Process for the continuous production of an aqueous...

Details Process for the continuous production of an aqueous... Process for the continuous production of an aqueous...

C - Chemistry, Metallurgy

08

L

C08L 75/12 (2006.01) C08G 18/08 (2006.01) C08J 3/03 (2006.01) C09D 175/12 (2006.01)

Patent

CA 2504412

A process for the continuous production of an aqueous polyurethane dispersion based on at least one aliphatic and/or aromatic polyisocyanate is described, which is characterised by the following steps: a) production of an aqueous pre-emulsion by mixing a polyurethane prepolymer containing hydrophilic and/or potentially hydrophilic groups with water in a mixing nozzle, wherein the polyurethane prepolymer is injected into the water; b) formation of an emulsion by homogenisation of the pre-emulsion from step a) in a multi-step homogenising nozzle. Paint films containing the aqueous polyurethane dispersion produced by the process can be used to coat substrates.

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