint systems based on thermically

Hydrazine is utilized for preventing side reactions during the preparation and storage of polyisocyanates partially blocked with hydroxy amines which are utilized for the introduction of basic functional groups into organic coating compositions which are deposited cathodically in an electrodeposition process. The inhibiting compound is used in the form of hydrazine hydrate at a level of from about 50 to 5000 ppm calculated on the amine used in the reaction.

Stabilized polyisocyanates partially blocked with hydroxy amines

Auto-crosslinking, cathodically depositable binders which are water-dilutable upon neutralization comprising the reaction product of:

Auto-crosslinking, cathodically depositable binders

Auto-crosslinkable, cathodically depositable aqueous coating compositions which are the reaction product of 2 moles of a diepoxide, 1 mole of a secondary-secondary or primary-tertiary diamine, 0-1 moles of a saturated and/or unsaturated monocarboxylic acid, and 2-1 moles of a secondary amine with optional subsequent partial or total reaction of the hydroxy groups of the reaction product with an alpha,beta-unsaturated monoisocyanate. The binders are rendered water-soluble by neutralization with inorganic and/or organic acids. The binders are capable of being neutralized with low levels of neutralizing acids to provide a component of a coating composition which will cure at low temperatures to give films having excellent surface qualities.

Auto-crosslinkable, cathodically depositable binders

Binder combinations for the formulation of cathodic paints comprising blends of epoxy resins as follows: (A) 40 to 80% by weight of reaction products of epoxy acrylates with basic monoisocyanates; (B) 5 to 30% by weight of reaction products of epoxy amine adducts with unsaturated monoisocyanates, and (C) an epoxy resin modified with a semi-ester of a dicarboxylic acid anhydride and an N-hydroxyalkyloxazolidin and an amine, rendered water soluble through neutralization of the basic groups. The binder combinations as defined have enhanced throwing power and improved stability of the paint tank.

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Graz, Austria

Georg Pampouchidis