JPH05285170A - Absorptive article - Google Patents

Abstract

PURPOSE:To obtain the absorptive article which has durable hydrophilicity, produces less skin stimuli and does hot cause yellowing by providing a hydrophilic material consisting of nonwoven fabric or perforated film of a polyolefin contg. a hardened castor oil deriv. CONSTITUTION:The absorptive article 1 consists of a liquid permeable surface material 2, a liquid impermeable leakproof material 3 and an absorbent 4 provided therebetween. The surface material 2 is the hydrophilic material consisting of the polyolefinic nonwoven fabric or perforated film stuck with the hardened castor oil deriv. expressed by formula I (x+y+z=100 to 60). The deriv. of a surfactant is preferably incorporated at about 0.5 to 10.0wt.% into the hydrophilic material. As a result, the surface material 2 does not yellow and has the excellent hydrophilicity and durability. Leakage and uncomfortability are thus prevented. Since the stimulation to the skin is small, the surface material 2 to be pressed to the skin is substantially problem-free.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article, and more specifically, a non-woven fabric using a polyolefin composite fiber or a paper diaper using a perforated polyolefin film having pores as a material, The present invention relates to absorbent articles such as sanitary napkins.

[0002]

2. Description of the Related Art Avoiding discomfort caused by sweating, urine, body fluids, etc. when wearing a disposable diaper, sanitary napkin, etc. is that the surface material of those products is easily wetted, and its wettability is exhibited in a short time. Is considered important. for that reason,
The polyolefin fiber or the like that constitutes the surface material is required to absorb the liquid in a short time. At the same time, a disposable diaper or the like can be treated by an infant, an elderly person, a sick person, etc. who cannot handle excrement by themselves, or the excrement can be treated multiple times by wearing it once due to an increased absorption capacity and improved leakage prevention. Therefore, durable hydrophilicity (repeated hydrophilicity) is strongly required. In addition, recently, for the purpose of improving the absorption performance of the absorbent body, it has been attempted to form the cellulose pulp by mixing or laminating hydrophilically modified polyolefin fibers. Also in these, durable hydrophilicity is strongly required. Further, even for hydrophilic materials such as wood pulp, viscose rayon, and vinylon, it is required to further enhance the hydrophilicity without impairing the hydrophilicity and impart durable hydrophilicity. ..

Conventionally, the following methods (1) to (4) are known as techniques for imparting hydrophilicity to the above materials. (1) A method in which a hydrophilic agent is kneaded into a hydrophobic resin and a hydrophilic fiber assembly is obtained from spun fibers. As this method, a method of producing hydrophilic fine fibers having a long fiber length from a multi-component mixed polymer having no compatibility, particularly a method of mixing polyethylene glycol with the polymer, melt-kneading, and producing fibers (JP JP-A-49-529) or a method in which a surfactant is added to polyolefin, a perforated film is formed by heat, and further corona discharge treatment is performed (Japanese Patent Publication No. 1-493).
No. 81). (2) A method of attaching a hydrophilic low molecular weight compound (surfactant). As this method, a method of attaching a fatty acid ester type nonionic surfactant having a high affinity to polyolefin fibers (JP-A-63-6166) and a method of using polyglycerin fatty acid ester (JP-A-2-21626).
No. 5). (3) A method of performing physical treatment such as plasma treatment and corona treatment. A method in which oxygen is excited by high-frequency energy for treatment under reduced pressure to carbonylate the surface (Japanese Patent Publication No. 53-794).
Issue gazette). (4) Chemical treatment Chemical treatment methods such as solvent treatment.

[0004]

However, in the method (1), the addition amount of the surfactant has a great influence on the processability and the performance after bleed-out, and the compound conventionally used is kneaded. If this is the case, it causes yellowing of the resin. In addition, the method (2) is simple, but the wetting of the adhesive on the fiber surface is poor, and not only the expected liquid permeability cannot be obtained, but even if a certain level of liquid permeability is obtained, durability is completely obtained. However, there is a drawback that many of them do not cause skin irritation. (3) and (4) have some good results in skin irritation and liquid permeability, but due to the change with time of polar groups caused by modification,
The hydrophilicity is apt to deteriorate with time, and a large amount of heat and electricity are required for modification, which is not economical. Therefore, it is an object of the present invention to provide an absorbent article that has so-called durable hydrophilicity, has little skin irritation, and does not cause yellowing.

[0005]

The present invention comprises a hydrophilic material comprising a polyolefin-based nonwoven fabric or a polyolefin-based perforated film to which a hydrogenated castor oil-based derivative represented by the following general formula 2 is attached. The above object is achieved by providing an absorbent article characterized by being

[0006]

[Chemical 2] (However, x + y + z = 10 to 60.) Further, the hydrophilic material is used as the surface material of an absorbent article having an absorber and a liquid-permeable surface material covering the surface of the absorber. Is desirable.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view in which a part of a sanitary napkin that is an embodiment of the absorbent article according to the present invention is cut away. FIG. 1 shows an embodiment of a preferred sanitary napkin. The absorbent article 1 which is a sanitary napkin is
It comprises a liquid-permeable surface material 2, a liquid-impermeable leak preventive material 3, and an absorber 4 provided therebetween. The surface material 2 is a hydrophilic material composed of a polyolefin-based non-woven fabric or a polyolefin-based perforated film to which a hydrogenated castor oil-based derivative represented by the following general formula 3 is attached.

[0008]

[Chemical 3] (However, x + y + z = 10-60.)

The above-mentioned derivative of the surfactant imparts hydrophilicity to the above-mentioned polyolefin non-woven fabric or the polyolefin perforated film, and is preferably 0. 5 to 10.0% by weight, particularly preferably 1.0
It is desirable that the content is up to 5.0% by weight. This is because if it is less than 0.5% by weight, the effect as a surfactant cannot be effectively exhibited, and if it is more than 10.0% by weight, spinning and film forming properties are deteriorated.

Further, x + y + z of hydrogenated castor oil-based derivative
The compound has a total value of 10 to 60, preferably 10 to 20. If this value is less than 10, sufficient hydrophilicity cannot be obtained, and since the molecular weight is small, the heat resistance is poor and it decomposes during the production of fibers or films, causing smoke and further yellowing of the resin. From the viewpoint of heat resistance, the one having a higher molecular weight is better. When x + y + z is larger than 60, the bleed-out speed is low and the performance cannot be exhibited. The above ranges are preferable because these values must be compatible with the polyolefin resin to the extent that the processability is not deteriorated, and bleeding out progresses with time to form a surface active layer. Such a derivative is used as an emulsifier of an ester for softening a tire cord or a nylon fiber, and has the advantage that its toxicity is low because it is added together with a drug or the like.

The hardened castor oil-based derivative may be added by adding the above derivative before forming the film.
Alternatively, the above-mentioned polyolefin-based resin may be masterbatched in advance and mixed with the resin so as to obtain a predetermined amount. If necessary, the above-mentioned derivative may be appropriately attached to a non-woven fabric or a perforated film to be contained.

The polyolefin-based perforated film is a film similar to the net-like or three-dimensional mechanical state film used for the surface material of ordinary absorbent articles, and as a material for this polyolefin-based perforated film, , Polyethylene, polypropylene, and copolymers thereof, and the like, with polyethylene being particularly preferable in terms of texture and cost. Further, the polyolefin film is required to have a form having an opening for water permeability. The aperture of such a film is particularly preferably a three-dimensional form in order to control the return of the liquid once absorbed to the body side. The thickness of the effective film is 20 to 1000 μm, especially 300 to 700 μm
It is preferably m.

As a material for the polyolefin-based nonwoven fabric, the above-mentioned polyolefin-based resins are preferable, and ethylene-based fibers are particularly preferable. The resin fiber is not limited to the polyolefin resin fiber, but may be a mixture of other fibers. Further, it is preferable to use a composite fiber having a core-sheath structure in which the high melting point resin is the core and the sheath is polyolefin. The thickness of the fibers used for the non-woven fabric is
0.5-10d is preferable, and the length of the fiber is 5-55mm.
Is preferred.

According to the absorbent article 1 having such a structure,
It can be seen that the hardened castor oil-based derivative kneaded into the surface material 2 does not cause yellowing of the surface material 2 and is excellent in resorbability, as shown in the results of Examples described later. Therefore, since the surface material 2 is excellent in hydrophilicity and durability, body fluid and the like near the surface of the absorbent article are rapidly and continuously absorbed by the absorbent body when the absorbent article is mounted. Therefore, leakage from the absorbent article is prevented and discomfort is prevented. Further, since the above-mentioned derivative has a low skin irritation, the surface material 2 that comes into contact with the skin causes almost no problem. The hydrophilic material is particularly suitable as a liquid-permeable surface material that covers the surface of the absorber,
The present invention is not limited to this, and may be a woven fabric, a non-woven fabric, or the like used for the absorbent body of the absorbent article, and the non-woven fabric is preferable.
In this case, during the production of the absorbent article, the hydrophilicity of the absorbent body can be easily controlled by the amount of the hydrophilic material.

[0015]

【Example】

Examples 1, 2 1. Hardened castor oil derivative (x + y + z = 10) was added to polyethylene in an amount of 10 wt%, premixed with a pelletizer and then kneaded with a biaxial kneader to form a masterbatch. The base resin was added to the masterbatch, mixed by a dry blending method, and the addition amount was set to 5 wt%. A perforated film having a thickness of 600 μm was prepared using the obtained resin. 2. A composite fiber composed of polyethylene terephthalate as the core and polyethylene as the sheath, and 2 wt% of hydrogenated castor oil derivative (x + y + z = 10) was kneaded into the sheath component and spun into a thickness of 3d. The obtained fiber was cut into a length of 55 mm. The hydrophilic fiber thus obtained was formed into a web using a carding machine and heat set at 140 ° C. to obtain a nonwoven fabric. The hydrophilic film or nonwoven fabric obtained in Examples 1 and 2 was wrapped with a commercially available absorber of a napkin to obtain an evaluation sample.

Comparative Examples 1 to 4 1. Polyoxyethylene lauric acid ester (EO 12 mol adduct) was applied to the resin surface of a 600 μm-thick polyolefin-based porous film at a coating amount of 0.05 g / m ² . 2. 0.05 g / of polyoxyethylene lauryl ether sulfate (EO 3 mol adduct) is applied to the resin surface of a 600 μm thick polyolefin porous film.
The coating amount was m ² . 3. Polyoxyethylene lauric acid ester (EO 1
2mol addition product) is added to polyethylene at 10wt%,
After premixing with a pelletizer, the mixture was kneaded with a biaxial kneader to form a masterbatch. Base resin was added to the masterbatch and mixed by the dry blending method, and the addition amount was 5 wt.
Set to%. A perforated film having a thickness of 600 μm was prepared using the obtained resin. 4. A 3d composite fiber having a polyethylene terephthalate core and a polyethylene sheath and having a polyoxyethylene lauryl ether sulfate (E) content of 0.3 wt% of the fiber weight.
O 3 mol adduct) was applied. The obtained fiber was cut into a length of 55 mm and made into a web using a card machine. 1
A nonwoven fabric was obtained by heating and setting at 40 ° C. As in the case of the example, the obtained sample was wrapped with an absorber of a commercially available napkin to give an evaluation sample. The absorbency of each of these was evaluated by the following test methods.

Examples 3 and 4 3. A sample was prepared in the same manner as in Example 1 except that the hardened castor oil derivative (x + y + z = 40) was kneaded. 4. A sample was prepared in the same manner as in Example 1 except that the hardened castor oil derivative (x + y + z = 60) was kneaded. The obtained sample wrapped the absorber of a commercially available napkin and used as an evaluation sample. The absorbency of each of these was evaluated by the following test methods.

Comparative Examples 5 to 7 5. A sample was prepared in the same manner as in Example 1 except that the hardened castor oil derivative (x + y + z = 80) was kneaded. 6. Untreated film was used as a sample. 7. Untreated non-woven fabric was used as a sample. The obtained sample wrapped the absorber of a commercially available napkin and used as an evaluation sample. The absorbency of each of these was evaluated by the following test methods. The results are shown in Table 1.

Test method Glycerin solution absorption time A commercially available napkin absorber was wrapped with a test piece and sandwiched between glass cylinders having an inner diameter of 35 mm. 5 cm ³ of a glycerin / water = 85/15 wt% solution was poured from above and the time taken to absorb all the solutions was measured. Yellowing evaluation method The sample was placed in a fade meter, stored at 63 ° C., and the yellowing state with time was visually observed. ◎ indicates that no yellowing was observed even after irradiation for 78 hours,
Those in which yellowing was hardly recognized were marked with O, and those in which yellowing was recognized in a short time were marked with X. Evaluation of reabsorption property A test piece cut into 50 mm x 50 mm is placed on an absorbent body of a commercially available napkin, and the whole is washed away with 50 cc of ion exchange water.
After completion of washing (absorption), the mixture was left for 3 minutes and dried in an electrolytic dryer at 80 ° C. After sufficiently drying, drop the droplets with a dropper,
When the absorption performance was not deteriorated compared with that before the cleaning, it was evaluated as ◯, when partial absorption inhibition was evaluated as Δ, and when the absorption was not exhibited at all, it was evaluated as x.

[0020]

[Table 1] K: hydrogenated castor oil derivative POEL: polyoxyethylene lauric acid ester (E
O 12 mol adduct) ES: polyoxyethylene lauryl ether sulfate sodium salt (EO 3 mol adduct)

[0021]

The absorbent article according to the present invention has so-called durable hydrophilicity, causes little skin irritation, and does not cause yellowing.

[Brief description of drawings]

FIG. 1 is a perspective view in which a part of a sanitary napkin, which is an embodiment of an absorbent article according to the present invention, is cut away.

[Explanation of symbols]

 1 Absorbent article (sanitary napkin) 2 Surface material 3 Leak preventive material 4 Absorber

Claims (3)

[Claims] 1. An absorption characterized by comprising a hydrophilic material comprising a polyolefin non-woven fabric or a polyolefin perforated film containing a hydrogenated castor oil derivative represented by the general formula of the following chemical formula 1. Sex goods. [Chemical 1] (However, x + y + z = 10-60.) 2. The hydrophilic material is used as the surface material of an absorbent article having an absorbent body and a liquid-permeable surface material covering the surface of the absorbent body. The absorbent article according to 1. 3. The absorbent article according to claim 1, wherein the hydrophilic material contains the hydrogenated castor oil-based derivative in an amount of 0.5 to 10.0% by weight. ..