Absorbent structures containing specific particle size...

A - Human Necessities – 61 – L

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A61L 15/24 (2006.01) A61F 13/15 (2006.01) A61L 15/18 (2006.01) A61L 15/42 (2006.01) A61L 15/60 (2006.01) A61F 13/56 (2006.01)

Patent

CA 2107592

Absorbent structures are disclosed which contain superabsorbent materials or a particulate material composition. The particulate material composition comprises specific, relatively narrow, particle size distributions of a superabsorbent hydrogel-forming material particles formed by solution polymerization methods and mixed with inorganic powders. The particles of superabsorbent material are of such size that at least about 70% of said particles, by weight, will pass through a U.S. Standard 50 mesh sieve with 297 micron openings and be retained on a U.S. Standard 170 mesh sieve with 88 micron openings when said particles are tested according to the Sieving Test described herein. The inorganic powder, such as amorphous silica, is intermixed with the particles of superabsorbent material in amount of between about 0.1 to about 5 parts per 100 parts of the particles of superabsorbent material. The absorbent structures of the present invention are useful in disposable absorbent articles such as diapers. adult incontinence, and the like.

Structures absorbantes renfermant des matières superabsorbantes ou une composition de matière particulaire. La composition de matière particulaire a des distributions granulométriques, spécifiques, relativement étroites de matières particulaires formant un hydrogel superabsorbant; celles-ci sont formées elles-mêmes par des méthodes de polymérisaiton en solution et mélange avec des poudres minérales. La taille des particules de matière superabsorbante fait en sorte qu'au moins 70 % en poids environ de ces particules passent à travers un crible de 50 mailles de 297 microns d'ouverture, conforme aux normes U.S., et qu'elles sont retenues sur un crible de 170 mailles de 88 microns, lorsque ces particules sont analysées selon l'essai de criblage décrit dans le présent brevet. De la poudre minérale, comme la silice amorphe, est mélangée avec les particules de matière superabsorbante, à raison d'environ 0,1 à 5 parties par 100 parties de particles de matière superabosorbante. Les structures absorbantes de la présente invention sont utiles dans des articles absorbants jetables, comme les couches, les dispositifs pour adultes incontinents, etc.

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