Absorbent compositions
AssigneeBASF SE
InventorsVolker Frenz, Norbert Herfert, Ulrich Riegel, William E. Volz, Thomas H. Majette, James Hill
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Abstract
Described is a water-absorbent composition containing from 30 to 100% by weight, based on the water-absorbent composition, of water-insoluble water-swellable hydrogels characterized by the following features: Centrifuge Retention Capacity (CRC) of at least 24 g/g, Saline Flow Conductivity (SFC) of at least 80×10−7 cm3 s/g and Free Swell Rate (FSR) of at least 0.15 g/g s and/or Vortex Time of not more than 160 s.
Claims11
A water-absorbent composition containing from 30 to 100% by weight, based on the water-absorbent composition, of water-insoluble water-swellable hydrogels characterized by the following features:
- Centrifuge Retention Capacity (CRC) of at least 24 g/g,
- Saline Flow Conductivity (SFC) of at least 80×10−7 cm3 s/g and
- Free Swell Rate (FSR) of at least 0.15 g/g s and/or Vortex Time of not more than 160 s.
The method for improving the performance profile of water-absorbent compositions by enhancing the permeability, capacity and swell rate of the water-absorbent compositions by use of water-insoluble water-swellable hydrogels characterized by the following property spectrum:
- Centrifuge Retention Capacity (CRC) of at least 24 g/g,
- Saline Flow Conductivity (SFC) of at least 80×10−7 cm3 s/g and
- Free Swell Rate (FSR) of at least 0.15 g/g s and/or Vortex Time of not more than 160 s,
- in the water-absorbent compositions.
The method for determining water-absorbent compositions possessing high permeability, capacity and swell rate by measuring the Centrifuge Retention Capacity (CRC), Saline Flow Conductivity (SFC), Free Swell Rate (FSR) and/or Vortex Time for water-insoluble water-swellable hydrogels present in a given water-absorbent composition and determining the water-absorbent compositions whose hydrogels are characterized by the following property spectrum:
- CRC of at least 24 g/g,
- SFC of at least 80×10−7 cm3 s/g and
- FSR of at least 0.15 g/g s and/or Vortex Time of not more than 160 s.
The use of water-absorbent compositions containing water-insoluble water-swellable hydrogels characterized by the following features:
- Centrifuge Retention Capacity (CRC) of at least 24 g/g,
- Saline Flow Conductivity (SFC) of at least 80×10−7 cm3 s/g and
- Free Swell Rate (FSR) of at least 0.15 g/g s and/or Vortex Time of not more than 160 s,
- in hygiene articles or other articles for absorbing aqueous fluids to enhance the permeability, capacity and swell rate.
Dependencies are inferred from the claim text.