Abstract: Ambient or low-temperature curable aqueous dispersions of (1) an emulsion polymer containing units polymerized from a monomer mixture of (a) from about 0.25% to about 10% by weight of a polymerizable aldehyde, (b) from about 0.5% to about 10% by weight of an ethylenically unsaturated carboxylic acid, and (c) up to about 99.25% by weight of at least one copolymerizable mono-ethylenically unsaturated monomer, with (2) a curing agent selected from the group of dicarboxylic acid bis-hydrazides and bis-hydrazones are disclosed. The dispersions are useful in leather treating compositions, especially in top coat compositions. A process for producing fully finished leather, or leather substitutes is also disclosed.

Abstract: A method is disclosed for improving the solubility of Lewis acid dyes including metal chelate dyes and acid dyes, in solvents employing a copolymer based on a monomer containing a 5- or 6-membered heterocyclic tertiary amine. Dye solutions prepared by this process are useful in dyeing leather, in dyeing coatings and plastic articles, and are especially useful in combination with reactive urethane systems.

Abstract: A method is disclosed for improving the solubility of Lewis acid dyes including metal chelate dyes and acid dyes, in solvent employing a 5- or 6-membered heterocyclic tertiary amine. Dye solutions prepared by this process are useful in dyeing leather, in dyeing coatings and plastic articles, and are especially useful in combination with reactive urethane systems.