Water-decomposable absorbent article
AssigneeUni-Charm Corporation
InventorJyoji Shimizu
Life of this patent
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Abstract
Provided is an absorbent article which includes a backsheet, a liquid-pervious topsheet and an absorbent core sandwiched between the backsheet and the topsheet. At least the backsheet is made from a water-decomposable material. The backsheet is formed of a fibrous sheet that contains water-dispersible fibers and water-insoluble carboxymethyl cellulose. The water-insoluble carboxymethyl cellulose has a degree of etherification (D.S.) falling between 0.3 and 0.6, and is modified so that the hydrogens of at least 95% of carboxylic acids therein are substituted with metal.
Claims6
A water-decomposable absorbent article, comprising:
- a water-decomposable backsheet having two ends,
- a water-decomposable liquid-pervious topsheet having two ends different from the two ends of said backsheet,
- a water-decomposable absorbent core sandwiched between the backsheet and the topsheet, and
- a water-swellable adhesive layer provided on a garment facing surface of the backsheet for securing the absorbent article to a garment, the adhesive layer being formed in a predetermined pattern to occupy 10 to 50% of the garment facing surface of the backsheet,
- the backsheet being formed of a spunlaced nonwoven fabric having a basic weight within the range from 10 to 50 g/m2, the nonwoven fabric comprising water-dispersible fibers having a length of at most 20 mm and water-insoluble carboxymethyl cellulose having a degree of etherification within the range from 0.43 to 0.6 and being modified so that hydrogens of at least 95% of carboxylic acids therein are substituted with metal, a content of the water-insoluble carboxymethyl cellulose being from 1 to 30% by weight of the nonwoven fabric, the nonwoven fabric having a surface strength of at least 4 in terms of wax number, a breaking strength of at least 9.8 N/25 mm relative to a tensile load applied thereto in a horizontal direction of the sheet, a breaking strength of at least 1.5 N/18 mm in a vertical direction, and a water-decomposability of at most 120 seconds.
A water-decomposable absorbent sanitary napkin, comprising:
- a water-decomposable backsheet having two ends,
- a water-decomposable liquid-pervious topsheet having two ends different from the two ends of said backsheet,
- a water-decomposable absorbent core sandwiched between the backsheet and the topsheet, and
- a water-swellable adhesive layer provided on a garment facing surface of the backsheet for securing the sanitary napkin to a garment, the adhesive layer being formed in a predetermined pattern to occupy 10 to 50% of the garment facing surface of the backsheet,
- the backsheet being formed of a spunlaced nonwoven fabric having a basic weight within the range from 10 to 50 g/m2, the nonwoven fabric comprising water-dispersible fibers having a length of at most 20 mm and water-insoluble carboxyethyl cellulose having a degree of etherification within the range from 0.43 to 0.6 and being modified so that hydrogens of at least 95% of carboxylic acids therein are substituted with metal, a content of the water-insoluble carboxyethyl cellulose being from 1 to 30% by weight of the nonwoven fabric, the nonwoven fabric having a surface strength of at least 4 in terms of wax number, a breaking strength of at least 9.8 N/25 mm relative to a tensile load applied thereto in a horizontal direction of the sheet, a breaking strength of at least 1.5 N/18 mm in a vertical direction, and a water-decomposability of at most 120 seconds.
Dependencies are inferred from the claim text.