JP3356357B2 - Porous sheet and absorbent article using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous sheet and an absorbent article using the same. More specifically, the present invention relates to a porous sheet having excellent tensile strength and molding productivity, and having moisture permeability, water pressure resistance and the like. The present invention relates to a sheet and an absorbent article using the same.

[0002]

2. Description of the Related Art
As a method for producing a porous sheet, a method is known in which an inorganic filler of at least 40 parts by weight is melt-kneaded in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then uniaxially or biaxially stretched. I have. The porous sheet obtained in this manner is excellent in air permeability and moisture permeability and does not cause dew condensation, so that it is suitably used for wallpaper, wrapping paper and the like. Further, by imparting flexibility to such excellent properties of the porous sheet, the porous sheet can be used as a back material of a disposable diaper. In order to impart flexibility to the porous sheet, it has been proposed to use linear low-density polyethylene as the olefin resin.

[0003] Disposable diapers that are commonly used are:
An absorber that absorbs excretions such as urine, a surface material that covers the surface of the absorber and is applied to the skin, and a back material that covers the absorber and prevents liquid leakage, are bonded and integrated. ing. In addition, the elastic function provided to prevent wetting from the waist circumference and leg circumference and the fastening function consisting of tape etc. to fasten the back waist circumference and the abdominal waist circumference when the diaper is attached Have. The fastening tape having a width of about 25 mm is preferably used frequently for convenience. If you try to peel off the fastening tape for diaper mounting errors or urination inspection while wearing, the back material that has added flexibility will be broken due to insufficient strength,
I have to replace it with a new one. In order to prevent this, a wide holding tape (commonly called landing tape) is pasted on the back material of the ventral torso, and a fastening tape (commonly called fastening tape) is attached on it when attaching. The fastening tape can be repeatedly attached and removed.

However, the use of a landing tape has the disadvantage of increasing the number of diaper components and manufacturing steps. Since the landing tape is the most expensive of diaper materials, using a wide (large amount) of the tape increases the cost. Further, even if the landing tape is wide, even if the landing tape is used in a wide range, the fastening tape may adhere to a backing material other than the landing tape depending on the body shape of the wearer, and the fastening tape cannot be peeled off.

As a high-strength porous sheet, Japanese Patent Application Laid-Open No.
No. 98057, “a method of blending a specific polyolefin with a filler, a specific plasticizer, and a radical generator, inflation molding, and further uniaxially stretching in a take-off direction”
Has been proposed. However, such an improved porous sheet has a strength up less than twice that of a stretched sheet from a molded sheet obtained by melt-kneading an inorganic filler in a usual olefin resin.
However, a landing tape such as a disposable diaper cannot be omitted with such strength. Furthermore, when a radical generator is used, the melt flow characteristics of the molded article are different from those of the composition before molding, so that it becomes difficult to recycle unnecessary portions such as edges generated in a normal actual production process,
There is a problem that productivity is poor.

As another method for producing a porous sheet, Japanese Patent Publication No.
JP-A-38011 discloses that a specific crystalline polymer and a specific compound (miscible with the polymer) are melt-blended, formed into a sheet, phase-separated in a cooling process, and stretched to obtain a fine sheet. Method for producing porous sheet ". Such a microporous sheet can have a strength 2-3 times that of a stretched sheet obtained by melting and kneading an inorganic filler in an ordinary olefin resin. However, this still does not have the strength to save the landing tape. Investigations by the present inventors have shown that the strength is required to be at least 4 times, preferably 5 times as high as that of a porous sheet produced by an ordinary production method.

Further, in the formulation of such a microporous sheet, since the volatilization temperature of the compound used is low, not only there is a danger of environmental pollution and ignition due to smoking at the time of forming the sheet, but also,
Volatile substances adhere to the die lip and cause a burn, commonly called "eye stain". Therefore, there has been a problem that the disassembly and cleaning after the molding is interrupted frequently, and the industrial productivity is extremely poor. Accordingly, an object of the present invention is to provide a porous sheet having air permeability, moisture permeability, and water resistance, and having high strength and excellent productivity which can be continuously produced at high speed and industrially safe and at high speed. An object of the present invention is to provide an absorbent article using the same.

[0008]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, have found that a crystalline polyolefin resin having a specific melt index and a compound having a specific volatilization temperature and a melting point have been obtained. It has been found that the above object can be achieved by finding that when a porous sheet is obtained by melt-kneading a specific amount of the above, a sheet having an extremely high tensile yield point strength is obtained.

The present invention has been made based on the above findings, and has 55 to 90 parts by weight of a crystalline polyolefin resin having a melt index of 3 g / 10 minutes or less, an ester bond in the molecule, and volatilization at normal pressure. the sheet molded from the resin composition containing the temperature 240 ° C. or more and a melting point of 45 to 10 parts by weight 100 ° C. the following compounds, Ri name by stretching in at least one direction, said compound, and a monocarboxylic acid Many
There is provided a porous sheet, wherein esters der Rukoto with a polyhydric alcohol. The present invention also provides an absorbent article comprising a liquid-permeable surface material, a leak-proof backing material, and an absorber disposed between these two-sided materials. The present invention provides an absorbent article characterized by using:

Hereinafter, the porous sheet according to the present invention and an absorbent article using the same will be described in detail. The porous sheet according to the present invention is a sheet obtained by forming a resin composition into a sheet shape and stretching, and the resin composition is made of a crystalline polyolefin resin and a compound having an ester bond in a molecule, and if necessary. Fillers, coloring agents and the like are included.

The crystalline polyolefin resin used in the present invention is mainly composed of a polypropylene resin. In addition, a copolymer resin of propylene and ethylene or propylene and ethylene and / or other vinyl resins contained to such an extent that crystallinity is not impaired. It may be a copolymer resin with a monomer. The crystalline polyolefin resin has a melt index of 3 g / 10 minutes or less, preferably 0.2 to 3 g / 10 minutes. Among them, the melt index generally used for extrusion molding is 0.2
A crystalline polypropylene resin having a content of ２2 g / 10 minutes and a crystalline ethylene-propylene copolymer resin having an ethylene content of 20% by weight or less are preferred. Especially texture and strength (yield point strength)
From the viewpoint of the backing material of the absorbent article, ethylene is 3 to
Most preferred is 15% by weight of a crystalline ethylene-propylene copolymer resin. It is also preferable to use a mixture of two or more of the above-mentioned polymers or copolymers.

The above resin has a melt index of 3 g / 1.
If a porous sheet longer than 0 minutes is used, its strength is reduced, and it becomes difficult to obtain the necessary strength as a backing material of a disposable diaper or the like. In order to obtain the required strength, it is conceivable to increase the thickness of the porous sheet. However, when the thickness is increased, the moisture permeability decreases and the cost of the product increases. Further, if the tear strength of the porous sheet is insufficient, a sufficient effect cannot be expected even if the thickness is increased.
If the melt index of the resin is less than 0.2 g / 10 minutes, there arises a problem that a large power is required for the extrusion during sheet molding. In the present invention,
The melt index refers to a value measured at 230 ° C. and 2.16 kgf according to ASTM D-1238.

The compounds having an ester bond in the molecule used in the present invention, mono-salts functionalized carboxylic acid and an aliphatic aliphatic or aromatic, of a polyhydric alcohol alicyclic or aromatic
Ester compounds obtained from by that dehydration condensation reaction combination (i.e., mono- or polyester) is. Examples of the compound having an ester bond in the molecular, polyhydric alcohols (especially polyhydric alkyl alcohols) and the ester compound of a monocarboxylic acid (in particular aliphatic monocarboxylic acid) (i.e., mono- or polyester) are preferred. Grayed Li <br/> serine in the medium, diglycerol, trimethylol propane, pentaerythritol, polyhydric alcohol and capric acid, such as dipentaerythritol Li tote or sorbitan lauric acid, palmitic acid, stearic acid or oleic acid And the like, and an ester compound obtained from an aliphatic monocarboxylic acid. It is also preferable to add a small amount of a polycarboxylic acid such as adipic acid to the ester such that the obtained ester compound does not gel. Further, from the viewpoints of environmental pollution prevention and safety, a polyester obtained from an aliphatic carboxylic acid and an aliphatic alcohol is preferable. The ester compound can be prepared from one or more of the above carboxylic acids and one or more of the above alcohols. The preparation method is not particularly limited, and any conventionally known esterification method can be used. Further, the ester compound is not only an ester in which all of the carboxyl groups in the carboxylic acid and the hydroxyl groups in the alcohol are completely reacted, but also a part of the carboxyl groups in the carboxylic acid and / or some of the hydroxyl groups in the alcohol are unreacted. It may be a partially esterified compound left as it is.

The compound having an ester bond has a volatilization temperature at normal pressure of 240 ° C. or higher, preferably 25 ° C.
0 ° C. or higher, and the melting point of the compound is 100 ° C. or lower, preferably 80 ° C. or lower. The sheet forming temperature of the resin composition of the crystalline polyolefin resin and the compound in the present invention is 180 to 250 ° C., preferably 190 to 24 ° C.
0 ° C. If the volatilization temperature of the compound having an ester bond in the molecule at normal pressure is lower than 240 ° C., smoke of the volatile matter is easily generated at the time of sheet molding. Smoke of volatiles at the time of molding not only poses a risk of environmental pollution and ignition, but also causes the volatiles to adhere to the die lip and cause burning, commonly known as "eye stain". Therefore, the sheet forming must be interrupted once and the disassembly and cleaning of the die lip must be performed frequently, and the industrial productivity is extremely poor. For this reason, the preferable volatilization temperature of such a compound is 250 ° C. or more, and the particularly preferable volatilization temperature is 260 ° C. or more.

The reason why the melting point of the compound is limited to 100 ° C. or less is that when the formed sheet is stretched, the compound is easily softened or melted at the stretching temperature, so that the sheet can be finely divided easily. The melting point is more preferably 80 ° C. or less for making the material porous. In addition, the "volatile temperature" used in this specification
Means using a thermobalance in a nitrogen stream (30 ml / min),
Measured at 10 ° C./min at a rate of temperature increase of 10 mg of a sample, drawn a heating weight loss curve, and means a temperature of 1% of the weight loss.

Specific preferred compounds satisfying such conditions include distearyl phthalate, trioctyl trimellitate, tetraoctyl pyromellitate, distearyl adipate, distearyl sebate, trimethylolpropane trilaurate, pentane Erythritol tetracaprate and the like can be mentioned. These can be selected from combinations of the solubility parameter of the crystalline polymer and several units or less.

The crystalline polyolefin resin (hereinafter, abbreviated as “resin”) used in the present invention has an ester bond in the molecule, and has a volatilization temperature of 240 ° C. or more at normal pressure and a melting point of 100 ° C.
The compounding ratio of the following compounds (hereinafter abbreviated as “compounds”)
55 to 90 parts by weight of “resin” and 45 to 1 part of “compound”
0 parts by weight, preferably 35 to 20 parts by weight of the “compound” to 65 to 80 parts by weight of the “resin”. When the amount of the “compound” is more than 45 parts by weight, the sheet formability of the resin composition is inferior, and the strength of the porous sheet obtained by stretching treatment is insufficient, and the compound bleeds out from the sheet during long-term storage. And lacks practicality. On the other hand, if the amount is less than 10 parts by weight, a porous sheet satisfying a sufficient moisture permeability cannot be obtained by the stretching treatment.

If necessary, a filler, a coloring agent, and the like can be added to the resin composition having the above-mentioned compounding ratio. Fillers, colorants and the like are not particularly limited, and are generally used for rubber, plastic, and the like, for example, calcium carbonate,
Examples include gypsum, barium sulfate, talc, clay, titanium oxide, metal powder, and other inorganic or inorganic metal salts. Further, a granular or powdery material of a thermosetting resin such as a phenol resin, an epoxy resin, or sodium polyacrylate can also be used. These fillers are 50 μm or less,
It is preferably used as a powder having an average particle diameter of 0.1 to 5 μm. The coloring agent is used regardless of organic or inorganic. Further, if necessary, a small amount of a usual resin property improving agent such as a stabilizer and an antistatic agent can be used so as not to adversely affect the basic properties of the porous sheet of the present invention.
These additives are used in an amount of 0.1% based on the total amount of the resin composition.
-30% by weight, preferably 1-20% by weight.

In the sheet forming from the melt-kneaded product of the resin composition, the melt-kneading is preferably performed by a kneading method using a commonly used twin-screw kneading extruder. For actual production, "resin" is supplied from a hopper. Then, it is preferable to press-in the “compound” with a metering pump from the kneading portion (middle portion) of the extruder where the resin is plasticized. When the melting point of the “compound” is higher than the room temperature, the “compound” is heated to a temperature higher than the melting point to be liquefied and injected. In the sheet forming following the melt kneading, the molten resin composition is supplied to the die through a gear pump attached to the discharge portion (tip) of the twin screw kneading extruder, or the twin screw kneading extruder and the single screw extruder are combined in tandem. It is preferable to supply the mixture to a die via a single screw extruder.

Further, the melt-kneaded material (compound) is extruded into a filament form by a twin-screw kneading extruder, cut into pellets, and then supplied to a single-screw extruder equipped with a die. A molding method is also good. When the melt-kneaded material is formed into pellets, the cooled filament is stretched about 1.2 to 1.5 times and then cut, rather than cooling and cutting the molten resin composition extruded into ordinary filaments as it is. It is desirable. If this step is omitted, a part of the "compound" bleeds on the surface of the filament, so that biting into the next single-screw extruder becomes poor and sheet formability may be poor. The sheet may be formed by a flat die or a circular die, but is preferably formed by a circular die from the viewpoint of sheet yield.

Furthermore, in order to obtain the porous sheet of the present invention with good yield, the cooling conditions in forming the resin composition sheet are important. That is, it is important to produce crystals (crystal size) of the crystalline polyolefin resin by cooling the molten resin composition. For example, the production of a maximal crystal by remarkable slow cooling,
Also, the generation of fine crystals by remarkable quenching prevents uniform stretching in the subsequent stretching treatment, resulting in a resultant porous sheet having low strength and low moisture permeability. Preferred cooling conditions are such that the time between the temperature at which the resin composition is discharged from the die and the melting temperature of the crystalline polyolefin resin is 0.1 to 3 times.
sec, the time to further decrease the melting temperature by 100 ° C. is 2-2.
0 sec. For example, in the case of a resin composition using polypropylene having a melting point of 175 ° C, the melt-kneading temperature is 220 to
240 ° C, the melting temperature is 158-160 ° C,
The former time is 0.8 to 2.0 sec, the latter time is 5 to 2.0 sec.
It is 20 seconds.

Further, the function of a nucleating agent (crystal nucleating agent) is also important. Crystalline polyolefin resins already on the market contain nucleating agents as high-rigidity, high-cycle grades, and substances that have a nucleating agent function even if not compounded as nucleating agents. There are some. It is preferable to add a nucleating agent as needed to a grade to which these are not added and a grade to which the effect of the nucleating agent is inferior, if necessary. The nucleating agent used is not particularly limited, and a nucleating agent known in the art may be used. For example,
Plastics (issued by the Industrial Research Council) Vol. 43, N
o. “Function and effect of plastic compounding agent = nucleating agent” is introduced on pages 11, 113 to 116. Specific examples include a metal salt of an aromatic carboxylic acid (such as Al-PTBBA), a sorbitol derivative, an organic phosphate (such as PTBNa), a high-melting polymer nucleating agent, and talc as an inorganic nucleating agent.

The stretching of the sheet of the resin composition in the porous sheet according to the present invention may be carried out by uniaxial stretching in the machine direction (MD) or by uniaxial stretching followed by a tenter stretching machine, an air inflation stretching machine or a mandrel stretching. It is obtained by successively biaxially stretching in the transverse direction (TD) using a machine or the like, or by simultaneously biaxially stretching in the longitudinal and transverse directions.
In this case, the stretching temperature is generally a temperature not lower than room temperature and at least 10 ° C. lower than the melting point of the resin composition, and particularly preferably a temperature lower than the melting point by 30 ° C. or higher. Also, the stretching ratio is at least 1.1 times in the uniaxial direction (original length: 1.0 and the length after stretching: 1.1) or more, preferably from 1.3 times to 6 times, that is, in the case of uniaxial stretching. Is preferably in the longitudinal direction, and in the case of biaxial stretching, 1.1 to 6 times in the longitudinal direction and the transverse direction, respectively, in order to maintain mechanical balance and strength, and to develop excellent moisture permeability and water pressure resistance. .

The porous sheet according to the present invention has a moisture permeability.
Is 0.5 to 4.0 g / 100 cm^Two・ Hr, especially 0.8
~ 2.5g / 100cm^Two・ Hr is desirable
No. 0.5g / 100cm moisture permeability^Two・ Below Hr
And the effect of preventing stuffiness as a backing material of the absorbent article is poor
4.0g / 100cm^Two・ Hr is exceeded
In this case, the water pressure resistance is reduced, and the leakproofness is reduced. Porous sheet
If used for absorbent articles such as disposable diapers,
The water pressure resistance of the sheet is 1.5 mAq or more, particularly preferably.
Needs to be 2.0 mAq or more. Also book
The porous sheet according to the present invention has a tensile yield point strength of 11
0kgf / cm ^TwoOr more, particularly preferred.
Or 120kgf / cm^TwoAbove, more preferably 13
0kgf / cm^TwoThat is all.

Next, the absorbent article according to the present invention will be described in detail. The absorbent article according to the present invention includes a disposable diaper,
There are incontinence briefs, sanitary napkins, and the like.For example, disposable diapers include an absorbent body that absorbs excretions such as urine, a surface material that covers the surface of the absorbent body and is applied to the skin, and covers the absorbent body to prevent liquid leakage. It is made of a backing material for preventing the above, and these are adhered and integrated. In addition, the fastening function consisting of a fastening tape for fastening the back side waist part and the abdominal side waist part when the diaper is attached, provided with a telescopic function provided to prevent wetting from the waist circumference and leg circumference. Has functions. The fastening tape having a width of about 25 mm is preferably used frequently for convenience.

The above-described porous sheet according to the present invention is used for the back material. The thickness of the back material used for disposable diapers is usually 25 μm or more, and preferably 35 μm or more, because of the flexibility required for the diaper, the waist of the sheet required when assembling the diaper, and the sense of security using the back material. However, the flexibility and cost required for diapers are 55
μm or less, preferably 45 μm or less.

In the disposable diaper constructed as described above, the strength of the back material required for directly attaching and detaching the fastening tape to the back material without the so-called landing tape is determined by the tensile yield point strength per sheet width of 1 cm. It is required to be at least 600 gf, preferably at least 700 gf, particularly preferably at least 800 gf. Therefore, a thickness of 55μ
109 kgf /
A strength of at least cm ² is required for the backing material. in this way,
The back material of the disposable diaper has a sufficient strength when the tensile yield point strength is 110 kgf / cm ² or more as described above. Therefore, there is no need to use a landing tape, so that there is no diaper mounting error, and even if the diaper is peeled off during inspection for urination inspection, the back material is not broken. In addition, if the moisture permeability of the back material is in the above range, no stuffiness or the like occurs, and a comfortable wearing feeling can be maintained.

[0028]

[ Reference Examples 1 to 5 and Comparative Examples 1 and 2 (porous sheet)]

· "Resin" and incorporation of "compound": Density 0.91 g / cm ³ as "resin", melt index 0.4 g / 10 min, melting point 169 ° C. of the crystalline polypropylene (Chisso Petrochemical Co., Ltd., Chisso HCPPXF19
32) was supplied at 270 cm ³ / min, and the following various samples of the “compound” were “resin”: “compound” = 70: 3
The mixture was supplied to a twin-screw kneading extruder described below so that the weight ratio became 0 (weight ratio).

[0029] - "compound" of the various samples: "compound" = phthalic acid and stearyl alcohol ester (acid value = 0.1, OH value = 0.2: abbreviated DSP) of Reference Example 1 Reference Example 2 " Compound "= esterified product of phthalic acid and isotridecyl alcohol (Vinicizer # 2 manufactured by Kao Corporation)
0: abbreviation DTDP) "Compound" of Reference Example 3 = esterified product of trimellitic acid and 2-ethylhexyl alcohol (Tomex T-08: abbreviation TOT, manufactured by Kao Corporation) "Compound" of Reference Example 4 = pyromellitic acid (Compound) of Reference Example 5 = esterified product of adipic acid and stearyl alcohol (acid value = 0.2, OH value = 0) and esterified product of 2-ethylhexyl alcohol and Pyromex P-08 (abbreviated to TOP, manufactured by Kao Corporation) .2:
"Compound" of Comparative Example 1 = "compound" = mineral oil (Flow Para 350S, Chuo Kasei Co., Ltd., flash point 220 ° C, aniline point 112 ° C, aroma system / naphthene system / paraffin system = 0/34/66: abbreviation 350S "Compound" of Comparative Example 2 = esterified product of phthalic acid and 2-ethylhexyl alcohol (Vinicizer # manufactured by Kao Corporation)
80: DOP) The physical properties of the “compound” are shown in Table 1.

[0030]

[Table 1]

Sheet forming: Biaxial kneading extruder (φ45 m
A circular die (φ200 mm) was connected to the tip (discharge port) of m, L / D = 33.5) via a gear pump. Then, air-cooled inflation molding equipment having a distance from the die to the nip roll of 4 m was used. The “resin” was supplied from a hopper, and the “compound” heated and liquefied was injected into the middle (kneading) portion of the twin-screw kneading extruder by a gear pump. The set temperature is 190 ° C. for the cylinder C1 part (hopper side) of the extruder, 210 ° C. for the C2 part, and 2 for the C3 to C8 parts.
The temperature was 40 ° C, the gear pump section was 230 ° C, and the die was 230 ° C. A sheet having a sheet folding width of 60 cm and a take-up speed of 8 m / min was obtained at a thickness of 40 μm while blowing air at 20 ° C. onto the bubble from an air ring and forcibly air-cooling.

Stretching treatment: Using a roll stretching machine having a width of 1 m, the sheet is stretched 1.6 times in the forming direction at 60 ° C., and subsequently 1.5 times by annealing (1.5 times before stretching).
Times). All the obtained sheets were 36 to 38 μm.

Evaluation criteria for porous sheet (1) Smoke emission at the time of molding: The smoke emission state of volatiles at the time of molding the sheet was visually judged according to the following criteria. ：: No smoke was generated. ：: A little smoke. Δ: Smoke is generated. ×: Extremely large amount of smoke. (2) Eye tarnish generation (accumulation) time: The time until the occurrence of a die line which can be visually observed on the sheet surface in the sheet molding was measured. (3) Sheet formability: visually determined according to the following criteria. ：: Valve stable, no die line. ：: Valve stable, with die line. Δ: Valve fluctuation. ×: Molding not possible. (4) Stretchability: ：: No cutting, uniform whitening *. * It has been confirmed that whitening and stretching are correlated. ：: No cutting, slight whitening unevenness. Δ: No cutting, many whitening unevenness. X: Disconnection. (5) Tensile yield point strength: 10 mm in the direction perpendicular to the stretching direction
300mm / min width sheet by Tensilon tensile tester
Measured at (6) Moisture permeability; measured according to JIS Z0208. (7) Water pressure resistance: Table 2 shows the evaluation of the porous sheets of Reference Examples 1 to 5 and Comparative Examples 1 and 2 based on the JIS L1093B method.

Comparative Example 3 A density of 0.90 g / cm ³ was used instead of the “resin” of the reference example.
Using crystalline polypropylene having a melt index of 0.5 g / 10 min and a melting point of 170 ° C. (manufactured by Chisso Petrochemical Co., Ltd., Nisso PP FM101), using the same DOP as “Comparative Example 2” for the “compound”, a sheet manufacturing method The evaluation method was the same as in Reference Example 1. Table 2 shows the evaluation for obtaining the porous sheet and the evaluation results of the obtained sheet.

[0035]

[Table 2]

[0036]

[Examples 1 and 2 and Comparative Examples 4 and 5 (Porous Sheet)] In Examples 1 and 4 in place of the “resin” of Reference Example 1, a density of 0.91 g / cm ³ and a melt index were used. 0.
Using crystalline block copolymerized polypropylene (manufactured by Chisso Petrochemical Co., Ltd.) containing 5 g / 10 min, melting point of 168 ° C. and 8% by weight of ethylene (manufactured by Chisso Petrochemical Co., Ltd.), an esterified product of lauric acid and trimethylolpropane (acid value) = 0.
24, OH value = 3.8: TTL for short, and mineral oil (Diana Process Oil PW-90, Idemitsu Kosan Co., Ltd., flash point 2)
72 ° C., aniline point 127.7 ° C., aroma system / naphthene system / paraffin system = 0/29/71: Abbreviation PW-90)
Was used. In Example 2 and Comparative Example 5, the “resin” of Reference Example 1 was used, and “TTL” and PW-9 were respectively used as the “compounds”.
0 was used. Table 3 shows the physical properties of TTL and PW-90. The sheet manufacturing method and the evaluation method were the same as in Reference Example 1, and evaluation (8) was additionally performed. Table 4 shows the evaluation for obtaining the porous sheet and the evaluation of the obtained sheet. Evaluation (8) Texture ◎: Flexible and very good texture ○: Flexible and good texture △: Somewhat hard and slightly bad ×: Hard and poor texture

[0038]

[Table 3]

[0039]

[Table 4]

[0040] Example 3 and Comparative Example 6-7 (disposable diapers)] Example 1, the ratio Comparative Examples 1 of the porous sheet, and a porous sheet on the back member according to the conventional linear low density polyethylene and calcium carbonate used, the surface material, absorbent, disposable diaper comprising a back sheet, and fastening tape (but without the use of landing tapes) was produced (sequentially performed example 3, and the ratio Comparative examples 6 and Comparative example 7.). As a result, Example 3 was compared with Comparative Example 1
Diaper using the sheet and the conventional backing material (Comparative Example 6)
And 7) the fastening tape was more easily peeled off. In particular, the diaper of Comparative Example 7 did not peel off at all, and the back material was completely torn. Further, in the texture, the diaper of Example 3 was soft and exhibited the best feeling.

[0041]

The porous sheet of the present invention has air permeability, moisture permeability, and water resistance, and has high strength and excellent productivity which enables industrially safe and high-speed continuous production. ing. In addition, the absorbent article of the present invention is excellent in convenience and economical because the fastening tape can be attached and detached without using a landing tape.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // C08L 23:02 (56) References JP-A-5-98057 (JP, A) (58) Fields investigated (Int.Cl. . ⁷ , DB name) C08J 9/00

Claims (4)

(57) [Claims] 1. 55 to 90 parts by weight of a crystalline polyolefin resin having a melt index of 3 g / 10 min. Or less, an ester bond in the molecule, a volatilization temperature at normal pressure of 240 ° C. or higher and a melting point of 100 ° C. or lower. d of the sheet molded from the resin composition comprising a compound 45-10 parts by weight, Ri name by stretching in at least one direction, said compound, a monocarboxylic acid and a polyhydric alcohol
Porous sheet characterized by ester der Rukoto. 2. The porous sheet according to claim 1, wherein the crystalline polyolefin resin is a polypropylene resin or a copolymer resin of propylene and ethylene. 3. A water vapor transmission rate of 0.5 to 4.0 g / 100 cm.
Porous sheet according to claim 1 or 2, wherein the a ² · Hr. 4. A liquid permeable surface material, the leak-barrier properties of the backsheet, the absorbent article comprising an absorbent body arranged between these two sides materials, as the back sheet, according to claim 1 to 3 An absorbent article using the porous sheet according to any one of the above.