Water based hydroxyalkyl carbamate-containing resins and method of making the same
AssigneeAmerican Cyanamid Company
InventorsWilliam Jacobs, III, Werner J. Blank
Life of this patent
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Abstract
A hydrophilic, substantially epoxy-free self-cross-linkable polymer contains hydroxyalkyl carbamate groups and one or more tertiary amine groups. The polymer suitably is made by reacting an epoxy resin having an average epoxy equivalent weight of from about 100 to about 700 with one or more amines having at least one secondary amine group and at least one hydroxyalkyl carbamate group or precursor thereof. A coating composition comprises an aqueous medium containing the polymer and, optionally, a cross-linking catalyst. A low temperature-curable coating is attained by utilization of the polymer with a suitable quaternary or ternary compound catalyst.
Claims31
A hydrophilic, substantially epoxy-free self-cross-linkable polymer containing hydroxyalkyl carbamate groups and one or more tertiary amine groups per molecule.
A hydrophilic, substantially epoxy-free polymer which is self-cross-linkable through urethane groups comprising a hydroxyalkyl carbamate-containing resin having more than one tertiary amine group and more than two hydroxyalkyl carbamate groups per molecule, said polymer containing from about 3.5 to about 5.7 meq hydroxyalkyl carbamate per gram of resin solids and being obtained by reaction of epoxy groups of one or more epoxides with a secondary amine group of one or more amines containing hydroxyalkyl carbamate groups or precursors thereof, said epoxide having an average epoxy equivalent weight of from about 100 to about 700.
A method of preparing a hydrophilic self-cross-linkable polymer comprising reacting (a) an epoxide having an average epoxy equivalent weight of from about 100 to about 700, 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;
- the reactants (a) and (b) being selected to form said polymer with from about 3.5 to about 5.7 meq hydroxyalkyl carbamate per gram of resin solids.
A coating composition comprising a hydrophilic, self-cross-linkable polymer containing hydroxyalkyl carbamate groups and one or more tertiary amine groups, in a liquid medium.
Dependencies are inferred from the claim text.