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...

2008-03-18

2008-03-18

Niland, Patrick (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C428S423100, C523S318000, C523S319000, C523S324000, C523S353000, C524S839000, C524S840000, C528S50200C

Reexamination Certificate

active

11099160

ABSTRACT:
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 homogenization of the pre-emulsion from step a) in a multi-step homogenizing nozzle. Paint films containing the aqueous polyurethane dispersion produced by the process can be used to coat substrates.

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