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AssigneeAmerican Cyanamid Company
InventorsWilliam Jacobs, III, Girish G. Parekh, Werner J. Blank
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A cathodically electrodepositable, self-cross-linkable polymer is a hydroxyalkyl carbamate-containing resin having at least one tertiary amine and at least two hydroxyalkyl carbamate groups per molecule. The polymer is made by reacting an epoxy resin having an average epoxy equivalent weight of from about 300 to about 10,000 with one or more amines having at least one secondary amine group and at least one hydroxyalkyl carbamate group or precursor thereof. Hydrophobic amines may be co-reacted to enhance hydrophobicity of the polymer. An electrodeposition bath is made by acidifying the polymer to form an aqueous dispersion. A low temperature-curable coating is attained by utilization of the polymer with a suitable quaternary or ternary compound catalyst.
A cathodically electrodepositable, self-cross-linkable polymer containing hydroxyalkyl carbamate groups and one or more tertiary amine groups per molecule.
A cathodically electrodepositable self-cross-linkable polymer comprising a hydroxyalkyl carbamate-containing resin having more than one tertiary amine group and two or more hydroxyalkyl carbamate groups per molecule, said polymer further containing from about 0.6 to about 3.5 meq hydroxyalkyl carbamate per gram and from about 0.5 to about 5 meq amine per gram and being obtained by reaction of epoxy groups of one or more epoxides with a secondary amine group of one or more amines containing carbamate groups or precursors thereof, said epoxide having an average epoxy equivalent weight of from about 300 to about 10,000.
A method of preparing a cathodically electrodepositable, self-cross-linkable polymer comprising reacting (a) an epoxide having an average epoxy equivalent weight of from about 300 to about 10,000, with (b) an amine containing at least one secondary amine group and at least one group selected from the class consisting of hydrolyzable blocked primary amine groups and hydroxyalkyl carbamate groups, to form a substantially epoxy-free material and, when said blocked primary amine groups are present, hydrolyzing the same to unblock said primary amine groups and then reacting a cyclic carbonate with said primary amine groups to form said hydroxyalkyl carbamate groups;
An electrodeposition bath comprising an aqueous dispersion of an acidified, cathodically electrodepositable, self-cross-linkable polymer containing at least two hydroxyalkyl carbamate groups and at least one tertiary amine group per molecule, and obtained as the reaction product of (a) an epoxy resin having an average molecular weight of from about 300 to about 10,000, and (b) one or more amines having at least one secondary amine group and at least one hydroxyalkyl carbamate group or precursor thereof.
Dependencies are inferred from the claim text.