JP2009015317A - Rubbing cloth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubbing cloth, which is capable of suppressing the generation of contaminants such as peeled fibers at a rubbing treatment time, which has fine and homogeneous orientation performances for achieving a high resolution of a liquid crystal display device and which is homogeneously controlled in its pushing pressure while contacting an orientation film, thereby to have an excellent orientation regulating force. <P>SOLUTION: The rubbing cloth has a woven-knitted fabric and an elastic element laminated and integrated. Since the rubbing cloth has no raising tip, generation of the peeled fibers at a rubbing treatment time is suppressed or eliminated and the orientation film is not contaminated. Since the rubbing cloth has no uneven raising peculiar to a raising cloth, generation of rubbing unevenness causing a display defect of a liquid crystal is suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rubbing cloth. Specifically, when rubbing an alignment film for liquid crystal display that can achieve high-definition liquid crystal display, it has excellent alignment characteristics, is less likely to cause fiber scraping as a contamination source during rubbing treatment, and controls the desired resilience performance during rubbing treatment It relates to a rubbing cloth that can be used.

  In recent years, a liquid crystal display device has been widely used as a display device replacing a conventional CRT monitor, such as a game computer, a television, a monitor, a copying machine, and a camera, taking advantage of its thinness and small installation area. The liquid crystal display element used in these liquid crystal display devices has a small gap between a TFT substrate on which a driving element (TFT) made of a thin film transistor is formed and a color filter substrate (hereinafter abbreviated as a CF substrate) on which a color filter is formed. It is arranged so as to face each other with liquid crystal sealed in the gap. An alignment film is disposed on the surfaces of the TFT substrate and the CF substrate so as to cover the surface of the ITO electrode, and both are in contact with the liquid crystal to be sealed.

This alignment film is formed by appropriately selecting from materials such as SiO ₂ , polyimide, polyvinyl alcohol resin, or nylon-epoxy-organotitanium material according to the purpose or structure. In order to achieve this, an orientation treatment is performed. This alignment treatment is an important step in realizing uniform alignment of the liquid crystal layer.

  As the alignment treatment method, a rubbing method in which the surface of the alignment film is rubbed with a rubbing cloth is mainly used. The rubbing cloth is usually affixed to the outer peripheral surface of an aluminum or stainless steel roller, and the rubbing cloth is rubbed with the rubbing cloth by bringing the rubbing cloth on the outer peripheral surface into contact with the alignment film surface while rotating the roller. Thus, by rubbing the surface of the alignment film, the alignment film has alignment anisotropy in the direction rubbed with the rubbing cloth, and the liquid crystal molecules are aligned along the alignment direction of the alignment film to be uniform. Display characteristics can be obtained.

  As a rubbing cloth used in such a rubbing method, a fiber material made of natural fiber, semi-synthetic fiber, or synthetic fiber has been conventionally used.

  For example, a technique related to a rubbing material made of synthetic fibers has been proposed (see Patent Document 1). In this technique, a woven material is formed using polyester or polyamide as a synthetic fiber, and a rubbing material in which the alignment of liquid crystals is uniform is obtained by rubbing treatment. However, since the rubbing material composed only of the fabric is thin, it is difficult to uniformly control the pressing force of the rubbing fabric required during the rubbing process. However, the technical idea for imparting fine alignment is scarce, and as a result, the material has insufficient rubbing performance from the viewpoint of achieving high definition of the liquid crystal display device.

Moreover, as a material most frequently used as a rubbing cloth, there is a fiber material (pile brushed cloth) made of a pile of raised fibers such as velvet. Pile raised cloth for rubbing cloth is adjusted by changing the thickness of single fibers used in the pile and the number of single fibers to be driven (lines / cm ² ). The length is adjusted. Further, as fiber materials used for the pile portion, those using long fibers (filaments) made of cellulosic fibers such as rayon and triacetate, and those using short fibers such as fluff are known (Patent Document 2). reference).

  As a thing related to this pile raising cloth, the technique regarding the rubbing cloth which consists of a pile raising cloth using the irregular cross-section fiber is proposed (refer patent document 3), for example. In this technology, it becomes possible to perform a precise alignment process by making use of the sharp fiber side surface of a single fiber, and the pushing depth of the raised cloth during the rubbing process is adjusted based on the structure comprising the raised cloth. However, there was an advantage that the orientation force at the time of orientation could be controlled, but on the other hand, the raised single fiber was likely to cause fiber scraping during rubbing treatment, and easily contaminated the liquid crystal orientation film. The raised length of the raised cloth itself is slightly different on the surface of the raised cloth, that is, there is always a raised-length spot, so there is a concern about the occurrence of rubbing spots during the rubbing process, and avoiding the rubbing spots. It was difficult.

Moreover, the technique regarding the rubbing cloth which integrated the cushioning material in the raising cloth which consists of an ultrafine fiber is proposed (refer patent document 4). In this technique, finer orientation derived from ultrafine fibers can be expected. However, in addition to the problems such as the fiber shaving and the raised spots derived from the raised long spots similar to the above-mentioned Patent Document 2, the raising of the ultrafine fibers is not effective. In order to absorb the stress, the rebound characteristics of the provided cushion material were offset by the ultrafine fiber raising, and the orientation regulation force during the rubbing treatment tended to be rather inferior, Since there is no stiffness of the fiber itself when contacting the alignment film, not all of the ultrafine fibers are necessarily aligned in the direction to be aligned, and as a result, some ultrafine fibers that are not aligned in the alignment direction Thus, uniform alignment of the alignment film is hindered, and rubbing spots and defects in liquid crystal display are likely to occur.
Japanese Patent Laid-Open No. 1-288827 (Claims, Example 1) JP 2003-156746 A (Claims, Examples) JP-A-61-46932 (Claims, Figure 1) Japanese Patent Laying-Open No. 2005-91899 (Claims, Figure 1)

  The object of the present invention is to solve the above-mentioned problems of the prior art, suppress the generation of contaminants such as fiber scraping during rubbing treatment, and achieve a fine and uniform orientation for achieving high resolution of a liquid crystal display device. An object of the present invention is to provide a rubbing cloth having excellent alignment regulating force by uniformly controlling the pressing pressure of the rubbing cloth while being in contact with the alignment film.

The present invention adopts the following configuration in order to solve the above problems.
(1) A rubbing cloth in which a woven / knitted fabric and an elastic body are laminated and integrated.
(2) The rubbing cloth according to (1), wherein the woven or knitted fabric is a satin fabric.
(3) The rubbing cloth according to (1) or (2), wherein the number of fibers constituting the woven or knitted fabric is 30 or less per 1 cm square. The rubbing cloth according to any one of (1) to (3), wherein the number of single fibers of the warp or weft which is the surface layer is 2000 / cm or more.
(5) The rubbing cloth according to any one of (1) to (4), wherein the intersection of warp and weft of the satin fabric is repeated five or more times.
(6) The rubbing cloth according to any one of claims 1 to 5, wherein the single fiber fineness of the warp or weft as the surface layer of the satin fabric is 2.0 dtex or less.
(7) The rubbing cloth according to any one of (1) to (6), wherein the warp or weft which is a surface layer of the satin fabric is made of polyester and / or polyamide.
(8) The rubbing cloth according to any one of (1) to (7), wherein the warp or weft which is a surface layer of the satin fabric is made of non-crimped fibers.
(9) The ratio R (R = P2 / P1) of the stress (P1) at the time of 10% compression and the stress (P2) at the time of 50% compression in the thickness direction of the rubbing cloth is in the range of 0.90 ≦ R ≦ 2.00 The rubbing cloth according to any one of (1) to (8), wherein an elastic body is used.
The rubbing cloth according to any one of (6).

  Since the rubbing cloth of the present invention has an elastic body compared to a rubbing cloth made of only a conventional fabric, the rubbing cloth pressing stress required during the rubbing process can be adjusted, and the performance of orientation (orientation regulating force) ) Is excellent. In particular, when a satin fabric is used as the woven or knitted fabric, the fibers are arranged in parallel in the alignment direction of the alignment film, and the alignment performance is excellent. The number of fibers arranged in the alignment direction of the alignment film can be suitably selected according to the degree of alignment of the target alignment film, and is preferably employed because the design of the rubbing cloth is easy.

  On the other hand, compared to a conventional rubbing cloth made of a pile brushed cloth, the rubbing cloth of the present invention has no brushed tip, so the occurrence of fiber shaving during rubbing treatment is suppressed or does not occur, and the alignment film is contaminated. There is no worry. In addition, since there is no raised fluff peculiar to the raised cloth, there is an excellent effect that the occurrence of rubbing spots that lead to liquid crystal display defects is suppressed. Furthermore, when using a satin fabric as a woven or knitted fabric in the rubbing cloth of the present invention, the fibers used in the fabric are constrained. The alignment performance is excellent. In addition, the raised fabric usually requires twisted yarns that are twisted, so that the orientation regulation force tends to be insufficient. However, in the rubbing fabric of the present invention, the fibers used for the woven or knitted fabric should be non-crimped fibers. This can achieve uniform orientation.

  The rubbing cloth of the present invention is formed by laminating an elastic body on a woven or knitted fabric. Conventionally, a rubbing cloth made of a pile fabric, which has been widely used, has a problem that it cannot be optimized independently of the surface characteristics and the overall compression characteristics. That is, in order to make the rubbing treatment more uniform, if the fibers constituting the nap of the pile fabric were made thin, the compression characteristics of the entire rubbing cloth also changed, and only a rubbing cloth with poor cushioning could be obtained. . In the rubbing cloth of the present invention, the surface characteristics and cushioning properties of the rubbing cloth can be independently optimized by selecting and handling the woven and knitted fabric and the elastic body separately.

There are no particular restrictions on the woven or knitted fabric in the present invention. Plain fabrics, satin fabrics, twill fabrics and the like can be used for woven fabrics, and warp knitted fabrics, tubular knitted fabrics, weft knitted fabrics and the like can be used for knitted fabrics. Woven fabric is preferred. The satin knitted fabric has a large amount of either warp or weft exposed on the surface of the fabric. By making the rubbing treatment direction the same as the direction in which the many exposed yarns are lined up, the fibers of the rubbing cloth The uniformity of the degree of contact of the substrate is improved, and the rubbing effect can be made more uniform.
As used herein, the satin fabric is a fabric in which only a warp or a weft is present on the surface, and the portion appears as if only a warp or only a weft.

  In the satin woven fabric, the intersection (structure point) of the warp and the weft is not close to each other, and is arranged only once and apart in the woven structure (a repeating structural unit formed by the warp and the weft of the fabric). The satin fabric used in the present invention preferably has 5 or more repeats, more preferably 8 or more repeats, and more preferably 10 or more repeats. Is particularly preferred. The greater the number of repeats, the greater the exposure rate of warp only or weft only, and when the rubbing treatment is performed by pressing the satin fabric side against the alignment film with the laminated integrated rubbing cloth of the present invention, more This is because the performance of aligning the alignment film is excellent. In addition, when this organization point (intersection of warp or weft) is 5 repeats, it is called “5 sheets satin”, and when it is 8 repeats, it is called “8 sheets satin”. The more preferable form of the satin fabric is preferably 5 sheets or more, more preferably 8 sheets or more, and particularly preferably 10 sheets or more.

  As described above, the rubbing cloth of the present invention is formed by laminating and integrating the woven and knitted fabric and the elastic body. During the rubbing treatment, the rubbing treatment is performed by pressing the woven or knitted fabric side against the alignment film. When the woven or knitted fabric is a satin fabric, the surface of the satin fabric that is pressed against the alignment film during the rubbing process has many fibers exposed and aligned in a direction parallel to the rubbing direction. The exposed yarn may be a warp or a weft, but is preferably a warp weaving fabric with a large amount of warp that is easier to design in the manufacture of satin fabric. The many exposed fibers are aligned in parallel with the rubbing direction, and the alignment film is rubbed during the rubbing process to perform the alignment, which is aimed at in the present invention. Achieve precise orientation anisotropy.

  In the satin fabric, the more the number of single fibers of warps or wefts where many fibers are exposed on the surface pressed against the orientation film, the more precise orientation anisotropy can be achieved. The surface pressed against the alignment film, that is, the number of single fibers of the surface warp or weft, is preferably 2000 / cm or more, more preferably 3000 / cm or more, and 5000 / cm or more. Is particularly preferred. The upper limit of the number of single fibers is preferable as the number of fibers increases, but it is a fiber that can be produced, and when using ultrafine fibers with a single fiber fineness of 0.1 dtex or less obtained by composite spinning such as split fiber and leaching as described later Can stably obtain a satin fabric having a single fiber number of up to 250,000 pieces / cm.

  The fibers used in the woven or knitted fabric constituting the rubbing cloth of the present invention may be long fibers (filaments) or short fibers (staples). Therefore, a woven or knitted fabric made of long fibers is preferable. The preferred long fiber is preferably a multifilament, but the multifilament may be a multifilament having a single fineness, or a mixture of different finenesses having different fineness for each single fiber. It may be a fine yarn. Furthermore, one or more fibers with a large fineness are arranged in the core, and multiple fibers with a fineness are arranged in the sheath. The multifilament exhibits high rigidity and fineness. The core-sheath heterogeneity mixed yarn may be used.

  Since the number of multifilaments of warps or wefts arranged in a direction parallel to the rubbing direction on the surface pressed against the orientation film of the woven or knitted fabric can be increased, more precise anisotropic orientation can be achieved during the rubbing treatment. This is preferably at least 80 / cm, more preferably at least 80 / cm, and particularly preferably at least 90 / cm. The number of multifilaments can be stably produced at 200 / cm or less in view of producing a woven or knitted fabric, and is preferably 180 / cm or less. The number of single fibers constituting the multifilament (filament count) is preferably 36 or more, more preferably 48 or more, still more preferably 96 or more, and 144 or more. Most preferred. Moreover, although it is preferable that the filament count is large, the number that can be stably manufactured is 3000 or less.

  Further, since the single fiber used in the woven or knitted fabric constituting the rubbing cloth of the present invention is thinner, that is, the smaller the single fiber fineness, the finer orientation can be achieved during the rubbing treatment. Is preferably 2.0 dtex or less (hereinafter abbreviated as dtex), more preferably 1.5 dtex or less, and particularly preferably 1.0 dtex or less. Although the single fiber fineness is preferably as small as possible, if the fiber is excessively thin, the fiber is likely to be cut during rubbing treatment and fiber waste may be generated. Therefore, the single fiber fineness is preferably 0.005 dtex or more. It is more preferably 0.01 dtex or more, and particularly preferably 0.05 dtex or more. In addition, as a method of obtaining fibers having a small single fiber fineness, fibers having a single fiber fineness may be obtained by direct spinning, or after sea-island type composite spinning is performed, sea components are leached and only island components are extracted. Alternatively, after performing composite spinning, the fiber may be split to obtain a fiber having a small single fiber fineness.

  As for the cross-sectional shape of the single fiber constituting the woven or knitted fabric (the shape of the fiber in the cross-section of the fiber perpendicular to the fiber axis direction), the round shape or the oval shape has uniform fiber properties within the fiber cross-section. However, it is particularly preferable in that it has an isotropic bending stress and is less likely to cause fiber scraping. Here, the definition of an ellipse indicates that the ratio P (P = S / T) of the major axis S to the minor axis T of the ellipse is 2.0 or less. It is defined as On the other hand, depending on the characteristics of the alignment film used and the degree of alignment required, the cross-sectional shape of the single fiber can be suitably selected from flat, polygonal, multileaf, hollow, or indeterminate types. However, since the rigidity of the single fiber itself can be increased or decreased during the rubbing process by providing anisotropy in the bending direction of the fiber, the cross-sectional shape of the single fiber is polygonal, multi-leaf A mold is preferable, and since a fine rubbing process capable of achieving a high-definition liquid crystal display is possible, a polygon from sharp triangles to hexagons or a large number of leaves having sharp protrusions is three or more. Leaf type is particularly preferred.

  The warp or weft constituting the woven or knitted fabric, that is, the surface layer, is preferably made of non-crimped fibers. Usually, when manufacturing textile products such as woven fabrics and knitted fabrics, in order to amplify the entanglement and friction between the fibers and make a more firm fabric structure, swiveling crimps such as twisted yarn, false twisting, rubbing, The fibers are crimped by non-swivel crimps such as indentation, shaping, and multi-component compounding. Even in the woven or knitted fabric constituting the rubbing cloth of the present invention, when producing the woven or knitted fabric itself, crimped or non-crimped fibers can be used. As described above, it is preferable that the warp or weft as the surface layer of the woven or knitted fabric constituting the rubbing cloth of the present invention is made of non-crimped fibers (flat yarn).

  The fiber used for the woven or knitted fabric constituting the rubbing cloth of the present invention preferably has an initial tensile elastic modulus of 15 cN / dtex or more from the viewpoint that a wide range of rubbing performance according to the purpose can be imparted. In addition, the rubbing cloth can be strongly pressed to perform a rubbing treatment with a high degree of orientation of the alignment film, and it can withstand the repulsive stress at the moment when the rubbing cloth is pressed against the alignment film. Fibers having a high correlation with the elastic modulus are preferred, and the initial tensile elastic modulus is more preferably 45 cN / dtex or more, particularly preferably 70 cN / dtex or more, and 90 cN / dtex or more. Most preferred. Further, the upper limit of the initial tensile elastic modulus is preferable because it can be stably produced in a range of 300 cN / dtex or less, and more preferably 200 cN / dtex or less.

  The fiber used for the woven or knitted fabric constituting the rubbing cloth of the present invention preferably has durability because the fiber does not cut even when a fiber having a small single fiber fineness is used, so that the breaking strength is 2.0 cN. / Dtex or more is preferable, 2.5 cN / dtex or more is more preferable, and 3.0 cN / dtex or more is particularly preferable. The higher the breaking strength, the better. However, in consideration of productivity, a material having a strength of 7.0 cN / dtex or less is preferably manufactured. Regarding the residual elongation of the fiber, since the deformation of the fiber during the rubbing treatment is preferably small, the residual elongation is preferably 5 to 80%, and particularly preferably 5 to 50%.

  The fibers used in the woven or knitted fabric constituting the rubbing cloth of the present invention can be made using at least one of natural fibers, semi-synthetic fibers, regenerated fibers or synthetic fibers, but stable fiber properties and filaments as described above. From the viewpoint that the yarn is preferable, semi-synthetic fibers, regenerated fibers, and synthetic fibers are preferable, and synthetic fibers are particularly preferable.

  Examples of the polymer constituting the semisynthetic fiber, regenerated fiber, and synthetic fiber include, for example, polyesters, polyamides, polyimides, polyolefins, and vinyls such as polymethacrylate polymers and polyacrylonitrile polymers synthesized by addition polymerization of vinyl groups. Heat-resistant and fiber scraping, although various polymers such as polymer, fluorine polymer, cellulose polymer, silicone polymer, aromatic or aliphatic ketone, natural rubber and synthetic rubber, and other engineering plastics can be mentioned. Polyester and / or polyamide is preferred because of being less likely to occur.

  Examples of the preferred polyamide include polyamides formed by the reaction of carboxylic acid or carboxylic acid chloride and amine. Specifically, nylon 6, nylon 7, nylon 9, nylon 11, nylon 12, nylon 6,6, nylon 4,6, nylon 6,9, nylon 6,12, nylon 5,7, nylon 5,6, nylon 6T, nylon 9T, MXD6 nylon and the like, and other aromatic, aliphatic, and alicyclic dicarboxylic acids and aromatic, aliphatic, and alicyclic diamine components within the range not impairing the object of the present invention, or One compound such as aromatic, aliphatic, alicyclic, etc. may be used alone as an aminocarboxylic acid compound having both a carboxylic acid and an amino group, or the third and fourth copolymerization components may be used in common. It may be a polymerized polyamide.

  Examples of the preferred polyester include polyesters formed by esterification reaction of carboxylic acid and alcohol. Specifically, a polymer formed from an ester bond of a dicarboxylic acid compound and a diol compound can be exemplified, and as such a polymer, polyethylene terephthalate (PET), polytrimethylene terephthalate (referred to as polypropylene terephthalate). In some cases, aromatic polyesters such as PTT), polytetramethylene terephthalate (PBT), polyethylene naphthalate (PEN), polypropylene naphthalate (PPN) and polycyclohexanedimethanol terephthalate (PCMT), or aromatic hydroxycarboxylic acid Examples thereof include liquid crystal polyester having a melt liquid crystal property as a main component. As the polyester formed from the ester bond of the dicarboxylic acid compound and the diol compound, a polyester in which other components are copolymerized within a range not impairing the object of the present invention may be used. It can be polymerized. Examples of the dicarboxylic acid compound include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, anthracene dicarboxylic acid, phenanthrene dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenoxyethanedicarboxylic acid, diphenylethanedicarboxylic acid, adipic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 5-sodium sulfoisophthalic acid, 5-tetrabutylphosphonium isophthalic acid, azelaic acid, dodecanedioic acid, hexahydroterephthalic acid, aromatic, aliphatic, alicyclic dicarboxylic acids and their Derivatives, adducts, structural isomers and optical isomers such as alkyl, alkoxy, allyl, aryl, amino, imino, halide, etc. One Chi may be used alone, or purpose may be used in combination of two or more in a range that does not impair the present invention.

  Further, as a preferable copolymerization component of the polyester, a diol compound can be copolymerized. Examples of the diol compound include ethylene glycol, propylene glycol, butylene glycol, pentanediol, hexanediol, and 1,4-cyclohexanediene. Methanol, neopentyl glycol, hydroquinone, resorcin, dihydroxybiphenyl, naphthalenediol, anthracenediol, phenanthrenediol, 2,2-bis (4-hydroxyphenyl) propane, 4,4'-dihydroxydiphenyl ether, bisphenol S, polyethylene glycol, polypropylene Aromatic, aliphatic, and alicyclic diol compounds such as glycol and polybutylene ether, and their alkyl, alkoxy, allyl, Derivatives such as reel, amino, imino and halide, adducts, structural isomers and optical isomers can be mentioned. One of these diol compounds may be used alone, or the object of the present invention is Two or more kinds may be used in combination as long as they are not impaired.

  Examples of the preferable polyester copolymerization component include a compound having a hydroxyl group and a carboxylic acid in one compound, that is, a hydroxycarboxylic acid. Examples of the hydroxycarboxylic acid include lactic acid, 3-hydroxypropio Aromatic, aliphatic, alicyclic such as nate, 3-hydroxybutyrate, 3-hydroxybutyrate valerate, hydroxybenzoic acid, hydroxynaphthoic acid, hydroxyanthracenecarboxylic acid, hydroxyphenanthrenecarboxylic acid, (hydroxyphenyl) vinylcarboxylic acid Group diol compounds and their derivatives such as alkyl, alkoxy, allyl, aryl, amino, imino, halides, adducts, structural isomers and optical isomers. It may be used in, or object may be used in combination of two or more in a range that does not impair the present invention.

  The preferred polyester may be a polyester in which one compound such as aromatic, aliphatic and alicyclic is mainly composed of a hydroxycarboxylic acid compound having a carboxylic acid and a hydroxyl group. Examples of the polymer comprising an acid include polyglycolic acid, polylactic acid, poly (3-hydroxybutyric acid), poly (4-hydroxybutyric acid), poly (4-hydroxyvaleric acid), and poly (6-hydroxycaproic acid). Polyesters such as polyglycolic acid and polylactic acid that are polymerized from a single monomer, such as polyesters composed of such hydroxycarboxylic acids, and aliphatic lactones such as glycolide, lactide, butyrolactone, caprolactone, etc. Also to these poly (hydroxycarboxylic acids) An aromatic, aliphatic, or alicyclic dicarboxylic acid, or an aromatic, aliphatic, or alicyclic diol component may be used as long as the object of the present invention is not impaired, or a plurality of hydroxycarboxylic acids may be used. It may be copolymerized.

  Since these preferred polyesters have a high initial tensile elastic modulus, they can maintain excellent orientation characteristics when a woven or knitted fabric is formed in the rubbing process, or because they have a high melting point, they occur during the rubbing process. From the point that deformation of the fiber hardly occurs due to frictional heat, PET polymer, PTT polymer, PBT polymer, PEN polymer, PCMT polymer, PPN polymer are preferable, and PET polymer, PEN polymer, PCMT polymer Polyesters such as polymers are particularly preferred.

  As for the fiber used for the woven or knitted fabric constituting the rubbing cloth of the present invention, polyester and / or polyamide which is preferable as described above is preferably used, but polyester and / or polyamide may be used alone. Moreover, you may use multiple types together in the range which does not impair the objective of this invention. Alternatively, within the range that does not impair the object of the present invention, the woven or knitted fabric used in the present invention may be mixed with conductive fibers, electrostatic fibers, or stretch fibers as necessary. .

  Further, the fibers used in the woven or knitted fabric constituting the rubbing cloth of the present invention are matting agents, flame retardants, lubricants, thinning agents, antioxidants, ultraviolet absorbers, infrared absorbers, as long as the object of the present invention is not impaired. A small amount of additives such as a crystal nucleating agent, a fluorescent brightening agent, a terminal group blocking agent, and a conductive agent may be retained.

  The rubbing cloth of the present invention is formed by laminating an elastic body on the woven or knitted fabric. When the rubbing cloth formed by laminating and integrating the woven and knitted fabric of the present invention and the elastic body is used in the rubbing treatment, the woven and knitted fabric side is disposed so as to contact the alignment film, and the elastic body uses the woven and knitted fabric as the alignment film. Play the role of pressing. As a material suitable for the elastic layer, foamed polyurethane, foamed polyethylene, foamed polypropylene, foamed polystyrene, foamed polylactic acid, nonwoven fabric, or the like can be used. In addition, for the purpose of adjusting mechanical properties such as elastic modulus, a nonwoven fabric or a woven or knitted fabric impregnated and coated with a resin such as polyurethane or melamine can also be used. Among them, polyurethane foam is more preferable because it has good elasticity and has good adhesion when laminated and integrated with a woven or knitted fabric. Such polyurethane foam comprises an isocyanate component, a polyol component (high molecular weight polyol component, low molecular weight polyol component), and a chain extender. As the isocyanate component, a known compound in the field of polyurethane can be used without particular limitation. As the isocyanate component, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,2′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, aromatic diisocyanates such as p-phenylene diisocyanate, m-phenylene diisocyanate, p-xylylene diisocyanate, m-xylylene diisocyanate, ethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 1,6-hexamethylene diisocyanate, etc. Aliphatic diisocyanate, 1,4-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone Isocyanates, alicyclic diisocyanates such as norbornane diisocyanate. These may be used alone or in combination of two or more. As the isocyanate component, a trifunctional or higher polyfunctional polyisocyanate compound can be used in addition to the diisocyanate compound. As a polyfunctional isocyanate compound, a series of diisocyanate adduct compounds are commercially available as Desmodur-N (manufactured by Bayer) or trade name Duranate (manufactured by Asahi Kasei Kogyo Co., Ltd.). Of the above isocyanate components, it is preferable to use an aromatic diisocyanate and an alicyclic diisocyanate in combination, and it is particularly preferable to use toluene diisocyanate and dicyclohexylmethane diisocyanate in combination. Examples of the high molecular weight polyol component include polyether polyols typified by polytetramethylene ether glycol, polyester polyols typified by polybutylene adipate, polycaprolactone polyol, and a reaction product of polyester glycol such as polycaprolactone and alkylene carbonate. Exemplified polyester polycarbonate polyol, polyester polycarbonate polyol obtained by reacting ethylene carbonate with polyhydric alcohol and then reacting the obtained reaction mixture with organic dicarboxylic acid, and polycarbonate obtained by transesterification reaction between polyhydroxyl compound and aryl carbonate A polyol etc. are mentioned. These may be used alone or in combination of two or more. The number average molecular weight of the high molecular weight polyol component is not particularly limited, but is preferably 500 to 2000 from the viewpoint of the elastic properties of the resulting polyurethane resin. When the number average molecular weight is less than 500, a polyurethane resin using the number average molecular weight does not have sufficient elastic properties and becomes a brittle polymer. On the other hand, when the number average molecular weight exceeds 2000, a polyurethane resin using the number average molecular weight becomes too soft. In addition to the high molecular weight polyol component described above as the polyol component, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1, A low molecular weight polyol component such as 4-cyclohexanedimethanol, 3-methyl-1,5-pentanediol, diethylene glycol, triethylene glycol, 1,4-bis (2-hydroxyethoxy) benzene is preferably used in combination. Low molecular weight polyamine components such as ethylenediamine, tolylenediamine, diphenylmethanediamine, and diethylenetriamine may be used. The (number average) molecular weight of the low molecular weight polyol component or the low molecular weight polyamine component is less than 500, preferably 250 or less. When a polyurethane resin foam is produced by a prepolymer method, a chain extender is used for curing the prepolymer. The chain extender is an organic compound having at least two active hydrogen groups, and examples of the active hydrogen group include a hydroxyl group, a primary or secondary amino group, and a thiol group (SH). Specifically, 4,4′-methylenebis (o-chloroaniline) (MOCA), 2,6-dichloro-p-phenylenediamine, 4,4′-methylenebis (2,3-dichloroaniline), 3,5 -Bis (methylthio) -2,4-toluenediamine, 3,5-bis (methylthio) -2,6-toluenediamine, 3,5-diethyltoluene-2,4-diamine, 3,5-diethyltoluene-2 , 6-diamine, trimethylene glycol-di-p-aminobenzoate, 1,2-bis (2-aminophenylthio) ethane, 4,4′-diamino-3,3′-diethyl-5,5′-dimethyl Diphenylmethane, N, N′-di-sec-butyl-4,4′-diaminodiphenylmethane, 3,3′-diethyl-4,4′-diaminodiphenylmethane, m-xyl Diamines, N, N′-di-sec-butyl-p-phenylenediamine, m-phenylenediamine, and polyamines exemplified by p-xylylenediamine, or the above-described low molecular weight polyol components and low molecular weight polyamine components Can be mentioned. These may be used alone or in combination of two or more. The ratio of the isocyanate component, the polyol component, and the chain extender can be variously changed depending on the molecular weight and desired physical properties. The polyurethane resin foam can be produced by either the prepolymer method or the one-shot method. However, an isocyanate-terminated prepolymer is synthesized beforehand from an isocyanate component and a polyol component, and this is reacted with a chain extender. The polymer method is preferred because the resulting polyurethane resin has excellent physical properties. As the isocyanate-terminated prepolymer, those having a molecular weight of about 800 to 5000 are preferable because of excellent processability and physical characteristics. Examples of the method for producing the polyurethane resin foam include a method of adding hollow beads, a mechanical foaming method, and a chemical foaming method.

  Further, as another method for obtaining foamed polyurethane, a method of wet coagulating polyurethane can be employed. In this method, a polyurethane resin is dissolved in a water miscible solvent such as DMF, and then cast on a release paper or film, and the release paper or film is immersed in water or an aqueous solution of the water miscible solvent. This is a method in which a microporous structure is formed when the water-miscible solvent is replaced with water or the like and the polyurethane is solidified.

  The elastic body obtained in this way is laminated and integrated with a woven or knitted fabric to form a rubbing cloth. As the integration method, it is preferable to integrate by a frame lamination method or a bonding method, The bonding method is more preferable because it does not involve heat treatment. That is, as a method for adhering the woven or knitted fabric and the elastic body, a method in which an adhesive is applied to one of the woven or knitted fabric or the elastic body and bonded to the other can be preferably used. As such an adhesive, acrylic, polyurethane, polyester, and polyurethane resins can be appropriately selected and used. As a method for applying such an adhesive, it is possible to employ a method in which the adhesive is heated and melted to a melting point or higher, a method in which the adhesive is dissolved in a solvent, or a method in which the adhesive is dispersed in water. it can. Alternatively, a method in which an adhesive formed into a nonwoven fabric or a film is sandwiched between a woven or knitted fabric and an elastic body, and is hot-pressed for bonding. Even in the bonding method, there are a method of fixing the woven and knitted fabric and the elastic body at several points and a method of fixing the entire surface, but avoiding the occurrence of a deviation between the woven and knitted fabric and the elastic body during the rubbing process. In order to achieve this, a method in which the woven and knitted fabric and the elastic body are fixed using an adhesive on the entire surface is particularly preferable.

  The rubbing cloth of the present invention uses an elastic body, which is a ratio R (R = P2) of the stress (P1) at the time of 10% compression and the stress (P2) at the time of 50% compression in the thickness direction of the rubbing cloth. / P1) is preferably an elastic body in the range of 0.90 ≦ R ≦ 2.00. Normally, in the rubbing process, a rubbing roller having a peripheral surface formed by a rubbing cloth is brought into contact with the alignment film formed on the substrate surface while rotating and moved linearly, and the alignment film is anisotropically oriented. The distance between the curved roller surface and the alignment film changes continuously with the rotation of the roller until the rubbing roller contacts and leaves the alignment film. While rotating, it undergoes continuous compressive deformation in the rubbing cloth thickness direction. In the rubbing treatment, it is preferable to perform the orientation treatment with a constant stress without changing the orientation performance of the rubbing cloth as much as possible during the series of compression deformations. That is, since the rubbing cloth in which the woven and knitted fabric and the elastic body are laminated and integrated as in the present invention, it is preferable that the stress during compression of the elastic body does not change during the above-described continuous compression deformation. is there. Therefore, in the rubbing cloth of the present invention, the ratio R (R = P2 / P1) of the stress (P1) at the time of 10% compression and the stress (P2) at the time of 50% compression in the thickness direction of the rubbing cloth is 0.90 ≦ R ≦. By using an elastic body in the range of 2.00, stable alignment performance can be exhibited during rubbing. From the viewpoint of having stable rubbing performance free from alignment spots, the ratio R is more preferably in the range of 0.90 ≦ R ≦ 1.80, and in the range of 1.00 ≦ R ≦ 1.50. It is particularly preferred.

  In the rubbing cloth of the present invention, the thickness of the rubbing cloth may be determined by the rubbing apparatus to be used, but the rubbing cloth thickness is preferably 0.5 mm or more in that the resilience characteristic of the elastic body acts effectively. , 1.0 mm or more is more preferable, and 1.5 mm or more is preferable. Further, the upper limit of the thickness of the rubbing cloth is preferably 20 mm or less, more preferably 10 mm or less because it is difficult to attach the rubbing cloth to the rubbing apparatus when it is excessively thick.

  EXAMPLES Hereinafter, the present invention will be described specifically and in detail with reference to examples, but the present invention is not limited only to these examples. In addition, the physical-property value in an Example was measured with the following method.

A. Measurement of single fiber fineness [decitex (dtex)] A fiber (multifilament) is crushed by a length of 100 m, and the weight (g) of the chopped fiber is measured and multiplied by 100. The average value of three times obtained by measuring in the same manner as the fineness of the multifilament, and the value obtained by dividing the fineness by the number of single fibers constituting the multifilament is defined as the single fiber fineness [dtex] with two significant digits. Calculated.

B. Measurement of initial tensile elastic modulus, residual elongation, and breaking strength of fiber Tensilon tensile tester (TENSIRON UCT-100) manufactured by Orientec Co., Ltd., if it is an undrawn yarn, the initial sample length is 50 mm, and the tensile speed is 400 mm / min. In the case of drawn yarn, the initial tensile elastic modulus (drawn yarn only), breaking strength and residual elongation were measured at an initial sample length of 200 mm and a tensile speed of 200 mm / min, respectively, and the average value measured five times was used as the measured value. . The initial tensile elastic modulus was recorded on chart paper as a chart speed of 100 cm / min and a stress full range of 500 g, and was determined from the slope of the initial tensile curve. The initial tensile elastic modulus, residual elongation, and breaking strength were all calculated as two significant figures.

C. Calculation of ratio R (R = P2 / P1) of stress (P1) at the time of 10% compression and stress (P2) at the time of 50% compression of the elastic body JIS K6400-2 (2004) 7. Using a compression deflection B method, a pressure plate with a diameter of 200 mm using a sample piece having a thickness of 50 mm, a length of 300 mm, and a length of 300 mm in an atmosphere at a temperature of 23 ° C. and a relative humidity of 50%. Then, after pressing to a thickness of 75% of the sample piece at an indentation speed of 100 mm per minute, the pressure plate was returned at the same speed, and a series of compression-stress curves were automatically recorded to perform the measurement. The ratio R was calculated as 3 significant figures from the stress (P1) at the time of 10% compression and the stress (P2) at the time of 50% indentation.

D. Evaluation of orientation performance (alignment regulating force) and evaluation of fiber shaving A substrate with an alignment film, which is an object of rubbing treatment, was prepared and evaluated by rubbing treatment. Specifically, a 10 cm square glass substrate provided with a polyimide alignment film was used, while the rubbing cloth was attached to a stainless rubbing roller having a diameter of 50 mm with double-sided tape and attached to a rubbing apparatus. The polyimide alignment film was formed by applying a polyimide precursor solution (SE-7492 manufactured by Nissan Chemical Industries) on a glass substrate and baking it at 250 ° C.

  In the rubbing apparatus, the rubbing cloth was brought close to the alignment film while rotating the rubbing roller at a rotation speed of 1500 rpm, and the rubbing cloth was pressed against the surface of the alignment film from the surface to a thickness of 50%. %). In this state, the stage on which the substrate was mounted was moved in a fixed direction at a moving speed of 30 mm / sec to perform a rubbing process. After this rubbing treatment was performed on two substrates for one type of rubbing cloth, cells were formed by facing the alignment films so that the rubbing treatment direction was antiparallel (antiparallel). . Next, liquid crystal was sealed in the gap between the two substrates. The final gap of the liquid crystal cell was about 5 μm.

  The prepared liquid crystal cell was sandwiched between two polarizing plates, observed by transmitting light, and the alignment state of the liquid crystal was visually observed. At this time, compared with the intensity of light passing through a place other than the liquid crystal cell, the one having good light transmission is considered to have sufficient alignment performance (double circle), and the liquid crystal flows when the liquid crystal is enclosed. In the case where the trace remains or the transmitted light is observed although the alignment performance of the liquid crystal is weak, the case where the transmitted light is good (◯) and the case where the transmitted light is not observed at all is regarded as inferior (Δ).

  After the rubbing treatment, the alignment film on the substrate was observed on the alignment film and the edge of the alignment film with DIGITAL MICROSCOPE VHX-100 manufactured by Keyence Corporation. And when the scraps of fiber scraping are not seen at all on the alignment film or at the end of the alignment film, or several are seen (double circle), the scraps of fiber scraping are excellent on the alignment film or at the end of the alignment film. Although it can be seen, it is good (◯) when it is less than the rubbing cloth made of the piled raised cloth of Comparative Example 2, and the amount of scraped fiber scraps seen on the alignment film or at the edge of the alignment film is equal to or higher than that of Comparative Example 2. When there are too many, it was set as inferior (△).

  (Manufacturing method of polyethylene terephthalate (PET)): 0.03 weight of 85% aqueous solution of phosphoric acid as a coloring inhibitor is added to a low polymer obtained by ordinary esterification reaction from 166 parts by weight of terephthalic acid and 75 parts by weight of ethylene glycol. Part, 0.06 parts by weight of antimony trioxide as a polycondensation catalyst and 0.06 parts by weight of cobalt acetate tetrahydrate as a toning agent were added to carry out a polycondensation reaction, and a commonly used polyethylene terephthalate of IV0.66 ( Hereinafter, PET) pellets were obtained.

  (Production of polytrimethylene terephthalate (PTT)): 130 parts (6.7 mole parts) of dimethyl terephthalate, 114 parts (15 mole parts) of 1,3-propanediol, 0.24 parts of calcium acetate monohydrate ( 0.014 mol part), 0.1 part (0.01 mol part) of lithium acetate dihydrate, and the low polymer obtained by conducting the transesterification reaction while distilling off methanol, 0.065 part and 0.134 part of titanium tetrabutoxide were added, and polycondensation reaction was performed while distilling off 1,3-propanediol to obtain a chip-shaped prepolymer. The obtained prepolymer was further subjected to solid phase polymerization at 220 ° C. under a nitrogen stream to obtain pellets of polytrimethylene terephthalate (PTT) of IV1.16. When this PTT pellet was used for melt spinning, it was vacuum-dried at 150 ° C. for 10 hours.

  (Manufacture of warp 1): This PET pellet was vacuum-dried at 150 ° C. for 10 hours, and was an extruder type melt spinning machine equipped with a biaxial extruder (axial length L / axial diameter D = 35) at a spinning temperature of 280 ° C. A round hole-shaped die having a hole diameter of 0.20 mm and a hole number of 144 is installed, melt spinning is performed, and an aqueous treatment agent (concentration of 20% by weight of effective component) is applied so as to obtain an adhesion amount of 1% by weight as an effective component. ) Was attached, and melt spinning was performed at a take-up speed of 1500 m / min to obtain a wound yarn.

  When the multifilament obtained by winding is stretched, the yarn feeding speed of the yarn feeding roller is 320 m / min, the first roller is 80 ° C., the yarn feeding speed is 320 m / min, the second roller is 120 ° C., and the yarn feeding speed is 800 m. / Min, after the third roller was drawn and heat treated at room temperature at a yarn feed speed of 800 m / min, the yarn was cooled to below the glass transition temperature (Tg; 77 ° C.) of the polyester with a cold roller and wound up. A multifilament drawn yarn (warp yarn 1) having a round fiber cross section consisting of a multifilament fineness of 144 dtex, a filament count of 144, and a single fiber fineness of 1.00 dtex was obtained. The fiber physical properties of the warp 1 are shown in the column of the fabric 1 in Table 1.

  (Manufacture of the weft 1): In the manufacture of the warp 1 described above, fusion was performed in the same manner as the manufacture of the warp 1 except that a round hole-shaped die having a hole diameter of 0.30 mm and 48 holes was used. After spinning, drawing, and heat treatment, a multifilament drawn yarn (weft 1) having a round fiber cross section consisting of a multifilament fineness of 56 dtex, a number of filaments of 48, and a single fiber fineness of 1.17 dtex was obtained.

  (Manufacture of woven fabric 1): Using warp 1 and weft 1 (both flat yarns without crimps), warp with a warp filament count of 100 / cm and a weft filament count of 44 / cm 10 I made a sheet Akiko.

  (Manufacture of warps 2, 3, and 10): Extruder type compound melt spinning machine equipped with two twin-screw extruders (shaft length L / shaft diameter D = 35). PET has an island component and an average molecular weight of 1000 has a sea component. Using PEG copolymerized PET obtained by copolymerizing 15% by weight of polyethylene glycol (PEG), sea-island type composite fibers were performed (warp 2:36 islands × 8 holes, warp 3:70 islands × 35 holes), Alternatively, core-sheath composite spinning is performed (core: PET, sheath: PEG copolymer PET, core-sheath shape is 144 holes in the die shown in FIG. 2), and the spinning temperature is 275 ° C. The multifilament was wound up in the same manner as in 1. And about the multifilament obtained by winding, the drawing and the heat processing were performed by the method similar to the warp 1, and the multifilament drawn yarn was obtained, respectively. The obtained fibers were treated with a 1% aqueous sodium hydroxide solution to obtain warp 2, warp 3, and warp 10.

  (Manufacture of warps 4 to 9): In the manufacture of the warps 1 described above, the caps with the same number of holes as the filament counts shown in Table 1 (hole diameters are 0.30 mm (warps 4, 5, 7, 9),. 20 mm (warp yarns 6 and 8)) was used in the same manner as in the production of warp yarn 1, and after melt spinning, stretching, and heat treatment, the fiber cross section shown in Table 1 was round and the flat yarn multi Filament drawn yarn (warps 4-7, 9) was obtained. The warp 8 was obtained as a crimped yarn subjected to 100 T / m twist processing.

  (Manufacture of warps 11-14): In the manufacture of the warps 1 described above, the polymers shown in Table 1 (warps 11: polyethylene naphthalate HIPERTUF 90000 manufactured by M & G Polymers; hereinafter PEN, warps 12: PTT, warps 13: Toray stocks Company using polybutylene terephthalate type 1100SS; hereinafter PBT, warp 14: nylon 6 type 300 manufactured by Toray Industries, Inc., using a die with the same number of holes as the filament count (hole diameter is 0.20 mm), and the spinning temperature A fiber cross-section shown in Table 1 is obtained after melt spinning, stretching, and heat treatment in the same manner as in the production of warp 1 except that the temperature is 310 ° C. (warp 11) and 250 ° C. (warp 12, 13, 14). A round yarn multifilament drawn yarn (warp yarns 11 to 14) was obtained.

  (Manufacture of woven fabrics 2 to 14): When producing a warp satin woven fabric with 44 weft filaments / cm using weft 1 in the same manner as woven fabric 1, the above-mentioned warp yarns 2 to 14 are used. In addition, warp woven fabrics (woven fabrics 2 to 14) were prepared so as to have the kind of satin shown in Table 1, the number of warp filaments, and the number of single fibers of warp.

Examples 1 to 25 and Comparative Example 1
Fabrics 1 to 14 shown in Table 1 and foamed polyurethane type TB-QJH manufactured by Achilles Co., Ltd. having the characteristics shown in Table 2 and FIGS. 3 and 4 (characteristics are shown in FIG. 3. Examples 1 to 14 and 21 to 24, below. , Elastic body 1) and type ZF (characteristics are shown in FIG. 4. Examples 15 to 20 and 25, hereinafter, elastic body 2), and acrylate ester adhesive DICNAL K- manufactured by Dainippon Ink & Chemicals, Inc. 1500 (using 100% by weight of K-1500, 2% by weight of DICNAL VS-20 as a thickener, Examples 1 to 21 and 23 to 25, hereinafter referred to as adhesives), or using a frame laminating method Thus, the rubbing cloths of Examples 1 to 25 having the rubbing cloth thicknesses shown in Table 3 were obtained. Moreover, the rubbing cloth which does not provide an elastic body using the fabric 1 was made into the comparative example 1. Table 3 shows the evaluation results of orientation performance (orientation regulating force) and fiber shaving. Orientation performance and degree of fiber shaving change depending on the single fiber fineness, the type of polymer forming the fiber, the number of single fibers of warp and the type of satin fabric (Examples 1 to 14), and the type of elastic body and rubbing cloth It was found that the orientation performance and the degree of fiber scraping also changed depending on the thickness of the material and the method of bonding the elastic body and the satin fabric (Examples 15 to 25), but generally excellent or good results were obtained. On the other hand, in Comparative Example 1, fiber scraping hardly occurred, but since there was no elastic body, it was difficult to uniformly press the rubbing cloth against the alignment film, and alignment spots were generated.

Comparative Example 2
In Examples of Patent Document 2, No. 1 in Table 1 is used. Using the rayon brushed fabric described in No. 5, the orientation performance and fiber scraping were evaluated in the same manner as in Example 1. As in Comparative Example 1, no elastic body was provided. Although the orientation performance was good, the fiber was shaved a lot, and it was buried in the orientation film, and could not be removed by washing with pure water, and the fiber shaving was inferior.

It is explanatory drawing explaining the process of carrying out the rubbing process to the alignment film on a board | substrate using the rubbing cloth of embodiment of this invention. In the cross-sectional view of the single fiber of the core-sheath composite fiber (before leaching) for obtaining the four-leaf type irregular cross-section yarn having sharp protrusions, which is the basis of the fabric 10 used in Examples 10 and 19 of the present invention is there. It is a compression rate-stress measurement curve which shows the elastic characteristic of the elastic body 1 used in the Example of this invention. It is a compression rate-stress measurement curve which shows the elastic characteristic of the elastic body 2 used in the Example of this invention.

Explanation of symbols

  1: A rubbing roller.

  2: Elastic body.

3: Woven knitted fabric 4: Alignment film 5: Substrate 6: Sheath component (PEG copolymerized PET)
7: Core component (PET)

Claims (9)

A rubbing cloth in which a woven and knitted fabric and an elastic body are laminated and integrated. The rubbing cloth according to claim 1, wherein the woven or knitted fabric is a satin fabric. The rubbing cloth according to claim 1 or 2, wherein the fibers constituting the woven or knitted fabric are long fibers. The rubbing cloth according to any one of claims 2 to 3, wherein the number of single fibers of warp or weft which is a surface layer of the satin fabric is 2000 / cm or more. The rubbing cloth according to any one of claims 2 to 4, wherein the intersection of warp and weft of the satin fabric is repeated five or more times. The rubbing cloth according to any one of claims 2 to 5, wherein the single fiber fineness of the warp or weft which is a surface layer of the satin fabric is 2.0 dtex or less. The rubbing cloth according to any one of claims 2 to 6, wherein the warp or weft used as the surface layer of the satin fabric is made of polyester and / or polyamide. The rubbing cloth according to any one of claims 2 to 7, wherein the warp or weft which is the surface layer of the satin fabric is made of non-crimped fibers. Elasticity in which the ratio R (R = P2 / P1) of the stress (P1) at the time of 10% compression and the stress (P2) at the time of 50% compression in the thickness direction of the rubbing cloth is in the range of 0.90 ≦ R ≦ 2.00 The rubbing cloth according to any one of claims 1 to 8, wherein a body is used.

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