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US 8,901,244 B2Granted
Aqueous dispersions of polyurethane/acrylic hybrid compositions
AssigneeLubrizol Advanced Materials, Inc.
InventorAnthony D. Pajerski
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Abstract
An aqueous dispersion of polyurethane/acrylic polymer hybrid composites is made by forming a mixture of urethane prepolymer or polymer, acrylic monomer or polymer, ketone functional molecule/oligomers, and hydrazine functional molecule/oligomers; and dispersing the mixture so made in aqueous medium.
Claims8
An aqueous dispersion of urethane polymer composition comprising:
- a) a urethane polymer or prepolymer having lateral chain pendant groups with ketone functional moiety(ies) wherein said lateral side chain pendant groups with ketone moiety(ies) are free of basic nitrogen groups;
- said ketone functional moiety(ies) selected from ketone groups,
- b) a molecule with two or more hydrazine functional moieties characterized by a number average molecular weight of less than 2000 Daltons, said hydrazine functional moieties and said ketone functional moiety being capable of forming azomethine linkages to crosslink said urethane polymer,
- and wherein said dispersion includes acrylic monomers and/or acrylic polymer.
1 more element
Dependencies are inferred from the claim text.