Vianova Kunstharz A.g.

Georgios Pampouchidis

Helmut Honig

Wolfgang Daimer

Heiner Verdino

Cathodically depositable, aqueous coating compositions comprising the reaction product of (A) polycondensates having free hydroxyl groups with a hydroxyl number of at least 40 mg KOH/g, and an average maximum molecular weight of 5000; and (B) a compound having an average of from about 0.8 to 1.5 free isocyanate groups and at least one basic aliphatically bound nitrogen atom. Optionally, there can be included in the reaction product a compound having from about 0.8 to 1.5 free isocyanate groups and from 1 to 3 ethylenically unsaturated double bonds. The coating compositions cure at relatively low temperatures and relatively short curing times to provide films having excellent resistance to water, chemicals, and corrosion.

Cathodically depositable ester-containing coating compositions

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.

Cathodically depositable coating compositions for electrodeposition (II)

Cathodically depositable, aqueous coating compositions comprising the reaction product of (A) diene polymers containing free hydroxyl groups with a hydroxyl number of at least 40 mg KOH/g and an average maximum molecular weight of 4000; and (B) a compound having an average of from about 0.8 to 1.5 free isocyanate groups and at least one basic aliphatically bound nitrogen atom. Optionally, there can be included in the reaction product a compound having from about 0.8 to 1.5 free isocyanate groups and from 1 to 3 ethylenically unsaturated double bonds. The coating compositions cure at relatively low temperatures and relatively short curing times to provide films having excellent resistance to water, chemicals, and corrosion.

Cathodically depositable coating compositions

Self-crosslinking coating compositions which are cathodically deposited on electrodeposition of paints containing the coating compositions and a process for producing aqueous solutions of the self-crosslinking coating compositions by acid neutralization are described. The coating compositions are the reaction products of a resin carrying amine groups and hydroxyl or carboxyl groups, and the reaction product carrying one free isocyanate group of a polyisocyanate and at least one ethylenically unsaturated monomer having at least one isocyanate reactive hydrogen atom and the group ##STR1## The cathodically depositable electrodeposition paints cure rapidly at relatively low temperatures to provide films which are highly resistant to corrosive influences.

Cathodically depositable coating compositions and process for same

Process of producing, and binders water soluble upon neutralization with acids which are depositable at the cathode of an electrodeposition system and can be crosslinked through thermic polymerization without additional crosslinking components characterized in that (A) 1 mole of an isocyanate having the formula OCN--R--(NCO).sub.n, in which R is an aromatic, aliphatic or cycloaliphatic hydrocarbon radical and n is 1 or 2, is reacted at from 0.degree.-50.degree. C., with

Thermosetting binders for cathodic deposition in electrodeposition paints

Self-crosslinking coating compositions which are cathodically deposited on electrodeposition of paints containing the coating composition and a process for producing aqueous solutions of the self-crosslinking coating compositions by acid neutralization are described. The coating compositions are the reaction products of an unsaturated copolymer or a polycondensation product or a polyaddition product or mixture thereof carrying at least 0.5 double bonds on a side chain or at the end of a chain for each 1000 molecular weight units and the reaction product carrying one free isocyanate group of a polyisocyanate with an amine of the general formula -- ##STR1## wherein R is an alkanol or hydroxyphenyl radical and R.sub.1 and R.sub.2 are alkyl, aryl or cycloalkyl radicals. The cathodically depositable electrodeposition paints cure rapidly at relatively low temperatures to provide films which are highly resistant to corrosive influences.

Cathodically depositable urethane compositions and process for same

Binders for cathodically depositable aqueous coating compositions comprising the reaction product, having an NCO-value of zero, of

Cathodically depositable resins and process of preparing same

Binders for cathodically depositable aqueous coating compositions comprising the reaction product of (A) one mole polyisocyanate with (B) at least one mole dialkylalkanolamine and a monohydroxyalkyl(meth)acrylate and/or monohydroxyalkoxy(meth)acrylate and/or a monohydroxyallylether of a polyol. Optionally, there can be included a saturated and/or unsaturated fatty alcohol or fatty acid. The binders have an NCO-value of substantially zero; a molecular weight of from about 500 to 5000, and in each 1000 molecular weight unit a basic content of from about 0.5 to 3 and a double bond content of from about 0.5 to 4. The binders in coating compositions cure at relatively low temperatures and relatively short curing times to provide films having excellent resistance to water, chemicals, and corrosion.

Self-crosslinking cationic polyurethane based electrodepositable binders

Aqueous emulsions of binders for cathodically depositable aqueous coating compositions comprising emulsions of 10 to 99.9 percent by weight of a self-crosslinking polycondensation resin or polymerization resin, and 0.1 to 90 percent by weight of one or more basic urethane component which is the reaction product of (A) 1 mole of polyisocyanate with (B) at least 1 mole dialkylalkanolamine and a monohydroxyalkyl(meth)acrylate and/or a monohydroxyalkoxy(meth)acrylate and/or a monohydroxyallylether of a polyol. Component (B) whch optionally can include a saturated and/or unsaturated fatty alcohol or fatty acid will have an NCO-value of substantially zero. The basic content of the emulsion is at least 0.5, and the double bond number is at least 0.5. The emulsions have excellent stability without use of additional emulsifiers and films obtained from coating compositions containing the emulsions have good adhesion characteristics, cure at relatively low temperatures and relatively short curing times to provide films having excellent resistance to water, chemicals, and corrosion.

Self-crosslinking cationic resin emulsions for use in electrodeposition

Aqueous emulsions of binders for cathodically depositable aqueous coating compositions comprising emulsions of (A) 98 to 50 percent by weight of at least one water-soluble self-crosslinking cationic resin which is water-dilutable upon partial or total neutralization with an inorganic or organic acid and having at least 0.5 basic nitrogen atoms in 1000 molecular weight units and a double bond number of at least 0.5; and (B) 2 to 50 percent by weight of a water-insoluble self-crosslinking polycondensation resin or polymerization resin having a double bond number of at least 0.8. Optionally, the water-insoluble self-crosslinking resin can include basic character but insufficient to provide water solubility. The emulsions have excellent stability without use of other emulsifiers even in substantially diluted form usual for electrodeposition baths. The emulsions when used in coating compositions provide films which have good adhesion characteristics, cure at relatively low temperatures and relatively short curing times to provide films having excellent resistance to water, chemicals, and corrosion.

Self-crosslinking resin emulsions for cathodically depositable coating

Heat curable binders for use in cathodically depositable aqueous coating compositions characterized in that curing is through alpha, beta-double bonds on end or side chains of the binders are described. The binders are the reaction product of 2 moles of a diepoxide; 1 mole of a secondary-secondary or primary-tertiary diamine; 2 moles of monocarboxylic acid, and an alpha, beta-unsaturated monoisocyanate, and have an alpha, beta-functionality of from about 0.8 to 2.5. The binders are rendered water soluble by neutralization with inorganic and/or organic acids. Coating compositions comprising such binders cure at low temperatures and short curing times to provide films having excellent resistance to water, chemicals, and corrosion.

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Graz, Austria

Georgios Pampouchidis