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Absorbent articles having liquid swellable breathable backsheet

A technology for backsheets and articles, applied in the field of breathable backsheets, can solve the problems of not being able to use breathable backsheets, not eliminating wet through, and exacerbating the problem.

Inactive Publication Date: 2000-10-11
THE PROCTER & GAMBNE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the data given in the patent, the liquid passage is not blocked to a large extent, so that these meshes do not eliminate the wet-through problem
[0012] Therefore, since the introduction of breathable backsheets in absorbent articles results in a reduced level of protection, further product comfort improvements such as reduced product thickness and increased product flexibility (which would further exacerbate the problem) do not appear to be available in absorbent articles. breathable backsheet
Thus, there are two sides to the problem in the resulting approach, namely the need to improve the comfort of the absorbent product to the consumer on the one hand and to provide an acceptable level of protection to the absorbent product on the other hand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] "Aquafilm hot water" from Aquafilm Ltd, UK.

Embodiment 2

[0059] "Ekosol tipo C 60°C" from Ekomer Srl, Italy.

Embodiment 3

[0061] "Ekosol tipo C 80°C" from Ekomer Srl, Italy.

[0062] The above films were perforated using a steel needle punch. The piercer consists of a 530 micron x 350 micron (rectangular) steel needle with a height of 4 mm. The steel needles are arranged in a grid form so that the distance between the centers of any two adjacent rectangular bases of the needles is 5 mm.

[0063] dry and wet samples

[0064] The term "dry" as used herein refers to sample material stored at 23°C and 50% relative humidity for at least 12 hours. Tests were also carried out under such conditions.

[0065] The term wet state used here refers to the sample material that has been mixed with 10cm by using a pipette. 3 Uniform contact with 37 °C distilled water. Excess water was removed by lightly pressing the sample on blotting paper. Samples were left to stand for at least 60 seconds before testing, and testing was performed within 10 minutes of contact with water.

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Abstract

The present invention relates to absorbent articles such as sanitary napkins and panty liners which are breathable by the incorporation of a breathable backsheet therein, and have a reduced tendency to exhibit garment wet through. The breathable backsheets comprise at least one moisture vapour permeable, apertured layer selected from wovens or apertured films comprising a nonsoluble, liquid swellable material such as polyvinyl alcohol, which upon contact with the fluid discharge the material swells. This causes the apertures of the layer to close and hence prevents the passage of liquid through the backsheet onto the garment of the wearer.

Description

field of invention [0001] The present invention relates to the provision of breathable backsheets for use in absorbent articles which are activated upon contact with liquids to prevent wet out of the garments. Background of the invention [0002] What is being researched and developed in the field of absorbent articles, especially menstrual products, is a product that provides both a high degree of protection and a high degree of comfort, and is desired by most consumers. [0003] One approach to providing comfort benefits to consumers in absorbent articles is to provide breathable products. Breathability has generally focused on the incorporation of so-called "breathable backsheets" in absorbent articles. Commonly used breathable backsheets are directionally fluid transport microporous films and apertured formed films such as those disclosed in US 4,591,523. All of these types of breathable backsheets are water vapor permeable, allowing gas exch...

Claims

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Application Information

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IPC IPC(8): A61F13/514A61F13/15
CPCA61F13/51403A61F13/5146
Inventor 费比奥·查梅彻拉迈克尔·迪沃伊塔洛·科扎尼
Owner THE PROCTER & GAMBNE CO