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US 2026/0193423 A1Published application
Method for producing colour-stable super-absorber particles
AssigneeBASF SE
InventorsChristian HILS, Christophe BAUDUIN, Jan Niclas GORGES
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Abstract
The present invention relates to a process for producing color-stable superabsorbent particles, wherein an aqueous monomer solution or suspension is polymerized to a polymer gel, the resultant polymer gel is optionally comminuted, the polymer gel is then dried, the dried polymer gel is optionally ground and classified, wherein a pyrazole is added prior to the drying and the aqueous monomer solution or suspension comprises a polymerization inhibitor other than the pyrazole.
Claims15
A process for producing surface postcrosslinked superabsorbent particles, comprising:
- polymerizing an aqueous monomer solution or suspension to a polymer gel;
- optionally comminuting the polymer gel;
- drying the polymer gel;
- optionally grinding and classifying the dried polymer gel;
- and
- optionally thermally surface postcrosslinking and cooling the dried polymer gel;
- wherein:
- the aqueous monomer solution or suspension comprises:
- a) at least one ethylenically unsaturated carboxylic acid that has been at least partly neutralized,
- b) at least one crosslinker, and
- c) at least one initiator;
- and
- at least one pyrazole is added prior to drying;
- and
- the aqueous monomer solution or suspension comprises at least one polymerization inhibitor other than the pyrazole.
12 more elements
Dependencies are inferred from the claim text.