Aqueous Cross-linking Compositions and Methods

A method of preparing a water-borne composition, comprising:

• combining a blocked cross-linking agent comprising at least one hydrazone group and an aqueous dispersion of one or more cross-linkable polymers, wherein at least one polymer in the dispersion is formulated from one or more monomers of which at least one is a monomer that yields acetaldehyde as a hydrolysis product, and comprises one or more carbonyl groups, one or more epoxy groups, or both one or more carbonyl groups and one or more epoxy groups.

A method of making a cross-linked polymeric material, which comprises combining

• an aqueous dispersion containing a first polymer moiety having incorporated therein one or more carbonyl groups, one or more epoxy groups, or both one or more carbonyl groups and one or more epoxy groups, and a second polymer moiety having incorporated therein one or more carbonyl groups, one or more epoxy groups, or both one or more carbonyl groups and one or more epoxy groups, at least one of said polymer moieties being formulated from one or more monomers of which at least one is a monomer that yields acetaldehyde as a hydrolysis product;
• and
• a blocked cross-linking agent having at last one hydrazone group incorporated therein.

A method of coating a surface, comprising:

• applying an water-borne polymeric dispersion on a surface, wherein the aqueous polymeric dispersion comprises water, one or more polymers, and a blocked cross-linking agent comprising at least one hydrazone group, wherein at least one of the polymers is formulated from one or more monomers of which at least one is a monomer that yields acetaldehyde as a hydrolysis product, and comprises one or more carbonyl groups, one or more epoxy groups or a combination of one or more carbonyl groups and one or more epoxy groups.

A method of preparing a water-borne composition, comprising:

• combining an aqueous dispersion of one or more cross-linkable polymers, wherein at least one polymer in the dispersion is formulated from one or more monomers of which at least one is a monomer that yields acetaldehyde as a hydrolysis product, and has functionality capable of interacting with a cross-linking agent, and a blocked cross-linking agent that is not capable of reacting with either said acetaldehyde or said functionality but is convertible via an equilibrium reaction to said cross-linking agent.

A method of making a cross-linked polymeric material, which comprises combining

• an aqueous dispersion of a first polymer moiety and a second polymer moiety, each of said polymer moieties comprising functionality capable of reacting with a cross-linking agent, at least one of said copolymer moieties being formulated from one or more monomers of which at least one is a monomer that yields acetaldehyde as a hydrolysis product;
• and
• a blocked cross-linking agent that is not capable of reacting with either said acetaldehyde or said functionality but is convertible via an equilibrium reaction to said cross-linking agent.

A method of depositing adherent material on a surface, comprising:

• applying an water-borne polymeric dispersion on a surface, wherein the water-borne polymeric dispersion comprises water, one or more polymers formulated from one or more monomers of which at least one is a monomer that yields acetaldehyde as a hydrolysis product, and which include functionality capable of reacting with a cross-linking agent, and a blocked cross-linking agent that is not capable of reacting with either said acetaldehyde or said functionality but is convertible via an equilibrium reaction to said cross-linking agent.