CONTINUOUS PREPARATION OF AQUEOUS SECONDARY POLYACRYLATE DISPERSIONS

摘要

O.Z. 0050/42977 Aqueous secondary polyacrylate dispersions having a long shelf life and based on the polyacrylate resin systems are prepared by means of intensively dispersing screw extruders by a continuous process, on which the preparation of the secondary dispersion is carried out, after neutralization of the solvent-free copolymer melt or of the dissolved copolymer, in the shearing section of the screw extruder, and the specific energy input is 0.001-0.25 kWh/kg, the residence time in the shear field is 0.1-120 sec and the shear gradient is 1,000-12,000 1/sec.