TWI238862B - Spunbonded nonwoven fabric, laminate including the same, and production methods thereof - Google Patents

Abstract

A spunbonded nonwoven fabric according to the invention comprises a conjugate fiber (I) that is made up of at least two polymers selected from: (1) an ethylene polymer having a specific melt flow rate (MFR), density, and Mw/Mn ratio (Mw: weight-average molecular weight, Mn: number-average molecular weight); (2) a specific propylene block copolymer comprising soluble and insoluble portions in n-decane at 25 DEG C; and (3) a propylene polymer other than the propylene block copolymer (2). The spunbonded nonwoven fabric has a specific volume of not less than 10 cm<3>/g. A laminate of the invention includes a layer comprising the spunbonded nonwoven fabric and a layer comprising a nonwoven fabric that has a smaller specific volume than that of the spunbonded nonwoven fabric.

Description

1238862 V. Description of the invention (1) 1. [Technical field to which the invention belongs] The present invention relates to a spunbond non-stretched right sheet product and its manufacturing method *. This invention is particularly so: the spunbond non-woven fabric with the thinness of the non-woven fabric and excellent softness is reduced to a thin sheet product of appropriate cloth and its manufacturing method. Dagger 3 This visit is not sticky 2. [Previous technology] Step, Γme! It is soft and its wide application has been improved in recent years. Nature, and some nature needs to be improved

Woven with Q Q cleaning supplies (such as disposable diapers and sanitary napkins), add ㉟ before or after production. The shrinkage caused by heating gives Qing = He Shulai. Recently cleaning products need to be here: j To store = proper shrinkage to provide excellent softness and comfortable touch ^ JP-A-7 / 232 40 9 discloses a procedure in which a non-woven fabric is heated, which is made of two types of polymer Made of conjugated fibers of a resin, the two polyester resins have different heat shrinkage characteristics. However, JP —A-7 / 2324 09 does not provide a specific record of any thermal shrinkage characteristics, such as the percentage of thermal shrinkage. In addition, the nonwoven fabric containing this polyester resin is sufficiently bulky.邝-人 -20 02/1 4 6 663 and ^ 4 — 2 002/1 46 63 1 Non-woven fabric made of a total of fibers, the total fibers comprising a propylene segmented copolymer and another different polymer. However, these nonwoven fabrics are not heat-shrinked, so softness and touch are not satisfactory. In addition, these two documents do not mention the heat recovery of non-woven fabrics.

Page 8 1238862

Shrink percentage. 3. SUMMARY OF THE INVENTION An object of the present invention is to provide a spunbond non-woven fabric that has been shrunk to an appropriate degree with good softness and comfortable touch, and to provide a sheet product containing the non-woven fabric. Another object of the present invention is to provide a manufacturing method thereof.

The present inventors have found that a spunbond nonwoven fabric containing a specific conjugate fiber can be heated to a certain degree, and the spunbond nonwoven fabric can be shrunk to obtain an appropriate softness, thereby obtaining a spunbond nonwoven fabric for the above purpose (excellent softness and touch) . The present invention has been completed based on this finding. For example, the spunbond nonwoven fabric of the present invention includes a conjugated fiber (I). The conjugated fiber is polymerized by propylene in ethylene polymer (1), propylene segmented copolymer (2), and propylene segmented copolymer (2). At least two polymers are selected from the object (3), wherein: the spunbond non-woven fabric has a specific volume of not less than 10 c m3 / g;

Ethylene polymer (1) has a melt flow rate of 10 to 100 g / 10 mm (1 ^ feet, 11161 seven)? 1 (^ 『8 七 6) (at 190. (:, load 2.161 ^ Measurement) 'density of 860 to 9 75 kg / m3, and Mw / Mn ratio of 1.5 to 5 (Mw: weight average molecular weight' Mη · number average molecular weight); and propylene segmented copolymer (2) contains weight 20 to 70% of the part insoluble in n-decane at 25 ° C), and 80 to 30% by weight of the part (2-2) dissolved in A # alkane at 25 ° C, the insoluble part (2-1) Including two MFR 20 to 2 0 0 g / 10m in_

1238862 V. Description of the invention (3) Polymer, with ethylene units and alpha olefin units containing not more than 〇〇〇 〇i% total, the dissolved part (2-2) contains propylene, ethylene units, c4_8 alpha olefin units The copolymer contains 20 to 70 m% of a total amount of ethylene units and C4_8 alpha olefin units' and has an inherent viscosity [α] of not more than 2.0 dl / g. The propylene polymer (3) is preferably a propylene homopolymer or a random copolymer of propylene, ethylene, and / or (Vs α olefin. The spunbonded nonwoven fabric of the present invention is preferably a spunbonded nonwoven fabric (a) by heating. It is obtained that the spunbond nonwoven fabric (a) has a heat shrinkage percentage of not less than 10% at 100 ° C and a heat shrinkage percentage of not less than 30% at 120 ° C. These heat shrinkage percentages have a heat shrinkage percentage of not more than 3 The ratio (120 ° C / 100 ° C). The method for manufacturing a spunbond nonwoven fabric according to the present invention includes heating a spunbond nonwoven fabric (a), and a side spunbond nonwoven fabric (a) includes a total of | The coche fiber is made of at least two polymers selected from ethylene polymer (1), propylene segmented copolymer (2), and propylene polymer (3) other than propylene segmented copolymer (2). Among them: Spunbond non-woven fabric (a) has a heat shrinkage percentage of not less than 10% at 1000 ° C and a heat shrinkage percentage of not less than 30% at 120 ° C. These heat shrinkage percentages do not exceed 3 Ratio (1 20 ° C / 1 00 ° C); ethylene polymer (1) has a melt flow rate of 10 to 100 g / l0min Ratio (MFR) (measured at 190 ° C under a load of 2.16kg), a density of 860 to 97 5kg / m3, and a Mw / Mn ratio of 1.5 to 5 (Mw: weight average molecular weight, Mη: number average Molecular weight); and propylene segmented copolymer (2) contains 20 to 70% by weight insoluble at 25 ° C

Page 10 1238862 Description of the invention (4) The part of n-decane octadecane / alkane (Λ n, 80 to 30% by weight is dissolved at 25.0 in n-decane polymer, and (2—υ contains MFR) 20 to 20 0g / 10min of propylene hydrocarbon units, the human being contains not more than 10 mol% of the total ethylene units and Cu ^ ^ ^ ^ part (2-2) contains propylene, ethylene units, C4_8 α thin smoke # hydrocarbons Single S /, fish head contains 20 to 70 m0% of total ethylene units and «/ /, has an inherent viscosity [π] of not more than 2.0 dl / g.

The spunbonded sheet product includes at least one layer (A) and 1 / as in any of the above embodiments. Preferably, the sheet product comprises at least one layer of a spunbond nonwoven fabric (㈢) having a smaller specific volume than the spunbond nonwoven fabric (A). Che Jiao Jia Toast,. ’Spunbond nonwoven (A) was obtained by heating the spunbond nonwoven (a), and at 120. a) It has a heat shrinkage percentage of not less than 10% at 100 ° C and a heat shrinkage percentage of not less than 30% at C. These heat shrinkage percentages ^ do not exceed a ratio of 3 (1 2 0 ° c / 1 ο 〇 ° c). Chejiao 4 Guituist ’The non-woven fabric (B) is obtained by heating the non-woven fabric (b), which is the percentage of heat shrinkage of the spunbonded non-woven fabric (a). As in the method for manufacturing a sheet product according to the present invention, the method includes: · winding or heat-bonding a layer including a spunbond non-woven fabric (a) and a layer including a non-woven fabric (b); The fiber (i) is made of at least two polymers selected from ethylene polymer (1), propylene segmented copolymer (2), and propylene polymer (3) other than propylene segmented copolymer (2). The non-woven fabric has a smaller heat shrinkage percentage than the spunbonded non-woven fabric, and then the heat-treated sheet product, wherein:

Page 111238862 V. Description of the invention (5) ------ Spunbond non-woven fabric (a) has a heat shrinkage percentage of not less than 10% at 100t and not less than 30% at 120 ° c Heat shrinkage percentages, these heat shrinkage percentages have a ratio of no more than 3 (120 ° C / 100 ° C); the ethylene polymer (1) has a melt flow rate of 10 to 100 g / lOmin ( MFR) (measured at 190 ° C under a load of 2.16 kg), a density of 86 to 975 kg / m3, and a Mw / Mn ratio of 1.5 to 5 (Mψ ·· weight average molecular weight, Mη: number average molecular weight )·,as well as

The propylene segmented copolymer (2) contains 20 to 70% by weight of a portion (2-1) insoluble in n-decane at 25 ° C, and 80 to 30% by weight at 25. 〇 The part (2-2) dissolved in n-decane, Λ The insoluble part (2-1) contains a propylene polymer with MFR 20 to 200 g / 100 rouin, and contains not more than 丨 0 mol% Total ethylene units and hi Q hydrocarbon units, Gujiekou [5 points (2-2) copolymers containing propylene, ethylene units, c4_8 alpha olefin units, containing 20 to 70 m% of ethylene units And C4 8 alpha olefin units, and have an inherent viscosity [^. 4. [Embodiment] Hereinafter, a spunbond nonwoven fabric and a sheet product including the spunbond nonwoven fabric will be described in detail. <Spunbond Nonwoven Fabric> The spunbonded nonwoven fabric of the present invention includes a total of fibers (1), and the conjugate fiber (I) is composed of ethylene polymer (丨), propylene segmented copolymer (2), and At least two polymers selected from the propylene polymer (3) of the copolymer (2)

1238862

Made of material 'This spunbond nonwoven fabric has been heat-shrinked to a degree, and this heat-shrinkable non-woven fabric can be made by heating a spunbond nonwoven fabric (a), which contains a conjugate fiber (1), The conjugate fiber is made of at least two polymers selected from an ethylene polymer (1), a propylene segmented copolymer (2), and a propylene polymer (3) other than the propylene segmented copolymer (2). First, these components used in the present invention will be explained. (1) ethylene polymer

The ethylene polymer (1) may include an ethylene homopolymer or a copolymer of ethylene and an α-olefin. Alpha olefins contain 3 to 8 carbon atoms, such as propylene, 1-butene, dihexene, 1-octene, 4 ~ methyl-pentene. Specific examples of the ethylene polymer (1) include low-density polyethylene, linear low-density polyethylene (ethylene / α-olefin copolymer), medium-density polyethylene, and high-density polyethylene. In the present invention, these ethylene polymers may be used alone or in combination of two or more. Ethylene polymers can be manufactured in a conventional manner, using a multi-position catalyst such as Ziegler catalyst 'or using a single-position catalyst such as a metallocene catalyst.

Among the ethylene polymers listed above, from the standpoint of spinnability, linear low-density polyethylene resin (ethylene / α-olefin copolymer), medium-density polyethylene resin, and high-density polyethylene resin are particularly preferred. . The MFR of the ethylene polymer (1) is from 10 to 100 g / 10 min, preferably from 12 to 90 g / 10 min, or more preferably from 14 to 100 g when measured at 19 ° C under a load of 2.16 kg. 85g / 10min. As used herein, the liver {^ of ethylene polymer (1) is a value measured under ASTM D-1238 at 190 ° C under a load of 2.16 kg. The MFR of the ethylene polymer (1) should be in the above range regardless of whether the ethylene polymer is alone or in groups.

Page 13 1238862 V. Description of the invention (7) Use. That is, when the ethylene polymer ⑴ itself * has the above range but ^ is mixed when mixed with one or more other ethane polymers, the ethylene polymer mixture can be used as the present invention: B: polymer (1) The MFR of the acetamidine polymer (1) is one of the factors affecting the spinnability and strength of the non-woven fabric. When the ethylene polymer (1) has the above range ^, ^ can be obtained when making spunbond = woven fabric Spinnability, heat-shrinkable, spunbond non-woven fabric will have high strength. On the other hand, when the ethylene polymer (1) is less than 10g / lOmin, the spinnability is so bad that the non-woven fabric is likely to be in the textile process Is cut. Greater than 10 leaves / 1〇111 丨 1: 1 evaluation] [? Will cause lower fiber strength, resulting in less strong spunbond nonwovens. Ethylene polymers (1) density range from 8 60 to 975 kg / m3, preferably from 86 5 to 9 73 kg / m3, more preferably from 905 to 9 75 kg / m3, particularly preferably from 910 to 973 kg / m3. The density of the ethylene polymer (丨) can affect the resulting spunbond Properties and feel of non-woven fabrics. Density less than 860 kg / m3 will cause bad touch of spunbond non-woven fabrics with a density of more than 975 kg / m3 will cause too high rigidity to worsen the feel. The ethylene polymer (1) has a Mw / Mn ratio of 1.5 to 5 (Mw: weight average molecular weight 'Mη: number average molecular weight). As used in the specification, weight The average molecular weight (Mw) and the number average molecular weight (Μη) are values measured by polystyrene by gel chromatography (GPC) under the following conditions:

Columns: two TSKgel GMH6HT tubes and two TSKgel GMH6-HTL tubes

Tube temperature: 1 4 0 ° C

1238862 V. Description of the invention (8) Mobile phase: o-dichlorobenzene (ODCB) Flow rate: 1.0 mL / min

Sample concentration: 30mg / 20mL ODCB

Injection amount: 5 0 0 # L to dissolve 30 mg of the sample in 2 OmL o-dichlorobenzene, heat at 145 ° C for two hours, and filter the resulting solution through a sintered filter with 0 · 4 5 // m holes, To prepare an analysis sample. The ethylene polymer (1) is contained in the total fiber reed in an amount of 20 to 80% by weight.

(2) Propylene segmented copolymer The propylene segmented copolymer used in the present invention contains 20 to 70% by weight of a portion (2-1) insoluble in n-decane at 25 ° C, and 80 to 30% by weight Dissolved in n-decane at 25 ° C (2-2). The insoluble part (2-1) contains MFR (230 ° C, load 2.16kg) of propylene polymer of 20 to 200 g / 10min, and ethylene units containing not more than 10m% of the total amount and 0%. —8 alpha olefin unit. As used herein, the MFR of a propylene polymer is a value measured by ASTM D-1 238 at 23 0 ° C and a load of 2.16 kg. The dissolved portion (2-2) contains a copolymer of propylene, ethylene, or a C4_8 alpha olefin, containing 20 to 70 mol% of the total amount of ethylene units and C4_8 alpha olefin units, and has an inherent viscosity of not more than 2.0 dl / g [π]. As used herein, an ethylene unit is a structural unit derived from ethylene, and a C4_8 alpha olenic unit is a structural unit derived from a C4_8 alpha olefin of 4 to 8 carbon atoms.

Page 15 1238862

V. Description of the invention (9) The q 8 α-hydrocarbon of 4 to 8 carbon atoms used in the propylene segmented copolymer (2) contains linear or branched α-olefins. Specific examples include 1-butene, 1 to pentene, 1-hexene, 1-octene, and 4-methyl-1-pentene. Among them, J ~ tin is particularly preferred. The propylene segmented copolymer (2) can be produced by an ordinary method. For example, the melting components capable of forming the insoluble portion (2-1) and the dissolved portion (2-2) are mixed together by an organic forming device. Alternatively, depending on the use of olefin polymerization catalysts such as,

Ziegler-Natta catalyst or metallocene catalyst), the components that form the insoluble portion (2-1) and the dissolved portion (2_2) are sequentially polymerized in two stages. In the acrylic copolymer (2), the 'insoluble portion (2-1) and the dissolved portion (2-2) are perfectly dispersed. Therefore, in the manufacture of spunbond nonwoven fabric, good spinnability can be obtained. After heat shrinkage, the obtained spunbond nonwoven fabric will have excellent softness. The acrylic fine segmented copolymer (2) is contained in the total fiber (i) in an amount of 20 to 80% by weight. (3) propylene polymer

The propylene polymer (3) is a propylene polymer different from the propylene segmented copolymer (2). The propylene polymer (3) may include a propylene homopolymer or a random copolymer of propylene, ethylene, or a C4-8 alpha olefin (hereinafter, "propylene random copolymer"). The propylene homopolymer comprises crystalline homopolymerized propylene, which has a regularity index preferably greater than 90. Preferably, the propylene random copolymer will contain no more than 10 mol% of the total ethylene units and C4_8 alpha olefin units, more preferably,

Page 16 1238862 V. Description of the invention (10) &quot; 1 From 0.05 to 10 mol%. The C4 8 alpha olefin of 4 to 8 carbon atoms used in the propylene polymer (3) contains a linear or branched alpha olefin. Specific examples include buprene, 1-pentene, buproxen, bucin, and 4-methyl-bupentene. Of these, pinene ^ is particularly preferred.

Preferably, the MFR of the propylene polymer (3) measured at 2 30 ° C under a load of 2.16 kg ranges from 10 to 200 g / 10 min, or more preferably from 20 to 150 g / l Omin. As used herein, the liver of the propylene polymer (3) is a value measured in accordance with ASTM D -1 2 3 8 at 2 3 0 ° C and a load of 2 · 16 k g. Preferably, the propylene polymer (3) has a Mw / Mn ratio (Mw ·· weight average molecular weight, Mη: number average molecular weight) of ι · 5 to 5. For the purpose of good spinnability and particularly high strength of the common fiber, the preferred &amp; Mw / Mn ratio is in the range of 5 to 3.0. The propylene polymer (3) is contained in a total amount of 20 to 50% by weight. (Additives) In the present invention, 'various conventional additives can be selectively used in the polymers (1) to (3)' as long as the purpose of the invention is not impaired. Additives include various stabilizers (such as thermal stabilizers and weathering stabilizers), fillers, antistatic agents, hydrophilic agents, slip agents, anti-blocking agents, anti-fog agents, lubricants, dyes, pigments, natural oils, synthetic oils and minute fly. Example stabilizers include an anti-aging agent, such as dibutyl hydroxytoluene (BHT), a quaternary antioxidant, such as tetrakis [methylene-3- (3,5-dibutyl-acylbenzene) propionic acid] -(3,5-Dibutyl-4-hydroxybenzene) propanoic acid

Page 17 1238862 V. Description of the invention (π) ester, 2, 2'-ethylenediamido-di [ethyl-3- (3, 5-dibutyl-4 -hydroxybenzene)] propionic acid, I rganox 1 0 1 0 (trademark, hindered phenolic antioxidant); fatty acid metal salts, such as zinc stearate, stearic acid approx., 1,2-based stearic acid; polyvalent fatty acid lipids, such as monohard Glyceryl fatty acid, glyceryl distearate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate. These stabilizers may be used alone or in combination of two or more.

Example fillers include silica, diatomaceous earth, alumina, titanium oxide, magnesium oxide, pumice powder, pumice balloons, aluminum hydroxide, magnesium hydroxide, alkaline rhenium carbonate, dolomite, sulfuric acid # 5, potassium titanate, sulfuric acid Barium, sulfurous acid feed, high-grade stone, bentonite, graphite, aluminum powder, molybdenum sulfide. (a) Spunbond nonwoven fabric (a) contains a total of fibers (i) made of at least two polymers selected from the above polymers (1) to (3). As used herein, "fibers in common" means a monofilament having at least two fiber phases, the fiber phase having a length / diameter ratio that makes the strand suitable for a fiber. Here, the diameter is the diameter of the cross section of the fiber regarded as a circle. In other words, the conjugate fiber (i) is a monofilament made of at least two fiber phases, and the fiber phase contains one polymer selected from the polymers (1) to (3). The cross section of the conjugate fiber (i) can have a sheath-core configuration or a side-by-side configuration. Specifically, there are three types of sheath-core configurations: a concentric configuration, in which a circular core portion and a donut-shaped sheath portion are arranged in a concentric circle relationship; an eccentric configuration, in which the core portion is completely contained in the sheath portion and Centres are separated from each other;

Page 18 1238862 V. Description of the invention (12) ^ Exposing the core configuration 'where the core part is partially exposed from the sheath part' because their centers are far apart from each other. · Among the above configurations (parallel configuration, eccentric configuration, exposed core configuration), especially the parallel configuration and exposed core configuration are better. The configuration of these fibers across the cross section of the car is shown in Figure i, where (a) shows side-by-side arrangements, (b) shows concentric arrangements, (c) shows off-center arrangements, and (d) shows exposed core arrangements. Copolymers made of two or more of the polymers (1) to (3) /) can provide a spunbond nonwoven fabric (a) with appropriate heat shrinkage. In the present invention, the non-woven fabric (a) has a heat shrinkage percentage of not less than 10% at 10 (rc) and a heat shrinkage percentage of not less than 30% at 8c, which is 10.0% / 10.0%. The ratio of percentage is 疋 3 or less, preferably 2.5, more preferably 2 or less. The heat shrinkage percentage at 14 ° C is preferably 95% or less. Within the shrinkage percentage, the heat treatment of the spunbond non-woven fabric (a) will produce a moderately low yield, so the heat-shrinkable spunbond non-woven fabric can have an excellent softness. $ 4 〇c and the heat shrinkage percentage at 100 ° C The ratio falls within the above range. The significant difference in the percentage of heat shrinkage caused by changes in Li Er and Tian Li, so the heat treatment

LigofTV control is easy. In the present invention, the heat shrinkage percentage is a value measured in accordance with JIS w y 06. In the conjugate fiber (i) and ’, the heat shrinkage percentage is not less than 10 ¾ at 100 ° C, and not less than 30% at one hour. Expect a heat shrinkage percentage of 120 ° c / 100 ° c, at 14. No C super ’car is better than 2.5, and more preferably not more than 2. This dimension and right ... shrinkage percentage is preferably 95% or less. When conjugated, the percentage of heat shrinkage in the above range has the above heat shrinkage 1238862

Percent spunbond nonwovens are easily available. When the ratio of the heat shrinkage percentage at 12 ° and 10 ° rc falls within the above range, there will be no significant difference in the heat shrinkage percentage caused by thermal change, so the temperature control of heat treatment is easy ~ spunbond non-woven fabric (a) A fineness of not more than 8.0 Denny is preferred. In order to obtain a higher softness, it is more preferable that the fineness is 5.0 · denier or less. The basis weight of the spunbond nonwoven fabric (a) preferably ranges from 10 to 100 g / m2, more preferably from 12 to 90 仏 2. As used herein, "basis weight" is the weight of the fabric. (Preparation of spunbond non-woven fabric (a)) In the preparation of spunbond non-woven fabric (a), any common spun 5, 1 set of i-side spunbond method can be used to provide a sheath in the common fiber-core configuration OR 'will melt the specified configuration inclusions (1) to (3). According to Then, the nozzles, the spun-outs of the car, are spun into a predetermined spun-bonded non-woven fabric with hot embossing, and the spinning configuration of one or both nozzles in the polymerization machine. Pull up on the gas. Then seal or configure the spunbond non-woven fabrics with side-by-side configuration of the polymer (Polymer ⑴ to ⑴, two polymers I1) The two polymers in the first extruders or necessity, you can add additives to The polymer extruded polymer is passed through a textile fiber nozzle with a common fiber. It is designed to produce the desired, conjugated continuous fiber cooled with a cooling liquid, deposited with a fineness, and deposited with a predetermined thickness. Acupuncture, punching, ultra-; thermal bonding. Therefore, the desired inclusion arrangement (a) can be obtained. Hot embossing roller for thermal bonding can

1238862 V. Description of the invention (14) There are various percentages of embossed areas, and the percentages of embossed areas are preferably 5 to 30% by spinning with conjugate fiber spinning nozzles. State of the spunbond non-woven fabric (a), the total fiber textile bird spray nozzle ^ ^ sleeve-core group Health expectation sheath-core configuration. The annihilated leaf is used to produce (heat treatment of the spunbonded nonwoven fabric (a)). The spunbonded nonwoven fabric obtained as described above is heated (the spunbonded nonwoven fabric according to the present invention is obtained. The shrinkage used here is used so that the furnace can be continuous or batch Subtype. Heat treatment: by spunbond non-woven fabric (a). Also here to let hot air directly

The range from the second heat temperature is generally from 90 ° C, preferably from 95 ° C, more preferably c, to 14 ° c, preferably to ^ ", more preferably to 13.0 °. ", The range usually ranges from 20 seconds, preferably from 30 seconds, more preferably from 40 seconds to 180 seconds, preferably from 150 seconds, and even more preferably to 2 seconds. second. The heat-shrinkable spunbond nonwoven fabric obtained as described above contains conjugated fibers (丨), and the conjugated fibers (I) are made of at least two polymers selected from the following polymers. (1) Ethylene polymers lOOg / lOmij ^ O Hyun Melt Flow Rate (MFR) (measured at 19 0. (:, measured under a load of 2.16 kg), density of 8 6 0 to 97 5 kg / m3, and Mw / Mn of 1 5 to 5 Ratio (Mw: weight average molecular weight, Mη: number average molecular weight); (2) propylene segmented copolymer, containing 20 to 70% by weight of a portion (2-1) insoluble in n-decane at 25 ° C, and 80 to 30% by weight of the portion (2 _ 2) dissolved in n-decane at 25 ° C. The insoluble portion (2 -1) contains MFR (23 (TC, load 2.16 kg) 20

Page 21 1238862 5. Description of the invention (15) to propylene polymer of 200 g / l0min, and ethylene unit and q_8 alpha olefin unit containing not more than 10 mol% of the total, the dissolved portion (2-2 ) Copolymers containing propylene 'ethylammonium units, C4_8 alpha dilute hydrocarbon units, containing 20 to 70 mol% total ethylene units and C4-8 alpha olefin units, and having an inherent viscosity of not more than 2.0 dl / g [??]; and (3) a propylene polymer other than the propylene segmented copolymer (2).

The conjugate fiber (I) is derived from the heat shrinkage of the conjugate fiber (i). The spunbond nonwoven fabric has been heat-shrinked, so its specific volume is at least 10 cm3 / g, and preferably at least 11 cm3 / g, so it has excellent softness and touch. There is no specific limit to the upper limit of specific volume ', but 疋 Bi Valley is preferably less than 30 cm3 / g, more preferably less than 20 cm3 / g. The heat shrinkable spunbond preferably has 10 to 200 g. / m2 basis weight. Take 45. The bending resistance of the non-woven fabric measured by the cantilever method is preferably not more than 40 mm in the mechanical direction, more preferably not more than 30 mm, more preferably not more than 20 dragons, and preferably not more than 40 mm in the transverse direction, and more preferably not more than 3 〇mm, preferably not more than 20mm. Basis weight and bending resistance measured by the 45 cantilever method are measured with jIS l 1 0 9 6 ^ No, the cloth has excellent shrinkage and softness, has excellent stretchability, and seals you — T Heat-sealing properties, strength, and spinnability. It also has good anti-fluff properties. Plaque r

^ —Ren Yin was established, and the non-woven fabric is conducive to use in various applications, including medical products, Weifengtian σ 々 Gantian Youtian a &amp; hygienic mouth, and packaging materials. Spunbond non-woven can be especially used in sanitary products, ‘^ ^ Use mouth-washing disposable diapers and sanitary napkins. <Sheet product> Next, a thin mouth as in the present invention will be explained. The sheet product of the present invention is covered with at least one layer each of a heat-shrinkable spunbond fabric

1238862 Non-woven (a) treatment is completed under the same conditions. 5. Description of the invention (17) Heat treatment can be spunbonded to 0. The present invention will be described in the following examples. In the example * ratio; I, but it should be understood that the present invention does not limit the measurement of the percentage of heat shrinkage ..., the following properties are measured. … From the f product thermal non-woven fabric, take out three nearly 120t per lm of the sample width and keep the temperature at "set temperature" ㈣ or measure with JIS U 9 0 6. Outside 60 seconds, the percentage of heat shrinkage is (2 ) Basis weight measurement Basis weight is measured according to JIS L1 906. (3) Measurement of tensile strength and extensibility Take five samples from the non-woven fabric, each one in the mechanical direction, machlne direction) 15 〇 Then, in the horizontal direction (cd, cr0ss d ^ ecUon) 25 dragons. Take another five samples from the same non-woven fabric: one in MD 25 dragons and one in CD 150mm. The first five samples are clamped by the continuous stretching test machine. Tensile test with a head distance of 100mm and a stress rate of 100mm / min = tensile test. Measure the elongation under the most load and the elongation at break of the five samples in the mechanical direction, and average the obtained J to $ for the tensile test Measure the elongation of the last five samples under the maximum negative load in the mechanical direction, and the elongation at break, and average the maximum (4) 4 5 ° Cantilever method for bending resistance measurement ^ 页 Page 24 1238862 5. Description of the invention (18) Take three samples from the non-woven fabric, each at MD 150mm, at CD 20_, And take out three other samples, each at 020 dragons, at 1500 mm. The first two samples were measured for bending resistance in the mechanical direction with ji § [19 06]. The results obtained for f two samples were average. The last three samples were measured with bending resistance in the transverse direction, and the results were averaged. (5) Using Han dl eO -Me ter bending resistance measurement

Three samples were taken from the non-woven fabric, each at 0 100 mm and at CD 100 mm. Bending resistance was measured with Jis [1906 in the mechanical direction (0) and in the transverse direction (CD). The average of three samples was obtained as the bending resistance of the non-woven fabric. (6) Measurement of specific volume After the heat treatment of the nonwoven fabric, the thickness of the nonwoven fabric was measured in accordance with JIS L 1 906. Substituting the thickness and the basis weight obtained in (2) into the following formula to obtain the non-woven specific volume (cm3 / g) = thickness / basis weight (7) Tactile Measure the tactile feeling of sheet products according to the following criteria. A: Extreme Good B: Good

C: Equivalent to less flexible non-woven fabric (8) Looseness 1 The fluffiness of sheet products is evaluated according to the following criteria ... ‘Excellent Good C Equivalent to less flexible non-woven fabric

1238862 V. Description of the invention (19) (Example 1) A propylene segmented copolymer (BPP) contains: 40% by weight of insoluble portion (2-1), including a polypropylene (melting point 140 ° C, MFR (230 ° C, load 2.16kg): 60g / 10inin, ethylene unit content: 4.0 mol%), and 60% by weight dissolved part (2-2), containing propylene / ethylene copolymer rubber (inherent viscosity [?? ]: 1.59 dl / g, ethylene unit content: 30 mol%); and homopolypropylene (HPP) (melting point 162 ° C, MFR (230 t :, load 2.16kg): 60g / 10min, Mw / Mn: 2.5). The textile is melted and deposited on a collection surface. The obtained conjugate fiber has an exposed core configuration, in which the core includes homopolypropylene, the sheath includes a propylene segmented copolymer 'and has a weight ratio of 20/80 (HPP / BPP). Then the deposit was heated to emboss the deposit with an embossing roll (embossed area percentage: 18%) to produce a spunbond nonwoven fabric (a-1) having a basis weight of 20 g / m2 and a fiber fineness of 3 deniers. ° The properties of spunbond nonwoven fabric (a- 丨) were measured before heat treatment. The results are shown in Table 1. Then, the spunbond non-woven fabric (a-1) is heated in a furnace at 120 ° C for 60 seconds to obtain ... shrinking, square-bonded non-woven fabric (A-1). The properties of the spunbond nonwoven fabric (a _ 1) were measured, and the results are shown in Table 1. It is melted separately from 7C polypropylene (H pp), and single-component fibers are deposited on '^^ 隼; H fFi u ^ _ v. The deposit is then heated to embossing roll (embossed area percentage α, fiber fine yield of 3 Dan carcasses, to produce a spunbond non-woven fabric with a basis weight of 20 g / m2 and ^ dagger spoon (b-1) .Spunbond Nonwoven (b-1) Quilt

Page 26 1238862 V. Description of the invention (20) It is found that at 120 ° C, it has 0% 埶 跄 石 石 八 △ ό Mod / 0 heat shrinkage percentage. For reference, heat the spunbond non-woven fabric (b-ι) μsun π Beppelt a 1 ^ n ° C to a heat-shrinkable spunbond non-woven fabric (B-1) from * ^ bu seconds.彳 R 玑 玑 玑 CB-1) has a specific volume of 8.6cm3 / g. After laminating the spunbond nonwoven fabric (a ~: private π / At, + ^ 4,, a 1) and the spunbonded nonwoven fabric (b _ 1), a hot embossing roll (embossed area one hundred and eighteen ☆ ·] n〇 / 、 Wan * ren ^ Compensation ratio (10%)) They are heat-bonded to obtain a wafer product (1). The sheet openings r, η ^. The mouth of the watch (1) was heated to 120 ° C, and its heat shrinkage percentage at this temperature was measured. In a stove 1 2 0. (3 times' is @u 也 丨., ^ ^ ^ Bu heats the cymbal product (1) for 60 seconds, and obtains a heat-shrinkable sheet product. Ping Shi Pan, the touch and fluff of the sheet mouth. The results are as shown in Table i. (Example 2) Spunbond non-woven fabric (a ~ — copolymer (BPP) was made by the procedure of Example 1 in ethylene 1M 'except for the acrylic segment with MFRU9ITC, negative cut 2 I7 &quot; polymer ( ΡΕ1) (Density: 0 · 948… 1 &quot; 3, Qu Xicong *, 乂 · 16k§) ·· 30g / 10min, Mw / Mn: 3 · 0) Generation 1: after; non-woven (a'2) in Measure its properties before heat treatment. Heat-shrinking spun was heat-treated in the same way as in Example 1, and its properties were determined. My sister, I cloth (A-2). Spunbond non-woven cloth (A-2) was measured to confirm 8.2. ,,, The Q results are shown in Table 1. A sheet product (2) was made with the heat-shrinking hundred-eighth sequence of Example 1 at-° C. Measure it at 120 degrees, and evaluate the obtained sheet product (2) in the same way as in Example 1 Table i shows the tactile and fluffy properties of the heat-shrinkable sheet products. The results are shown in (Example 3). The spunbond nonwoven fabric (va 3) was made using the procedure shown in Example 1, except for acrylic.

Page 27 1238862

, M / rr / ^ (BPP) with ethylene copolymer (PE2) (density ··· 9 · 3 0g / cm M RL 190 c 'Zhenzhang2 · 16kg): 60g / 10min, Mw / Mn: 2 · 7 ) Instead = / spun, non-woven fabric (a-3) was measured for its properties before heat treatment. Then, the spunbonded nonwoven fabric (a-3) was heat-treated in the same manner as in Example 1, and the heat-shrinkable spunbonded nonwoven fabric (A-3) was produced. Spunbond nonwoven fabric (A-3) was measured to confirm its properties. The results are shown in Table 1. . A sheet product (3) was made according to the procedure shown in Example 1, and its heat shrinkage percentage at 120 C was measured. The sheet product (3) was heat-treated in the same manner as in Example 1 to evaluate the feel and bulkiness of the obtained heat-shrinkable sheet product. The results are shown in Table 1. Table 1 Example l Example 2 Example 3 Core / sheath HPP / BPP HPP / PE1 HPP / PE2 Before heat treatment (before the fabric heat shrinks) Basis weight (g / m2) 20 20 20 Maximum load MD 500 680 1200 CD 140 80 230 ⑼Stretch under large load⑼ j) MD 142 17 79 CD 262 47 93 Elongation at break (%) MD 167 68 88 CD 300 142 105 Bending resistance (45β cantilever method) (mm) MD 28 40 38 CD 10 17 16

1238862 V. Description of the invention (22) Bend resistance (Handle-0-Meter) (g) MD 0.7 CD 0.7 Percent heat shrinkage (%) 24 ^ 120 ° C 40 140σΓ 62 Percent heat shrinkage at 120 ° C / i〇〇 ° c Percent heat shrinkage 1.7 Before heat treatment (before heat shrinkage of the fabric) Resistance to bending (45 cantilever method) (mm) MD 22 CD 9 Flexure resistance (Handle-0-Meter) (g) MD 1Λ CD 1.3 Specific volume ( cm3 / g) 11_3 Percentage of heat shrinkage of sheet products (120.〇30 Touch A Awning A MD: Mechanical direction, CD: Horizontal

(Comparative Example 1) The homo polypropylene (HPP) used in Example 1 was separately melted and spun ^

-The constituent fibers are deposited on the -collection surface. Then heat the sediment, and then press: the grain is rolled (embossed area percentage: 18%), and the spunbond non-woven fabric (") of 3 denier is twice. Spunbond, I cloth (a-4) Measure its property f during heat treatment, and then spunbond "(a_4)

1238862 V. Description of the invention (23) Production of heat-shrinkable spunbond nonwoven fabric (A-4). Measure the spunbond non-woven fabric (A-4) to confirm its sex. The results are shown in Table 2. A sheet product (4) was made according to the procedure shown in Example 1, and its heat shrinkage percentage at 120 C was measured. The sheet product (4) was heat-treated in the same manner as in Example 1, and the feel and bulkiness of the obtained heat-shrinkable sheet product were evaluated. The results are shown in Table 2. (Comparative Example 2) A propylene / ethylene random copolymer (RPP) (melting point: 138 ° C, MFR: 60g / 10min) was melted separately, and single-component fibers were deposited on a collection sheet. Surface. The deposit is then heated to be embossed (percentage of embossed area: ρ 2 soil / redundant, resulting in a basis weight of 20 g / n) 2 and a fiber fineness of 3 Dan JL W: = 'non-woven fabric (aD. The properties of the spunbond non-woven fabric (a-5) were measured before heat treatment, and the results are shown in Table 2. After that, the spunbond non-woven fabric (a-5) was heat treated in the same way as the example method, and it was shrink-spunbonded, woven. (A-5). Measure the spunbond non-woven fabric (A-5) to confirm its properties. The results are shown in Table 2. The procedure shown was made-a sheet product, and it was measured at 120 rations =? Ratio. 5) The heat treatment is shown in Table 2 in the same manner as in Example 1. The heat shrinkage and fluffiness of the four-piece product are given. The results are as shown in (Comparative Example 3).

Reality: 1 Eight melted propylene copolymers (BPP) of Λ are melted and spun separately; fibers are deposited on a collection surface. And then heating and depositing ’embossing roll (embossed area percentage: 18%) to emboss this deposit,

Page 30 1238862 V. Description of the invention (24) Dedication: 具有 #No: with a basis weight of 20g / fll2, fiber fineness of 3 denier, ‘gugoru (a-6). Spunbond non-woven fabrics (βθ-negative negative _, 唧 ^ a — b) were measured before heat treatment. Cole, and then, the spunbond non-woven fabric (a_6) by example] the same method, 6) to confirm its properties. The results are shown in Table 2. ^ A sheet product (6) was prepared by the procedure shown in Example 1, and f = hot place. Heat shrinkable spunbond nonwoven fabric (A_6) was produced. Measure the spunbond non-iron difficulty (Bayi in 1 20. M shell example 1 is not made into a sheet product (6), the heat shrinkage percentage of the second hot spot C. The sheet product (6) is the same as the example i / = As expected, evaluate the tactile and fluffy properties of the obtained heat-shrinkable sheet products .... Table 2. Comparative Example 1 Comparative Example 2, Comparative Example 3 Heart-planting / sheath TTPP RPP ΒPP Before heat treatment (on cloth前 Before shrinkage) Basis weight (g / m2) 20 20 20 Maximum negative cut (g / 25mm) MD 3300 1400 410 CD 700 700 140 Stretch f / b under maximum load MD 53 47 144 CD 54 48 194 Elongation (%) MD 57 52 157 CD 63 58 208 Bending resistance (45B cantilever method) _) MD 50 46 40 CD 24 22 20 1238862 V. Description of the invention (25)

Bend resistance (Handle- 〇-Meter) (g) MD 2.1 2 2 CD 1.5 1.4 1 Percent heat shrinkage (%) 100 ° C 0 4 12 120 ° C 0 17 42 140 ° C 2 90 * 92 * 120X: heat Percent Shrinkage / 100 ° C Heat Shrinkage Percentage 4.3 3.5 Before Heat Treatment (Before Fabric Heat Shrink) Bending Resistance (45 ° Cantilever Method) (_) MD 56 50 45 CD 28 26 24 Bending Resistance (Handle-0-Meter) (g) MD 2.6 2.4 2.4 CD 1.7 1.7 2.4 Specific volume (cm3 / g) 8.6 83 6.7 Percent heat shrinkage of sheet products (120 ° C) 0 6 35 Touch CCB Canvas CCB

MD: mechanical direction, CD: lateral direction, * ·· represents that the fabric has been melted. The field of industrial use, such as the spunbond nonwoven fabric of the present invention, has shrunk to an appropriate degree, and has strength, stretchability, spinnability, and flexibility and Excellent balance of fluff resistance. Therefore, spunbond nonwovens can find their applications in various industrial products, such as medical products, sanitary products, and packaging materials. Spunbond nonwovens are particularly suitable for use on sanitary products including disposable diapers and tampons.

Page 32 1238862 Brief description of the drawings 5. [Simplified description of the drawings] Figure 1 shows the cross section of the conjugate fiber. — Figure 1 (a) shows a cross section of a side-by-side configuration. Figure 1 (b) shows a cross section of the concentric sheath-core configuration. Figure 1 (c) shows a cross section of the eccentric sheath-core configuration. Figure 1 (d) shows a cross section of the sheath-core type exposed core configuration. [Explanation of symbols] 1: First polymer 2: Second polymer 3: Core part 4: Sheath part

Claims (1)

1238862 _ Case No. 9210 ^ Month Day n_ VI. Scope of patent application (3) A random copolymer containing a propylene homopolymer or propylene, ethylene, and C48 alpha olefin. 3 · If the spunbond non-woven fabric in item 1 of the scope of patent application is applied, the spunbond non-woven fabric obtained by heating and bonding the total fibers is produced. 4 · A method for manufacturing a spunbond nonwoven fabric, comprising heating a spunbond nonwoven fabric (a) to shrink the spunbond nonwoven fabric (a), the spunbond nonwoven fabric (a) comprising a total of fibers (i) 'the co-light fiber (i ) Is made of at least two polymers selected from ethylene polymers (1), propylene segmented copolymers (2), and propylene polymers (3) other than propylene segmented copolymers (2), of which: spunbond The non-woven fabric (a) has a heat shrinkage percentage of not less than 10% at 100 ° C and a heat shrinkage percentage of not less than 30% at 120 ° C. These heat shrinkage percentages have a ratio of not more than 3 (120 ° C / 100 ° C); ethylene polymer (1) has a melting flow rate (MFR) of 10 to 100g / 10min (measured at 190 ° C under a load of 2.16kg), a density of 860 to 975kg / m3, and Mw / Mn ratios of 1.5 to 5 (Mw: weight average molecular weight, Mη: number average molecular weight); and propylene segmented copolymers (2) containing 20 to 70% by weight of n-decane-insoluble in 25 ° C Part (2-1), and 80 to 30% by weight of the part (2-2) dissolved in n-decane at 25 ° C, and the insoluble part (2_1) contains MFR 20 to 200 g / 10 minutes of acrylic polymer, with ethylene units and C4-8 alpha thin smoke containing not more than 10 mo 1% of the total amount. Page 35 1238862 ---- Amendment date of 192131321 Sixth, the scope of patent application-the dissolved part (2-2) contains propylene, ethylene units, c4_8 alpha olefin monomer copolymer, containing 20 to 70 mol% total The amount of ethylene units and C4_8 α-eneyanamidine 'has an inherent viscosity of not more than 2.0 dl / g [??]. 5 · A sheet product comprising at least one layer of spunbond non-woven fabric as described in claims 1 to 3 of the patent application. π • A sheet product comprising at least one layer of spunbond nonwoven fabric (A) and one layer of non-woven fabric having a lower specific volume than the spunbond nonwoven fabric (A). For example, the sheet product of item 6 of the patent application, where Spunbond nonwoven fabric (a) f is obtained by heating a spunbond nonwoven fabric (a). The spunbond nonwoven fabric (a) has a heat shrinkage percentage of not less than 10% at 100 C and a heat recovery of not less than 30% at 120 ° C. &amp; Percentages, these heat shrinkage percentages have a ratio of not more than 3 (120 ° C / 1000 ° C). For example, the sheet product according to item 7 of the patent application scope, wherein the non-woven fabric (B) is heated by heating a non-woven fabric ( b) It is obtained that the nonwoven fabric (b) has a heat shrinkage percentage smaller than that of the spunbond nonwoven fabric (a). • A method for manufacturing a sheet product, comprising: winding or heat-bonding a layer including a spunbond non-woven fabric (a) and a layer including a non-woven fabric (b), the spunbond non-woven fabric (a) including a conjugate fiber (i), Fiber (i) is made by polymerizing in ethylene Page 36 1238862 Case No. 92131321 Amendment VI. The scope of patent application-objects (1), propylene segmented copolymer (2), propylene polymer (3) other than diene segmented copolymer (2), at least two selected Made of polymer, the nonwoven has a smaller heat shrinkage percentage than the spunbond nonwoven fabric, and then the heat-treated sheet product, wherein: the spunbond nonwoven fabric (a) has a heat shrinkage percentage of not less than 10% at 100t and Heat shrinkage percentage of not less than 30% at 120 ° C, these heat shrinkage percentages have a ratio of not more than 3 (120 ° C / 100. 〇; acetamidine polymer (1) has 10 to 100 g / l. Melt flow rate (MFR, melt f low rate) min (measured at 190 ° C under a load of 2.16 kg), a density of 86 0 to 975 kg / m3, and a Mw / Mn ratio (Mw of 5 to 5) : Weight average molecular weight, Mn: number average molecular weight); and the propylene segmented copolymer (2) contains 20 to 70% by weight of the n-decane-insoluble portion (2-1) at 25 ° C, and 80 to 30% of the part (2-2) dissolved in n-decane at 25 ° C, the insoluble part (2-1) contains MFR20 to 200g / 10m In a propylene polymer, and a copolymer containing not more than 10 mol% of the total amount of ethylene units and C4_8 alpha olefins, the dissolved portion (2-2) contains a copolymer of propylene, ethylene units, and C4_8 alpha olefin units, including 20 to 70 mol% total ethylene units and C4_8 alpha olefin units, and have an inherent viscosity [π] of not more than 2.0 dl / g. Page 37