Cationic electrocoating compositions, method of making, and use
First Claim
1. An electrodepositable composition comprising:
- (A) an active hydrogen-containing cationic resin, electrodepositable on a cathode, comprising;
(1) a polyepoxide;
(2) an oxygen-substituted diamine compound having the following formula;
##STR3## where n is an integer from 2 to 4; and
where R1 or R2 are the same or different and are selected from the group consisting of;
1) R1, R2, and both contain at least one oxygen and are alkyl or cycloalkyl, having from 1 to 6 carbon atoms;
2) R1, R2 and both are alkanol groups having from 2 to 6 carbon atoms; and
3) R1, R2, and both contain at least one oxygen and have 1 to 6 carbon atoms and form a cyclic group with the N atom of the tertiary amine group;
wherein the oxygen substituted diamine is an amine reactant for the polyepoxide to form an epoxide amine resinous adduct and is present in an amount of about 30 to 100 percent of the NH equivalents for the active hydrogen-containing cationic resin and on a weight basis is the predominant amine as an amine reactant to form the epoxide amine resinous adduct for the active hydrogen-containing cationic resin; and
(B) at least partially blocked isocyanate curing agent, and wherein the electrodepositable composition is essentially free of polyoxyalkylene polyamine.
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Accused Products
Abstract
An electrodepositable composition that has: (A) an active hydrogen-containing cationic resin, electrodepositable on a cathode, having: (1) a polyepoxide; (2) an oxygen-substituted diamine compound having the following formula: ##STR1## where n is an integer from 2 to 4; and where R1 or R2 are the same or different and either one or both contain at least one oxygen and are alkyl, cycloalkyl, substituted alkyl, or substituted cycloalkyl having from 1 to 6 carbon atoms, or R1 and R2 are alkanol groups having from 2 to 6 carbon atoms, or R1, R2, and the N atom form a cyclic group which is substituted or unsubstituted such as morpholine and 1-(3-aminopropyl) imidazole; and (B) at least partially blocked isocyanate or polyisocyanate curing agent. The diamine compound of Formula I can be used alone or in conjunction with one or more secondary amines, nonhydroxy group containing amines and/or amines with ring structures. Optionally, the polyepoxide can be chain extended with active hydrogen-containing compounds other than polyoxyalkylene polyamines. Also provided is a method of producing an active hydrogen-containing cationic resin composition, electrodepositable on a cathode, comprised of (a) mixing together in a suitable reaction vessel a polyepoxide, or the precursors of the polyepoxide, a polycarboxylic acid, a blocked isocyanate curing agent; (b) adding to the mixture of (a) a base catalyst and the diamine compound of Formula I; (c) polymerizing the mixture of (b) to form a resinous composition; and (d) neutralizing the resinous composition of (c) by adding the resinous composition to a dilute mixture of acid and water to form an aqueous dispersed electrodepositable cationic resin composition.
92 Citations
14 Claims
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1. An electrodepositable composition comprising:
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(A) an active hydrogen-containing cationic resin, electrodepositable on a cathode, comprising; (1) a polyepoxide; (2) an oxygen-substituted diamine compound having the following formula;
##STR3## where n is an integer from 2 to 4; and
where R1 or R2 are the same or different and are selected from the group consisting of;
1) R1, R2, and both contain at least one oxygen and are alkyl or cycloalkyl, having from 1 to 6 carbon atoms;
2) R1, R2 and both are alkanol groups having from 2 to 6 carbon atoms; and
3) R1, R2, and both contain at least one oxygen and have 1 to 6 carbon atoms and form a cyclic group with the N atom of the tertiary amine group;
wherein the oxygen substituted diamine is an amine reactant for the polyepoxide to form an epoxide amine resinous adduct and is present in an amount of about 30 to 100 percent of the NH equivalents for the active hydrogen-containing cationic resin and on a weight basis is the predominant amine as an amine reactant to form the epoxide amine resinous adduct for the active hydrogen-containing cationic resin; and(B) at least partially blocked isocyanate curing agent, and wherein the electrodepositable composition is essentially free of polyoxyalkylene polyamine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of producing an active hydrogen-containing cationic resin composition, electrodepositable on a cathode, comprising:
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(a) mixing together in a suitable reaction vessel a polyepoxide, or the precursors of the polyepoxide, and an at least partially blocked isocyanate curing agent; (b) adding to the mixture of (a) a base catalyst and an oxygen-substituted diamine compound having the following formula;
##STR4## where n is an integer from 2 to 4; and
where R1 or R2 are the same or different and are selected from the group consisting of;
1) R1, R2, and both contain at least one oxygen and are alkyl or cycloalkyl, having from 1 to 6 carbon atoms;
2) R1, R2 and both are alkanol groups having from 2 to 6 carbon atoms; and
3) R1, R2, and both contain at least one oxygen and have 1 to 6 carbon atoms and form a cyclic group with the N atom of the tertiary amine group;wherein the oxygen substituted diamine is an amine reactant for the polyepoxide to form an epoxide amine resinous adduct and is present in an amount of about 30 to 100 percent of the NH equivalents for the active hydrogen-containing cationic resin and on a weight basis is the predominant amine as an amine reactant to form the epoxide amine resinous adduct for the active hydrogen-containing cationic resin; (c) polymerizing said mixture of (b) to form a resinous composition; and (d) neutralizing the resinous composition of (c) by adding the resinous composition to a dilute mixture of acid and water to form an aqueous dispersed cationic resin electrodepositable on a cathode from an electrodepositable composition that is essentially free of polyoxyalkylene polyamine. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification