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US 7,915,363 B2Granted
Acidic superabsorbent hydrogels
AssigneeBASF SE
InventorsRüdiger Funk, Norbert Herfert, Mariola Wanior, Uwe Stüven, Martin Beck
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Abstract
The present invention relates to novel hydrophilic swellable addition polymers comprising improved odor control, a process for their preparation and their use for absorbing aqueous fluids and a process for screening superabsorbents.
Claims19
A hydrogel-forming polymer capable of absorbing aqueous fluids and having a pH absorbency index pHAI of at least 90 and a pH of not more than 5.7, wherein pHAI is calculated as follows:
- pHAI=ΔpH (AUL0.7 psi+CRC),
- wherein ΔpH=7-pH of product, AUL 0.7 psi is an absorbency under pressure at 0.7 psi, and CRC is a centrifuge retention capacity.
A hygiene article comprising
- (A) a liquid pervious topsheet,
- (B) a liquid impervious backsheet,
- (C) a core positioned between (A) and (B), said core comprising 10% to 100%, by weight, of the hydrogel-forming polymer of claims 1 and 0% to 90%, by weight, of hydrophilic fiber material,
- (D) optionally a tissue layer positioned directly above and below said core (C), and
- (E) optionally an acquisition layer positioned between (A) and (C).
2 more elements
Dependencies are inferred from the claim text.