JPH08311717A - Splittable conjugate polyolefin fiber and nonwoven fabric - Google Patents

Abstract

PURPOSE: To obtain the subject fiber capable of suppressing the generation of static electricity during carding process by kneading a specific amount of a hydrophilic component into at least one component of the conjugate fiber. CONSTITUTION: A hydrophilic component (e.g. an ethoxylated alkylphenol) is kneaded in an amount of 1.0-7.0wt.% into at least one of polyolefin resin components constituting a splittable conjugated fiber. A sufficiently and uniformly split ultrafine fiber nonwoven fabric is obtained in decreased number of steps in a process for producing a nonwoven fabric by a high-pressure water jet and the obtained nonwoven fabric has excellent wiping performance, softness and hydrophilicity.

Description

Detailed Description of the Invention

[0010]

TECHNICAL FIELD The present invention relates to a polyolefin-based splittable conjugate fiber. More specifically, it suppresses the generation of static electricity during the carding process, and has a very excellent splittability, and is a polyolefin-based splittable conjugate fiber, and hydrophilicity, flexibility, and wipeability obtained by using the splittable conjugate fiber. It relates to a good ultrafine fiber nonwoven fabric.

[0011]

2. Description of the Related Art In recent years, woven fabrics or non-woven fabrics using ultrafine fibers have been widely used because of their excellent flexibility, touch, wiping properties, and high strength of non-woven fabrics. For example, a multi-core type composite fiber manufactured from two or more kinds of resins with different solubilities, a so-called sea-island type composite fiber is woven into a woven fabric, and then the sea component is removed to obtain an ultrafine fiber. A method for obtaining a woven fabric of fibers (Japanese Patent Publication No. 43-7411),
As another method, a composite fiber in which two or more kinds of components having low compatibility with each other are joined, that is, a so-called split type composite fiber, which is formed into a web by a dry method or a wet method and then subjected to mechanical impact such as high pressure water flow A method of dividing and entangled fibers to obtain an ultrafine fiber nonwoven fabric (Japanese Patent Publication No. 48-28005, Japanese Patent Application Laid-Open No. 5-321018, Japanese Patent Publication No. 6-361).
No. 29) is generally performed.

However, the method using the sea-island type composite fiber has a problem that the manufacturing process is complicated because it includes a weaving process, a fiber dissolving and removing process, and the like. On the other hand, the method using the splittable conjugate fiber is a web obtained by the card method,
By simultaneously dividing and entanglement the fibers with a high-pressure water stream, an ultrafine fiber nonwoven fabric can be obtained relatively easily. However,
The resin that constitutes the splittable conjugate fiber must be easily split by mechanical impact and is generally combined as a combination of polyamide resins, polyester resins and polypropylene resins, and polyethylene resins that are less compatible with each other. Therefore, when the web is formed through the steps such as the card method in the dry method, a divided portion is generated in the middle of the step or the division is insufficient. Usually, synthetic fibers have a surface-active agent attached to the surface of the fibers in order to suppress the generation of static electricity during the processing process, but the surface area of the fibers increases due to the generation of the above-mentioned divided parts, and static electricity is generated. Therefore, the card passage property is significantly deteriorated. Further, in order to suppress the generation of static electricity, even when a fiber finishing agent is additionally attached during the carding process, problems such as contamination of the carding machine and reduction of web strength occur.

In the conventional polyolefin-based splittable conjugate fiber, the hydrophilic surfactant attached to the surface of the fiber as a fiber finishing agent is rapidly washed away in the process of forming a nonwoven fabric by high-pressure water flow. However, polyolefin resins typified by polypropylene and polyethylene have extremely strong hydrophobicity with an official moisture regain of 0%, so the fibers avoid high-pressure water flow at the initial stage of the nonwoven fabric formation process due to high-pressure water flow, and the impact of water Energy cannot be received uniformly.
Therefore, unless the number of high-pressure water streams is increased, a sufficiently uniformly divided ultrafine fiber nonwoven fabric cannot be obtained.

[0014]

The object of the present invention is to suppress the generation of static electricity during the carding process of the splittable conjugate fiber, which is the problem of the above-mentioned prior art, and to have an excellent wiping property.
It is to provide an ultrafine non-woven fabric having flexibility and hydrophilicity.

[0015]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors knead and add a hydrophilic component to at least one component of a polyolefin resin that constitutes a splittable conjugate fiber. I knew that I could solve the above problems. That is, the inventors have found that the intended purpose can be achieved by precipitating a hydrophilic component on the interfacial portion where the polyolefin-based splittable conjugate fiber divides, and have completed the present invention.

The present invention has the following configurations. (1) A splittable conjugate fiber mainly composed of a polyolefin resin, wherein at least one component has a hydrophilic component of 1.
A polyolefin-based splittable conjugate fiber kneaded and added in an amount of 0 to 7.0% by weight. (2) The polyolefin-based splittable conjugate fiber as described in 1 above, wherein the hydrophilic component is at least one selected from the group consisting of fatty acid glyceride, alkoxylated alkylphenol and polyoxyalkylene fatty acid ester. (3) A non-woven fabric made of ultrafine fibers having a fine cross section with a fineness of 0.5 denier or less, which is obtained by dividing the polyolefin-based splittable conjugate fiber described in 1 or 2 above.

The present invention will be described in detail below. The polyolefin resin used for the polyolefin splittable conjugate fiber of the present invention is a homopolymer of ethylene and propylene, and a copolymer with other α-olefin, or a mixture thereof. As the α-olefin copolymer, there is an olefin-based binary copolymer or terpolymer mainly containing propylene. Specific examples of these copolymers include propylene as a main component and a copolymer such as ethylene or butene-1 or 4-methylpentene-1. In addition, depending on the application, a combination or mixture of polyester resin or polyamide resin and polyolefin resin may be appropriately selected without any problem. Of these polyolefin-based resins, at least two or more resins having low compatibility with each other are radially or parallelly or parallelly composite-spun as shown in FIGS. A composite fiber is obtained. Further, those polyolefin-based splittable conjugate fibers can be blended with an additive that imparts other functionality to the fiber within a range that achieves the object of the present invention, and can be selected according to the application and appropriately selected. It can be blended.

The polyolefin-based splittable conjugate fiber of the present invention preferably has a single yarn fineness of 0.5 denier to 6.0 denier. It is more preferably 1.0 to 4.0 denier. When the single yarn fineness is less than 0.5 denier,
When a web is formed by the carding process at the time of processing a non-woven fabric, there is a tendency that a nep is generated, a sink in a cylinder or the like occurs. In another method, that is, a wet method, that is, a web forming method by dispersing fibers in water, a method of less than 0.5 denier often causes poor dispersibility. On the other hand, if it exceeds 6.0 denier, the fineness after division becomes thicker and the wiping performance is poor, which is not preferable. The fineness of the divided ultrafine fibers obtained after the division is preferably 0.02 to 0.50 denier. More preferably, a non-woven fabric having a denier of 0.30 or less can provide a non-woven fabric having excellent wiping properties and flexibility.

The hydrophilic component to be kneaded and added in the present invention is appropriately selected alone from the group of nonionic surfactants such as fatty acid glyceride, alkoxylated alkylphenol, polyoxyalkylene fatty acid ester, and fatty acid amide. Alternatively, it can be used as a mixture. Among them, examples of preferable hydrophilic components evaluated on the basis of thermal stability during spinning, hydrophilicity imparting ability to polyolefin resin, and the like include general formula (I) CH ₂ (OR ₁ ) CH (OR ₂ ) CH
₂ (OR ₃ ) (In the formula, OR ₁ , OR ₂ , and OR ₃ independently represent a hydroxy group or a fatty acid ester group, provided that at least one is a fatty acid ester group.) (II) R-Ph- _{O- (CH 2 CH 2 O)} n -CH 2 CH
₂ OH (In the formula, R is an alkyl group having 1 to 20 carbon atoms, Ph is a phenyl group, and n is a numerical value of 10 to 55.) (III) R- (CH ₂ CH ₂ O) _n —CH ₂ CH ₂ OH (wherein R is a saturated or unsaturated fatty acid ester group, and n is a numerical value of 10 to 55).

In the polyolefin-based splittable conjugate fiber of the present invention, a hydrophilic component may be kneaded into at least one component, and the hydrophilic component may be kneaded and added into all of the multiple components. The kneading addition amount of the hydrophilic component for achieving the object of the present invention is 1.0 to 7.0% by weight in one component, and particularly 2.0 to 6.0.
Weight% is preferable. When the amount of the hydrophilic component added is less than 1.0% by weight, a sufficient effect cannot be obtained when the surface area of the fiber is increased due to separation and division during the carding process, and static electricity is generated, which is not preferable. Further, when it exceeds 7.0% by weight,
In the melt spinning process, the spinnability becomes unstable, which is not preferable. The ratio of the first component and the second component in which the hydrophilic component is kneaded is
An equal amount is preferable, but not limited to this. The ratio of the splittable conjugate fiber of the first component in which the hydrophilic component is kneaded is:
10 to 90% by weight is preferable, more preferably 30 to 7
0% by weight.

The nonwoven fabric of the present invention has a fineness of 0.5 denier or less obtained by splitting splittable conjugate fibers, and has a modified cross-sectional shape. It can be obtained by making the splittable conjugate fiber into a web shape using an opening machine or the like and splitting it using a needle punch, a water needle or the like. Furthermore, the nonwoven fabric of the present invention preferably has a basis weight of 20 to 200 g / m ² , and more preferably 40.
Is about 150 g / m ² . If it deviates from the above range, the strength of the non-woven fabric may be insufficient, the non-uniformity may be insufficient, or the division may be insufficient. The ultrafine fiber nonwoven fabric of the present invention may be a mixed cotton nonwoven fabric of the polyolefin-based splittable conjugate fiber of the present invention and other polyolefin fibers as long as it is applicable to the intended use. The polyolefin-based splittable conjugate fiber of the present invention is split by a high-pressure water stream. For the purpose of the present invention, the division ratio is preferably 80% or more. Especially 85%
The above is preferable from the viewpoint of flexibility and wiping property.
The division state and the division ratio change depending on the water pressure of the high-pressure water stream, the line speed, the number of stages, the distance between the ejection hole and the web, and the like. Therefore, in order to obtain the above-mentioned division ratio of 80% or more, the water pressure may be 60 kg / cm ² or more. It is more preferably 80 kg / cm ² or more.

The ultrafine fiber nonwoven fabric made of ultrafine fibers having a modified cross section of 0.5 denier or less of the present invention finally needs hydrophilicity because the hydrophilic component is kneaded and added into the fibers themselves. In applications, there is no need to perform a hydrophilic treatment such as adhesion of a hydrophilic component as a post-treatment, and when all are made of a polyolefin-based resin, they are excellent in acid resistance and alkali resistance, and therefore more versatile. The ultrafine fiber nonwoven fabric of the present invention can be used for medical and industrial wiping cloths, masks, surgical gowns, packaging cloths, filters, surface materials for sanitary goods, building structure reinforcing fibers, liquid transport membranes, etc. .

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples and Comparative Examples as long as the gist of the present invention is not exceeded. In addition, in each example, the evaluation of the physical properties of the fiber and the evaluation of the nonwoven fabric performance and the like were performed by the following methods. (1) Strength / elongation of yarn: According to the method of JIS L 1069. The test was conducted under the conditions of a test length of 20 mm and a pulling speed of 20 mm / min, and the strength (g / d) and the elongation (%) were obtained. (2) Card passability: Each step was visually evaluated. ◯: Good with no generation of static electricity and no nep. ×: Static electricity is generated and the passability is poor. (3) Dividing ratio: The sample is embedded in wax and cut with a microtome at a right angle to the fiber axis to obtain a sample piece. This is observed with a microscope, and the total cross-sectional area (A) of the divided ultrafine fibers divided and the total cross-sectional area (B) of the undivided splittable conjugate fiber (B) are measured by image processing from the obtained cross-sectional image. It was calculated by the formula. Split rate% = A / (A + B) × 100

(4) Texture: Evaluation was made by touch. ○: Very good. X: Somewhat bad. (5) Hydrophilicity: After leaving the ultrafine fiber non-woven fabric in an incubator at 80 ± 5 ° C for 5 hours, it was cooled to room temperature in a desiccator, and distilled water adjusted to 23 ± 2 ° C in a thermostat water pipette. Then, a total of 20 points were dropped while shifting the position of each drop from the height of 1 cm on the non-woven fabric, and the calculation was performed by the following formula. Hydrophilicity = [Number of water drops absorbed within 30 seconds after dropping / total number of drops (; 20 points)] x 100 (6) Wipeability: A certain amount of oil and distilled water was applied to a flat glass plate and wiped off. The test was conducted. After wiping, the cloudiness of the glass surface was visually observed. Good for wiping off things that have been cleanly wiped of oils and fats (○). One in which oil or water on the glass surface remained and the cloudiness could not be removed was evaluated as poor wiping property (x). The results are shown in Table 1. (7) Fineness The fineness before division was determined by cutting the fiber bundle before cutting into 6 cm, weighing 150 pieces, and conducting 5 tests. The fineness after division was calculated from the number of divisions of the division type composite fiber spinning die used.

Example 1 Polypropylene of MFR30 (g / 10 minutes, 230 ° C.) was used as the first component, and MFR25 (g / 10 minutes, 190 ° C.)
High-density polyethylene with ethoxylated alkylphenol and mixed glycerides (ICI, trade name Atoma-68
5) is added to the resin as a second component, and a splitting type composite fiber spinning die is used, and the volume ratio of the first component to the second component is 5: 5. A splittable conjugate fiber was obtained. The splittable conjugate fiber was drawn at a draw ratio of 6.0 times and then crimped with a crimper to a crimping number of about 17 threads / inch to give an alkyl phosphate as a fiber finishing agent.
Tok K salt was attached at 0.3% by weight and then cut. Single yarn fineness 2.0 denier, fiber length 45 mm, strength 4.2 g / d,
A staple fiber having an elongation of 38% was obtained. The staple fiber thus obtained was subjected to a carding process to form a web, and then a nonwoven fabric was processed at a high water pressure of 80 kg / cm ² . The evaluation results are shown in Table 1.

Example 2 Polypropylene of MFR30 (g / 10 minutes, 230 ° C.) was used as the first component, and MFR20 (g / 10 minutes, 190 ° C.)
2% by weight of the same linear hydrophilic low density polyethylene as the hydrophilic component added in Example 1 was kneaded and added to
Using a splittable conjugate fiber spinning die as a component, a splittable conjugate fiber having a cross section of FIG. 1 in which the volume ratio of the first component to the second component was 5: 5 was obtained. This splittable conjugate fiber was drawn at a draw ratio of 4.0 times and then crimped to a crimp number of about 17 peaks /
The bowl was crimped, and 0.3% by weight of an alkyl phosphate K salt as a fiber finishing agent was adhered thereto and then cut. Single yarn fineness 1.3 denier, fiber length 45 mm, strength 3.5 g /
A staple fiber having d and an elongation of 38% was obtained. The staple fiber thus obtained was subjected to a carding process to form a web, and then a nonwoven fabric was processed at a high water pressure of 80 kg / cm ² . The evaluation results are shown in Table 1.

Example 3 Polypropylene of MFR30 (g / 10 minutes, 230 ° C) was used as the first component, and MFR25 (g / 10 minutes, 190 ° C).
The second component is obtained by kneading and adding 6% by weight of a component similar to the hydrophilic component added in Example 1 to the high-density polyethylene of Example 1 and using a splitting type composite fiber spinning die. A splittable conjugate fiber having a cross-section of FIG. 1 having a volume ratio of 5: 5 was obtained. The splittable conjugate fiber was drawn at a draw ratio of 6.0 times and then crimped with a crimper to a crimping number of about 17 threads / inch to give an alkyl phosphate as a fiber finishing agent.
Tok K salt was attached at 0.3% by weight and then cut. Single yarn fineness 2.0 denier, fiber length 45 mm, strength 3.8 g / d,
A staple fiber having an elongation of 45% was obtained. The staple fiber thus obtained was subjected to a carding process to form a web, and then a nonwoven fabric was processed at a high water pressure of 80 kg / cm ² . The evaluation results are shown in Table 1.

Example 4 MFR30 (g / 10 min, 230 ° C.) polypropylene was used as the first component, and MFR25 (g / 10 min, 190 ° C.)
The second component is obtained by kneading and adding 6% by weight of a component similar to the hydrophilic component added in Example 1 to the high-density polyethylene of Example 1 and using a splitting type composite fiber spinning die. A splittable conjugate fiber having a cross-section of FIG. 1 having a volume ratio of 5: 5 was obtained. The splittable conjugate fiber was drawn at a draw ratio of 6.0 times and then crimped with a crimper to a crimping number of about 17 threads / inch to give an alkyl phosphate as a fiber finishing agent.
Tok K salt was attached at 0.3% by weight and then cut. Single yarn fineness 6.0 denier, fiber length 51 mm, strength 3.5 g / d,
A staple fiber having an elongation of 55% was obtained. The staple fiber thus obtained was subjected to a carding process to form a web, and then a nonwoven fabric was processed at a high water pressure of 80 kg / cm ² . The evaluation results are shown in Table 1.

Example 5 Polypropylene of MFR30 (g / 10 minutes, 230 ° C) was used as the first component, and MFR25 (g / 10 minutes, 190 ° C).
The second component is obtained by kneading 7% by weight of a component similar to the hydrophilic component added in Example 1 to the high-density polyethylene of Example 1 and using a splitting type composite fiber spinning die as a first component and a second component. A splittable conjugate fiber having a cross-section of FIG. 1 having a volume ratio of 5: 5 was obtained. The splittable conjugate fiber was drawn at a draw ratio of 6.0 times and then crimped with a crimper to a crimping number of about 17 threads / inch to give an alkyl phosphate as a fiber finishing agent.
Tok K salt was attached at 0.3% by weight and then cut. Single yarn fineness 2.0 denier, fiber length 45 mm, strength 3.6 g / d,
A staple fiber having an elongation of 32% was obtained. The staple fiber thus obtained was subjected to a carding process to form a web, and then a nonwoven fabric was processed at a high water pressure of 80 kg / cm ² . The evaluation results are shown in Table 1.

Example 6 3% by weight of the same component as the hydrophilic component added in Example 1 was added to polypropylene of MFR30 (g / 10 minutes, 230 ° C.).
The kneaded and added product is used as the first component, and MFR25 (g / g
(10 minutes, 190 ° C.) High-density polyethylene (3% by weight) similar to the hydrophilic component added in Example 1 was kneaded and added as the second component, and the split type composite fiber spinning die was used to The volume ratio of the first component to the second component is 5: 5 in FIG.
A splittable conjugate fiber having a cross section of was obtained. The splittable conjugate fiber was drawn at a draw ratio of 5.0 times and then crimped with a crimper to a crimping number of about 17 threads / inch, and 0.3 weight of an alkyl phosphate K salt was used as a fiber finishing agent. % After adhering, cut. A staple fiber having a single yarn fineness of 2.0 denier, a fiber length of 51 mm, a strength of 3.5 g / d and an elongation of 45% was obtained. The staple fiber thus obtained was subjected to a carding process to form a web, and then a nonwoven fabric was processed at a high water pressure of 80 kg / cm ² . The evaluation results are shown in Table 1.

Working Examples 7 and 8 The web obtained in Working Example 3 was processed with a water pressure of 80 kg / cm 2.
The number of processing steps was changed to 2 steps and 3 steps respectively, and non-woven fabric processing was performed. The evaluation results are shown in Table 1.

Comparative Example 1 MFR30 (g / 10 minutes, 230 ° C.) polypropylene was used as the first component, and MFR25 (g / 10 minutes, 190 ° C.).
The high-density polyethylene as the second component is used as the second component, and the volume ratio of the first component and the second component is 5 by using the split type composite fiber spinning die.
A splittable conjugate fiber having a cross section of FIG.
The splittable conjugate fiber was drawn at a draw ratio of 6.0 times and then crimped with a crimper to a crimp number of about 17 threads / inch, and 0.3 weight of an alkyl phosphate K salt was used as a fiber finishing agent. %
It cut after adhering. A staple fiber having a single yarn fineness of 2.0 denier, a fiber length of 51 mm, a strength of 4.3 g / d and an elongation of 30% was obtained. Obtained staple fiber
After forming the web in the carding process, 80 kg / c
The nonwoven fabric was processed under a high water pressure of m ² . Table 1 shows the evaluation results.
It was shown to.

Comparative Example 2 MFR30 (g / 10 minutes, 230 ° C.) polypropylene was used as the first component, and MFR25 (g / 10 minutes, 190 ° C.).
The second component is obtained by kneading 0.5% by weight of the same component as the hydrophilic component added in Example 1 into the second high density polyethylene, and using the split type composite fiber spinning die as a first component, A splittable conjugate fiber having a cross section of FIG. 1 in which the volume ratio of the two components was 5: 5 was obtained. The splittable conjugate fiber was drawn at a draw ratio of 6.0 times and then crimped with a crimper to a crimp number of about 17 threads / inch, and 0.3 weight of an alkyl phosphate K salt was used as a fiber finishing agent. % After adhering, cut. Single yarn fineness 2.0 denier, fiber length 45 mm, strength 4.0 g /
d, a staple fiber having an elongation of 32% was obtained. The staple fiber thus obtained was subjected to a carding process to form a web, and then a nonwoven fabric was processed at a high water pressure of 80 kg / cm ² . The evaluation results are shown in Table 1.

Comparative Example 3 MFR30 (g / 10 minutes, 230 ° C.) polypropylene was used as the first component, and MFR25 (g / 10 minutes, 190 ° C.).
The second component was prepared by kneading 9% by weight of a component similar to the hydrophilic component added in Example 1 to the high-density polyethylene described above, and was spun using a splitting type composite fiber spinning die. Not stable. No sample was obtained.

Comparative Example 4 MFR10 (g / 10 min, 230 ° C.) polypropylene was used as the first component, and MFR25 (g / 10 min, 190 ° C.)
The second component is obtained by kneading and adding 6% by weight of a component similar to the hydrophilic component added in Example 1 to the high-density polyethylene of Example 1 and using a sheath-core type composite fiber spinning die as a first component and a second component. A sheath-core type composite fiber having a sheath-core type cross section in which the volume ratio of the components was 5: 5 was obtained. This composite fiber is stretched at a draw ratio of 4.0.
After being stretched at twice, crimping was applied to a crimp number of about 17 ridges / inch to deposit 0.3% by weight of alkyl phosphate K salt as a fiber finishing agent and then cut. Single yarn fineness 2.0
Denier, fiber length 45 mm, strength 3.2 g / d, elongation 7
7% staple fiber was obtained. After forming a web in the carding process of the obtained staple fiber,
The nonwoven fabric was processed at a high water pressure of 80 kg / cm ² . The evaluation results are shown in Table 1.

Comparative Example 5 The staple fiber obtained in Comparative Example 1 was subjected to a carding process to form a web, and the number of processing steps was changed to ^{2 by} a high water pressure of 80 kg / cm ² to obtain a nonwoven fabric. Processed. The evaluation results are shown in Table 1.

[0037]

EFFECTS OF THE INVENTION The polyolefin-based splittable conjugate fiber of the present invention has a component in which a hydrophilic component is kneaded, and maintains the hydrophilic effect, so that splitting and peeling during carding are small and card workability is low. Was good. The polyolefin-based splittable conjugate fiber of the present invention suppresses the generation of static electricity by bleeding out the kneaded hydrophilic component even if splitting or peeling occurs to some extent during the card treatment and splitting occurs. The card passage property was improved without the occurrence of nep. The polyolefin-based splittable conjugate fiber of the present invention has a hydrophilic component kneaded and added to the fiber itself, so that even if the hydrophilic surfactant adhering to the fiber surface as a fiber finishing agent is washed off, A hydrophilic component appeared. The polyolefin-based splittable conjugate fiber of the present invention causes less splitting and peeling during carding, and retains a hydrophilic effect even in processing by a high-pressure water stream, so-called water nidle processing, so it should be watered. Maintaining the wet condition of the pretreatment before processing without becoming bulky, the splitting rate was significantly improved in processing by high pressure water flow. Furthermore, the polyolefin-based splittable conjugate fiber of the present invention has a hydrophilic component that appears at the separated and separated interface, so that the wettability is improved, and the fiber does not avoid the flow of water even when the non-woven fabric is repeatedly processed by high-pressure water flow. It became easier to receive the impact energy of water evenly, and an ultrafine fiber nonwoven fabric was obtained which was sufficiently evenly divided with a small number of steps.

Since the polyolefin-based splittable conjugate fiber of the present invention has improved card-passing properties, it retains a hydrophilic effect even in processing by a high-pressure water stream, so-called water nidle processing, so that it does not generate water. The wettability of the pretreatment before processing was maintained without becoming bulky, and the splitting rate was significantly improved during processing by high-pressure water flow. The nonwoven fabric composed of the ultrafine fibers of the present invention has a small amount of undivided composite fibers, the ultrafine fibers are uniformly dispersed and entangled with each other, and the hydrophilicity is kneaded into the nonwoven fabric, which is soft and hydrophilic. It was The non-woven fabric made of the ultrafine fibers of the present invention is an ultrafine fiber having a modified cross section made of a polyolefin-based resin in which a hydrophilic component is kneaded,
At the same time as wiping off greasy dirt, it was easy to wipe off water component dirt.

[0039]

[Table 1]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a splittable conjugate fiber of the present invention.

FIG. 2 is a cross-sectional view of the splittable conjugate fiber of the present invention.

FIG. 3 is a cross-sectional view of the splittable conjugate fiber of the present invention.

FIG. 4 is a cross-sectional view of the splittable conjugate fiber of the present invention.

FIG. 5 is a cross-sectional view of the splittable conjugate fiber of the present invention.

Claims (3)

[Claims] 1. A splittable conjugate fiber mainly composed of a polyolefin resin, wherein a hydrophilic component is kneaded and added to at least one component in an amount of 1.0 to 7.0% by weight. 2. The polyolefin-based splittable conjugate fiber according to claim 1, wherein the hydrophilic component is at least one selected from the group consisting of fatty acid glyceride, alkoxylated alkylphenol and polyoxyalkylene fatty acid ester. 3. A non-woven fabric comprising fine fibers having a fineness of 0.5 denier or less obtained by dividing the polyolefin-based splittable conjugate fiber according to claim 1 or 2 and having an irregular cross-sectional shape.