JPS59105448A - Absorbale article - 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 an absorbent article, and particularly to an absorbent article that can absorb and deodorize menstrual blood odor, urine odor, fecal odor, etc.

Absorbent articles generally consist of an absorbent material, a liquid-permeable sheet provided on the use side of the absorbent, and a leak-proof material sheet that prevents leakage of the absorbent material, and also prevents odors such as menstrual blood and urine. Contains deodorizing agents.

Traditionally, activated carbon, activated carbon fiber, chlorophyll,
Ion exchange resins are used.

Among these, it is common to mix activated carbon (including activated carbon fibers) with chemical pulp and make paper in a mixed state, but in this method, the soluble substances eluted from the valve during paper making are adsorbed to the activated carbon. There was a drawback that the deodorizing power was impaired.

It is also known to simply sprinkle activated carbon between two sheets of paper without mixing it with paper, and sandwich it by pressing it with an embossing roller. However, when this is used in absorbent products such as sanitary napkins and diapers, the activated carbon may fall off during transportation, worsening the desired deodorizing ability, or float to the surface of the product, impairing its value as a product. There was a problem.

On the other hand, activated carbon is effective against slightly acidic odor components such as hydrogen sulfide and mercaptans, but is not so effective against basic odor components such as ammonia and amines.

Incidentally, menstrual blood is almost odorless immediately after excretion, but it is decomposed by microorganisms and oxygen, and over time it becomes ammonia, methylamine, ethylamine, isobutylamine, other amines, hydrogen sulfide, methyl mercaptan, and ethyl mer. Generates Kapumen etc. In the case of urine, the main odor component is ammonia, and feces contains hydrogen sulfide, amines, mercapkuns, and small amounts of indoles.

Therefore, sanitary napkins, diapers, etc. must be effective against both basic and acidic odor components.

As a result of searching for substances that have adsorption and deodorizing effects on basic odor components, we discovered that polymer absorbers with carboxyl groups, such as acrylic acid polymer sodium salt, are effective, and we have proposed a utility model for those that utilize this. I applied for registration (Utility Application No. 55-166225), but this product is a mixture of activated carbon, a polymer absorber, and powdered pulp, and is simply made into a sheet by compression molding. This included problems such as falling off and surfacing.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and provides an absorbent article that can effectively deodorize both basic and acidic odors and that does not have to worry about the deodorizer falling off. With the goal.

That is, the absorbent article of the present invention is characterized by having a deodorizing sheet in which activated carbon and a polymeric absorbent material are sandwiched between two sheets of tissue paper and welded together using a heat-melting polymer. do.

The present invention will be explained in more detail below.

As the polymer absorber, any material that can adsorb basic odor components can be used; specific examples include acrylic acid polymer sodium salt, starch-acrylic graft copolymer, and acrylic acid polymer. Ester polymer, starch
Acrylamide-sodium acrylate copolymer, cross-linked sodium calxymethyl cellulose, sodium calxymethyl cellulose? , C to cf) A polymer having a carboxyl group can be exemplified.

As the heat-soluble polymer, one having a melting point of about 110 to 160 DEG C. is suitable, and powder-like polymers are more preferable than fibrous ones because they are easier to mix with pulp fibers. A specific example is polyethylene powder (Flocene, manufactured by Mitsui Petroleum Chemicals, Ltd.).

FIG. 1 is a schematic cross-sectional view showing an example of the structure of a deodorizing sheet used in the present invention, in which activated carbon 13 and a polymer absorber 15 are welded between thin paper sheets 11 with a thermofusible polymer 17. The ht of activated carbon is 1 to 30. ! 9/ze is preferably 5 to 20 g/, and the polymer absorber is about 5□ to 40 g7171, preferably 10 to 30
g/m2 is appropriate. Reference numeral 19 represents powder pulp, and this is used as a material that imparts bulkiness to the deodorizing sheet and improves absorption by the polymer absorber, but the purpose of the present invention can be achieved even if it is not used. sell.

To create this deodorizing sheet, activated carbon and an absorbent polymer are combined with a heat-melting polymer, and if necessary, cellulose 1,
It may be mixed with fibers, spread uniformly between sheets of paper, and then heated to a temperature higher than the melting point of the thermofusible polymer to weld and integrate. This can be done, for example, by heating the thermofusible polymer to a temperature higher than its melting point, and applying pressure and pressure using an enzyme roller or the like to integrate the materials.

The amount of heat-melting polymer should be at least %, preferably 1/4 or more, of the total amount of activated carbon and polymer absorber, although it varies somewhat depending on the volume of the activated carbon and polymer absorber and the amount of cellulose fiber blended. For example, it is possible to sufficiently prevent the pieces from falling off.

Next, a formulation example of a deodorizing sheet will be shown.

Formulation Example 1 Activated carbon 10 parts by weight Sodium acrylic acid polymer 20 parts by weight Pulp powder 10 parts by weight 1 part by weight Fibrous polyethylene 10 parts by weight Activated carbon 4 parts by weight Sodium acrylate polymer 10 parts by weight Powdered polyethylene 5 parts by weight Blending example 3 Activated carbon 15 parts by weight Starch
Acrylic acid copolymer 20 parts by weight Rayon staple 5 parts by weight Powdered polyethylene 15 parts by weight Powdered pulp 10 parts by weight FIG. 2 is a schematic cross-sectional view showing an example of the structure of a sanitary napkin including a deodorizing sheet. 7 shows a case where a deodorizing sheet 23 is disposed in an absorbent body 22 composed of a powdered pulp 19 and an absorbent paper 21. Of course, the deodorizing sheet can be placed closer to the upper surface, and can also be used on the front or back side of the absorbent body.

Furthermore, any structure or material for the absorbent body can be used as appropriate. In the figure, 25 represents a leak-proof material, 27 represents a liquid permeable sheet, and 29 represents a slip prevention agent.

As is clear from the above explanation (as well as from the examples below), the absorbent article of the present invention can deodorize both acidic odor components and tumor-causing odor components. The deodorizer will not fall off even if external force is applied to the product.

Example 1 First, as a comparative example, Table 1 shows the results of a deodorizing power test of an activated carbon sheet sandwiched with 80 to 200 meshes of activated carbon sprinkled on thin paper at a ratio of 4 to 289/7i.

In addition, as an example of a polymer absorber, acrylic acid polymer sodium salt (AANa) i is 5 to 30! Table 1 also shows the deodorizing power of a sheet sandwiched with starch-acrylic copolymer (5-AANa) and a sheet sandwiched with q/m2 uniformly sprinkled on paper.

Furthermore, both activated carbon and AANa were added to 89/n? The deodorizing properties of the present invention are mixed with powdered polyethylene and sprinkled uniformly between thin paper sheets with a basis weight of 15β/m', heated to approximately 150°C (to a material temperature of 135°C), and embossed and pressed. The deodorizing power of the sheets was evaluated and summarized in Table 1.

Deodorizing power measurement method Each sample piece was left in a thermostatic chamber at 30°C - 85% RH for 1 hour to adjust the humidity, then placed in a sealed glass bottle with variable volume, and a fixed amount of each odor component diluted solution was added using a micro cylinder. After 2 hours, while stirring every 20 minutes, the residual amount of odor components (ippm) in the variable volume sealed glass bottle was measured using a gas detection tube.
) was sought.

On the other hand, using only two sheets of thin paper as a blank, the amount of odor components (bppm) and the deodorization rate χ (%) were similarly determined using the following formula. Note that a and b are average values measured three times.

χ=a/b (%) As is clear from Table 1 below, activated carbon has strong deodorizing power against hydrogen sulfide and mercaptans, but is less effective against ammonia and amines. On the other hand, polymer absorbers have a high deodorizing rate for ammonia and amines. According to the product of the present invention, both are deodorized.

In the case of a mixture of activated carbon and polymer absorber, the former is 29/
rrj or more, the latter is 5g/rr1 or more, more preferably the former is 4g/rr1 or more, and the latter is 10g/7FL!
If you mix the above, the deodorizing power will be close to complete.

Example 2 A deodorizing sheet of the present invention was obtained in the same manner as in Example 1, except that the amounts of activated carbon, acrylic acid polymer sodium salt, and powdered polyethylene were changed as shown in Table 2.

Next, sanitary napkins were made using this deodorizing sheet. At this time, a nonwoven fabric is used as the liquid permeable sheet.
In addition, polyethylene laminate paper was used as the leakage preventive material.

wm transport test (60 mx amplitude, 500 rpm) on this napkin and a comparison napkin simply sandwiched without powdered polyethylene.

2'0.000 times) and the results are shown in Table 2.

Table 2 ○: No falling off of activated carbon Δ: Slight drop of activated carbon ×; Activated carbon falls off. ××; A lot of activated carbon falls off

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of the structure of the deodorizing sheet of the present invention. FIG. 2 is a schematic cross-sectional view showing an example of the structure of the absorbent article of the present invention. 11... Apricot leaf paper 13... Activated carbon 15... Polymer absorber 17... Heat-melting polymer 19... Pulp powder 22... Absorber 23... Deodorizing sheet 25... Leak proof material 27 Liquid permeable sheet Atsushi Figure 1 Shoulder Figure 2

Claims (1)

[Claims] 1. An absorbent article characterized by having a deodorizing sheet in which activated carbon and a polymeric absorbent material are sandwiched between two sheets of thin paper or nonwoven fabric and bonded together by a hot-melt polymer.