Vianova Kunstharz A.g.

Herberts Gesellschaft MIT Beschrankter Haftung

Vianova Resins Ag

Helmut Honig

Willibald Paar

Georg Pampouchidis

Georgios Pampouchidis

Herbert Matzer

Johann Gmoser

Roland Feola

Wolfgang Daimer

Klausjorg Klein

Dietrich Saatweber

Manfred Valtrovic

Wolfgang Leitner

Kurt E Jaeger

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

The invention relates to organotin compositions, to a process for their production, and to their use in catalyzing the crosslinking reactions of cationic paint binders crosslinkable by transesterification and/or transurethanization and/or by the reaction of terminal double bonds. The organotin compositions are prepared by dispersion of dibutyltin oxide in a dispersion medium comprising at least one substituted oxazolidine compound and, if appropriate, specially chosen water-tolerant organic solvents. Cationic paints, especially cathodically depositable electrocoating paints, catalyzed by the organotin compositions have very good sedimentation stability in dilute paint batches and show no surface defects in the stoved paint films.

Organotin compositions containing oxazolidine dispersion media, a

Aqueous cathodic electrodeposition lacquer coating compositions are provided which comprise (A) certain water soluble synthetic resin binders containing amino groups; (B) crosslinking reagents which react with resin (A), and (C) certain soluble or insoluble transesterification catalysts for the crosslinking reagents. Methods of forming baked finish coatings which are cathodically deposited on electrically conductive surfaces using the lacquer coatings are also disclosed.

Aqueous cathodic electro-deposition lacquer coating compositions and

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

The invention is directed to a process for the production of cationic binders for pigment pastes for water-dilutable paints, particularly for cathodic electrodeposition based on low molecular oxazolidine group carrying modified epoxy compounds, and to the pastes obtained. The process is characterized in that preferably aliphatic di- or polyepoxy compounds are reacted with primary mono- and/or diamines and optionally monocarboxy compounds and that oxazolidine groups are introduced into the molecule by reaction with carbonyl compounds. The products show extremely high pigment loading capacity and an excellent performance in cathodically depositable electrodeposition paints. The products permit formation of low solvent paint systems.

Pigment grinding vehicles for use in water-dilutable paints

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

Cationic epoxy resin esters suitable as binders for stoving coating compositions, particularly for application by electrodeposition, and as mill base resins for grinding pigments and extenders; and a process for producing same is described. The resin esters are produced through reaction of a resinous compound carrying at least two 1,2-epoxy groups with carboxylic acids and, optionally, with primary and/or secondary alkyl- and/or alkanolamines. The carboxylic acid employed, totally or partially, is the reaction product of a dicarboxylic acid anhydride and a tertiary amine which has the structure - ##STR1## wherein R and R.sub.x are a hydrogen atom or an alkyl radical or an aryl radical which may be substituted, R.sub.7 is an alkyl radical, an amino-alkyl radical having the primary amino groups, if present, blocked (as a ketimine) or the moiety remaining after the reaction with an active hydrogen atom of an acrylic or methacrylic monomer monofunctional with regard to the double bond, and wherein n is 2 or 3, the quantity of basic component being chosen in order that the epoxy-free final product has an amine value of at least 35, and preferably of from 40 to 140 mg KOH/g.

Novel cationic epoxy resin esters and process of producing same

Cathodically depositable electrodeposition paint binders comprising the reaction product of an epoxy resin with at least two epoxy groups with amines carrying primary amino groups and, optionally, with a carboxylic acid compound to provide an epoxy resin-amino adduct which is then reacted with a phenol and formaldehyde. The binders have excellent corrosion resistance and crosslink to provide coating films at relatively low stoving temperatures without splitting off of substances harmful to the environment.

Cathodically depositable electrodeposition paint binders based on

Process for producing cationic epoxy resins carrying oxazolidine groups suitable as paint binders, and particularly paint binders for the formulation of cathodically depositable paints, wherein the epoxy resin is reacted with a hydroxy functional oxazolidine compound or with an oxazolidine compound carrying in the ring the structure ##STR1## in the presence of a monocarboxy compound. The presence of the monocarboxy compound permits the direct reaction or linkage of the epoxy resin with the oxazolidine compound without gelation; and, additionally, the monocarboxy compound favorably influences the film-forming characteristics of the binders.

Paint binders carrying oxazolidine groups and process for producing such

Heat curable, cathodically depositable, aqueous coating compositions comprising an aqueous emulsion of 98 to 50 percent by weight, preferably 95 to 70 percent by weight, of one or more self-crosslinking cationic binders based on modified epoxy compounds, water-soluble upon partial or total neutralization with an inorganic or organic acid, and 2 to 50 percent by weight, preferably 5 to 30 percent by weight, of a di- and/or triurethane having the formula - ##STR1## wherein R represents an aromatic, cycloaliphatic, or aliphatic hydrocarbon radical; R.sub.1 stands for a hydroxyethyl(meth)acrylate or a hydroxypropyl(meth)acrylate radical; R.sub.2 is the radical of a saturated and/or unsaturated aliphatic monoalcohol with at least 6 carbon atoms and/or an alkyl or alkylene radical with at least 6 carbon atoms, and n is an integer of 1 or 2. The coating compositions cure at low temperatures and short curing times to provide films having excellent resistance to water, chemicals, and corrosion; and have good leveling characteristics and good adherence to diverse substrates.

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Graz, Austria

Helmut Honig