Absorbing article

Abstract

A wetness indicator composition contains (a) 0.1 % to 5% by weight of a pH indicator that is substantially colorless at pH 7 and develops a color in an acidic environment, (b) 20% to 90% by weight of a surfactant, (c) 5% to 55% by weight of a polyalkylene glycol, (d) 0% to 70% by weight of a polymer having a carboxyl group, and (e) 0.1% to 5% by weight of an acidic substance other than components (b) and (d). In an absorbent article including a topsheet 2, a backsheet 3, and an absorbent member 4 interposed between the topsheet 2 and the backsheet 3 and having applied thereon a hot-melt composition that changes color on contact with a body fluid, the wetness indicator composition is used as the hot melt composition.

Description

technical field [0001] The present invention relates to absorbent articles using wetness indicator compositions. The humidity indicator composition of the present invention has thermoplasticity and flexibility, an initial color tone is colorless, and can develop color responsively when wetted with water, and has a function of notifying wetness with water. Utilizing these characteristics, it can be effectively used for various purposes. Background technique [0002] In recent years, a humidity indicator has been used as a structure for notifying that a device is wetted with water. As one of such applications, the following technology is known: combining with a disposable non-woven absorbent product, it can be known that the baby has peed without directly looking at it, thereby notifying the replacement time of the absorbent product (Patent Documents 1 and 2) . [0003] Patent Document 1: Japanese National Publication No. 2004-512425 [0004] Patent Document 2: Japanese Pa...

AI Technical Summary

Problems solved by technology

[0005] In the technique disclosed in Patent Document 1, the initially colored wetness indicator is discolored, and when the diaper surface has a pattern, there is a disadvantage of hiding or staining the pattern.

[0006] In the technology disclosed in Patent Document 2, since the colorless wetness indicator develops color by contact with body fluids, disadvantageous situations such as concealment or staining of the surface pattern of the diaper are less likely to occur. There is still room for improvement in the rapidity (responsiveness) of color development when the agent is wetted by water

[0007] In addition, with regard to conventional disposable non-woven absorbent products using a humidity indicator, there are reports of natural color development due to humidity even if it is not wet with urine, and there are examples reported that it is not durable

Furthermore, as an application, there are also reports that the viscosity at the time of coating is very low, making it difficult to coat

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