Method for producing polyurethane emulsion

Details Method for producing polyurethane emulsion Method for producing polyurethane emulsion

2007-08-07

2007-08-07

Niland, Patrick (Department: 1714)

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...

C422S131000, C422S134000, C422S135000, C422S225000, C523S319000, C523S324000, C523S335000, C524S589000, C524S590000, C524S839000, C524S840000

Reexamination Certificate

active

10491889

ABSTRACT:
The present invention provides a process for producing a polyurethane emulsion, capable of continuously producing a polyurethane emulsion which contains substantially no organic solvent and also has excellent storage stability over time. Disclosed is a process for producing a polyurethane emulsion by emulsifying a urethane prepolymer, which contains substantially no organic solvent and also has at least two isocyanate groups per one molecule, with water and completing chain extension, the process comprising (1) a first step of supplying the urethane prepolymer and water in an emulsifying apparatus comprising a stator section5fixed inside a cylindrical casing1and a rotor section3fixed to a rotational shaft2in the casing1, the rotor section3having multiple rotor teeth4, the stator section5having multiple stator teeth6, which stand face to face with the rotor teeth4, the stator section5having an inlet8and an outlet10, from the inlet8, continuously emulsifying them to obtain an emulsion of the urethane prepolymer having an average particle size of 0.1 to 2.5 μm, and discharging the emulsion from the outlet10, and (2) a second step of reacting the emulsion of the urethane prepolymer obtained in the first step with a chain extender, thereby completing chain extension of the urethane prepolymer.

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