Aqueous dispersions of polyurethane compositions
AssigneeLubrizol Advanced Materials, Inc.
InventorAnthony D. Pajerski
Life of this patent
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Abstract
An aqueous dispersion of polyurethane composites is made by forming a mixture of urethane prepolymer or polymer, ketone functional molecule/oligomers, and hydrazine functional molecule/oligomers; and dispersing the mixture so made in aqueous medium.
Claims25
An aqueous dispersion of polyurethane comprising:
- a) a urethane polymer or prepolymer,
- b) a ketone functional molecule having a number average molecular weight of less than 2000 Daltons having at least one ketone functional moiety and wherein ketone functional molecule is characterized by a separation of at least 7 intervening atoms between the reactive carbonyl group of said ketone functional molecule and any basic nitrogen atoms,
- c) at least one molecule of number average molecular of less than 2000 Daltons having at least one hydrazine moiety co-reactive with said ketone function moiety, and
- d) water.
A process for making an aqueous dispersion of urethane prepolymer or polymer, comprising the steps of:
- a) forming a urethane prepolymer or polymer of at least 2000 Daltons number average molecular weight from one or more polyol reactants and one or more isocyanate reactants,
- b) adding a ketone functional molecule having a number average molecular weight of less than 2000 Daltons to said urethane prepolymer or polymer and wherein ketone functional molecule is characterized by a separation of at least 7 intervening atoms between the reactive carbonyl group of said ketone functional molecule and any basic nitrogen atoms,
- c) dispersing at least the urethane prepolymer or polymer in an aqueous phase as discrete particles, and
- d) adding a molecule having at least one hydrazine moiety to the other components containing a urethane polymer or prepolymer, and/or a -ketone functional molecule to form azomethine linkages between the ketone functional molecule and said molecule having at least one hydrazine moiety.
An aqueous dispersion of polyurethane comprising:
- a) a urethane polymer or prepolymer,
- b) a ketone functional molecule derived from reacting a C3-C20 ketone or aldehyde containing carboxylic acid with 1) an epoxidized triglygeride or 2) an epoxidized polyester, said ketone functional molecule being characterized by having a number average molecular weight from about 500 to about 50,000 Daltons and having at least one ketone or aldehyde functional moiety,
- c) at least one molecule having at least one hydrazine moiety co-reactive with said ketone functional molecule, and
- d) water.
An aqueous dispersion of polyurethane comprising:
- a) a urethane polymer or prepolymer,
- b) a ketone functional molecule derived from reacting a C3-C20 ketone or aldehyde containing carboxylic acid with the di or poly hydroxyl or di or poly epoxy functionalized 1) linear, branched, or cyclic aliphatic or aromatic alcohol;
- 2) a self condensation reaction product for one or more C2-C20 linear, branched, or cyclic aliphatic or aromatic alcohol;
- 3) an C2-C4 alkoxylate extended C2-C20 linear, branched, or cyclic aliphatic or aromatic alcohol;
- and/or 4) an C2-C4 alkoxylate extended a self condensation reaction product for one or more C2-C20 linear, branched, or cyclic aliphatic or aromatic alcohol;
- said ketone functional molecule being characterized by having a number average molecular weight from about 150 to about 50,000 Daltons and having at least one ketone or aldehyde functional moiety, wherein aliphatic or aromatic alcohol is defined to include aliphatic substituted aromatic alcohols and aromatic substituted aliphatic alcohols,
- c) at least one molecule having at least one hydrazine moiety co-reactive with said ketone functional moiety, and
- d) water.
An aqueous dispersion according to claim, 22, wherein said ketone functional molecule has an average of from 2.5 to 6 ketone groups per molecule and said dispersion optionally includes acrylic monomers and/or acrylic polymer.
Dependencies are inferred from the claim text.