| abstract |
(57) [Summary] [Structure] The pre-emulsified liquid mixture is introduced into the channel in the chamber under pressure, and the liquid mixture is added at 50 to 10,000 Kg / cm 2. To emulsify a premixed liquid of water and a polyurethane resin with a device for emulsifying by colliding with a flat part in the flow passage under the pressure of or by colliding the mixed liquids in the flow passage under the pressure. A method for producing an aqueous polyurethane resin dispersion, which comprises: [Effect] According to this production method, under conditions where the amount of emulsifier or hydrophilic group used is smaller than before, a polyurethane resin having extremely fine resin particles and a uniform particle size distribution, and excellent long-term stability and mechanical stability. An aqueous dispersion is obtained. |