WO2019093789A1

WO2019093789A1 - Homopolypropylene resin for non-woven fabric and manufacturing method therefor

Info

Publication number: WO2019093789A1
Application number: PCT/KR2018/013548
Authority: WO
Inventors: 박희광; 김병석; 노경섭; 전상진; 채성민
Original assignee: 주식회사 엘지화학
Priority date: 2017-11-08
Filing date: 2018-11-08
Publication date: 2019-05-16

Abstract

The present invention relates to a homopolypropylene resin for a non-woven fabric, and can produce a high-strength non-woven fabric, which is softer than an existing product and does not tear easily due to high toughness, by optimizing tacticity to 80-90%, having a narrow molecular weight distribution of 2.4 or less, and optimizing a modulus through satisfaction of all of a melting index (MI) of 20-30 g/min, a melting point (Tm) of 145°C or lower, and a residual stress rate of 0.05% or less.

Description

[Title of the invention]

Homopolypropylene resin for nonwoven fabric and method for producing the same

TECHNICAL FIELD

Mutual citation with related applications

This application claims the benefit of priority based on Korean Patent Application No. 10-2017- 0148291, dated November 8, 2017, and Korean Patent Application No. 10-2018-0136198, dated November 7, 2018, The entire contents of which are incorporated herein by reference. The present invention relates to a homopolypropylene resin for a nonwoven fabric and a method for producing the same.

BACKGROUND ART [0002]

Generally, a nonwoven fabric is a fabric made by bonding or tangling a fibrous aggregate by a machine or a chemical treatment such as a machine operation or thermal bonding without going through a process of weaving, weaving or knitting. A spun bond, a spun lace, an embossed film wet nonwoven fabric, and the like. In the discussion, it means that the contacts of the web overlapping with the random are bonded to the resin by the resin and used as the wick. Also known as bonded fabrics and bonded fabrics. Such a nonwoven fabric may be produced by various methods. A needle bonding method, a thermal bonding method, a melt blowing method, a spigot lace method, a stitch bond method, and a spun bond method are known. On the other hand, a spunbond nonwoven fabric made of a polyolefin resin is widely used as a filter, a packaging material, a bedding, a garment, a medical product, a sanitary article, an automobile interior material, a building material and the like because of excellent touch, flexibility, air permeability, have. In particular, polypropylene staple fibers are processed into a thermal bond nonwoven fabric through calendaring or air through bonding due to their unique low melting point and excellent chemical resistance, and they are mainly used as surface materials for sanitary articles such as diapers and sanitary napkins. In Japanese Patent Application Laid-Open No. 2002-235237, a polypropylene heat-sealable nonwoven fabric is prepared by introducing a salicylic acid metal salt as a crystallization inhibitor into a master batch pellet in order to impart soft touch and high tensile strength to a nonwoven fabric, However, the test for spunbond nonwoven fabric differs from that of thermal bond nonwoven fabric through short fibers. The spunbond nonwoven fabric has a higher tensile strength than a single-fiber thermal bond nonwoven fabric, but it is a conventional belief that the soft feel is deteriorated. Further, unlike the homopolypropylene resin produced by the conventional Ziegler-Natta catalyst, the homopolypropylene resin produced by the metallocene catalyst has a narrow molecular weight distribution, so that it is possible to produce a fiber having a small thickness and a uniform thickness, There is an advantage of manufacturing a low basis weight nonwoven fabric. However, the metallocene homopolypropylene resin has a disadvantage in giving a rough texture to the surface of the nonwoven fabric because of low low molecular weight content due to low xylene solubles or a narrow molecular weight distribution. Recently, it has been possible to improve the softness of the fabric by using nonwoven fabrics made of different resins inside and outside of the fibers by using Bi-Co spinning technology using polypropylene and polyethylene as resins, In this case, since the strength is so high that it is not suitable for high-strength nonwoven fabrics, Further, there has been an attempt to blend a polypropylene resin with an elastomeric polymer such as C3 elastomer. In this case, however, softness can be improved, but since it is an expensive resin, There is a disadvantage that it is difficult to apply to an industrial process due to an increase in cost and an economical problem.

DETAILED DESCRIPTION OF THE INVENTION

[Technical Problem] The present invention optimizes the modulus by minimizing both tacticity and molecular weight distribution (MWD), melt index (MI), melting point (Tm) and residual force ratio, A homopolypropylene resin for a nonwoven fabric which can provide both a soft feel to a conventional product and an excellent toughness that is not easily torn by a high strength.

[Technical Solution]

According to an embodiment of the present invention, the tacticity is 80% to 90%, the molecular weight distribution (MTO) is 2.4 or less, the melt index Ml is 20 to 30 g / min, the melting point Tm is 145 ^° C or less and a residual force ratio of about 0.05% or less. The homopolypropylene homopolymer for nonwoven fabric may have a molecular weight distribution (MWD) of 2.1 to 2.4, a melting point (Tm) of 133 ^° C to 143 ^° C, and a tacticity of 82% to 87% And a melt index (Ml) of from 23 g / min to 26 g / min. According to another embodiment of the present invention, there is provided a process for producing a homopolypropylene resin for a nonwoven fabric, which comprises polymerizing propylene in the presence of a catalyst containing only a transition metal compound represented by the following formula / RTI >

[Chemical Formula 1]

In Formula 1,

A is carbon, silicon or germanium,

M is a Group 4 transition metal;

X ¹ and X ² are the same or different and are each independently a halogen, substituted or unsubstituted d- ₂₀ alkyl, substituted or unsubstituted C ₂ - ₂₀ alkenyl, substituted or unsubstituted C ₆ - ₂₀ aryl, nitro, amido, substituted or unsubstituted d- ₂₀ alkyl, substituted or unsubstituted C ₆ - ₂₀ arylamino, a substituted or unsubstituted d-20 alkyl silyl group, a substituted or unsubstituted d-20 alkoxy, or A substituted or unsubstituted sulfonate;

R ¹ and R ⁶ are the same or different from each other, and each independently hydrogen or substituted or unsubstituted d- ₂₀ alkyl;

R ² and R ³ , and R ⁷ and R ⁸ are each connected to each other to form a substituted or unsubstituted C ₆ -

20 form an aliphatic or aromatic ring;

R ⁴ , R ⁵ , R ⁹ and R ¹⁰ are the same or different and each independently represents hydrogen, halogen, substituted or unsubstituted d- ₂₀ alkyl, substituted or unsubstituted C ₂ -C ₂₀ alkenyl, Unsubstituted d-20 alkylsilyl, substituted or unsubstituted silylalkyl, substituted or unsubstituted alkoxysilyl, substituted or unsubstituted d- ₂₀ ether, substituted or unsubstituted d-20 silyl ether, The Alkoxy, substituted or unsubstituted C ₆ - ₂₀ aryl, substituted or unsubstituted C ₇ - ₂₀ alkylaryl, or substituted or unsubstituted C ₇ - ₂₀ aryl-alkyl;

R ¹¹ and R ¹² are the same each other, C ₂ - ₂₀ is alkyl. In one embodiment, the transition metal compound in the formula (1) related to R ² and R ³ and R ⁷ and R ⁸ are respectively connected to each other C ₆ - ₂₀ may be to form an aryl group. The transition metal compound may be represented by the following general formula (1-1).

In Formula 1-1,

A, M, X ¹ , X ² , R ¹ , R ⁴ , R ⁵ , R ⁶ , R ⁹ , R ¹⁰ , R ¹¹ and R ¹² are as defined in Formula 1. In the relevant formula (I) the transition metal compound A may be a silicon, M is zirconium or hafnium may be a, X ¹ and X ² may each be a halogen, R ¹ and R ⁶ are each hydrogen or a straight-chain alkyl d- ₅ one can, R ^4, R ^5, R ^9, and R ¹⁰ may be hydrogen, and R ¹¹ are the same and R ^12, C ₂ - ₄ may be a straight chain alkyl group. The transition metal compound may be one represented by one of the following structural formulas:

In addition, the homopolypropylene may be produced by a continuous bulk-slurry polymerization process. 【Effects of the Invention】

According to the present invention there is provided a metallocene homopolypropylene resin produced under a single catalyst comprising a specific transition metal compound, wherein the tacticity and the molecular weight distribution (MTO), the melt index (Ml), the melting point ) And the residual force ratio as well as the narrow molecular weight distribution, it is possible to optimize the modulus to give a soft touch to the existing product, and to have an excellent toughness that is not torn easily at high strength A nonwoven fabric can be provided.

DETAILED DESCRIPTION OF THE INVENTION

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, homopolypropylene resins for nonwoven fabrics according to specific embodiments of the present invention and methods for producing the same will be described. Prior to that, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. And, The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Also, as used herein, the meaning of "comprising" or "containing" embodies certain features, areas, integers, steps, acts, elements or components, But does not exclude the addition of components. In the present invention, the terms first, second, etc. are used to describe various components, and the terms are used only for the purpose of distinguishing one component from another. Moreover, the terminology used herein is for the purpose of describing exemplary embodiments only and is not intended to be limiting of the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms " comprising, "" comprising, " or " having ", and the like are intended to specify the presence of stated features, But do not preclude the presence or addition of one or more other features, integers, steps, components, or combinations thereof. The present invention is _different. Modifications may be made and may take various forms, and specific embodiments will be illustrated and described in detail below. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Hereinafter, the present invention will be described in more detail. According to an embodiment of the present invention, the tacticity is 80% to 90%, the molecular weight distribution (MffD) is 2.4 or less, the melt index (Ml) is 20 g / min to 30 g / min, a melting point (Tm) of 145 ^° C or less, and a residual force ratio of 0.05% or less. The inventors of the present invention found that the metallocene homopolypropylene resin known in the art for the polypropylene resin used for nonwoven fabrics has a low content of low molecular weight due to low xylene solubles or a narrow molecular weight distribution, It is confirmed that there is a disadvantage in giving rough feel to the surface during the production of the nonwoven fabric. Accordingly, the present inventors have found that, in the course of repeated studies for improving the above problems, the tacticity of the metallocene homopolypropylene resin is optimized to 80% to 90% and the melt index (Ml) g / min, optimizing the melting point (Tm) to below 145 V, optimizing the residual force ratio and the molecular weight distribution to 0.05% or less and 2.4 or less, respectively, to optimize the modulus It was confirmed that a nonwoven fabric having excellent toughness can be produced while exhibiting a soft touch. In particular, when soft nonwoven fabric is manufactured by lowering tacticity by the conventional method, soft properties can be realized, but there is a disadvantage in that the strength of the nonwoven fabric tends to be lowered, It is difficult to stretch one. Accordingly, the present invention includes a homopolypropylene resin obtained by a polymerization process using a single catalyst containing a specific metallocene catalyst, which is not a Ziegler-Natta catalyst, as an active component, thereby lowering tacticity By implementing a low molecular weight distribution of about 2.4 or less, high strength can be achieved at the same time as soft touch. The present invention includes a homopolypropylene resin produced through a reactor-made process using a single catalyst with softness and high strength, which are physical properties in a trade-off relationship. . The homopolypropylene resin according to the present invention can be used for producing a nonwoven fabric and is characterized in that the tacticity of the metallocene homopolypropylene resin is about 80% to about 90%. The tacticity of the homopolypropylene resin can be measured by nuclear magnetic resonance (NMR) analysis, which is about 80% to about 90%, or about 80% to about 80% About 87%, and black can be about 82% to about 87%. Here, the tacticity may be a value measured using nuclear magnetic resonance (NMR). The measurement method of tacticity can be further specified in a test example to be described later. The tacticity of the resin should be about 80% or more from the viewpoint of ensuring excellent toughness in manufacturing the nonwoven fabric, and about 90% or less from the viewpoint of realizing a nonwoven fabric having soft touch . The homopolypropylene resin of the present invention is characterized by having a narrow molecular weight distribution (MWD) of about 2.4 or less with an optimized tacticity range as described above. The homopolypropylene resin may have a molecular weight distribution of about 2.4 or less and black of about 2.0 to about 2.4, or about 2.05 to about 2.4, or about 2.1 to about 2.4. Here, the homopolypropylene resin should have a narrow molecular weight distribution (D) of about 2.4 or less in view of ensuring excellent toughness in the production of nonwoven fabric. The weight average molecular weight (Mw) and the number average molecular weight (Mn) of the homopolypropylene resin are measured by gel permeation chromatography (GPC), and the weight average molecular weight The ratio of molecular weight (Mw / Mn) was calculated. Specifically, a gel permeation chromatography (GPC) apparatus can be measured using a Waters PL-GPC220 instrument and a Polymer Laboratories PLgel MIX-B 300 image length column. The measurement temperature is 160 ^° C, 1,2,4-trichlorobenzene is used as a solvent, and the flow rate is 1 mL / min. Samples of the homopolypropylene resin were each prepared at a concentration of 10 mg / 10 mL, and then supplied in an amount of 200 iiL. Values of Mw and Mn can be derived using a calibration curve formed using a polystyrene standard specimen. The weight average molecular weight of the polystyrene standard specimen is 2000 g / mol, 10000 g / mol, 30000 g / mol, 70000 g / mol, 200000 g / mol, 700000 g / mol, 2000000 g / mol, 10000000 g / mol can be used. Further, the homopolypropylene resin of the present invention has a melt index (Ml) and a melting point (Tm) of 20 to 30 g / min and 145, respectively, together with the optimized tacticity range and narrow molecular weight distribution as described above. C or less. The melt index (MI) of the homopolypropylene resin was measured at 230 ^° C under a load of 2.16 kg according to ASTM D 1238 of the American Society for Testing and Materials (ASTM) 20 to about 30 g / 10 min, or about 20 to about 26 g / 10 min, or about 23 to about 26 g / 10 min. Here, the melt index (MI) should be maintained within the above-mentioned range in terms of securing both the radioactive property and the strength of the nonwoven fabric to an excellent degree. In particular, when the melt index (Ml) is less than about 20 g / 10 min in processing a nonwoven fabric using a resin, there is a problem that the processing pressure is increased and the workability is lowered. If the melt index (MI) exceeds about 30 g / 10 m in, the pressure can be secured during processing, but the strength of the product can not achieve the desired high strength. Further, the melting point (Tm) of the homo-polypropylene resin is about 145 ^° C or less, or about 130 ^° C to about 145 ^° C, or from about 144 ^° C or less, or about 132 ^° C to about 144 ^° C, or from about 143 ^° C or from about 133 ^° C to about 143 ^° C. In particular, when a non-woven fabric is used, it is possible to secure a soft touch, The melting point (Tm) of the homopolypropylene resin should be 145 V or less in terms of preventing degradation of the resin due to the rise. Also, when the melting point (Tm) of the homopolypropylene resin exceeds 145 ^° C, there arises a problem in radioactivity, so that single yarns of the fibers are generated and the percentage of defects can be increased. However, if the melting point (Tm) of the homopolypropylene resin is lowered to 130 ^° C or lower, it may be difficult or the productivity may be lowered. On the other hand, in the present invention, the melting point of the homopolypropylene resin is determined by increasing the temperature of the homopolypropylene resin to 220 ^° C, keeping it at that temperature for 5 minutes, then lowering it to 20 ^° C, To measure the DSC (Di fferent i al Scanning Calorimeter, manufactured by TA Corporation) curve at the top of the curve as the melting point. At this time, the temperature rise and fall rates are respectively 10 ^° C / min, and the melting points are the results measured at the second rise of the temperature. In addition, the homopolypropylene resin has a tacticity as described above, a molecular weight distribution, a melt index, a melting point (Tm) and the like, and has a narrow residual stress ratio of about 0.05%. The residual force ratio may be about 0.05% or less, or about 0.005% to 0.05%, the black is about 0.04% or less, or about 0.006% to 0.04%, the black is about 0.03% or less or about 0.006% to 0.03%. In particular, the residual force ratio can be confirmed by a rheological property test in an environment similar to the nonwoven fabric manufacturing process, and a large strain is applied to the homopolypropylene resin to perform a stress relaxation test ), Which is a value measured according to the following equation (1).

[Equation 1]

Residual force ratio = (RS _! / RSo) 100 In the above formula 1, RSo is a residue ungryeok in said homopolypropylene any time point (to) of less than 0.05 seconds after adding the deformation of 200¾ on resin) in the 235 ^° C, R¾ is the homopolypropylene under 235 ^° C Is the residual force at any point () between 0.05 seconds and 1.50 seconds after applying 200% strain to the resin. . That is, according to an embodiment of the present invention, when the ratio of the residual force according to Equation 1 exceeds 0.05%, the possibility of single yarn is high when performing melt blowing using the polypropylene resin as a raw material, There may arise an increase in the number of users. The residual force ratio should be maintained at 0.05% or less, or 0.04% or less, or 0.03% or less to minimize the single yarns of the fibers in processing the nonwoven fabric. In particular, if the residual force is high, the fiber is radiated in the molten state and is drawn in a semi-molten state through cooling. At this time, if the residual force is high, the property of shrinkage is increased, . In the above formula 1 RSo is homo ^'poly immediately added to the 200% strain in the propylene resin, for under 235 ^° ^C: shows the remaining stress at any one time contains less than 0.05 seconds (to). In the above equation (1), 1? 占 represents the residual force at about 1.5 seconds or less (for example, any point in time between 0.05 seconds and 2.00 seconds) after the to under the same condition as RSo. Specifically, in the above equation (1), t ₀ can be selected from 0. for seconds, black for 0.015 seconds, black for 0.02 seconds, or 0.025 seconds, 0.03 seconds, or 0.035 seconds, or 0.04 seconds or 0.045 seconds. In the above equation 1, 0.05, 0, 0, 0, 0, 0.30, 0.40, or 0.50 second for black, 0.20 second for black, 0.20 second for black, 0.70 second for black, 0.80 second for black, , Black is 0.90 seconds, or 1.00 seconds, or 1.10 seconds, or 1.20 seconds, or 1.30 seconds, black is 1.40 seconds, or 1.50 seconds, or 1.60 seconds, or 1.70 seconds, black is 1.80 seconds, Black can be selected in 2.00 seconds. Preferably, for ease of securing valid data in the measurement of residual stress, it is advantageous that in the above equation 1, to is 0.02 seconds and t is 1.00 seconds.

^

Then, the residual force ratio of the homopolypropylene resin is measured under an environment (for example, 235 ^° C) similar to the process conditions for performing melt-blowing in producing the nonwoven fabric. The temperature of 235 ^° C corresponds to a temperature suitable for completely melting the homopolypropyl resin to perform melt blowing. It is preferable that the molecular weight distribution (MWD) also does not rise as described above and maintains a low range so that the residual force ratio in the homopolypropylene resin of the present invention can be maintained in the optimum range as described above and excellent fiber processability can be ensured Do. As described above, the homopolypropylene resin according to an embodiment of the present invention optimizes both the tacticity and the molecular weight distribution (D), the melt index (Ml), the melting point (Tm), and the residual force ratio When it is used in a nonwoven fabric having a narrow molecular weight distribution characteristic, not only a soft feel is given to the conventional product, but also excellent toughness which is not torn easily with high strength can be realized at the same time. The homopolypropylene resin for a nonwoven fabric according to an embodiment of the present invention having the above physical properties and constitutional characteristics is characterized in that propylene is polymerized in the presence of a single catalyst containing only a transition metal compound represented by the following formula The method comprising the steps of: Accordingly, according to another embodiment of the present invention, there is provided a method for producing a homopolypropylene resin for a nonwoven fabric as described above. [Chemical Formula 1]

In Formula 1,

A is carbon (C), silicon (Si) or germanium (Ge)

M is a Group 4 transition metal;

X ¹ and X ² are the same or different and are each independently a halogen, substituted or unsubstituted d-20 alkyl, substituted or unsubstituted C ₂ - ₂₀ alkenyl, substituted or unsubstituted C ₆ - ₂₀ aryl, nitro, amido, substituted or unsubstituted alkylamino, substituted or unsubstituted C ₆ _{unsubstituted-20} arylamino, a substituted or unsubstituted d- ₂₀ alkyl silyl, substituted or unsubstituted _20-alkoxy, or a substituted or unsubstituted ring d-20 sulfonate;

₂₀ form an aliphatic or aromatic ring;

R ^4, R ^5, R ^9, and R ¹⁰ are each other the same or different, and are each independently hydrogen, halogen, substituted or unsubstituted d-20 alkyl, substituted or unsubstituted C ₂ ring-alkenyl ₂₀ alkenyl, substituted or unsubstituted ₍₂₀ alkylsilyl group, a substituted or unsubstituted d-20 silyl alkyl, substituted or unsubstituted ₍₂₀ alkoxysilyl group, a substituted or unsubstituted d-20 ether, a substituted or unsubstituted silyl ether, a substituted or unsubstituted Transformed Alkoxy, substituted or unsubstituted C ₆ - ₂₀ aryl, substituted or unsubstituted C ₇ - ₂₀ alkylaryl, or substituted or unsubstituted C ₇ - ₂₀ aryl-alkyl;

R ¹¹ and R ¹² are the same each other, C ₂ - ₂₀ is alkyl. Unless defined otherwise herein, the following terms may be defined as follows. The halogen may be fluorine (F), chlorine (Cl), bromine (Br) or iodine (I).

The d-20 alkyl, that is, the alkyl group having 1 to 20 carbon atoms, may be a straight chain, branched chain or cyclic alkyl group. Specifically, the alkyl group having 1 to 20 carbon atoms is preferably a straight chain alkyl group having 1 to 20 carbon atoms; A straight chain alkyl group having 1 to 10 carbon atoms; A straight chain alkyl group having 1 to 5 carbon atoms; Branched or cyclic alkyl group of 3 to 20 carbon atoms; Branched or cyclic alkyl group having 3 to 15 carbon atoms; Or a branched or cyclic alkyl group having 3 to 10 carbon atoms. More specifically, the alkyl group having 1 to 20 carbon atoms is preferably a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an i-butyl group, A neopentyl group, a pentyl group, a neo_pentyl group or a cyclic nucleus group and the like.

Ci-20 alkoxy, that is, an alkoxy group having 1 to 20 carbon atoms means a straight-chain or branched alkyl group (-0 R) having 1 to 20 carbon atoms bonded with oxygen. Specifically, the alkyl group preferably has 1 to 20 carbon atoms, more specifically 1 to 6 carbon atoms. 6 < / RTI > alkoxy groups. Specific examples of the alkoxy group include a methoxy group, an eroxy group, a propoxy group, an enriched group, and a t-enoxy group.

C ₂ -2o alkoxyalkyl, that is, an alkoxyalkyl group having 2 to 20 carbon atoms means a functional group in which an alkoxy group as described above is substituted for a carbon of a linear or branched alkyl group in place of hydrogen. Specifically, the alkoxyalkyl group preferably has 2 to 7 carbon atoms, 20, more specifically an alkoxyalkyl group having 2 to 12 carbon atoms. Specific examples of the alkoxyalkyl group include a methoxymethyl group, a tert-butylmethyl group, a tert-butoxyundecenyl group, a 1-ethoxyethyl group and a 1-methyl-1 -methylcyclohexyl group. C ₂ -2o alkenyl, that is, an alkenyl group having 2 to 20 carbon atoms, may be a straight-chain, branched-chain or cyclic alkenyl group. Specifically, the alkenyl group having 2 to 20 carbon atoms is preferably a straight chain alkenyl group having 2 to 20 carbon atoms, a straight chain alkenyl group having 2 to 10 carbon atoms, a straight chain alkenyl group having 2 to 5 carbon atoms, a branched alkenyl group having 3 to 20 carbon atoms, A branched alkenyl group having 3 to 10 carbon atoms, a cyclic alkenyl group having 5 to 20 carbon atoms, or a cyclic alkenyl group having 5 to 10 carbon atoms. More specifically, the alkenyl group having 2 to 20 carbon atoms may be an ethenyl group, a propenyl group, a butenyl group, a pentenyl group, or a cyclohexenyl group. C ₃ -2 o cycloalkyl, that is, a cycloalkyl group having 3 to 20 carbon atoms,

Cyclic saturated hydrocarbon groups of 3 to 20 of ^means. Specifically, the cycloalkyl group includes a cycloalkyl group having 3 to 6 carbon atoms. Specific examples of the cycloalkyl group include a cyclopropyl group, a cyclobutyl group, and a cyclic nucleus group.

,

C ₆ -2 O aryl, that is, aryl having 6 to 20 carbon atoms may mean monocyclic, bicyclic or tricyclic aromatic hydrocarbon. Specifically, aryl having 6 to 20 carbon atoms may be a phenyl group, a naphthyl group, or an anthracenyl group. .

C ₇ -2o alkyl aryl, i.e., an alkylaryl having 7 to 30 may have at least one hydrogen of the aryl mean a substituent substituted by alkyl. Specifically, the alkylaryl having 7 to 20 carbon atoms is preferably methylphenyl, ethylphenyl, n-propylphenyl, iso-propylphenyl, n-butylphenyl, iso-butylphenyl, tert-butylphenyl or cyclohexylphenyl, and the like. C ₇ -2o aryl, i.e., arylalkyl having 7 to 20 may have at least one hydrogen of the alkyl means a substituent substituted by an aryl group. Specifically, the arylalkyl group having 7 to 20 carbon atoms may be a benzyl group, a phenylpropyl group, a phenyl nucleyl group, or the like.

C ₆ -2 O aryloxy, that is, an aryloxy group having 6 to 20 carbon atoms means an aryl group (0 Ar) bonded with oxygen, wherein the aryl group is as defined above. Specifically, the aryloxy group includes an aryloxy group having 6 to 20 carbon atoms, more specifically 6 to 12 carbon atoms. Specific examples of the aryloxy group include phenoxy and the like. The silyl group refers to a -Si 3 radical induced by a silane, and at least one of the hydrogen atoms in the silyl group may be substituted with various organic groups such as an alkyl group, an alkoxy group and a halogen group. Wherein the alkyl, alkoxy, and halogen groups are as previously defined. A nitro group refers to a -NO ₂ radical having one nitrogen atom and two oxygen atoms bonded together.

Ci-20 sulfonate, that is, a sul fonate group having 1 to 20 carbon atoms means a functional group in which a hydrogen is substituted with an alkyl group in a sulfonic acid group (SO ₃ H), wherein the alkyl group is as defined above. Specifically, the sulfonate group may be - SO ₃ R (wherein R is a straight chain or branched alkyl group having 1 to 20 carbon atoms). An amido group means an amino group bonded to a carbonyl group (C = O). Ci-20 alkylamino, i.e. an alkylamino group having from 1 to 20 carbon atoms, means a functional group in which at least one hydrogen in the amino group (-thymine ₂ ) is substituted with an alkyl group, in which the alkyl group is as defined above. Specifically, the alkylamino group may be -NR ₂ (wherein each R may be a hydrogen atom, or a straight chain or branched alkyl group having 1 to 20 carbon atoms, but not both of R's may be a hydrogen atom).

C ₆ -C 20 arylamino, ie, an arylamino group having 6 to 20 carbon atoms means a functional group in which at least one hydrogen in the amino group (-N═) is substituted with an aryl group, wherein the aryl group is as defined above.

C ₆ -2o aliphatic or aromatic ring, i.e. an aliphatic or aromatic ring of 6 to 20 carbon atoms, means a cycloalkyl or aryl group, wherein the cycloalkyl and aryl groups are as defined above.

Ci-20 silylalkyl, that is, a silylalkyl group having 1 to 20 carbon atoms means a functional group in which at least one hydrogen in the alkyl group is substituted with a silyl group, in which the alkyl group and the silyl group are as defined above. Ci-2o ether, that is, an ether having 1 to 20 carbon atoms means a hydrocarbyl group containing a -O-radical, and at least one of the hydrogen atoms in the ether group may be substituted with various organic groups such as a silyl group. Wherein the silyl group is as defined above. An alkyl idene group is an alkyl group having from the same carbon atom of an alkyl group

Means a divalent aliphatic hydrocarbon group in which two hydrogen atoms have been removed. Specifically, the alkylidene group includes an alkylidene group having 1 to 20 carbon atoms, more specifically 1 to 12 carbon atoms. Specific examples of the alkylidene group include a propane-2-yl idene group and the like. The arylidene group means a bivalent aromatic hydrocarbon group in which two hydrogen atoms have been removed from the same carbon atom of the aryl group. Specifically, the arylidene group includes an allylidene group having 6 to 20 carbon atoms, more specifically 6 to 12 carbon atoms. Specific examples of the arylidene group include phenylidene and the like. The hydrocarbyl group means a monovalent hydrocarbon group of 1 to 60 carbon atoms consisting solely of carbon and hydrogen, regardless of its structure, such as an alkyl group, an aryl group, an alkenyl group, an alkylaryl group, and an arylalkyl group. Unless otherwise defined in the present specification, "a combination thereof" means that two or more functional groups are bonded to each other through a single bond, a double bond (ethylene group), a triple bond (acetylene group), or an alkylene group having 1 to 20 carbon atoms , A methylene group (-c¾-) or an ethylene group (- (¾ (¾-), etc.), or two or more functional groups are condensed and connected. In order to produce a homopolypropylene resin for a nonwoven fabric having good softness and high strength, a single catalyst containing a transition metal compound of the above formula (1) as a single component, which is not a common catalyst used for applications suitable for workability such as injection, In a conventional process, a nonwoven fabric may be produced by mixing two kinds of resins having different characteristics, In there is a resin of one kinds of manufactured in the manufacturing process (reactor-made) half unggi difference that meets the soft and the strength at the same time. The homopolypropylene can be produced through a polymerization process in which propylene is contacted with a catalyst containing a transition metal compound represented by the general formula (1). Further, according to one embodiment of the present invention, the single polymerization of propylene can be carried out under hydrogen gas. At this time, the hydrogen gas may be fed at a level of about 2000 ppm or less, or about 10 ppm to about 2000 ppm, or about 50 ppm to about 1500 ppm, based on the total weight of the propylene. It is possible to control the molecular weight distribution and fluidity of the homopolypropylene resin which is produced while controlling the amount of the hydrogen gas to be used while exhibiting the catalytic activity of the stratified catalyst, and accordingly, a propylene-butene copolymer Can be manufactured. As the transition metal compound used as a catalyst for preparing the homopolypropylene resin, one or more transition metal compound compounds represented by the general formula (1) may be used. In Formula 1, R ² and R ³ and R ⁷ and R ⁸ is C ₆ are coupled to each other - may be to form a ₂₀ aryl. In Formula 1, A may be silicon (Si). In the above formula (1), M may be zirconium (Zr) or hafnium (Hf). In Formula 1, X ¹ and X ² may each be halogen. Specifically

X ¹ and X ² may each be chloro. In the above formula (1), R ¹ and R ⁶ may each be hydrogen or d- ₅ straight chain alkyl, or may be hydrogen or methyl. In Formula 1, R ⁴ , R ⁵ , R ⁹ , and may be hydrogen. In Formula 1, R ¹¹ and R ¹² are the same and may be a C ₂ _-4 straight chain alkyl group.

In the above formula (1), R ¹² may be ethyl or 6- (t-butoxy) -nucleic acid. As the transition metal compound, for example, A in the formula (1) is silicon; M is Zr or Hf; X ¹ and X ² are each halogen; R ¹ and R ⁶ are each hydrogen or methyl; R ² and R ³ and R ⁷ and R ⁸ are respectively connected to each other C ₆ - to form a ₂₀ aryl; R ⁴ , R ⁵ , R ⁹ , and R ¹⁰ are hydrogen; R ¹¹ and R ¹² are the same,

C ₂ -4 straight chain alkyl group can be used. In one specific embodiment, the transition metal compound may be represented by the following general formula (1-1).

In Formula 1-1, A, M, X ¹ , X ² , R ¹ , R ⁴ , R ⁵ , R ⁶ , R ⁹ , R ¹⁰ , R ¹¹ and R ¹² are as defined in Formula 1. The transition metal compound having such a structure can cause a proper steric hindrance to more effectively secure the above-mentioned effect. Wherein the substituents of R ¹¹ and R ¹² of the silicon bridge to increase the solubility in terms of improving the loading efficiency by increasing the solubility, and equal to each other in terms of improving the loading efficiency, C ₂ - may be a _10-alkyl group, more particularly May be a C ₂ _-4 straight chain alkyl group, more particularly each ethyl. When a methyl group is included as a substituent of such a bridge, there is a problem that the solubility in preparing the supported catalyst is poor and the supported semisolid property is deteriorated. Zr and Hf are preferable as Zr and Hf, and Zr is a property of increasing the activity. Hf is a property of raising the melting point (Tm) of the resulting resin by about 2-3 ^° C, Can be applied. Preferably, the transition metal compound may be represented by one of the following structural formulas:

The electrophile metal compound represented by Formula 1 may be synthesized by using known reactions. For a more detailed synthesis method, Reference Examples 1 and 2 described below may be referred to. Meanwhile, the catalyst containing the transition metal compound having the structure of Formula 1 may further include various promoters in terms of improving the activity and the process stability. Such a promoter compound may include at least one compound represented by the following general formula (2) or (3).

(2)

R ⁸ - [Al (R ⁷ ) -O] _m -R ⁹

In Formula 2,

R ⁷ , R ⁸ and R ⁹ are each independently any one of hydrogen, halogen, hydrocarbyl group having 1 to 20 carbon atoms and hydrocarbyl group having 1 to 20 carbon atoms substituted with halogen,

m is an integer of 2 or more,

(3)

^{[LH] + [W (J} ) 4] - or ^{[L] + [W (J} ) 4 r

In the above formula (3)

L is a neutral or cationic Lewis base,

W is a Group 13 element, J is independently a hydrocarbyl group having 1 to 20 carbon atoms; A hydrocarbyloxy group having 1 to 20 carbon atoms; And substituents in which at least one hydrogen atom of these substituents is substituted with at least one substituent selected from halogen, a hydrocarbyloxy group having 1 to 20 carbon atoms and a hydrocarbyl (oxy) silyl group having 1 to 20 carbon atoms. For example, as the promoter in the present invention, various promoters represented by the above formula (2) or (3) may be used. For example, methyl aluminoxane, ethyl aluminoxane, isobutyl aluminoxane, tert-butyl aluminoxane, or a mixture thereof may be used as the cocatalyst of formula (2). As the co-catalyst of the above formula (3), trimethylammonium N, N-dimethylanilinium tetrakis (pentafluorophenyl) borate, N, N-dimethylanilinium 侶 -butyl (pentafluorophenyl) borate, triethylammonium tetrakis Tris (pentafluorophenyl) borate, N, N-dimethylanilinium benzyltris (pentafluorophenyl) borate, N, N-dimethylanilinium tetrakis (4-

(t-butyldimethylsilyl) -2,3,5,6-tetrafluorophenyl) borate, N, N-dimethylanilinium tetrakis (4- (triisopropylsilyl) -2,3,5,6- N, N-dimethyl anilinium pentafluorophenoxy tris (pentafluorophenyl) borate, N, N-dimethyl-2,4,6-trimethylanilinium tetrakis (pentafluorophenyl) borate, ) Borate, trimethylammonium tetrakis (2,3,4,6-tetrafluorophenyl) borate, N, N-dimethylanilinium tetrakis (2,3,4,6-tetrafluorophenyl) borate, dimethyl ammonium tetrakis (pentafluorophenyl) borate, ^'Ν- -Ν- methyl dodecyl methyl tetrakis (pentafluorophenyl) borate, di (dodecyl) ammonium tetrakis (pentafluorophenyl) borate or These compounds can be used. The content of the co-catalyst can be appropriately controlled depending on the physical properties and effects of the desired catalyst and homopolypropylene resin. The catalyst comprising the transition metal compound having the structure of Formula 1 may be used in the form of a supported catalyst in which the transition metal compound of Formula 1 and the promoter of Formula 2 or Formula 3 are supported on the support . As the carrier, a carrier containing a hydroxyl group or a siloxane group on its surface can be used. Specifically, as the carrier, a carrier containing a hydroxyl group or a siloxane group having a large semi-maleic group may be used by drying at a high temperature to remove moisture on the surface. More specifically, as the carrier, silica, alumina, magnesia, or a mixture thereof can be used. The carrier may be one which has been dried in high silver, which are typically Na ₂ O, K ₂ CO _{3 l} BaSO ₄ and Mg (NO ₃ ) ₂ , carbonate, sulfate, and nitrate components. The supported catalyst may be a support formed by sequentially supporting the co-catalyst of Formula 2, the transition metal compound of Formula 1, and the co-catalyst of Formula 3 on the support. The supported catalyst having a structure determined in accordance with such a carrying order can realize high activity and excellent process stability in the production process of homopolypropylene resin. More specifically, the supported catalyst may be a single supported catalyst containing only the transition metal compound represented by Formula 1 as the catalytically active component. The homopolypropylene resin can be produced by a continuous polymerization process, and can be produced, for example, by a continuous solution polymerization process, a continuous bulk polymerization process, a continuous suspension polymerization process, a continuous slurry polymerization process or a continuous emulsion polymerization process Various polymerization processes known as polymerization reactions can be employed. However, a continuous bulk-slurry polymerization process is preferable in order to obtain a homogeneous molecular weight distribution as described above and to produce a homopolypropylene resin suitable for nonwoven fabrics. Specifically, the polymerization reaction may be conducted at a temperature of about 40 to 110 ^° C, or about 50 to 100 ^° C, or about 60 to 90 ^° C. In addition, the pressure of the polymerization process can be performed within a range known in the art of polypropylene resin production, and can be performed, for example, at a pressure of about 1 to 100 kgf / cm ² . By way of example, the propylene feed may be from about 10 kg to about 80 kg, or from about 20 kg to about 65 kg, or from about 30 kg to about 50 kg per hour, Can be performed. Further, in the polymerization reaction, the catalyst may be used in a state in which the catalyst is dissolved or diluted in a solvent such as pentane, nucleic acid, heptane, nonane, decane, toluene, benzene, dichloromethane, chlorobenzene and the like. At this time, by treating the solvent with a small amount of alkylaluminum or the like, a small amount of water or air that can adversely affect the catalyst can be removed in advance. As an example, the catalyst may be used in the form of a mud catalyst mixed with oil and grease, and the content of the catalyst may be from about 10% to about 25%, or from about 12% to about 20% , Or from about 14% to about 18%. As described above, the method for producing a homopolypropylene resin according to another embodiment of the present invention uses a single catalyst containing only a transition metal compound represented by the following formula (1) as a catalytically active component, It has the characteristics of narrow molecular weight distribution while optimizing both tactic and molecular weight distribution (MTO), melt index (Ml), melting point (Tm) and residual force ratio. soft tactile feel as well as excellent toughness which is not torn easily at high strength can be realized at the same time. According to another embodiment of the present invention, there is provided a resin composition for a nonwoven fabric comprising the above homopolypropylene resin, and a nonwoven fabric product prepared using the same. Specifically, the resin composition for a nonwoven fabric may include an additive for master batch such as a liquid solid 0P950 together with the homopolypropylene resin as described above, and extruding the homopolypropylene resin by commonly mixing the additive for master batch &Lt; / RTI > The extrusion process for producing the resin composition may be carried out according to a conventional method. For example, an extruder such as a 25-MW-screw extruder, From about 150 ° C to about 250 ^° C, from about 100 rpm to about 1000 rpm. The resin composition contains both the homopolypropylene resin as described above to optimize both the tacticity and the molecular weight distribution (D), the melt index (Ml), the melting point (Tm) and the residual force ratio, , It can be useful as a resin composition for a nonwoven fabric which can simultaneously realize softness of softness and high strength which are physical properties in trade-of-f relationship in the production of nonwoven fabric. On the other hand, if the present invention provides a nonwoven fabric produced using the resin composition, the nonwoven fabric may be a spunbond nonwoven fabric produced by a melt blowing process. Specifically, the nonwoven fabric is produced by feeding a molten resin composition to a melt pump (65 rpm) using a Brabender conical twin screw extruder and then feeding the molten resin composition to a meltblowing die provided with a discharge port. . At this time, the melting temperature is 235 ^° C, the screw speed is 120 rpm, the die is maintained at 235 ^° C, the primary air temperature and pressure are 300 ^° C and 60 ^° C, respectively. kPa (8.7 psi), the polymer processing rate is 5.44 kg / hr, and the collector / die distance is 15.2 cm. Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments are described to facilitate understanding of the present invention. However, the following examples are intended to illustrate the present invention, but the present invention is not limited thereto.

&Lt; Preparation of catalyst >

Preparation Example 1: Preparation of transition metal compound and supported catalyst

Preparation of (diethylsilane-diyl) -bis (2-methylphenyl) 4,5-benzoindenyl) silane 2-Methyl-4,5-benzoindene (20.0 g) was dissolved in toluene / THF = 10 / 1 solution (220 mL), an n-butyllithium solution (2.5 M, nucleic acid solvent, 46 mL) was slowly added dropwise at 0 ^° C and then stirred at room temperature for one day. Then diethyldichlorosilane (8.6 g) was slowly added dropwise to the stirred solution at -78 ^° C, stirred for about 10 minutes and then stirred in the upper phase for one day. Thereafter, water was added to separate the organic layer, and then the solvent was distilled off under reduced pressure to obtain (diethylsilane-diyl) -bis (2-methyl-4,5-benzoindenyl) silane. ^' Step 2) Preparation of [(diethylsilane-diyl) -bis (2-methyl-4,5-benzoindenyl)] hafnium dichloride

Prepared in Step 1 (a silane-diethyl-diyl) -bis (2-methyl-S ^¬ benzo indenyl) silane was dissolved in toluene / THF = 5/1 solution (120 mL), n_-butyllithium solution (2.5 M, nucleic acid solvent, 46 mL) was slowly added dropwise at -78 ^° C, and then stirred at room temperature for one day. Hafnium chloride (17.6 g) was diluted in toluene (20 mL) at -78 ^° C and stirred at room temperature for one day. The solvent of the reaction mixture was removed under reduced pressure, dichloromethane was added thereto and the mixture was filtered, and the filtrate was distilled off under reduced pressure. (11.9 g, 30%, rac: < RTI ID = 0.0 > meso = 20: 1). Step 3) Preparation of the supported catalyst 100 g of silica and 10% of methylaluminoxane (670 g) were added to the 3L Liquor, and the mixture was stirred at 90 ^° C for 24 hours. After precipitation, the upper layer was removed and washed twice with LU. (5 g) of the anthra-metallocene compound rac- [(diethylsilanediyl) -bis (2-methyl-4,5-benzoindenyl)] hafnium dichloride And the mixture was stirred at 70 ^° C for 5 hours. After completion of the precipitation, the upper layer solution was removed, and the remaining reaction product was washed with dilute hydrochloric acid, washed again with nucleic acid, and vacuum dried to obtain 150 g of silica supported metallocene catalyst in the form of solid particles. Production Example 2: Preparation of transition metal compound and supported catalyst

Step 1) Preparation of (diethylsilane-diyl) -bis (2-methyl-4,5-benzoindenyl) silane

Butyllithium solution (2.5 M, nucleic acid solvent, 46 mL) was added to the solution after dissolving 2-methyl-4,5-benzoindene (20.0 g) in toluene / THF = Was slowly added dropwise at 0 ^° C, and then stirred at room temperature for one day. Then diethyldichlorosilane (8.6 g) was slowly added dropwise to the stirred solution at -78 ^° C, stirred for about 10 minutes and then stirred at room temperature for one day. Thereafter, water was added to separate the organic layer, and then the solvent was distilled off under reduced pressure to obtain (diethylsilane-diyl) -bis (2-methyl-4,5-benzoindenyl) silane. Step 2) Preparation of [(diethylsilane-diyl) -bis (2-methyl-4,5-benzoindenyl)] zirconium dichloride

The (diethylsilane-diyl) -bis (2-methyl-4,5-benzoindenyl) silane prepared in the above step 1 was dissolved in a solution of ruthenium / THF = 5/1 (120 mL) Lithium solution (2.5 M, nucleic acid solvent, 46 mL) was slowly added dropwise at -78 ^° C, and then stirred at room temperature for one day. Zirconium chloride (12.8 g) was added to the solution in vacuo, and the mixture was slowly added dropwise at -78 ^° C and stirred at room temperature for one day. The solvent of the NaOH solution was removed under reduced pressure, dichloromethane was added and the mixture was filtered, and the filtrate was distilled off under reduced pressure. (10.0 g, 29%, rac: [(2-methyl-4,5-benzoindenyl)] zirconium dichloride was obtained by recrystallization using luene and nucleic acid. meso = 22: 1). Step 3) Preparation of the supported catalyst

100 g of silica and 10% of methylaluminoxane (670 g) were added to the 3L Liquor, and the mixture was stirred at 90 ^° C for 24 hours. The precipitate was removed and the precipitate was removed and washed twice with toluene. (4.4 g) of the anthra-metallocene compound rac- [(diethylsilane-diyl) -bis (2-methyl-4,5-benzoindenyl)] zirconium dichloride To the reactor and then at 70 ^° C for 5 hours _. Lt; / RTI > After completion of the precipitation, the upper layer solution was removed, and the remaining reaction product was washed with dilute hydrochloric acid, washed again with nucleic acid, and vacuum dried to obtain 150 g of silica supported metallocene catalyst in the form of solid particles. Comparative Preparation Example 1: Preparation of transition metal compound and supported catalyst

To the transition metal compound represented by the formula A, [(6-t_-butoxycarbonyl haeksil methylsilane-diyl) -bis (2-methyl-4-tert-butylphenyl inde carbonyl)] For the manufacture using a ^zirconium, dichloride 2 in step 3), a silica-supported metallocene catalyst in the form of solid particles was prepared.

In the above formula (A), ¾ιι represents tertiary butyl. Comparative Preparation Example 2: Preparation of transition metal compound and supported catalyst

Silane-diyl) -bis (2-methyl-4,5-benzoindenyl)] zirconium dichloride, which is a transition metal compound represented by the following formula (B) A supported catalyst was prepared in the same manner as in step 3) of Preparation Example 2 above.

Comparative Preparation Example 3: Preparation of wrought supported catalyst (Methyl) silane-diyl) -bis (2-methyl-4,5-dihydroxyphenyl) propionate prepared according to steps 1) and 2) of Comparative Preparation Example 2,

(2-methyl-4-tert-butylphenylindenyl) zirconium dichloride represented by the formula (A) of Comparative Preparation Example 1 and [(6-t- ] Zirconium dichloride was used to prepare a wrought supported catalyst. 3 g of silica was pre-weighed in a shinkle flask, pre-weighed, and 13 osmol of methylaluminoxane (MAO) was added to the mixture at 95 ^° C for 24 hours. The precipitate was removed and the solution was washed once with diluted hydrochloric acid. Silane-diyl) -bis (2-methyl-4,5-benzoindenyl)] zirconium dichloride prepared in Comparative Preparation Example 2, [(6-t- 60 μ ιτιοΐ was dissolved in the ruben, and the reaction was allowed to proceed at 75 ^° C for 5 hours. After completion of the reaction, when the precipitation was completed, the upper layer solution was removed and the remaining reaction product was washed once with Ru-Ni. (2-methyl-4-tert-butylphenylindenyl)] zirconium dichloride prepared in Comparative Preparation Example 1, [(6-t_butoxyhydroxylmethylsilane-diyl) Was dissolved in the ruben, followed by further reaction at 75 ^° C for 2 hours. After the completion of the reaction, the upper layer solution was removed, and the remaining reaction product was washed with toluene, washed again with nucleic acid, and vacuum-dried to obtain 4.6 g of silica-supported metallocene catalyst in the form of solid particles. Comparative Preparation Example 4: Preparation of transition metal compound and supported catalyst

The same procedure as in the step 3) of Preparation Example 2 was carried out using the transition metal compound represented by the following formula (C), [(dimethylsilanediyl) -bis (2-methyl-4,5-benzoindenyl)] zirconium dichloride To prepare a supported catalyst.

&Lt; Production of Propylene Polymer &

Examples 1 and 2: Continuous bulk-slurry homopolymerization of propylene

In the presence of the silica-supported metallocene catalysts according to Preparation Examples 1 and 2, bulk-slurry polymerization of propylene was carried out using two continuous loop reactors. At this time, triethylaluminum (TEAL) and hydrogen gas were respectively introduced by using a pump, and the content of triethylaluminum (TEAL) and hydrogen gas was determined based on the amount of propylene continuously fed into the reactor Respectively. In addition, for the bulk-slurry polymerization, the supported catalyst prepared according to Production Examples 1 and 2 was used in the form of a mud catalyst mixed with oil and grease at 16%. The temperature of Banwoonggi was about 70 ^° C and the production rate was about 40 kg per hour. Specific reaction conditions for the polymerization processes of Examples 1 and 2 are shown in Table 1 below. Homopolypropylene (homo mPP) resin of Example 1 was obtained through such polymerization process. Comparative Example 1: Continuous bulk-slurry homopolymerization of propylene

The metallocene single supported catalyst prepared in Comparative Preparation Example 1 was used in place of the supported catalyst of Production Example 1, , A polymerization process was carried out in the same manner as in Example 1 to obtain a homopolypropylene resin of Comparative Example 1. [ Comparative Example 2: Homo polypropylene resin prepared by using a Ziegler-Natta catalyst A homopolypropylene resin (Z / N homo PP manufactured by LG Chemical Co., Ltd., H7700) prepared using a Ziegler-Tana catalyst was prepared. Comparative Example 3: Continuous bulk-slurry homopolymerization of propylene

A homopolypropylene resin of Comparative Example 3 was obtained by carrying out a polymerization process in the same manner as in Example 1, except that the stationary supported catalyst prepared in Comparative Preparation Example 2 was used in place of the supported catalyst of Production Example 1. Comparative Example 4: Continuous Bulk-Sulfur homopolymerization of propylene

A polymerization process was carried out in the same manner as in Example 1 except that the metallocene single supported catalyst prepared in Comparative Preparation Example 3 was used instead of the supported catalyst of Production Example 1 to obtain a homopolypropylene resin of Comparative Example 4 .

[Table 1]

In Table 1, "homo mPP ¹ refers to a homopolypropylene resin, and" Z / N homo PP ¹ refers to a homopolypropylene resin (commercial product) manufactured using a Ziegler-Tana catalyst. The catalyst activity in the above Table 1 was calculated as the ratio of the weight of the produced polymer (kg PP) per supported catalyst mass (g) used as a criterion based on the unit time (h). In particular, in the case of Comparative Example 4, since the catalytic polymerization activity is significantly lowered to 8 kg / g · cat, it may be difficult to apply the catalyst to commercial use or cause a problem of process failure. Comparative Example 5: Placement type of propylene Homopolymerization

A batch type homopolymerization process was carried out under the conditions shown in Table 2 below to obtain homopolypropylene resins of Comparative Examples 5 to 7. First, a 2 L stainless steel barn was vacuum dried at 65 ^° C, agitated, 3 mL of triethylaluminum was added at room temperature, and 770 g of propylene was added. After stirring for 10 minutes, 45 mg of the supported catalyst prepared in Comparative Preparation Example 2 was dispersed in 20 mL of nucleic acid to prepare a slurry, which was introduced into the reactor using nitrogen pressure. At this time, about 100 ppm of hydrogen gas was added together with the catalyst. Then, the temperature was raised gradually to 70 ° C and then polymerized for 1 hour. At the end of the reaction, the unreacted propylene was vented. Comparative Example 6: Placement type of propylene Homopolymerization

As shown in the following Table 2, the polymerization process was carried out in the same manner as in Comparative Example 5, except that the polymerization temperature was changed to 50 ^° C, to obtain a homopolypropylene resin of Comparative Example 6. Comparative Example 7: Placement type of propylene Random polymerization

As shown in the following Table 2, a polymerization process was carried out in the same manner as in Comparative Example 5 except that 20 g of ethylene was charged with 770 g of propylene to perform random polymerization, thereby obtaining a polypropylene homo / Random blend resin. Comparative Example 8: Placement type of propylene Homopolymerization

As shown in the following Table 2, the polymerization process was carried out in the same manner as in Comparative Example 5, except that the amount of hydrogen gas was changed to about 350 ppm to obtain a homopolypropylene resin of Comparative Example 8. [

[Table 2]

In Table 2, 'Homo mPP' refers to a homopolypropylene resin, and ¹ random mPP 'refers to a polypropylene homo / random blend resin in which propylene and ethylene are randomly copolymerized.

&Lt; Evaluation of physical properties of propylene polymer and nonwoven fabric produced therefrom > Test Example 1: Evaluation of physical properties of propylene polymer

The properties of the propylene polymers according to Examples and Comparative Examples were evaluated in the following manner, and the results are shown in Table 3 below.

(1) Melt index (MI t index, MI) Measured at 230 ^° C under a load of 2.16 kg according to the American Society for Testing and Materials Standard ASTM D 1238, expressed as the weight (g) of the polymer melted for 10 minutes. (2) Tacticity (mol%)

The tacticity (mol%) of the polymer was measured through nuclear magnetic resonance (NMR) analysis. Specifically, the NMR spectrum was measured using a nuclear chlorobutadiene solution (based on tetramethylsilane) and the peak area at 21.0 to 21.9 ppm relative to the overall area (100%) of the peak at 19.5 to 21.9 ppm The ratio (%) was obtained as tacticity (mol%). (3) Melting point (Tm)

Differential Scanning Calorimeter (DSC)

DSC 2920, manufacturer: TA instrument) was used to measure the melting point and melting point (Tm) of the propylene polymer. Specifically, the temperature of the polymer is heated up to 220 ^° C, held at that temperature for 5 minutes, then lowered to 20 ^° C, and the temperature is again increased to the top of the curve of DSC (Differential Scanning Calorimeter, TA) Respectively. In this case, the temperature rise and fall rates were 10 ^° C / min, and the melting points were measured at the second temperature rise.

(4) MWD (polydispersity index): The weight average molecular weight (Mw) and the number average molecular weight (Mn) of the polymer were measured using gel permeation chromatography (GPC) The molecular weight distribution (MWD) was calculated by dividing the average molecular weight by the number average molecular weight. Specifically, a Waters PL-GPC220 instrument was used as the gel permeation chromatography (GPC) apparatus, and a Polymer Laboratories PLgel MIX-B 300-mm long column was used. The measurement temperature was 160 ^° C. 1,2,4-Trichlorobenzene was used as a solvent and the flow rate was 1 mL / min. Samples of the polymers according to Examples and Comparative Examples were respectively dissolved in trichlorobenzene (1,2,4-Trichlorobenzene) containing 0.0125% of BHT at 160 ^° C for 10 hours using a GPC analyzer (PL-GP220) Pretreated, prepared at a concentration of 10 mg / 10 mL, and then fed in an amount of 200 iiL. Values of Mw and Mn were derived using a calibration curve formed using a polystyrene standard specimen. The weight average molecular weight of the polystyrene standard specimen is 2000 g / mol, 10000 g / mol, 30000 g / mol, 70000 g / mol, 200000 g / mol, 70000 g / mol, 2000000 g / mol, / mol. < / RTI >

(5) Measurement of residual stress ratio

For each of the propylene polymers according to the above Examples and Comparative Examples, a sample was taken, and 200% strain was applied at 235 ^° C, and the change in the residual force was measured for 10 minutes. The residual force was measured by using a DiScovery Hybrid Rheometer (TA) from TA Instruments. The sample was loaded between the upper and lower plates with a diameter of 25 하여 and dissolved ^at 235 캜. Based on the measured residual stress data, the ratio of the residual stress (1%) according to the following equation 2 is calculated and shown in Table 3 below:

[Equation 2]

Residual force ratio (Y) = (Si / RSo) 100

In the above equation 2, RSo is the residual force at 0.02 sec (t ₀ ) after applying 20 deformation to the polypropylene resin sample at 235 ^° C, It is the residual force at 1.00 sec () after 200% strain applied to the polypropylene resin sample at 235 ^° C.

[Table 3]

As shown in Table 3, the homopolypropylene resins of Examples 1 and 2 were optimized to a melt index (Ml) of 23 to 26 g / 10 min and a tacticity of 85% to 87%, and a narrow It has a molecular weight distribution (MWD), a low melting point (Tm) of 141 t or less, and a low residual force ratio of 0.03% or less. On the other hand, in the case of Comparative Examples 1 to 8, tacticity or molecular weight distribution (MWD), melt index (Ml), melting point (Tm) and residual power ratio can not be simultaneously satisfied. In particular, in Comparative Example 4, the melt index (Ml) is increased due to the low activity of the catalyst, the molecular weight distribution is increased to 2.6, and the residual force ratio is increased to 0.07%. Test Example 2

A spunbonded nonwoven fabric was prepared by performing the melt blowing process using the propylene polymer raw materials according to the above Examples and Comparative Examples. Specifically, a propylene polymer according to Examples 1 to 2 and Comparative Examples 1 to 8 and a propylene polymer (trade name) 0P950 A master batch of additive (2.5 wt%) was prepared and then pelletized. Subsequently, the molten masterbatch resin composition was fed to a melt pump (65 rpm) using a 31 ° Br Braider cone twin screw extruder, and then extruded at a discharge port (10 discharge ports / cm) and a 25 cm width Except for the fact that it was supplied to the meltblowing die, 4364 of the Naval Research Laboratories, published May 25, 1954 entitled " Manufacture of Superfine Organic Fibers " by Went e, Van. The master batch pellets were extruded into a microfiber web by a process similar to that described in A. Boone, CD, and Fluharty EL. The melt temperature was 235 ^° C, the screw speed was 120 rpm, the die was maintained at 235 ^° C, the primary air temperature and pressure were 300 ^° C and 60 kPa (8.7 psi), and the polymer throughput rate was 5.44 kg / hr and the collector / die distance was 15.2 cm. The properties of the spunbonded nonwoven fabric prepared using the polypropylene resin according to the above Examples and Comparative Examples were evaluated by the following methods, and the results are shown in Table 4 below. (1) Weight of nonwoven fabric

The weight of the nonwoven fabric produced by extruding into a superfine fiber web according to Test Example 2 was measured and the weight of the nonwoven fabric per unit area was measured.

(2) Processability of nonwoven fabric

The processability of the nonwoven fabric was evaluated according to whether the single yarn was generated during the production of the nonwoven fabric according to Test Example 2. When the single yarn occurrence of the fibers was 10% or less, the result was shown as "good"Quot; bad ". . (3) Strength of nonwoven fabric The strength of the nonwoven fabric was measured by a 5 cm wide cut strip method according to the American Society for Testing and Materials (ASTM D 5035: 2011 (2015) method)

(4) Friction coefficient of nonwoven fabric

The coefficient of friction of the nonwoven fabric was measured using a coefficient of friction meter (manufacturer: Thwing-Albert, product name: FP-2260).

(5) Sensitivity of nonwoven fabric

The sensibility of the nonwoven fabric was measured by ten blind panel evaluations, and when it was judged that the nonwoven fabric had a soft feel of more than 7, it was judged as being good, and when it was 4 to 6, , And when the number is 3 or less, it is judged to be defective and "X" is indicated.

[Table 4]

As shown in Table 4, in Examples 1 to 2, in which tacticity and molecular weight distribution (MWD), melt index (Ml), melting point () and residual force ratio were all optimized in accordance with an embodiment of the present invention Homopolypolyethylene resin can be used to produce a nonwoven fabric that is softer than conventional products by reducing the modulus while allowing the continuous process to be carried out because no single yarn is generated in the melt blowing process using the same. . On the other hand, the polypropylene resins of Comparative Examples 1 to 8, in which the tacticity or molecular weight distribution (MTO), the melt index (Ml), the melting point (Tm) It is impossible to carry out the continuous process due to the occurrence of single yarn in a melt blowing process and a disadvantage that the strength is lowered due to a broad molecular weight distribution appears or the coefficient of friction and the feel of the nonwoven fabric produced due to high tacticity It was confirmed that there was a falling problem. In particular, in Comparative Example 1, it was confirmed that there was a problem that the melting point was increased and the coefficient of friction and the feeling of touch of the produced nonwoven fabric were inferior. In Comparative Examples 2 and 3, it was confirmed that the nonwoven fabric had poor processability in production of the nonwoven fabric due to a wide molecular weight distribution of 3 or more, and the overall uniformity of the nonwoven fabric (partially or densely crowded portions) fell, resulting in poor strength, . In the case of Comparative Example 4, since the resin had a high melt index (Ml), it was impossible to produce a nonwoven fabric (not yet manufactured), and thus the physical properties of the nonwoven fabric could not be measured.

^In addition, the comparative example 5 shows that the overall uniformity of the nonwoven fabric (due to the presence of a partly or densely crowded portion) deteriorates in strength, friction coefficient and feelability due to a large workability due to a broad molecular weight distribution (> 2.4) have. Comparative Example 6 shows that even if the same catalyst is used, the production conditions of the resin are lower than the temperature range (70 ^° C) generally available in a commercial or laboratory environment at 50 ^° C It has been found that there is a problem that the friction coefficient and the feelability of the nonwoven fabric produced are low because the tacticity is increased. In Comparative Example 7, it was confirmed that the physical properties of the random resin, particularly the type of the resin, were not significantly degraded. In the case of Comparative Example 8, since the resin has a high fluidity such as a high hydrogen input amount and a melt index (Ml) of 50 g / 10 min, there is a problem of not only strength but also breakage in nonwoven fabrication, .

Claims

Claims:

Tacticity concertina and (tact i ci ty) is 80% to 90%, a molecular weight distribution (MWD) is more than 2.4, melt index, and (Ml) of from 20 to 30 g / min, melting point (Tm) of a less than 145 ^° C, A homopolypropylene resin for nonwoven fabric having a residual force ratio of 0.05% or less

[Claim 2]

The method according to claim 1,

A molecular weight distribution (D) of 2.1 to 2.4,

Homopolypropylene resin for nonwoven fabric.

[Claim 3]

The method according to claim 1,

The melting point (Tm) of 133 ^° C to 143 ^° C,

Homopolypropylene resin for nonwoven fabric.

Claim 4

The method according to claim 1,

Wherein the tacticity is 82% to 87%

Homopolypropylene resin for nonwoven fabric.

[Claim 5]

The method according to claim 1,

A melt index (Ml) of 23 g / min to 26 g / min,

Homopolypropylene resin for nonwoven fabric.

[Claim 6]

The method according to claim 1,

Wherein the residual force ratio is 0.006% to 0.03%

Homopolypropylene resin for nonwoven fabric.

[7]

A process for producing a homopolypropylene resin for a nonwoven fabric according to claim 1, comprising the step of polymerizing propylene in the presence of a single catalyst containing only a transition metal compound represented by the following formula (1) as a catalytically active component:

[Chemical Formula 1]

In Formula 1,

A is carbon, silicon or germanium,

M is a Group 4 transition metal;

X ¹ and X ² are the same or different and are each independently a halogen, a substituted or unsubstituted alkyl, substituted or unsubstituted C ₂ - ₂₀ alkenyl, substituted or unsubstituted C ₆ - ₂₀ aryl, nitro, amino ,, also, a substituted or unsubstituted d-20 alkyl, substituted or unsubstituted C ₆ - ₂₀ arylamino, a substituted or unsubstituted d-20 alkyl silyl group, a substituted or unsubstituted Cwo alkoxy or substituted or unsubstituted d - ₂₀ sulfonate;

R ¹ and R ⁶ are the same or different from each other, and each independently hydrogen or substituted or unsubstituted d-20 alkyl; R ² and R ^3, and R ⁷ and R ⁸ are each connected to each other substituted or unsubstituted C ₆ - to form a ₂₀ aliphatic or aromatic ring;

R ⁴ , R ⁵ , R ⁹ and R ¹⁰ are the same or different and each independently represents hydrogen, halogen, substituted or unsubstituted d- ₂₀ alkyl, substituted or unsubstituted C ₂ -C ₂₀ alkenyl, Substituted or unsubstituted alkylsilyl, substituted or unsubstituted silylalkyl, substituted or unsubstituted alkoxysilyl, substituted or unsubstituted d-20 ether, substituted or unsubstituted silyl ether, substituted or unsubstituted d-20 alkoxy, substituted or unsubstituted C ₆ - ₂₀ aryl, substituted or unsubstituted C ₇ - ₂₀ alkylaryl, or substituted or unsubstituted C ₇ - ₂₀ aryl-alkyl;

R ¹¹ and R ¹² are the same each other, C ₂ - ₂₀ is alkyl.

[Claim 8]

8. The method of claim 7,

R ² and R ³ and R ⁷ and R ⁸ are respectively connected to each other C ₆ - ₂₀ which is to form an aryl,

A process for producing homopolypropylene resin for nonwoven fabric.

[Claim 9]

8. The method of claim 7,

Wherein the transition metal compound is represented by the following formula (1-1).

In Formula 1-1,

A, M, X ¹ , X ² , R ¹ , R ⁴ , R ⁵ , R ⁶ , R ⁹ , R ¹⁰ , R ¹¹ and R ¹² are as defined in Reagent 1.

Claim 10

8. The method of claim 7,

A is silicon,

M is zirconium or hafnium,

A process for producing homopolypropylene resin for nonwoven fabric.

Claim 11

8. The method of claim 7,

X ¹ and X ² are each independently halogen,

A process for producing homopolypropylene resin for nonwoven fabric.

Claim 12 In the seventh aspect,

R ¹ and R ⁶ are each independently a process for producing a homo-polypropylene resin for hydrogen or d- ₅ straight chain alkyl, a non-woven fabric.

Claim 13

8. The method of claim 7,

R ⁴ , R ⁵ , R ⁹ , and R ¹⁰ are hydrogen,

A process for producing homopolypropylene resin for nonwoven fabric.

14.

8. The method of claim 7,

R ¹¹ and R ¹² are the same and are a C ₂ _-4 straight chain alkyl group,

A process for producing homopolypropylene resin for nonwoven fabric.

[Claim 15]

8. The method of claim 7,

Wherein the transition metal compound is represented by one of the following structural formulas. Production method of homopolypropylene resin for nonwoven fabric:

16.

8. The method of claim 7,

Wherein the polymerization step is a continuous bulk-slurry polymerization process. A process for producing homopolypropylene resin for nonwoven fabric.