JP2001029387A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorptive article which includes a urethane foam, is thin and compact when formed as a package, restores the thickness and offers a high sense of security at the time of use and of which the urethane foam is hardly yellowed by UV rays and gaseous Nox. SOLUTION: This absorptive article includes a liquid permeable front surface sheet 2, a liquid impermeable front surface sheet 3 and a liquid holdable absorbent 4 interposed between both sheets. In such a case, the absorptive article includes a urethane foam of 5 to 35 kg/m3 in density, 1 to 10 mm in no-load thickness and >=60% in compression recovery rate between the rear surface sheet 3 and the absorbent 4, etc. This urethane foam is <=40 in YI value when the urethane foam is rested for 5 hours in 200 ppm gaseous nitrogen monoxide and when irradiated with UV rays for 24 hours by a carbon arc type fade-o- meter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article which is light in weight, has an appropriate thickness, and has a high sense of security during use. The present invention relates to an absorbent article, such as a disposable diaper, which recovers its thickness when used after being taken out of the apparatus, has a high sense of security at the time of use, and does not lose its appearance due to ultraviolet rays or nitrogen oxide gas.

[0002]

2. Description of the Related Art In recent years, absorbent articles such as diapers and sanitary napkins have become compact and easy to carry due to improvements in their constitution and materials used. . However, when the package is made compact, the thickness of one absorbent article becomes thin, the absorbent article becomes flat, and anxiety about leakage occurs during use. Therefore, the package is compact and light, but when taken out of the package and used, the thickness recovers,
There is a demand for an absorbent article that can provide a sense of security during use.

[0003] Japanese Patent Application Laid-Open No. 51-66194 discloses a structure in which an absorbent core and a backing sheet are provided.
A napkin having an elastic, moisture-stable foam layer capable of holding and holding an absorbent core in a perineum of a wearer is disclosed. Examples of the foam layer used here include polyurethane foam, vinyl foam, polyvinyl chloride foam, and the like. Also, JP-A-3-197
No. 128 discloses a superabsorbent composite structure having a three-layer structure, in which a second layer is formed of a foam containing a superabsorbent fine particle material. As the foam containing the superabsorbent fine particle material used here, urethane foam is used. Polyurethane foam and urethane foam described in these publications,
None of them use compression recovery properties, and they are not used to give a sense of security during use.

[0004] Urethane foam is compact when used as a package by being used in absorbent articles by utilizing its softness and compression recovery, but when used out of a packaging bag, its thickness recovers. Then, an absorbent article such as a disposable diaper having a high sense of security during use can be obtained.
However, it is known that urethane foam is yellowed or browned by ultraviolet rays, nitrogen oxide (NO _x ) gas and the like. For this reason, when making an absorbent article such as a disposable diaper using urethane foam between the back sheet and the absorber, between the top sheet and the absorber, or inside the absorber, or at a plurality of locations thereof, expose it to sunlight for a long time. Exposure to nitrogen oxide gas emitted from the fan heater by putting it near the fan heater in winter,
When only the urethane foam turns yellow, the appearance of the absorbent article is impaired. Particularly lightweight diapers are made of materials adjacent to urethane foam, such as surface materials,
The back material becomes thin, and the yellowing of the urethane foam becomes easy to see. Further, even if urethane foam is put inside the absorber, the light-weight diaper has less pulp layer, and yellowing is easily seen from the surface material side and the back surface material side, and improvement is desired.

[0005] In order to prevent such yellowing of urethane foam, conventionally, various ultraviolet absorbers, antioxidants, a method of adding a stabilizer such as a piperidine compound,
A method of adding or applying a white pigment such as titanium white has been attempted. However, in these conventional methods, the effect of preventing urethane foam from yellowing was insufficient.

[0006] Accordingly, an object of the present invention is to provide an absorbent article provided with urethane foam, which is thin and compact when it is made into a package, but when it is taken out of a package and used. It is an object of the present invention to provide an absorbent article whose thickness has been recovered and has a high sense of security during use, and the urethane foam is hardly discolored by ultraviolet rays or nitrogen oxide gas.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retentive absorber interposed between the two sheets. , Urethane foam is provided between the back sheet and the absorber, between the top sheet and the absorber, or inside the absorber or at a plurality of locations thereof, wherein the urethane foam is in 200 ppm nitric oxide gas. The above object has been achieved by providing an absorbent article having a YI value (yellow index) of 40 or less when left unattended for 5 hours and when irradiated with ultraviolet rays by a carbon arc type fade meter for 24 hours.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments. As shown in FIGS. 1 to 4, the disposable diaper 1 as an absorbent article of the present embodiment is interposed between a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and both sheets 2, 3. A fastening tape 11 is provided on the left and right side edges B1 and B2 of the back side portion B.

[0009] Specifically, the disposable diaper 1 of the present embodiment.
As shown in FIGS. 1 to 4, the device includes an absorber 4, a back sheet 3 having substantially the same size as the absorber 4, and a top sheet 2 arranged to cover the surface and side surfaces of the absorber 4. . The outer layer nonwoven fabric 5 is arranged on the front side of the back sheet 3, and the water repellent nonwoven fabric 61 for forming the three-dimensional gathers 6 is arranged on the top sheet 2 on the side edge side of the absorber 4. The outer nonwoven fabric 5 and the water-repellent nonwoven fabric 61 are both extended to the left and right side edges of the absorber 4, and hold and fix the leg elastic members 71 to form a pair of left and right leg gathers 7. At the free edge portion 62 of the water-repellent nonwoven fabric 61, a three-dimensional gather elastic member 63 for forming the three-dimensional gather 6 is arranged. At both longitudinal ends of the disposable diaper 1, the outer nonwoven fabric 5 and the topsheet 2 extend from both longitudinal ends of the absorber 4 to form a pair of waist portions 8. The waist portion 8 has a sheet-like waist elastic member 8.
1 are arranged and fixed by the topsheet 2 and the outer layer nonwoven fabric 5. Absorber 4 is made of absorbent polymer 42
Is held in the fiber gap, and a mount 43 for packaging the bulky nonwoven fabric. A fastening portion 51 for fastening the fastening tape 11 is provided on the surface of the outer nonwoven fabric 5 in the abdominal portion A.

Therefore, the disposable diaper of the present embodiment is
A specific urethane foam is provided at a predetermined position.

The urethane foam can be arranged between the back sheet and the absorber, between the top sheet and the absorber, or at a position inside the absorber, and at a plurality of positions. You can also. Since the urethane foam is arranged in this manner, the disposable diaper of the present embodiment is thin and light in the package,
Thickness recovers when taken out of the packaging bag and used. still,
In the present embodiment, the urethane foam 44 is formed as shown in FIG.
As shown in Nos. 1 to 4, it is arranged between the back sheet 3 and the absorber 4.

The method of arranging the urethane foam at the position is not particularly limited. For example, a method of bonding and fixing the urethane foam at the position with a hot-melt adhesive, or a method of arranging the urethane foam inside the absorbent body, There is a method of wrapping and fixing.

The urethane foam used in the disposable diaper of the present embodiment has a YI value (yellow index; yellow index) when left in 200 ppm of nitric oxide gas for 5 hours and when irradiated with ultraviolet rays by a carbon arc type fade meter for 24 hours. (Degree of change) is 40 or less, preferably 35 or less, and more preferably 30 or less. Since the YI value is 40 or less, the urethane foam can be used to remove nitrogen oxides (NO
And NO _2, etc. NO _x) are those yellowing hardly irradiated with ultraviolet light, such as environmental exposure to and sunlight for long periods in the gas, the appearance of the absorbent article, in which yellowing is not recognized. When the YI value exceeds 40, the urethane foam is found to be yellowed from the outside of the top sheet or the back sheet of the absorbent article, and impairs the appearance of the absorbent article. The YI value is measured according to JIS K7103-1977.

The urethane foam has an ultraviolet absorber, a general formula (I) of the following [Chemical Formula 3] (the same as the above [Chemical Formula 1]), and a phosphorus content of 4.0 to 14.0% by weight. %
And a 1,1-dialkyl-substituted semicarbazide having a group represented by the following general formula (II), (III) or (IV): Or those containing a stabilizer comprising carbazic acid ester are preferred. By using the urethane foam containing such a stabilizer, the yellowing thereof can be remarkably improved, and the YI value can be easily reduced to 40 or less. This effect is attributable to the synergistic effect of the combination of the ultraviolet absorber constituting the stabilizer, the tertiary phosphite, and the 1,1-dialkyl-substituted semicarbazide or carbazate.

[0015]

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[0016]

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As an example of the ultraviolet absorber, Japanese Patent Publication No.
Compounds described in column 4, lines 8 to 24 of JP-A-79105. Among them, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2
-(2'-Hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole and 2- (2'-hydroxy-3', 5'-dialkylphenyl) benzotriazole are particularly preferred. These ultraviolet absorbers are used alone or as a mixture of two or more thereof together with the tertiary phosphite and the 1,1-dialkyl-substituted semicarbazide or carbazate.

The tertiary phosphite is represented by the general formula (I) and has a phosphorus content of 4.0 to 14.0% by weight.
Is in the range of Most preferred as such a tertiary phosphite are those having a phosphorus content of 6.0 to 8.0.
% By weight, and specific examples include triisodecyl phosphite, phenyldiisodecyl phosphite, diphenylnonylphenyl phosphite, and triisooctyl phosphite. These tertiary phosphites may be used alone or as a mixture of two or more.
The UV absorber and the 1,1-dialkyl-substituted semicarbazide or carbazate are used in combination.

The 1,1-dialkyl-substituted semicarbazide or carbazate is represented by the general formula (I)
It has a group of I), (III) or (IV). For example, JP-B 5-79105, column 5, line 24 to column 7
Each compound described in column 22, line is mentioned. Among them, 1,6-hexamethylenebis (N, N-dimethylsemicarbazide) [compound (A)], 1,1,5,5-
Tetramethylcarbohydrazide [compound (G)], phenyl N-morpholinocarbazate [compound (Y)], 1,
1-phenyl dimethylcarbazate [compound (Z)],
1,6-Hexamethylenebis (N-morpholinocarbazide) [compound (J)] and 1,6-hexamethylenebis (N, N-cyclopentylenesemicarbazide) [compound (I)] are particularly preferred. These 1,1-dialkyl-substituted semicarbazides or carbazates are
The UV absorber and the tertiary phosphite are used alone or as a mixture of two or more.

The phosphorus content of the tertiary phosphite is determined from column 7, line 27 to column 8 of JP-B-5-79105.
It is determined by the method described in column 13 line.

The content of the stabilizer is determined by the ultraviolet absorber, the tertiary phosphite, and the 1,1-dialkyl substitution in view of the stabilizing effect and the improvement of physical properties such as strength and elongation of the product. Both semicarbazide and carbazate are preferably 0.05 to 5% by weight, more preferably 0.1 to 3% by weight of the polyurethane forming the urethane foam.

With respect to the method of incorporating the stabilizer into the urethane foam, the stabilizer may be added beforehand by dispersing it in a part of a raw material for producing a urethane foam.
The raw material for urethane foam production may be heated and dissolved before use.

In the production of the urethane foam, a polyisocyanate and an active hydrogen-containing compound are used. As the polyisocyanate, a polyisocyanate such as toluene diisocyanate and 4,4′-diphenylmethane diisocyanate, a mixture thereof, a modified product thereof, or a prepolymer thereof is used. As the active hydrogen-containing compound, a polyol compound is used, and a polyester polyol or polyether polyol having an average molecular weight of 500 to 8,000 having two or more hydroxyl groups per molecule or a mixture thereof is preferable.

The urethane foam is prepared, for example, by mixing the ultraviolet absorber, the polyol component containing the 1,1-dialkyl-substituted semicarbazide or carbazate, and the isocyanate component containing the tertiary phosphite. It is manufactured by natural foaming after stirring to form a foam.

The urethane foam may contain, as other compounds, various additives such as a chain extender, a catalyst, a foaming agent, a coloring agent, an inorganic filler, a foam stabilizer, an antioxidant, and a light stabilizer. No problem.

The urethane foam preferably has a density of 5 to 35 kg / m ³ , more preferably 5 to 20 kg / m ³ .
m is ^3. The density of the urethane foam, the moldability and flexibility of the urethane foam, compactness of the package,
Further, the above range is preferable from the viewpoint of lightness of the snack. In addition,
This density, leaving the urethane foam for 24 hours, remove the strain applied to the urethane foam before the measurement,
It is obtained by measuring the thickness, length and weight of urethane foam.

The urethane foam preferably has a thickness under no load of 1 to 10 mm, more preferably 1.7.
５5 mm. The thickness of the urethane foam under no load is preferably in the above range from the viewpoint of further exhibiting the compression recovery effect and ease of use. Here, the thickness under no load of the urethane foam refers to the thickness at the time when the sheet is left under no load for 24 hours before the measurement to remove the strain applied to the sheet. The thickness was measured using a laser displacement meter (manufactured by Keyence, model “PA-1830”).
It is measured according to the usual method. The urethane foam is preferably 0.2 to 3 mm, more preferably 0.3 to 3 mm.
It can be compressed up to 1 mm.

The compression recovery of the urethane foam is preferably at least 60%, more preferably at least 70%, most preferably at least 90%. The compression recovery rate of the urethane foam is preferably in the above range from the viewpoint of the compactness of the package of the disposable diaper, the recoverability when the diaper is taken out of the packaging bag, and the sense of security. Here, the compression recovery rate is measured by the following measurement method. Compression recovery rate measurement method: The urethane foam is left for 24 hours before the measurement, and the strain applied to the urethane foam before the measurement is removed. The thickness at the time when the distortion was removed (thickness before compressing the urethane foam) was amm, 180 gf / cm
After compressing for 24 hours at a pressure of ² and then removing the pressure and leaving the plate to stand for 30 minutes to give a thickness of bmm, the compression recovery ratio =
Define as b / a and measure each thickness. Here, the thickness is
Laser displacement meter (Keyence Corporation, model "PA-183
0 ”) and is measured according to a standard method.

As the back sheet in the disposable diaper of the present embodiment, a moisture-permeable sheet is preferable in that the air permeability can be improved. The moisture permeability of the back sheet is preferably 0.5 to 4 g / (100 cm ² · h).
And more preferably 1.0 to 2.5 g / (100 c
m ² · h). When the moisture permeability is in the above range, it is possible to sufficiently prevent stuffiness inside the diaper and accompanying rash on the wearer's skin, and also prevent leakage of liquid such as urine. The moisture permeability is a value measured according to JIS Z0208.

The materials for forming the constituent members of the disposable diaper having the above-described structure will be described. As the surface sheet, the absorbent, the water-repellent nonwoven fabric and the outer layer nonwoven fabric, those usually used for disposable diapers are particularly limited. It can be used without. As the leg elastic member, the three-dimensional gather elastic member, and the waist elastic member, those usually used for disposable diapers can be used without any particular limitation. As a material for forming the fastening tape, in addition to a tape material to which an adhesive is applied, a male material tape of a mechanical fastener or the like is used. In addition, when the fastening tape is a tape material to which an adhesive is applied, a tape that has been subjected to a peeling treatment is used, and when the fastening tape is a male material tape, a tape of a normal mechanical fastener is used. A tape material used as a female material is used without any particular limitation.

The disposable diaper of the present embodiment has a non-load thickness of 1.3 times or more, especially when the load is removed, with respect to the thickness under load when a load of 180 gf / cm ² is applied to the absorbent article. It is preferable that the ratio is 1.5 to 3 times (hereinafter, this ratio is referred to as “thickness ratio”) because a more secure feeling can be obtained during use. Since the disposable diaper of the present embodiment includes the urethane foam, such a preferable thickness ratio can be easily satisfied. Here, the thickness under load and the thickness under no load are each measured according to the following thickness measurement method. First, the absorbent article is spread in a planar shape, and the longitudinal direction of the absorbent article is divided into 100 mm in the longitudinal direction and 10 mm in the width direction 10 around the intersection of the line bisecting the longitudinal direction and the line bisecting the width direction.
A test piece is obtained by cutting out at a size of 0 mm. In addition, when the dimension of the longitudinal direction or the width direction of an absorbent article is less than 100 mm, let the dimension of an absorbent article be the dimension of a test piece. The test piece is allowed to stand on a horizontal table for 24 hours under no load. Next, the weight and the acrylic plate are placed on the test piece, and left under a load for 24 hours. Here, the weight is 180 gf / c combined with the acrylic plate on the test piece.
Those having a weight and size such that a load of m ² was applied were used. The acrylic plate is 100 mm long x 100 m wide
m × 5 mm thick was used. After applying a load for 24 hours, the thickness of the four corners of the test piece was measured as it was (measurement method 1), and the average of the measured values was taken as 180 gf / cm ^2.
The thickness under the load when the load is applied. Next, the weight and the acrylic plate are removed, and the plate is left under no load for 30 minutes. After 30 minutes, if the test piece has warpage or distortion, the thickness cannot be measured accurately. Therefore, a weight and an acrylic plate are placed on the test piece so that a load of 1 gf / cm ² is applied, and the test piece is in a flat state. To keep. Here, the weight used is such that the weight and the size of the test piece are such that a load of 1 gf / cm ² is applied to the test piece together with the acrylic plate.
One having a size of 0 mm × width 100 mm × thickness 5 mm was used. Then, an acrylic plate and a weight are placed, and immediately
The thickness of the test piece is measured in the same manner as in the above, and the average of the measured values is taken as the no-load thickness.

When the disposable diaper of the present embodiment is formed into a package, it is appropriately folded, laminated, compressed and stored as usual. Then, when the disposable diaper of the present embodiment is taken out of the packaging bag and used, the diaper exhibits excellent compression recovery.

The disposable diaper according to the present embodiment is configured as described above, so that when it is made into a package, it can be made thin and compact, and when it is taken out of the packaging bag and used, its thickness recovers. Since it has an appropriate thickness, it can be used safely without giving the user etc. anxiety coming from the thinness, and the urethane foam is hardly discolored by ultraviolet rays or nitrogen oxide gas, and the diaper appearance is improved. No damage.

In the above-described embodiment, the deployment type disposable diaper has been described as an example. However, the present invention can be applied to a pants type disposable diaper, a sanitary napkin, an incontinence pad, and the like.

[0035]

EXAMPLES Production Examples of Urethane Foams (Production Examples 1 to 7 and Comparative Production Examples 1 to 9) Tertiary phosphorous acid shown in Tables 1 and 2 was added to 100 parts by weight of a polyester polyol (having a hydroxyl value of 86 and an average molecular weight of 1300). A predetermined amount of a stabilizer other than the ester was added, and the mixture was heated and stirred at 60 to 80 ° C. for 2 to 6 hours to be dissolved. To this polyol component, 5 parts by weight of water, 0.8 parts by weight of triethylenediamine, and 1 part by weight of a silicone foam stabilizer were added and mixed to obtain a polyol component. Next, 100 parts by weight of tolylene diisocyanate (TDI) were added to Tables 1 and 2
A predetermined amount of a tertiary phosphite was added and mixed to obtain an isocyanate component. Next, the polyol component 10
After thoroughly mixing and stirring 0 parts by weight and 10 parts by weight of the isocyanate component, the mixture was spontaneously foamed to obtain a foam having a density of 26 kg / m ³ . This was sliced to a thickness of 2 mm, and a urethane foam (150 mm × 1
50 mm). After performing an ultraviolet irradiation test for 24 hours with a carbon arc type fade meter using the obtained urethane foam, the yellowing degree of the test piece was measured according to JIS K710.
The yellow index (YI value) is measured by 3-1977 (test method for yellowness and yellowing degree of plastic).
The results are shown in Tables 1 and 2.

The test machine used in the experiment is as follows. (1) Carbon arc type fade meter; FAL-SH-C type manufactured by Suga Test Instruments Co., Ltd. (2) Color difference meter; SZ- # 80 manufactured by Nippon Denshoku Industries Co., Ltd.

Production Examples 1 to 7 and Comparative Production Examples 1 to 9
After the urethane foam obtained in the above was left in 200 ppm of nitric oxide gas for 5 hours, the yellowing degree was measured in the same manner as in the ultraviolet irradiation test, and the YI value was shown in Tables 1 and 2.

[0038]

[Table 1]

[0039]

[Table 2]

The structural formulas of * 1 to * 4 in Table 2 are as shown in the following [Formula 5].

[0041]

Embedded image

Example 1 and Comparative Example 1 A hot melt adhesive having the composition and melt viscosity shown in Table 3 was
A coating amount of 5 was applied to one surface of the urethane foam obtained in Production Example 1 and Comparative Production Example 1 by a spiral spray method (hot air temperature: 150 ° C., pressure: 1.8 kg / cm ² ).
The dispersion was applied substantially uniformly by pattern coating so that a dot-shaped coating portion was formed at g / m ² , and this was adhered to the mount wrapping the absorber. In addition, JIS as back sheet
The moisture permeability measured according to Z 0208 is 1.5 g / (1
A disposable diaper (paper diaper) shown in FIGS. 1 to 4 was prepared by using a moisture-permeable sheet of 00 cm ² · h) and following other methods according to the conventional method, in which urethane foam was adhered and fixed between the back sheet and the absorber.

[0043]

[Table 3]

Urethane foam used in the absorbent articles of Examples and Comparative Examples, and its density, initial thickness (thickness under no load), compression recovery rate, and thickness under load of a diaper using the urethane foam, no load Table 4 shows the thickness and the thickness ratio. The thickness under load and the thickness under no load were measured according to the thickness measurement method described in the section of the thickness ratio of the disposable diaper, respectively.

Further, the diaper was irradiated with ultraviolet rays for 24 hours from the back sheet side with a carbon arc type feed meter using a carbon arc type feed meter, and the appearance of the diaper based on the presence or absence of discoloration of the urethane foam was visually evaluated. Table 4 shows the results. The evaluation criteria are as follows. ；: The urethane foam did not yellow and there was no problem in the appearance of the diaper. Δ: Yellowing of the urethane foam can be slightly recognized from the outside of the diaper. X: Yellowing of urethane foam can be clearly recognized from the outside of the diaper.

[0046]

[Table 4]

As is apparent from the above results, when a specific urethane foam which is not easily yellowed in a nitrogen oxide gas and under ultraviolet irradiation is arranged at a predetermined position in the diaper, a package is obtained. It can be seen that, when it is made compact, it can be recovered in thickness when it is taken out of the packaging bag and used, giving a sense of security during use, and the urethane foam is not easily discolored by ultraviolet rays or the like and does not impair the appearance of the diaper.

[0048]

The absorbent article of the present invention is compact when it is made into a package, but when it is taken out of a packaging bag and used, it recovers its thickness and has a high sense of security during use. The urethane foam is hardly discolored by ultraviolet rays or nitrogen oxide gas.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a disposable diaper as an absorbent article according to the present invention.

FIG. 2 is a sectional view schematically showing a section taken along line XX of FIG. 1;

FIG. 3 is a cross-sectional view schematically showing a YY cross section of FIG. 1;

FIG. 4 is a sectional view schematically showing a ZZ section of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 11 Fastening tape 2 Top sheet 3 Back sheet 4 Absorber 41 Polymer fixed nonwoven fabric 42 Absorbent polymer 43 Mount 44 Urethane foam 5 Outer nonwoven fabric 51 Fastening part 6 Solid gather 61 Water repellent nonwoven fabric 62 Free edge 63 Solid gather elasticity Member 7 Leg gather 71 Leg elastic member 8 Waist portion 81 Waist elastic member A Abdominal side B Back side

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A61F 13/472 A61F 13/18 370 B32B 5/18 (72) Inventor Masao Kurahashi 2606 Kao Corporation Research Laboratory F-term (reference) 3B029 BA05 BA11 BD12 BD13 BD14 BD17 4C003 AA21 AA29 GA08 HA00 4C098 AA09 CC02 CC03 CC12 CE06 DD13 DD14 DD23 4F100 AH02H AH03H AH07H AK51D AR00A AR00B AR00D BA07 BA07 BA07 BA07 JD05A JD05C JD14B JL00D JL05 YY00D

Claims (4)

[Claims] 1. An absorbent article comprising: a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retentive absorber interposed between the two sheets. And between the absorber,
The urethane foam is provided between the topsheet and the absorber, inside the absorber, or at a plurality of locations thereof. The urethane foam is left in a 200 ppm nitric oxide gas for 5 hours and a carbon arc type fade meter. An absorbent article having a YI value (yellow index) of 40 or less when irradiated with ultraviolet rays for a time. 2. The urethane foam has a density of 5
A ~35kg / m ^3, no load under thickness 1~10mm
And the compression recovery rate (b / a) [where, a; the thickness at the time when the urethane foam was left for 24 hours to remove the strain applied to the urethane foam before measurement (thickness before compression) (mm) B at a pressure of 180 gf / cm ²
The thickness (mm) when the pressure is removed and left for 30 minutes after compression for 60 hours is 60% or more. 3. The urethane foam comprises an ultraviolet absorber comprising a benzotriazole derivative, a compound represented by the following general formula (I) and a phosphorus content of 4.0 to 14.0.
% Of tertiary phosphite and 1,1-having a group represented by the following general formula (II), (III) or (IV):
The absorbent article according to claim 1 or 2, further comprising a stabilizer comprising a dialkyl-substituted semicarbazide or carbazate. Embedded image Embedded image 4. The absorbent article according to claim 3, wherein the tertiary phosphite has a phosphorus content of 6.0 to 8.0% by weight.