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US 6,414,214 B1Granted
Mechanically stable hydrogel-forming polymers
AssigneeBASF SE
InventorsFriedrich Engelhardt, Volker Frenz, Norbert Herfert, Ulrich Riegel, Matthias Weismantel, Wilfried Heide
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Abstract
Hydrogel-forming polymers which have: (i) a Saline Flow Conductivity of at least 40×10−7 cm3s/g; (ii) an AUL 0.7 psi (4826.5 Pa) of at least 20 g/g; and (iii) a Frangibility Index of at least 60%, are useful in hygienic articles such as incontinence briefs for adults and diapers for infants.
Claims29
Hydrogel-forming polymer having
- (i) a Saline Flow Conductivity (SFC) of at least 40×10−7 cm3s/g
- (ii) an AUL 0.7 psi (4826.5 Pa) of at least 20 g/g
- (iii) a Frangibility Index of at least 60%.
A process for producing a hydrogel-forming polymer having:
- (i) a Saline Flow Conductivity of at least 40×10−7 cm3s/g;
- (ii) an AUL 0.7 psi (4826.5 Pa) of at least 20 g/g;
- and
- (iii) a Frangibility Index of at least 60%;
- wherein said process comprises:
- (a) subjecting a polymer to a surface postcrosslinking step, to obtain a surface-postcrosslinked polymer;
- and
- (b) treating said surface-postcrosslinked polymer, to obtain a residual moisture content of at least 3% by weight.
5 more elements
A hygiene article comprising
- (A) a fluid-pervious topsheet
- (B) a fluid-impervious backsheet
- (C) a core positioned between (A) and (B) and comprising
- (C1) 10-100% by weight of a hydrogel-forming polymer;
- and
- (C2) 0-90% by weight of hydrophilic fiber material;
- wherein said hydrogel-forming polymer has:
- (i) a Saline Flow Conductivity (SFC) of at least 40×10−7 cm3s/g;
- (ii) an AUL 0.7 psi (4826.5 Pa) of at least 20 g/g;
- and
- (iii) a Frangibility Index of at least 60%.
8 more elements
Dependencies are inferred from the claim text.