Cathodically depositable urethane compositions and process for same

Process for producing self-crosslinking coating compositions for cathodically depositable electrodeposition paints including the steps of reacting (A) an unsaturated copolymer or a polycondensation reaction product or a polyaddition reaction product or mixture thereof carrying at least 0.5 ethylenically unsaturated bonds on a side chain or at the end of a chain for each 1000 molecular weight units;

• with (B) a sufficient amount to render the coating composition water dilutable when reacted with an inorganic or organic acid, of a mixed isocyanate intermediate of (a) 1 mole of diisocyanate, (b) 0.4 to 0.9 moles of a tertiary alkanolamine, and (c) 0.1 to 0.6 moles of a hydroxyalkylacrylate or methacrylate with at least 6 C-atoms and a monoalcohol with at least 6 C-atoms, the mole sum of the components (b) and (c) being 1.0;
• and reacting the reaction product of (A) and (B) with an inorganic acid or an organic acid or mixtures thereof to provide a water-soluble coating composition.

Process for producing self-crosslinking coating compositions for cathodically depositable electrodeposition paints including the steps of reacting (A) an unsaturated copolymer or a polycondensation reaction product or a polyaddition reaction product or mixture thereof carrying at least 0.5 ethylenically unsaturated bonds on a side chain or at the end of a chain for each 1000 molecular weight units;

• with (B) a sufficient amount to render the coating composition water dilutable when reacted with an inorganic or organic acid, of a mixed isocyanate intermediate of (a) 1 mole of diisocyanate, (b) 0.4 to 0.9 moles of a tertiary alkanolamine, and (c) 0.1 to 0.6 moles of a monocarboxylic acid with at least 6 C-atoms, the mole sum of the components (b) and (c) being 1.0;
• and reacting the reaction product of (A) and (B) with an inorganic acid or an organic acid or mixtures thereof to provide a water-soluble coating composition.

Self-crosslinking coating composition which will cathodically deposit upon electrodeposition which is the reaction product of (A) an unsaturated copolymer or a polycondensation product or a polyaddition product or mixture thereof carrying at least 0.5 ethylenically unsaturated bonds on a side chain or at the end of a chain for each 1000 molecular weight units;

• and (B) a sufficient amount to render the coating composition water dilutable when reacted with an inorganic or organic acid, of a reaction product carrying one free isocyanate group of an aromatic or aliphatic or cycloaliphatic polyisocyanate or mixtures thereof and an amine of the general formula ##STR6## wherein R is an alkanol or hydroxyphenyl radical and R.sub.1 and R.sub.2 are alkyl, aryl, or cycloalkyl radicals.

Self-crosslinking coating composition which will cathodically deposit upon electrodeposition which is the reaction products of (A) an unsaturated copolymer or a polycondensation reaction product or a polyaddition reaction product or mixture thereof carrying at least 0.5 ethylenically unsaturated bonds on a side chain or at the end of a chain for each 1000 molecular weight units;

• (B) a sufficient amount to render the coating composition water dilutable when reacted with an inorganic or organic acid, of a reaction product carrying one free isocyanate group of an aromatic or aliphatic or cycloaliphatic polyisocyanate or mixtures thereof and an amine of the general formula ##STR7## wherein R is an alkanol or hydroxyphenyl radical and R.sub.1 and R.sub.2 are alkyl or aryl or cycloalkyl radicals;
• and (C) from about 10 to 100 mole-%, calculated on the sum of the still free hydroxy and carboxy groups, of a reaction product carrying one free isocyanate group, obtained from an aliphatic or aromatic or cycloaliphatic polyisocyanate and mixtures thereof and a hydroxy alkyl acrylate or methacrylate with at least 6 C-atoms;
• a saturated or unsaturated monoalcohol with at least 6 C-atoms and mixtures thereof.

Self-crosslinking coating composition which will cathodically deposit upon electrodeposition which is the reaction products of (A) an unsaturated copolymer or a polycondensation reaction product or a polyaddition reaction product or mixture thereof carrying at least 0.5 ethylenically unsaturated bonds on a side chain or at the end of a chain for each 1000 molecular weight units;

• (B) a sufficient amount to render the coating composition water dilutable when reacted with an inorganic or organic acid, of a reaction product carrying one free isocyanate group of an aromatic or aliphatic or cycloaliphatic polyisocyanate or mixtures thereof and an amine of the general formula ##STR8## wherein R is an alkanol or hydroxyphenyl radical and R.sub.1 and R.sub.2 are alkyl or aryl or cycloalkyl radicals;
• and (C) from about 10 to 100 mole-%, calculated on the sum of the still free hydroxy and carboxy groups, of a reaction product carrying one free isocyanate group, obtained from an aliphatic or aromatic or cycloaliphatic polyisocyanate and mixtures thereof and an unsaturated or saturated monocarboxylic acid or mixtures thereof with at least 6 C-atoms.