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US 6,641,064 B1Granted
Complete drying method for hydrogels
AssigneeBASF SE
InventorsJoachim Dentler, Norbert Herfert, Helmut Klotzsche, Rudolf Schliwa, Uwe Stüven
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Abstract
Hydrogel particles are produced by a drying step followed sequentially by precomminuting, grinding, separating, and further drying of coarse particles.
Claims7
A process for drying a hydrogel, which comprises the following successive steps:
- a) drying said hydrogel by contact or convective drying
- b) precomminuting the contact or convectively dried hydrogel
- c) grinding the precomminuted hydrogel using a coarse or crusher roll mill
- d) separating off the moist resilient hydrogel particles which have a water content of more than 10% by weight
- e) afterdrying said moist resilient hydrogel particles.
2 more elements
Dependencies are inferred from the claim text.