Abstract:
The invention relates to a method for producing water-absorbing polymer particles, wherein at least one aliphatic aldehyde or the conversion product thereof has an aliphatic alcohol, an aliphatic amine, ammonia, a hypophosphite, or a phosphite added thereto.
Abstract:
A superabsorbent having superior permeability and conveying properties comprises a permeability enhancing agent and a cohesion control agent and has a free swell gel bed permeability of at least 15 Darcies and a Hausner ratio in the range of 1.18 to 1.34.
Abstract:
The invention relates to a method for the thermal surface post-crosslinking of water-absorbing polymer particles, wherein the polymer particles are coated with an aqueous solution, the coated polymer particles are disaggregated, and the disaggregated polymer particles are thermally surface post-crosslinked by means of a drum-type heat exchanger having an inverse screw flight.
Abstract:
The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, which comprises thermal postcrosslinking in the presence of steam.
Abstract:
A process for producing water-absorbing polymer particles with low caking tendency and high absorption under pressure, comprising polymerization of a monomer solution or suspension, drying of the resulting polymer gel, grinding, classifying, thermal surface postcrosslinking and coating with silica, wherein the water-absorbing polymer particles have been coated with aluminum cations before, during or after the surface postcrosslinking.
Abstract:
The invention relates to a method for producing water-absorbing polymer particles through polymerization of drops of a monomer solution in a surrounding gas phase, wherein the polymer particles are coated with a permeability improving agent.