| abstract |
Process for the continuous production of aqueous polyurethane dispersions by mixing a product which has been obtained by reacting polyisocyanates with compounds of molecular weight from about 400 to about 10,000 which contain at least two groups which are reactive toward isocyanates, optionally with the use of further starting products and / or additives, with water, which may contain additives, characterized in that the mixing of the polyisocyanate reaction product with water takes place in a co-current reactor, one of the components to be mixed or a mixture containing one of the two components to be mixed being compressed to a pre-pressure of about 20 to about 500 bar is and expanded through a coaxial nozzle 1 in the short-term mixing tube 2 and mixed with the other component or a mixture containing the other component. |