TW201945457A - Non-woven fabric of crimped composite fiber and laminate thereof, and article including the laminate - Google Patents

Abstract

There is provided a non-woven fabric of a crimped composite fiber including: a first propylene-based polymer and a second propylene-based polymer, wherein, in the first propylene-based polymer and the second propylene-based polymer, a melting point of the first propylene-based polymer is higher than a melting point of the second propylene-based polymer by 30 DEG C or more, a ratio (second polymer/first polymer) of melt flow rates (MFR: measurement temperature 230 DEG C, load 2.16 kg) of the first propylene-based polymer and the second propylene-based polymer is 1.7 or more, and a component ratio represented by a weight ratio of the first propylene-based polymer/the second propylene-based polymer is 50/50 to 10/90.

Description

Non-woven fabric with crimped composite fibers and laminates thereof, and articles containing the same

One or more embodiments relate to a non-woven fabric of crimped composite fibers and a laminate thereof, and an article containing the same, and more particularly to a non-woven fabric of crimped composite fibers having improved softness and bulkiness, and to Laminates and articles containing the laminates.

The final physical properties of a non-woven fabric are determined according to a mesh forming method and a bonding method.

In the production of a conventional spunbond nonwoven fabric, a mesh is formed by single spinning or core-sheath composite spinning. The mesh formed in this way has a simple structure without curling, and is bonded to each other by a heating calender to form a thin non-woven fabric.

During the production of a diaper, a thin nonwoven fabric is used as a topsheet and a backsheet. However, compared with a short-fiber breathable nonwoven fabric obtained by forming a mesh through carding and bonding the mesh through hot air, the thin nonwoven fabric has very low softness, and thus the softness of the thin nonwoven fabric is deteriorated.

In addition, since the curl is not formed when the mesh is formed during the production of a diaper, and the bulkiness is deteriorated, an area directly contacting a baby's buttocks skin is large, and when the nonwoven fabric is laminated, the distribution layer (ADL There is no space between them so that when a baby urinates, urine remains in a part of the top sheet, thereby festering on the baby's buttocks or causing a rash. In addition, there is a problem that urine leaks to the outside of a diaper.

One or more embodiments provide a nonwoven fabric of crimped composite fibers having improved softness and bulk.

One or more embodiments provide a nonwoven laminate comprising two or more nonwovens of crimped composite fibers.

One or more embodiments provide an article comprising a nonwoven laminate.

Additional aspects will be set forth in part in the description below, and will be partly obvious from the description, or can be learned by practicing the presented embodiments.

According to one or more embodiments, a nonwoven fabric of crimped composite fibers includes: a first propylene-based polymer and a second propylene-based polymer, wherein in the first propylene-based polymer and the second propylene-based polymer, A melting point of one of the first propylene-based polymers is 30 ° C. or more higher than a melting point of one of the second propylene-based polymers. The melting points are measured by a differential scanning thermal analysis (DSC). One of the melt flow rate (MFR: measurement temperature 230 ° C, load 2.16 kg) of the second polymer and the second propylene polymer (the second polymer / the first polymer) is 1.7 or more, such The melt flow rate is measured according to ASTM D1238 and a component ratio of 50/50 to 10/90 is represented by a weight ratio of the first propylene polymer / the second propylene polymer.

The first propylene-based polymer and the second propylene-based polymer may each independently include a propylene homopolymer, a propylene-ethylene copolymer, an elastic random copolymer in which ethylene and polypropylene are copolymerized, and propylene-ethylene-butene Terpolymer or a combination thereof.

The non-woven fabric may further include fatty acid ammonium having 5 to 25 carbon atoms in an amount of about 0.01 wt% to about 3 wt% based on the total weight of one of the non-woven fabrics.

The non-woven fabric may include an embossed portion and a non-embossed portion, and the embossed portion may be an open embossed portion and include a plurality of unit embossed pattern portions arranged continuously at the same or different intervals.

As shown in FIG. 4, each of the embossed pattern portions of the units is arranged around a square opening, is placed in the same orientation at the bottom right periphery and the top left periphery of the embossed portion, and is disposed in another orientation The bottom left periphery and the top right periphery of the embossed portion.

Each of the embossed patterns included in each of the unit embossed pattern portions may have an area of about 0.2 mm ² to about 0.7 mm ² .

The non-woven fabric may have an adhesion rate of 13% or less.

The crimped composite fiber may be a single type composite fiber, a core-sheath type composite fiber, a side-by-side type composite fiber, or a sandwich type composite fiber.

The nonwoven fabric may be a spunbond nonwoven fabric.

According to one or more embodiments, a nonwoven fabric laminate has at least two layers, wherein at least one layer of the laminate is a nonwoven fabric of crimped composite fibers.

The nonwoven fabric may be a spunbond nonwoven fabric, and the nonwoven fabric laminate may be formed by laminating four spunbond nonwoven fabrics with a uniformity (CV) of 3% or less.

The non-woven laminate may have a thickness of 0.02 mm or more, a number of curls of 10 EA / 10 mm or more, and a adhesion rate of 13% or less, and in an adhesion area of each embossed pattern Has a machine direction (MD) stiffness of 50 mm or less.

According to one or more embodiments, an article includes the nonwoven laminate.

The article may be a diaper, an absorbent article, a defecation article, a support layer, or a topsheet.

When the article is a diaper, the nonwoven laminate may have a hydrophilic agent impregnation amount (OPU) of 0.7% or less, and therefore when the nonwoven laminate is applied to a topsheet layer of the diaper, The item may have a water absorption speed of 3 seconds or less.

Cross-References to Related Applications This application claims the benefit of Korean Patent Application No. 10-2018-0044536, filed with the Korean Intellectual Property Office on April 17, 2018. The full disclosure of this case is incorporated by reference In this article.

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like-element symbols are used to refer to like-elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below with reference to the drawings to explain aspects of the present description. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Expressions before a component list (such as "at least one") modify the entire component list without modifying individual components of the list.

Hereinafter, a nonwoven fabric, which is one of the crimped composite fibers according to an embodiment, will be described in detail.

The nonwoven fabric of the crimped composite fiber (hereinafter, simply referred to as "composite fiber") according to an embodiment includes a first propylene-based polymer and a second propylene-based polymer.

In the first propylene-based polymer and the second propylene-based polymer, (i) one of the first propylene-based polymers has a melting point 30 ° C or more higher than the melting point of one of the second propylene-based polymers. Measured by differential scanning thermal analysis (DSC), (ii) one of the ratios of the melt flow rates (MFR: measurement temperature 230 ° C, load 2.16 kg) of the first propylene-based polymer and the second propylene-based polymer ( The second polymer / the first polymer) is 1.7 or more, and the melt flow rates are measured according to ASTM D1238, and (iii) the weight of one of the first propylene polymer / the second propylene polymer Ratio means that one component ratio is 50/50 to 10/90.

For example, the melting point of the first propylene-based polymer may be about 30 ° C to about 60 ° C or about 30 ° C to about 100 ° C higher than the melting point of the second propylene-based polymer.

For example, the melt flow ratio (second polymer / first polymer) may be from about 1.7 to about 2.0, from about 1.7 to about 3.0, or from about 1.7 to about 4.0.

When the first propylene-based polymer and the second propylene-based polymer satisfy all of the above conditions (i) to (iii), the composite fiber has crimpability, and therefore the nonwoven fabric including the composite fiber may have good softness and bulk.

The first propylene-based polymer and the second propylene-based polymer are configured to occupy substantially respective regions in a cross section of the composite fiber, and are continuously stretched in a length direction. At least one component of the first propylene-based polymer and the second propylene-based polymer may continuously form at least a portion of a peripheral surface along the length direction of the composite fiber.

The first propylene-based polymer and the second propylene-based polymer may each independently include a propylene homopolymer, a propylene-ethylene random copolymer, an elastic random copolymer in which ethylene and polypropylene are copolymerized, and propylene-ethylene-butene Terpolymer or a combination thereof.

The propylene-ethylene random copolymer may have an ethylene unit component content of about 10 mol% to about 30 mol% and a melt flow rate (MFR) of about 10 g / 10 min to about 200 g / 10 min. The content of the ethylene unit component was determined by ¹³ C-NMR spectroscopy.

For example, the elastic random copolymer may be contained in the first propylene-based polymer in an amount of about 10 wt% to about 30 wt%.

As another example, the propylene-ethylene-butene terpolymer may be included in the first propylene-based polymer in an amount of about 10 wt% to about 30 wt%.

As another example, the elastic random copolymer and the propylene-ethylene-butene terpolymer may be included in the first propylene-based polymer in an amount of about 10 wt% to about 30 wt%.

In detail, at least one component of the first propylene-based polymer and the second propylene-based polymer may include a propylene homopolymer; wherein propylene is a main structural unit component and 2 to 20 carbon atoms (for example, 2 To 8 carbon atoms) copolymerized with at least one of α-olefins such as ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and 4-methyl-1-pentene Copolymer; or a combination thereof.

In terms of obtaining a nonwoven fabric with one of the composite fibers having good softness and bulkiness, the first propylene-based polymer may be a propylene homopolymer of 70 wt% to 90 wt% and a random elasticity of 10 wt% to 30 wt% A copolymer or a mixture of one of a propylene-ethylene-butene terpolymer, and the second propylene-based polymer may be a propylene homopolymer.

The melting point of the first propylene-based polymer may be in a range of about 120 ° C to about 175 ° C, and the melting point of the second propylene-based polymer may be in a range of about 110 ° C to about 155 ° C. As described above, the melting point difference between the two polymers may be in a range of 30 ° C or higher, about 30 ° C to about 60 ° C, or about 30 ° C to about 100 ° C.

The aforementioned propylene-based polymer can be prepared using a high stereoregular polymerization catalyst.

The high stereoregular polymerization catalyst may include a diester-based catalyst, a succinate-based catalyst, a metallocene catalyst, or a combination thereof.

The non-woven fabric containing composite fibers can be obtained by a general composite melt spinning method without using a special device. For example, the nonwoven fabric may be a spunbond nonwoven fabric prepared by a spunbond method exhibiting high productivity.

Hereinafter, a method for producing a spunbond nonwoven fabric will be described in detail.

First, two extruders or the like are melted to form a first propylene-based polymer in one area of the composite fiber and a second propylene-based polymer in another area of the composite fiber, respectively, and have a composite spinning One of the nozzles discharges the melt from a spinning nozzle, and the composite spinning nozzle is structurally designed to form and discharge a desired fiber structure to discharge composite long fibers.

Then, the discharged long fibers are cooled by cooling air, a force is applied to the cooled long fibers by air to stretch to allow the long fibers to have a predetermined fineness, and the drawn long fibers are directly collected in A belt is collected and deposited to a predetermined thickness.

Next, after performing as a hybrid treatment by using a needle punch, a water jet, an ultrasonic wave or the like; embossing treatment using a heated embossing roller; or thermal fusion using a hot ventilation air deal with.

In one embodiment of the present invention, a non-woven fabric may be formed by heat melting using an embossing process.

May be performed in one of 13% or less of adhesive (i.e., embossed area ratio) and 0.2 mm ² or greater (e.g., about 0.2 mm ² to about 0.7 mm ²⁾ under conditions of non-embossed unit area one Embossing. Here, the non-embossed unit area refers to a largest area of a rectangle that contacts the inside of one of the smallest units of one of the smallest units of the non-embossed portion surrounded by the embossed portion on all sides. When the embossing treatment is performed under the conditions in this range, a nonwoven fabric having better bulkiness while maintaining the necessary strength can be obtained.

The adhesion rate and non-embossed unit area can be adjusted by changing an embossing pattern.

As a result of the embossing process, the non-woven fabric may include an embossed portion and a non-embossed portion, and the embossed portion may be an open embossed portion and include a plurality of unit embossed pattern portions arranged continuously at the same or different intervals. Please refer to FIG. 4, each of the embossed pattern portions of the unit is arranged around a square opening 12 and is placed in the same orientation at the bottom right periphery 11 and the top left periphery 11 of the embossed portion, and in the other orientation at the bottom left Perimeter 11 and top right perimeter 11.

The fineness and basis weight of the non-woven fabric may be appropriately selected depending on the use. Generally, the fineness of the non-woven fabric may be about 1.0 denier to about 2.5 denier, for example, about 0.7 denier to about 2.0 denier, and the basic weight of the non-woven cloth may be about 15 g / m ² to about 100 g / m ² , For example, about 7 g / m ² to about 30 g / m ² .

Each of the embossed patterns included in each of the unit embossed pattern portions may have an area of about 0.2 mm ² to about 0.7 mm ² .

The non-woven fabric further comprises fatty acid amidine having 5 to 25 carbon atoms in an amount of about 0.01 wt% to about 3 wt% based on the total weight of one of the non-woven fabrics.

Fatty acid amidine can be used as a lubricant.

The fatty acid amide may include oleamide, erucamide, eramine stearate, or a combination thereof.

In addition to the first propylene-based polymer and the second propylene-based polymer, the composite fiber may contain other components as needed, as long as one of the objects of the present invention is not impaired. Examples of other components may include a thermal stabilizer, a weathering stabilizer, various stabilizers, an antistatic agent, an anti-blocking agent, an anti-fogging agent, a filler, a dye, a pigment, a natural oil, a synthetic oil , Wax and combinations thereof.

The stabilizer may include an anti-aging agent such as 2,6-di-third-butyl-4-methylphenol (BHT); a phenolic antioxidant such as tetrakis [methylene-3- (3,5-di -Third-butyl-4-hydroxyphenyl) propionate] methane, β- (3,5-di-third-butyl-4-hydroxyphenyl) propionic acid alkyl ester, or 2,2'-grass Ammonium bis [ethyl-3- (3,5-di-third-butyl-4-hydroxyphenyl) propionate; fatty acid metal salts such as zinc stearate, calcium stearate or 1,2- Hydroxy calcium stearate; polyhydric alcohol fatty acid esters such as glyceryl monostearate, glyceryl distearate, pentaerythritol monostearate, pentaerythritol distearate or pentaerythritol tristearate; or And other combinations.

Fillers can include silica, diatomaceous earth, alumina, titania, magnesia, pumice powder, pumice balls, aluminum hydroxide, magnesium hydroxide, alkaline magnesium carbonate, dolomite, calcium sulfate, potassium titanate, sulfuric acid Barium, calcium sulfite, talc, clay, mica, asbestos, calcium silicate, montmorillonite, bentonite, graphite, aluminum powder, molybdenum sulfide, or a combination thereof.

The aforementioned propylene-based polymer and the aforementioned other components to be used as necessary may be mixed by a known method.

The composite fiber may be a single type composite fiber, a core-sheath type composite fiber, a side-by-side type composite fiber, or a sandwich type composite fiber.

Hereinafter, a nonwoven fabric laminate according to one embodiment of the present invention will be described in detail.

The nonwoven laminate according to one embodiment of the present invention may be a laminate having at least two layers. Here, at least one layer of the laminate may be the aforementioned non-woven fabric.

The nonwoven laminate may include one of the aforementioned nonwovens, a spunbond nonwoven.

A nonwoven laminate can be formed by laminating four spunbond nonwovens. In this case, the nonwoven fabric laminate may have a uniformity (CV) of 3% or less. In this specification, "uniformity (CV%)" refers to dividing the weight deviation of one of the 30 test samples by 30 test samples after cutting the nonwoven fabric laminate to a size of 1 m ² to make 30 test samples. One average weight obtained as one percentage of one value.

A nonwoven fabric laminate formed by laminating four spunbond nonwoven fabrics may have a thickness of 0.02 mm or more, a number of curls of 10 EA / 10 mm or more, and a adhesion rate of 13% or less, And it may have a longitudinal (MD) stiffness of 40 mm or less, which indicates the softness of the nonwoven laminate. In this specification, "MD stiffness" refers to the flexural deformation (i.e., the degree of warpage of the nonwoven laminate) of the nonwoven laminate in a longitudinal direction.

Hereinafter, an article according to an embodiment of the present invention will be described in detail.

An article according to an embodiment of the present invention includes the aforementioned nonwoven fabric laminate.

The article may be a diaper, an absorbent article, a defecation article, a support layer, or a topsheet.

When the article is a diaper, the nonwoven laminate has a hydrophilic agent impregnation amount (OPU: Oil Pick-UP) of 0.7% or less, and therefore when the nonwoven laminate is applied to one of the diapers When sheeted, the article may have a water absorption speed of one or three seconds.

The amount of hydrophilic agent impregnation (OPU) can be calculated according to Equation 1 below.
[Equation 1]
OPU (%) = (W1-W0) / W0x100

In Equation 1, W0 is one weight of the non-woven fabric laminate containing no hydrophilic agent, and W1 is one weight of the non-woven fabric laminate containing hydrophilic agent. In the dipping procedure, the hydrophilic agent was used as a form of an aqueous suspension of polydimethylsiloxane with a concentration of 15 wt%. However, in Equation 1, the weight of the hydrophilic agent contained in the nonwoven fabric laminate refers only to the weight of the solid component.

Hereinafter, the present invention will be described in more detail through examples. The following examples are set forth to describe the present invention in more detail, and the scope of the present invention is not limited to these examples.
Examples 1 to 6 and Comparative Examples 1 to 5

One of the first propylene-based polymers (A) containing erucamide slip agent and one of the second propylene-based polymers (B) containing erucamide slip agent were subjected to composite melt-spinning by a spunbond method. The side-by-side composite fibers having the structure of FIG. 2 were deposited on a collection surface, and the composite fibers were subjected to borrowing by using a calender roll (the upper portion of which was heated to 146 ° C and the lower portion of which was heated to 144 ° C). An embossing process is performed from the embossing pattern shown in FIG. 1 to produce a non-woven fabric containing crimped composite fibers. The type, physical properties, and content ratio of the first propylene polymer (A) and the second propylene polymer (B), the amount of erucamide slip agent, and the characteristics of the embossed pattern are given in Table 1 below. In the table, MFR refers to a melting index measured according to ASTM D1238 at a temperature of 230 ° C and a load of 2.16 kg, and the slip amount refers to a weight relative to the total weight of the non-woven fabric.


[Table 1]

In Table 1, PA1 to PA7 and PB are as follows.
(1) PA1: a mixture of 70 wt% propylene homopolymer (H7700, manufactured by LG Chem.) And 30 wt% elastic random copolymer (T-7700, manufactured by LG Chem.), Wherein ethylene and Polypropylene copolymer
(2) PA2: a mixture of 60 wt% propylene homopolymer (H7700, manufactured by LG Chem.) And 40 wt% elastic random copolymer (VISTAMAXX 7020, manufactured by EXXON), in which ethylene is copolymerized with polypropylene
(3) PA3: a mixture of 40 wt% propylene homopolymer (H7700, manufactured by LG Chem.) And 60 wt% elastic random copolymer (VERSIFY 4200, manufactured by DOW), in which ethylene is copolymerized with polypropylene
(4) PA4: a mixture of 70 wt% propylene homopolymer (H7700, manufactured by LG Chem.) And 30 wt% elastic random copolymer (T-7700, manufactured by LG Chem.), Wherein ethylene and Polypropylene copolymer
(5) PA5: a mixture of 70 wt% propylene homopolymer (MH7700, manufactured by LG Chem.) And 30 wt% elastic random copolymer (T-7700, manufactured by LG Chem.), Wherein ethylene and Polypropylene copolymer
(6) PA6: a mixture of 60 wt% propylene homopolymer (MH7700, manufactured by LG Chem.) And 40 wt% elastic random copolymer (T-7700, manufactured by LG Chem.), Wherein ethylene and Polypropylene copolymer
(7) PA7: a mixture of 70 wt% propylene homopolymer (H7700, manufactured by LG Chem.) And 30 wt% elastic random copolymer (T-7700, manufactured by LG Chem.), Wherein ethylene and Polypropylene copolymer
(8) PB: propylene homopolymer (H562T, manufactured by PMC)
Evaluation Example 1 : Evaluation of physical properties of spunbond nonwovens

The physical properties of the spunbond nonwoven fabrics prepared in Examples 1 to 6 and Comparative Examples 1 to 5 were evaluated as follows, and the results are given in Table 2 below.

(1) The weight per unit area (weight: g / m ² ) is measured according to ASTM D 3776-1985.

(2) Tensile strength: By using a tensile strength amount according to KSK 0520 under the conditions of a test sample width of 5 cm, an interval between test samples of 10 cm, and a tensile speed of 500 mm / min. The testing device (Instron) performs a tensile test to obtain a maximum tensile load.

(3) Anti-stretch elongation: When the nonwoven fabric is stretched to the maximum value, the elongation is measured by the method (2) above.

(4) Measure thickness (mm) according to KSK 0506.

(5) Curl number: directly measure the number of filament curls in a range of 10 mm using a microscope.

(6) Spinnability: visually observe filament vibration during melt spinning, and detect polymer dripping through a defect detector.
[Table 2]

Referring to Table 2, it was found that each of the nonwoven fabrics of the crimped composite fibers prepared in Examples 1 to 6 was thick, had a large amount of crimps, and had good or similar characteristics compared to each of the nonwoven fabrics prepared in Comparative Examples 1 to 5. Other physical properties, such as tensile strength (MD: longitudinal), tensile strength (CD: transverse), tensile elongation (MD: longitudinal), tensile elongation (CD: transverse), and spinnability.

FIG. 3 is a partial view showing an embossing pattern of a nonwoven fabric of the crimped composite fiber prepared in Example 4. FIG.

Referring to FIG. 3, it was found that the nonwoven fabric of the crimped composite fiber prepared in Example 4 had a crimp number of about 20/10 mm.
Evaluation Example 2 : Evaluation of physical properties of nonwoven laminates including spunbond nonwovens

The spunbond nonwoven fabrics prepared in Examples 1 to 6 and Comparative Examples 1 to 5 were laminated in four layers to produce a nonwoven fabric laminate. Next, the physical properties of each of the non-woven laminates were evaluated by the following methods, and the results are given in Table 3 below.

(1) Uniformity (CV%) is calculated by dividing the weight deviation of one of the 30 test samples by one of the 30 test samples after cutting the non-woven laminate to a size of 1 m ² to make 30 test samples. Weight is evaluated as a percentage of the value obtained. The smaller the uniformity (CV%) value, the better the uniformity.

(2) Measure thickness (mm) according to KSK 0506.

(3) Number of crimps: The number of filaments in a range of 10 mm was directly measured using a microscope.

(4) Adhesion rate (%) refers to a percentage in which heat is transferred to adhere a portion of the non-woven fabric as a relief portion of an embossing pattern.

(5) MD stiffness (mm): A bending distance when a non-woven laminate sample is brought into contact with an inclined surface is measured by a testing machine having an inclination of 45 °. The smaller the MD stiffness, the better the flexibility.

(6) OPU (oil content) is obtained by calculating the amount of the hydrophilic agent (ie, the solid content) sprayed on the nonwoven fabric laminate as a percentage of the total weight.

(7) Water absorption rate: When artificial urine is dropped on the nonwoven fabric laminate according to EDANA 150.5 (02), the time taken for the artificial urine to pass through the nonwoven fabric laminate is measured by a sensor.
[table 3]

Referring to Table 3, it was found that the crimped composites prepared by laminating examples 1 to 6 were compared with each of the nonwoven fabric laminates produced by laminating the four nonwoven fabrics of the crimped composite fibers prepared in Comparative Examples 1 to 5. Each of the four nonwoven fabrics produced by the nonwoven has a good uniformity of 3% or less, thick, has a large amount of curl, has a small MD stiffness, has an OPU-like, and has a fast Water absorption speed.

As described above, in the nonwoven fabric of the crimped composite fiber according to an embodiment, the crimped shape is clear and the crimped shape stability is good, so that softness and bulkiness can be improved.

Therefore, a non-woven diaper containing crimped composite fibers will not harm a wearer's skin or cause a rash.

It should be understood that the embodiments described herein should be considered only for descriptive purposes and not for limiting purposes. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments.

Although one or more embodiments have been described with reference to the drawings, those of ordinary skill will understand that various changes in form and detail may be made without departing from the spirit and scope of the invention as defined by the scope of the following patent applications.

11‧‧‧Bottom right periphery / Top left periphery / Bottom left periphery / Top right periphery

12‧‧‧ square opening

A‧‧‧The first propylene polymer

B‧‧‧Second propylene polymer

These and / or other aspects will become apparent and easier to understand from the following description of the embodiments made in conjunction with the accompanying drawings, in which:

1 is a partial view showing an embossed pattern of a non-woven fabric of a crimped composite fiber according to an embodiment of the present invention;

2 is a cross-sectional view of a crimped composite fiber used in the examples and comparative examples;

3 is a partial view showing a non-woven fabric and an embossing pattern of the crimped composite fiber prepared in Example 4; and

FIG. 4 is a single unit view showing an embossing pattern for one of each of the unit embossing pattern portions.

Claims (15)

A non-woven fabric of crimped composite fibers, comprising: A first propylene-based polymer and a second propylene-based polymer, Wherein in the first propylene-based polymer and the second propylene-based polymer, a melting point of one of the first propylene-based polymer is 30 ° C. or more higher than a melting point of the second propylene-based polymer, and the melting points are Measured by differential scanning thermal analysis (DSC), one of the melt flow rates (MFR: measurement temperature 230 ° C, load 2.16 kg) of the first propylene polymer and the second propylene polymer (Second polymer / first polymer) is 1.7 or greater, and the melt flow rates are measured according to ASTM D1238, and are determined by weight of one of the first propylene polymer / the second propylene polymer Ratio means that one component ratio is 50/50 to 10/90. If a non-woven fabric with crimped composite fibers as described in claim 1, The first propylene polymer and the second propylene polymer each independently include a propylene homopolymer, a propylene-ethylene copolymer, an elastic random copolymer in which ethylene and polypropylene are copolymerized, and propylene-ethylene-butene. Terpolymer, or a combination thereof. If a non-woven fabric with crimped composite fibers as described in claim 1, The non-woven fabric further comprises fatty acid amidine having 5 to 25 carbon atoms in an amount of about 0.01 wt% to about 3 wt% based on the total weight of one of the non-woven fabrics. If a non-woven fabric with crimped composite fibers as described in claim 1, The non-woven fabric includes an embossed portion and a non-embossed portion, and The embossed portion is an open embossed portion and includes a plurality of unit embossed pattern portions arranged continuously at the same or different intervals. If a non-woven fabric with crimped composite fibers as described in claim 4, Each of the embossed pattern portions of the units is arranged around a square opening, and is arranged in the same orientation at the bottom right periphery and the top left periphery of the embossed portion, and in the other orientation at the bottom left periphery and Top right perimeter. The non-woven fabric of the crimped composite fiber according to one of the claims 4, wherein each of the embossed patterns contained in the unit embossed pattern portion has an area of about 0.2 mm ² to about 0.7 mm ² . If a non-woven fabric with crimped composite fibers as described in claim 4, The non-woven fabric has an adhesion rate of 13% or less. If a non-woven fabric with crimped composite fibers as described in claim 1, The crimped composite fiber is a single type composite fiber, a core-sheath type composite fiber, a side-by-side type composite fiber, or a sandwich type composite fiber. If a non-woven fabric with crimped composite fibers as described in claim 1, The non-woven fabric is a spunbond non-woven fabric. A non-woven laminate having at least two layers, Wherein at least one layer of the laminate is a non-woven fabric with crimped composite fibers as in any one of claims 1 to 9. If a non-woven laminate of item 10 is requested, The nonwoven fabric is a spunbond nonwoven fabric, and the nonwoven fabric laminate is formed by laminating four spunbond nonwoven fabrics and has a uniformity (CV) of 3% or less. If the nonwoven laminate of item 11 is requested, The non-woven laminate has a thickness of 0.02 mm or more, a number of curls of 10 EA / 10 mm or more, and an adhesion rate of 13% or less, and is in an adhesion area of an embossed pattern. Has a longitudinal (MD) stiffness of 50 mm or less. An article comprising a nonwoven laminate as claimed in any one of claims 10 to 12. If item 13 is requested, The article is a diaper, an absorbent article, a defecation article, a support layer, or a topsheet. If item 14 is requested, Wherein when the article is a diaper, the nonwoven fabric laminate has a hydrophilic agent impregnation amount (OPU) of 0.7% or less, and therefore when the nonwoven fabric laminate is applied to a topsheet layer of the diaper, The item has a water absorption speed of 3 seconds or less.