Process for producing a polyurethane composition

A continuous process for preparing a polyurethane composition comprising the steps of:

• (A) mixing
• (a) at least one polyalkylene glycol having a water content in the range of ≥0.0 to ≤0.1 wt.-% by weight of the polyalkylene glycol,
• (b) at least one compound selected from the group consisting of C4 to C30 alcohols, C4 to C30 alcohol alkoxylates and C4 to C30 alkyl phenol alkoxylates,
• (c) at least one polyisocyanate, and
• (d) at least one catalyst,
• at a temperature in the range of ≥50° C. to ≤80° C. to obtain a reaction feed stream,
• (B) subjecting the reaction feed stream of step (A) in at least one reactor to a temperature in the range of ≥80° C. to ≤150° C. and a residence time in the range of 0.05 h to ≤4 h to obtain a polyurethane;
• wherein the viscosity of the polyurethane obtained in step (B) is in the range of ≥1 Pa·s to ≤5000 Pa·s at a temperature of 100° C.;
• and
• (C) adding water to the polyurethane of step (B) to obtain a polyurethane composition, characterized in that the difference between the temperature in step (B) and the temperature in step (A) is in the range of ≥10° C. to ≤50° C.;
• wherein, step (A) and step (B), independent of each other, is carried out in the static mixer.