JPS59199801A - Urinaton discriminable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaper having a region whose color changes depending on water absorption. More specifically, the present invention provides an area in which the substance whose hue changes upon absorption of water is a colored chemical dye, and where the mother or the like can determine that the infant has urinated based on the change in hue. Regarding diapers having

Diapers for infants, etc. are often disposable diapers made of water-absorbent nonwoven fabric or pulverized pulp covered with a waterproof film, but it is desirable to change the diapers immediately after urinating. In response to such a request, the present invention applies a transparent label coated with a chemical dye to an absorbent nonwoven fabric or a waterproof film in a position that is easily visible from the outside inside the diaper.
Alternatively, there is provided a diaper by which urination can be determined, which is made by coating, impregnating, or printing an absorbent nonwoven fabric with a chemical dye, or by coating or printing a chemical dye on the inner surface of a waterproof film.

The term "chemical dye" as used in the present invention refers to a substance that is a colored metal compound, is water-soluble, and changes its hue through an ionization reaction, and it does not matter whether it is an inorganic compound or an organic compound. Examples of ways in which the hue changes include changing to a different hue, disappearing, and changing to a different hue but to the naked eye it seems that the hue has almost disappeared, but in practical terms, disappearance Or something that is close to disappearing is preferable because it is easy to identify urination. Metal compounds are generally selected from divalent or higher metal salts and other metal compounds, but salts of metals such as cobalt, iron, and nickel are particularly bright in color and have a noticeable change in hue. Therefore, it is suitable.

As a representative example of a metal compound that satisfies the above requirements, a method for producing cobalt thiocyanate and a change in hue due to an ionization reaction will be described below.

cobal sulfate) 2.5) C! Dissolve J in 256 water,
Calcium thiocyanate 4.5-5.0 kl? The anhydrous salt of the chemical dye cobalt thiocyanate is prepared by adding and stirring well, and after the reaction is completed, the solution is filtered to remove calcium sulfate, and the lachrymal fluid is evaporated to dryness.

CoSO4+Ca(SCN)2= Co(SCN')2
+CaSO4 This anhydrous salt is yellowish brown in color, but when left at room temperature it easily turns into a blue tetrahydrate. The tetrahydrate dissociates in water as shown in the following formula, and the blue color disappears.

Co(SCN), →co■+2sci <- Note that this dissociation occurs similarly in urination and physiological saline.

Above, I explained about cobalt thiocyanate, but the ferric salt of thiocyanate (dark red) and the nickel salt (yellow green)
The same is true for the same, and the hue disappears due to water absorption. Furthermore, other metal salts of acids such as sulfurized cobalt heptahydrate (reddish brown), cobalt chloride hexahydrate (red), nickel sulfate hexahydrate (green λ, ferric chloride (yellow brown), etc. Most of the hue disappears due to dissociation in water.

The present invention applies such a hue change phenomenon to diapers, particularly disposable diapers, to enable urination to be determined. It is characterized by the fact that a region is provided, the metal compound in the region is a water-soluble chemical pigment that changes hue through an ionization reaction, and the change in hue of the region due to water absorption can be discerned from the outside. .

Next, the present invention will be specifically described according to preferred embodiments shown in the accompanying drawings.

In the figures, Fig. 1 is a partial cross-sectional view of a conventional disposable diaper, Figs. 2 to 5 show various embodiments in which the present invention is applied to the diaper shown in Fig. 1, and Fig. 2 shows chemical pigments in a transparent film base material. Fig. 3 is a partial cross-sectional view of an embodiment in which a label coated with a transparent film is attached to the back side of a nonwoven fabric, and Fig. 3 is an embodiment in which a label made by coating or printing a chemical dye on a transparent film base material is attached to the inner surface of a waterproof film. 4 is a partial sectional view of an embodiment in which the back nonwoven fabric is impregnated with a chemical dye, and FIG. 5 is a partial sectional view of an embodiment in which the inner surface of the waterproof film is coated or printed with a chemical dye.

In Figures 1 to 5, (a) is a layer containing a chemical dye together with a binder, (b) is a label base material, and (c) is a front nonwoven fabric (only one sheet is shown in the figure, but there may be multiple sheets). ), 2) is an absorbent pad, (E) is a non-woven fabric on the back side,
(f) indicates a waterproof film.

For example, the area containing the chemical dye is a label made by applying a chemical dye on a transparent film base material with a binder, as shown in Figures 2 and 3. or by pasting it on the inner surface of the
By impregnating the inside of the back nonwoven fabric (E) with the chemical dye (A) together with a binder (Fig. 4), or by fixing (painting, by printing)
can be formed. Although not shown in the drawings, a chemical dye layer can also be applied to the back surface of the back nonwoven fabric (e) by coating or printing.

Chemical pigments come in a variety of individual colors, so if these individual colors are combined to print floral patterns, trademarks, etc., it will not only have a practical function as a urination indicator, but also have a decorative effect due to the change in hue. Or you can also obtain a trademark effect.

The binder that binds the chemical dye to the film base material (b), the back nonwoven fabric (e), or the waterproof film (b) is as follows:
Among natural and synthetic binders that do not coagulate with chemical dyes when preparing a coating solution and can adsorb the chemical dyes well, those with weak film-forming properties and good transparency of the formed film. is selected. For example, SBR
Latex, MBR latex, acrylic latex,
Enzyme-modified starches etc. give good results.

The content of the chemical dye in the coating layer varies depending on the type of chemical dye, but as an anhydrous layer, it needs to be at least 0.1.7 mm thick, and if it is less than this, it will be difficult to distinguish the state of hue change from the outside. Become. According to a test example applied to a transparent film or waterproof film as a label base material, in the case of a combination of cobalt thiocyanate and enzyme-modified starch, 0.31
~o, rt/m”, cobalt thiocyanate and Polysol M-19 (trademark, acrylic latex, manufactured by Showa Kobunshi)
0.16 to 0, ay/m” in combination with
was suitable. However, when impregnating non-woven fabrics, the amount of permeation of the coating liquid is large, so the content of chemical dyes can be changed considerably. can get.

In addition, the compounding ratio of the chemical dye and binder can be determined individually by taking into account the stability of the coating liquid, the ability of the binder to absorb/adsorb the chemical dye, the adhesion to the substrate, etc. It is natural that nonwoven fabrics require less binder in terms of permeability.

Next, the present invention will be specifically explained using examples. All parts, percentages, and ratios in each example are based on weight.

Example 1 2 parts of cobalt thiocyanate, Polysol M-19 as described above
(Concentration 45%) 100 parts and water 50 parts were polymerized to give a concentration of 3.
A 1% coating solution was prepared. In this case, the blending ratio of cobalt thiocyanate and nokuinder is 1:22 as solid content.
．． It was 5. This coating solution was coated on one side of a polyester sheet having a thickness of 20 microns which had been subjected to a corona discharge treatment using caulk, and dried to prepare a blue coated sheet.

The total application amount is 5. The content of cobalt thionoanoate was 21 t/m.

Cut this into 5cIrL x 5crrL and use it as a label.
The coated surface (the back surface of the polyester sheet) was adhered to the center of the back surface of the back nonwoven fabric of the diaper (FIG. 2).

The blue color could be clearly observed from outside the translucent waterproof film.

Next, assuming that the amount of urine an infant urinates at one time is approximately 50 liters, the same amount of physiological saline was applied to the center of the diaper, and after approximately 3 seconds, the blue color disappeared and the diaper became colorless and transparent. The changes were clearly visible through the waterproof film.

Example 2 5 parts of cobalt thiocyanate, 25 parts of enzyme-modified starch,
Concentration 9.0% consisting of a small amount of surfactant and 300 parts of water
A coating solution was prepared. The blending ratio of cobalt thiocyanate and binder was 1:5. This was applied to one side (corona discharge treated side) of a polyethylene waterproof film for disposable diapers in the same manner as above and dried. The total coating amount was 4 y/m'', of which the content of cobalt thiocyanate was 0.7 - 7 m''. A diaper was made by combining these as shown in Figure 5, and when a physiological saline solution was given to the company in the same manner as above, the blue color in the corresponding area disappeared when it warmed up, and it was clearly identified through the milky white waterproof film. did it.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a conventional disposable diaper.
2 to 5 are partial sectional views showing examples in which the present invention is applied in various aspects to the paper diaper shown in FIG. 1. In the figure, A is a layer containing a chemical dye together with a binder;
The opening represents the base material of the label, C represents the front non-woven fabric, 2 represents the absorbent pad, E represents the back non-woven fabric, and H represents the waterproof film.

Claims (1)

[Claims] It is made by providing a region in which a colored metal compound exists in a predetermined region inside the diaper, and the metal compound is a water-soluble chemical pigment that changes its hue by an ionization reaction, and the region is formed by absorbing water. A diaper capable of determining urination, characterized in that a change in hue is distinguishable from the outside.