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US 8,945,716 B2Granted
Process for producing water-absorbing polymer particles
AssigneeBASF SE
InventorsRoland Krauss, Thomas Gieger, Volker Klock
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Abstract
A process for producing water-absorbing polymer particles, comprising polymerization of a monomer solution or suspension, classification and drying of the resulting moist polymer gel, and comminution of the coarse fraction removed in the classification of the moist polymer gel, wherein the classification of the moist polymer gel is performed by means of a plurality of bar decks arranged in a cascade in a vibrating frame.
Claims15
A process for producing water-absorbing polymer particles, comprising
- A. polymerizing a monomer solution or suspension comprising
- a) at least one ethylenically unsaturated monomer which bears an acid group and optionally is partly neutralized,
- b) at least one crosslinker,
- c) at least one initiator,
- d) optionally one or more ethylenically unsaturated monomer copolymerizable with the monomer mentioned under a) and
- e) optionally one or more water-soluble polymer,
- B. classifying the resulting moist polymer gel, wherein the classifying of the moist polymer gel is performed by means of a plurality of bar decks arranged in a cascade in a vibrating frame,
- C. comminuting a coarse fraction removed in the classification of the moist polymer gel, then
- D. drying the resulting comminuted moist polymer gel.
6 more elements
Dependencies are inferred from the claim text.