JP5543213B2 - Wiping products - Google Patents

Description

  The present invention relates to a fabric containing ultrafine fibers, a composite sheet using the fabric, and an abrasive cloth and a wiping product using the fabric or composite sheet.

Conventionally, fabrics containing ultrafine fibers have been widely used in fields such as abrasive cloths and wiping products.
The polishing cloth is often used to form fine grooves on the substrate surface of the recording disk (see, for example, Patent Document 2, Patent Document 3, and Patent Document 4). As the groove is more uniform and finer, the distance between the recording disk and the magnetic head can be reduced, so that the capacity and storage density of the magnetic disk and the like can be increased.
Further, wiping products such as a wiping cloth and a wiping tape are used for cleaning applications, glasses wiping applications, IC and semiconductor industrial applications, lens wiping applications, and the like (for example, Patent Document 1, Patent Document 5, Patent Document). 6, see Patent Literature 7 and Patent Literature 8). As such wiping products, wiping products containing natural fibers, wiping products made of nonwoven fabric, wiping products using polyester filaments, and the like are known.
However, the wiping product containing natural fibers has a problem that fluff falls on the surface of the object to be wiped and generates dust. Moreover, in the wiping product made of a non-woven fabric, there has been a problem that fibers dropped from the non-woven fabric fall on the surface of the object to be wiped and generate dust. In addition, in wiping products using polyester filaments, the matting agent contained in normal polyester falls on the surface of the object to be wiped, resulting in problems such as the matting agent itself becoming dust, and the surface of the object to be wiped. There was a problem of being hurt.
JP 2006-336118 A JP 2007-308821 A JP 2001-179595 A JP 2005-329534 A Japanese Patent Laid-Open No. 61-228821 JP 2005-160721 A Japanese Patent Laid-Open No. 11-152644 JP 2006-336118 A

The object of the present invention is to be used as a cloth for a polishing cloth capable of forming fine grooves on the object to be polished while reducing the occurrence rate of defects (scratches) on the surface of the object to be polished. An object of the present invention is to provide a fabric that can be used as a fabric for a wiping product having good properties and little dust generation, a composite sheet using the fabric, and an abrasive cloth and a wiping product using the fabric. The above objects can be achieved by the fabric and composite sheet, abrasive cloth and wiping product of the present invention.
The present invention relates to a polyester multifilament A having a single fiber diameter of 50 to 1500 nm and a number of filaments of 1000 or more, and a matting agent content, which is made of polyester having a matting agent content of 0.5% by weight or less. A polyester multifilament B having a single fiber diameter of 3 μm or more, which is made of a polyester of 0.5 wt% or less, is included in the fabric as a composite yarn, and in the composite yarn, the yarn length DA of the polyester multifilament A and the polyester multifilament A wiping product using a fabric characterized in that the ratio DA / DB to the yarn length DB of B is 1.05 or more.
Here, the polyester multifilament A is preferably a multifilament obtained by dissolving and removing a sea component of a sea-island composite fiber composed of a sea component and an island component. Moreover, it is preferable that the number of filaments of the said polyester multifilament B exists in the range of 10-300.
In the fabric of the present invention, the fabric is a woven fabric containing the composite yarn, and in the woven fabric structure of the woven fabric, the composite yarn is preferably included as a warp-floating component and / or a weft-floating component having two or more floats. . Moreover, it is preferable that the fabric is a woven fabric and the cover factor CF of the woven fabric is in the range of 1500 to 4500. Moreover, it is preferable that the thickness of a fabric exists in the range of 0.10-0.80 mm. Moreover, it is preferable that the compression rigidity of the fabric measured by the KES texture measuring instrument is in the range of 0.08 to 0.9. Moreover, it is preferable that the hydrophilizing agent adheres to the fabric in the range of 0.2 to 10.0% by weight with respect to the weight of the fabric. In that case, it is preferable that the water absorption rate measured by JISL1096-1998 6.26.1 dropping method is 10 seconds or less. Moreover, it is preferable that both the elongation in the warp direction and the elongation in the weft direction of the fabric are 200% or less.
Moreover, according to this invention, the wiping product formed using the composite sheet | seat which bonds the sheet | seat which consists of an organic material to the said fabric is provided.
Here, the thickness of the sheet made of an organic material is preferably in the range of 20 to 500 μm. The sheet made of an organic material is preferably made of a porous foam . Advantages of the Invention According to the present invention, it can be used as a cloth for a polishing cloth capable of forming fine grooves in a workpiece while reducing the occurrence rate of defects (scratches) on the surface of the workpiece, Also provided are a fabric that can be used as a fabric for wiping products with good wiping properties and little dust generation, a composite sheet using the fabric, and an abrasive fabric and a wiping product using the fabric. The

FIG. 1 is a schematic view showing an example of a spinneret that can be used for spinning sea-island type composite fibers in the present invention.
FIG. 2 is a schematic view showing another example of a spinneret that can be used for spinning sea-island type composite fibers in the present invention.
1 is an island component polymer reservoir portion before distribution, 2 is an island component distribution introduction hole, 3 is an ocean component introduction hole, 4 is an ocean component polymer reservoir portion before distribution, 5 is an individual sea / island ( = Sheath / Core) Structure forming part, 6 is a confluence throttle part of the whole sea island.
FIG. 3 is a schematic diagram of a compression characteristic curve obtained by a KES texture measuring instrument.

First, in the fabric of the present invention, the polyester multifilament A has a single fiber diameter (single fiber diameter) in the range of 50 to 1500 nm (preferably 100 to 1000 nm, more preferably 400 to 800 nm, particularly preferably 520 to 800 nm). It is important to be within. When such a single fiber diameter is converted into a single yarn fineness, it corresponds to 0.00002 to 0.022 dtex. Here, when the single fiber diameter is less than 50 nm, not only the production becomes difficult, but also the fiber strength is lowered, which is not practically preferable. Conversely, when the single fiber diameter exceeds 1500 nm, it is not preferable because fine grooves cannot be formed on the object to be polished when the fabric is used as a polishing cloth. Moreover, when a single fiber diameter exceeds 1500 nm, when using a fabric as a fabric for wiping products, sufficient wiping property cannot be obtained, which is not preferable. In addition, when the cross-sectional shape of the single fiber is an atypical cross section other than the round cross section, the diameter of the circumscribed circle is defined as the single fiber diameter. The single fiber diameter can be measured by photographing the cross section of the fiber with a transmission electron microscope.
In the polyester multifilament A, the number of filaments is not particularly limited, but is preferably 1000 or more (more preferably 2000 to 20000, particularly preferably 2000 to 10,000). The total fineness of the polyester multifilament A (the product of the single fiber fineness and the number of filaments) is preferably in the range of 5 to 200 dtex.
The polymer forming the polyester multifilament A is a polyester having a matting agent content of 0.5% by weight or less (more preferably 0.1% by weight or less, particularly preferably 0% by weight) relative to the weight of the polyester. Is essential. When the matting agent is contained in the polyester in an amount of more than 0.5% by weight with respect to the polyester weight, when the cloth is used as a cloth for a polishing cloth, the object to be polished is polished when the polishing object is polished with the polishing cloth. It is not preferable because defects (scratches) are likely to occur on the surface. Further, when the matting agent is contained in the polyester in an amount of more than 0.5% by weight relative to the weight of the polyester, when the fabric is used as a fabric for a wiping product, the matting agent particles contained in the fibers constituting the fabric Due to the friction between the object to be wiped and the fibers, it may fall on the surface of the object, the matting agent itself may become dust, and the object may be scratched.
Examples of the polyester that forms the polyester multifilament A include polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, stereocomplex polylactic acid, polylactic acid, and polyester obtained by copolymerizing a third component. The In addition, the matting agent as used in the field of this invention is titanium dioxide, and titanium dioxide is 1 type of an inorganic fine particle. The content of such titanium dioxide can be measured by a method using fluorescent X-rays (for example, ZSX100e manufactured by Rigaku Electric Industry Co., Ltd.) or a method of dissolving polyester using a solvent.
The polymer may contain one or more cationic dyes, colorants, and heat stabilizers as necessary within the range not impairing the object of the present invention. It is preferable that inorganic fine particles are not contained.
The fiber form of the polyester multifilament A is not particularly limited. For example, the polyester multifilament A may be subjected to normal air processing and false twist crimp processing.
On the other hand, it is important that the polyester multifilament B has a single fiber diameter of 3 μm or more (preferably 3 to 30 μm). If the single fiber diameter is smaller than 3 μm, the compressive stiffness of the fabric becomes small, and therefore, when the fabric is used as a fabric for polishing cloth, defects (scratches) on the surface of the object to be polished are likely to occur, which is not preferable. On the other hand, if the single fiber diameter is smaller than 3 μm, when the fabric is used as a fabric for wiping products, the surface of the fabric may become flat and the wiping property may be impaired. Here, when the cross-sectional shape of the single fiber is an atypical cross section other than the round cross section, the diameter of the circumscribed circle is defined as the single fiber diameter. The single fiber diameter can be measured by photographing the cross section of the fiber with a transmission electron microscope, as described above.
In the polyester multifilament B, the number of filaments is not particularly limited, but is preferably in the range of 10 to 300 (preferably 30 to 150). The fiber form of the polyester multifilament B is not particularly limited, but is preferably a long fiber (multifilament yarn). The cross-sectional shape of the single fiber is not particularly limited, and may be a known cross-sectional shape such as a circle, a triangle, a flat shape, or a hollow shape. The polyester multifilament B may be subjected to normal air processing or false twist crimp processing. In particular, when the polyester multifilament B is a false twist crimped yarn, when the cloth is used as a cloth for an abrasive cloth, the cushioning property of the cloth is improved, so that the defect (scratch) occurrence rate is reduced. Moreover, when the said polyester multifilament B is false twist crimped yarn, when using a fabric as a cloth for wiping products, wiping performance improves and it is preferable. The crimp rate of the false twist crimped yarn is preferably in the range of 4 to 30%.
The polymer forming the polyester multifilament B is a polyester having a matting agent content of 0.5% by weight or less (more preferably 0.1% by weight or less, particularly preferably 0% by weight) relative to the weight of the polyester. Is essential. When the matting agent is contained in the polyester in an amount of more than 0.5% by weight with respect to the polyester weight, when the cloth is used as a cloth for a polishing cloth, the object to be polished is polished when the polishing object is polished with the polishing cloth. It is not preferable because defects (scratches) are likely to occur on the surface. Further, when the matting agent is contained in the polyester in an amount of more than 0.5% by weight relative to the weight of the polyester, when the fabric is used as a fabric for a wiping product, the matting agent particles contained in the fibers constituting the fabric Due to the friction between the object to be wiped and the fibers, it may fall on the surface of the object, the matting agent itself may become dust, and the object may be scratched.
The type of polyester forming the polyester multifilament B is not particularly limited as long as it is a polyester polymer. Polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, stereocomplex polylactic acid, polylactic acid, third component Preferred examples include polyesters obtained by copolymerization of Such polyester may be material recycled or chemically recycled polyester. Furthermore, the polyester obtained using the catalyst containing the specific phosphorus compound and titanium compound which are described in Unexamined-Japanese-Patent No. 2004-270097 and 2004-21268 may be sufficient. In particular, a copolymerized polyester is particularly preferable in that it has a high boiling water shrinkage as described later. The polymer may contain one or more cationic dyes, dyeing agents, and heat stabilizers as necessary within the range not impairing the object of the present invention. It is preferable that fine particles are not contained.
The polyester multifilament A and the polyester multifilament B are preferably contained in the fabric as a composite yarn. When such a composite yarn is contained in a cloth, the polishing performance can be improved when the cloth is used as a cloth for a polishing cloth. Moreover, when such a composite yarn is contained in a fabric, when the fabric is used as a fabric for a wiping product, the wiping performance can be improved. At that time, examples of the composite method of the polyester multifilament A and the polyester multifilament B include interlace air processing, alignment false twist crimping, and covering processing. Among these, interlaced air processing is preferable for forming a clear core-sheath structure. In the composite yarn, the ratio DA / DB between the yarn length DA of the polyester multifilament A and the yarn length DB of the polyester multifilament B contained in the composite yarn is 1.05 or more (preferably 1.1 to 1. 4) is preferred. When the ratio DA / DB is 1.05 or more, the polishing performance can be improved when the fabric is used as a polishing cloth. Moreover, when this ratio DA / DB is 1.05 or more, when this fabric is used as a fabric for wiping products, the wiping performance can be improved. On the other hand, when the ratio DA / DB is larger than 1.4, there is a possibility that the processability when producing the fabric is lowered.
The fabric structure of the fabric of the present invention is not limited, and may be a woven fabric or a knitted fabric.
The structure of the woven fabric is not particularly limited, and may be woven by a normal method. The number of layers may be a single layer or a multilayer of two or more layers. For example, as the weaving structure, a plain weaving, oblique weaving, satin weaving, etc., three-fold structure, changing structure, changing weaving texture, etc., weft double weaving, weft double weaving, etc. Examples are velvet. Especially, the woven structure | tissue in which the composite yarn comprised by the said polyester multifilament A and the polyester multifilament B floats and is contained as a warp float component and / or a weft float component with two or more is preferable. Specifically, a twill texture or a satin texture (a satin texture) is preferable. For example, in the case of a 4/1 five-sheet satin woven structure, a weft float component having four floats is included in the woven structure.
When the woven structure is a twill woven structure or a satin woven structure, when the cloth is used as a cloth for a polishing cloth, defects (scratches) on the surface of the object to be polished can be reduced. That is, the float of the floating yarn of the structure is increased, and a greatly depressed intersection (structure point) is formed by the warp and the weft, and scraps from the polishing can be collected at this intersection. Can be reduced. If the woven structure is a plain woven structure, the dents at the intersections are not sufficient, and defects (scratches) on the surface of the workpiece may easily occur.
In addition, it is preferable that the woven structure is a twill woven structure or a satin woven structure when the cloth is used as a cloth for a wiping product because the wiping property can be improved. That is, since the float of the floating yarn of the structure becomes high, an intersection (structure point) that is greatly hollowed by the warp and the weft is formed, and it is excellent because it can collect minute dust or oil and fat wiped at this hollow intersection. Wiping and collecting properties can be obtained. When the woven structure is a plain weave, there is a possibility that the indentation at the intersection may not be sufficient.
When the fabric is a woven fabric, the polyester multifilament A is arranged as a single yarn, or as a composite yarn of the polyester multifilament A and other yarns, only on one of the warp and weft of the fabric, and on the other Is preferably provided with the polyester multifilament B. Adopting such a configuration increases the gap in the fabric and improves the cushioning property of the fabric, so that not only fine grooves can be formed in the object to be polished, but also the occurrence of defects (scratches) can be reduced. preferable. At that time, as the cushioning property, the compression stiffness by the KES texture measuring instrument is in the range of 0.08 to 0.9 (more preferably 0.1 to 0.7). It is preferable for reducing the occurrence rate of defects (scratches). Here, the compression stiffness is a substitute characteristic of cushioning properties. The larger the numerical value, the higher the cushioning property, and the smaller the numerical value, the smaller the cushioning property. As the compressive stiffness (cushioning property) of the fabric increases, it is not yet clarified why not only fine grooves can be formed on the object to be polished but also the occurrence of defects (scratches) can be reduced. However, it is presumed that even if a foreign substance causing a defect (scratch) adheres to the surface of the fabric, the influence is reduced by the cushioning property of the fabric. When the polyester multifilament A is arranged on both the warp and the weft of the woven fabric, when the fabric is used as a cloth for an abrasive cloth, the cushioning property of the woven fabric is lowered, and the defect (scratch) occurrence rate may be increased. .
Further, when the fabric is a woven fabric, the cover factor CF of the woven fabric is preferably in the range of 1500 to 4500 (more preferably 2300 to 4000). When the cover factor CF of the woven fabric is within the above range, it is preferable that a fine groove can be formed in an object to be polished when the fabric is used for an abrasive cloth. Moreover, it is preferable that the cover factor CF of the woven fabric is within the above range since the wiping performance is improved when the fabric is used as a fabric for wiping products. When the cover factor CF of the woven fabric is less than 1500, when an abrasive is applied to the woven fabric for polishing cloth, the dispersibility becomes insufficient, and it may be difficult to form fine grooves on the object to be polished. Further, when the fabric cover factor CF is less than 1500, the fabric has low rigidity, and therefore, when the fabric is used as a fabric for a wiping product, workability may be reduced. If the cover factor CF of the woven fabric is larger than 4500, the rigidity becomes too high and it may be difficult to form fine grooves in the workpiece. On the other hand, if the cover factor CF of the fabric is larger than 4500, the rigidity becomes too high and the wiping performance may be lowered. The cover factor CF in the present invention is represented by the following formula.
CF = (DWp / 1.1) ^1/2 × MWp + (DWf / 1.1) ^1/2 × MWf
However, DWp is the total warp fineness (dtex), MWp is the warp weave density (main / 2.54 cm), DWf is the total weft fineness (dtex), and MWf is the weft weave density (main / 2.54 cm).
When the fabric of the present invention is a knitted fabric, the knitted fabric structure is not particularly limited, and may be knitted by a normal method. The number of layers may be a single layer or a multilayer of two or more layers. For example, the knitting organization includes flat knitting, rubber knitting, double-sided knitting, pearl knitting, tuck knitting, float knitting, one-side knitting, lace knitting, splicing knitting, single denby knitting, single atlas knitting, double cord knitting, half tricot Knitting, back hair knitting, jacquard knitting and the like are preferably exemplified.
The fabric of the present invention is preferably composed only of the polyester multifilament A and the polyester multifilament B. However, other fibers may be included as long as the fabric weight is 30% by weight or less.
In the fabric of the present invention, the thickness is preferably in the range of 0.10 to 0.80 mm (more preferably 0.17 to 0.60 mm). When the thickness is less than 0.10 mm, when the fabric is used as a polishing cloth, the cushioning property is lowered and a defect (scratch) may be easily generated on the surface of the object to be polished. On the other hand, when the thickness is less than 0.10 mm, when the fabric is used as a fabric for wiping products, the stiffness of the fabric may be lowered and workability may be impaired. On the other hand, when the thickness is larger than 0.80 mm, workability may be reduced when the fabric is used as a polishing cloth. On the other hand, if the thickness is larger than 0.80 mm, when the fabric is used as a fabric for wiping products, the rigidity becomes too high and the wiping property may be lowered.
The fabric can be manufactured by the following manufacturing method. That is, for polyester multifilament A, it is a sea-island type composite fiber formed of an island component and a sea component, and the island component has a matting agent content of 0.5% by weight or less (more preferably). 0.1% by weight or less, particularly preferably 0% by weight) of polyester and the diameter of the island component is 50-1500 nm (preferably 100-1000 nm, more preferably 400-800 nm, particularly preferably 520-800 nm). On the other hand, the content of the matting agent is 0.5% by weight or less (more preferably 0.1% by weight or less, particularly preferably 0% by weight) with respect to the weight of the polyester for the multifilament B polyester. The fabric is knitted using polyester multifilaments made of a polyester and having a single fiber diameter of 3 μm or more. After, the sea component of the sea-island type composite fiber by dissolving removed with an aqueous alkaline solution can be produced the fabric.
Here, in the above-mentioned sea-island type composite fiber, the polymer constituting the fiber is arbitrary as long as the sea component polymer is a combination having higher solubility than the island component polymer. In particular, the dissolution rate ratio (sea / island) Is preferably 200 or more. When the dissolution rate ratio is less than 200, part of the island component of the fiber cross-section surface layer portion is dissolved while the sea component of the fiber cross-section central portion is dissolved, so the sea component is completely dissolved and removed. For this reason, the island component is reduced by a percentage, and strength deterioration due to the thickness variation of the island component and solvent erosion occurs, and problems such as fluff and pilling are likely to occur.
The sea component polymer may be any polymer as long as the dissolution rate ratio with respect to the island component is 200 or more, but polyesters, polyamides, polystyrenes, polyethylenes, and the like having good fiber forming properties are particularly preferable. For example, as an easily soluble polymer in an alkaline aqueous solution, polylactic acid, an ultra-high molecular weight polyalkylene oxide condensation polymer, a polyethylene glycol compound copolymer polyester, a copolymer polyester of polyethylene glycol compound and 5-sodium sulfonic acid isophthalic acid may be used. Is preferred. Nylon 6 is soluble in formic acid, and polystyrene and polyethylene are very well soluble in organic solvents such as toluene. Among them, in order to achieve both easy alkali solubility and sea-island cross-section formability, the polyester-based polymer is 3 to 10 weight percent of polyethylene glycol having 6 to 12 mol% of 5-sodium sulfoisophthalic acid and a molecular weight of 4000 to 12000. % Copolymerized polyethylene terephthalate copolymer polyester having an intrinsic viscosity of 0.4 to 0.6 is preferred. Here, 5-sodium isophthalic acid contributes to improving hydrophilicity and melt viscosity, and polyethylene glycol (PEG) improves hydrophilicity. PEG has a higher hydrophilicity effect, which is thought to be due to its higher order structure, as the molecular weight increases, but it is preferable from the viewpoints of heat resistance and spinning stability because the reactivity becomes poor and a blend system is formed. Disappear. On the other hand, when the copolymerization amount is 10% by weight or more, it is difficult to achieve the object of the present invention because of its inherently low melt viscosity. Therefore, it is preferable to copolymerize both components within the above range.
On the other hand, the island component polymer is a polyester having a matting agent content of 0.5% by weight or less (more preferably 0.1% by weight or less, particularly preferably 0% by weight) relative to the weight of the polyester, Any polyester polymer may be used as long as there is a difference in dissolution rate. However, as described above, fiber-forming polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polylactic acid, polyester obtained by copolymerizing the third component, etc. Polyester is preferred. The polymer may contain one or more cationic dyes, dyeing agents, and heat stabilizers as necessary within the range not impairing the object of the present invention. It is preferable that fine particles are not contained.
In the sea-island type composite fiber of the present invention comprising the sea component polymer and the island component polymer, the melt viscosity of the sea component during melt spinning is preferably larger than the melt viscosity of the island component polymer. In such a relationship, even if the composite weight ratio of the sea component is less than 40%, the islands are joined together, or the majority of the island components are joined to be different from the sea-island type composite fiber. hard.
A preferred melt viscosity ratio (sea / island) is in the range of 1.1 to 2.0, especially 1.3 to 1.5. If this ratio is less than 1.1 times, the island components are likely to be joined during melt spinning, whereas if it exceeds 2.0 times, the viscosity difference is too large and the spinning tone tends to be lowered.
Next, the larger the number of islands, the higher the productivity when manufacturing and manufacturing ultrafine fibers by dissolving and removing sea components, and the fineness of the resulting ultrafine fibers becomes remarkable, forming fine grooves in the object to be polished. Therefore, it is preferably 100 or more (more preferably 300 to 1000). If the number of islands is too large, not only the production cost of the spinneret increases, but also the processing accuracy itself tends to decrease.
Next, the diameter of the island component needs to be in the range of 50 to 1500 nm (preferably 100 to 1000 nm, more preferably 400 to 800 nm, particularly preferably 520 to 800 nm). Further, each island in the cross section of the sea-island composite fiber is more preferable as the diameter thereof is uniform because the quality and durability of a woven fabric made of ultrafine multifilament yarn obtained by removing sea components is improved.
In the sea-island composite fiber, the sea-island composite weight ratio (sea: island) is preferably in the range of 40:60 to 5:95, and particularly preferably in the range of 30:70 to 10:90. Within such a range, the thickness of the sea component between the islands can be reduced, the sea component can be easily dissolved and removed, and the conversion of the island component into ultrafine fibers is facilitated. Here, when the proportion of the sea component exceeds 40%, the thickness of the sea component becomes too thick. On the other hand, when the proportion is less than 5%, the amount of the sea component becomes too small, and joining between the islands easily occurs.
In the sea-island type composite fiber, the thickness of the sea component between the islands is preferably 500 nm or less, particularly preferably in the range of 20 to 200 nm. When the thickness exceeds 500 nm, the dissolution of the island component proceeds while dissolving and removing the thick sea component, so that not only the homogeneity between the island components decreases, but also defects such as fuzz and pilling during wearing Dye spots are also likely to occur.
The sea-island type composite fiber can be easily produced, for example, by the following method. That is, first, a polymer having a high melt viscosity and an easily soluble polymer and a polymer having a low melt viscosity and a hardly soluble polymer are melt-spun so that the former is a sea component and the latter is an island component. Here, the relationship between the melt viscosity of the sea component and the island component is important.If the ratio of the sea component decreases and the thickness between the islands decreases, if the melt viscosity of the sea component is small, some of the flow paths between the islands This is not preferable because sea components flow at high speed and joining between islands easily occurs.
As the spinneret used for melt spinning, any one such as a hollow pin group for forming an island component or a group having a fine hole group can be used. For example, any spinneret that forms a cross section of the sea island by joining the island component extruded from the hollow pin or the fine hole and the sea component flow designed to fill the gap between the sea component flow may be used. . Examples of spinnerets that are preferably used are shown in FIGS. 1 and 2, but are not necessarily limited thereto. FIG. 1 shows a method in which hollow pins are discharged into the sea component resin reservoir portion and merged and compressed. FIG. 2 shows a method in which islands are formed by a fine hole method instead of hollow pins.
The discharged sea-island type composite fiber is solidified by cooling air, and is preferably wound after being melt-spun at 400 to 6000 m / min. The obtained undrawn yarn is made into a composite fiber having desired strength, elongation, and heat shrinkage properties through a separate drawing process, or is taken up by a roller at a constant speed without being wound once, and subsequently drawn. Any of the methods of winding after passing through may be used.
Here, the stretching process is preferably a normal roller stretching process. In addition, in order to produce a sea-island type composite fiber having a particularly fine island diameter with high efficiency, the fiber diameter is not changed prior to neck stretching (orientation crystallization stretching) with ordinary so-called orientation crystallization without changing the fiber structure. You may employ | adopt the fluid drawing process which makes only ultrafine. In order to facilitate fluid drawing, it is preferable to preheat the fiber uniformly using an aqueous medium having a large heat capacity and draw at a low speed. By doing so, it becomes easy to form a fluid state at the time of stretching, and it can be easily stretched without development of the fine structure of the fiber. In this process, both the sea component and the island component are preferably polymers having a glass transition temperature of 100 ° C. or less, and particularly suitable for polyesters such as polyethylene terephthalate, polybutylene terephthalate, polylactic acid, and polytrimethylene terephthalate. Specifically, it is immersed in a hot water bath in the range of 60 to 100 ° C., preferably 60 to 80 ° C., and uniformly heated, the draw ratio is 10 to 30 times, the supply speed is 1 to 10 m / min, and the winding speed is It is preferable to carry out in the range of 300 m / min or less, particularly 10 to 300 m / min. If the preheating temperature is insufficient and the stretching speed is too high, the desired high-magnification stretching cannot be achieved.
The drawn yarn drawn in the fluidized state is oriented, crystallized and drawn at a temperature of 60 to 220 ° C. in accordance with a conventional method in order to improve mechanical properties such as the strength and elongation. If the drawing conditions are outside this range, the properties of the resulting fiber will be insufficient. The draw ratio varies depending on the melt spinning conditions, flow stretching conditions, orientation crystallization stretching conditions, etc., but is 0.6 to 0.95 times the maximum draw ratio that can be stretched under the orientation crystallization stretching conditions. What is necessary is just to extend | stretch.
After producing a fabric using the above-described sea-island type composite fiber (sea-island type composite drawn yarn) and the polyester multifilament B, the sea component of the sea-island type composite fiber is dissolved and removed with an alkaline aqueous solution. Fabric is obtained. Various processes such as a dyeing process and a hydrophilic process may be additionally applied before and / or after the sea component dissolution and removal process using the alkaline aqueous solution.
Since the fabric thus obtained contains the polyester multifilament A and the polyester multifilament B, when used as a fabric for polishing cloth, the surface to be polished is reduced while reducing the occurrence rate of defects (scratches) on the surface of the object to be polished. It becomes possible to form fine grooves in the object. Moreover, when this fabric is used as a fabric for wiping products, it is possible to improve wiping and reduce dust generation. At that time, it is preferable that excellent wipeability is obtained when the friction coefficient measured with a KES texture measuring instrument is in the range of 0.4 to 0.9 on the front surface and / or back surface of the fabric.
In the fabric thus obtained, if the elongation in the warp direction and the elongation in the weft direction are both 200% or less, when the fabric is used as a fabric for polishing cloth, the defect (scratch) occurrence rate of the surface of the workpiece is reduced. It is possible to form fine grooves in the object to be polished while reducing the thickness, which is preferable.
In addition, when a hydrophilizing agent is adhered to the cloth in a range of 0.2 to 10.0% by weight with respect to the weight of the cloth, when the cloth is used as a cloth for an abrasive cloth, defects on the surface of the object to be polished ( It is preferable because it is possible to form fine grooves in the workpiece while reducing the occurrence rate of scratches.
As the hydrophilic agent, any hydrophilic agent having an affinity for the constituent fibers can be used. In particular, a hydrophilic polymer having affinity for polyester fibers is preferably used. For example, a block copolymer obtained by block copolymerization of polyethylene glycol diacrylate and derivatives thereof, polyalkylene glycol (polyethylene glycol, polypropylene glycol, etc.), terephthalic acid and / or isophthalic acid and lower alkylene glycol (ethylene glycol, etc.) Etc. are preferably exemplified. At that time, only one type of hydrophilic agent may be used, or two or more types of hydrophilic agents may be used in combination. The method for applying the hydrophilic agent is not particularly limited, and examples thereof include dyeing and bathing, padding, flat screen printing, rotary screen printing, roller printing, gravure roll, kiss roll, and foam processing methods. Illustrated.
Here, the water absorption rate measured by JIS L1096-1998 6.26.1 drop method is 10 seconds or less (more preferably 7 seconds or less) in order to efficiently form fine grooves on the object to be polished. preferable. When the water absorption rate is 10 seconds or more, when an abrasive is applied to the cloth for polishing cloth, the diffusibility becomes insufficient, and it may be difficult to form fine grooves on the object to be polished.
In addition, if a composite sheet in which a sheet made of an organic material is bonded to the cloth is used as a composite sheet for an abrasive cloth, the rigidity of the sheet can be increased, thus reducing the incidence of defects (scratches) on the surface of the object to be polished. Therefore, it is possible to form a fine groove in the object to be polished.
In that case, it is preferable that the thickness of the said sheet | seat which consists of organic materials exists in the range of 20-500 micrometers. Examples of the organic material include polyurethane resin, polyester resin, and nylon resin. In particular, a porous foam made of a polyurethane resin is preferred.
Moreover, the method of bonding the sheet | seat which consists of organic materials to the said fabric is not specifically limited, The method of using a lamination method (thermal-bonding method) or an adhesive agent may be sufficient.
The abrasive cloth of the present invention is an abrasive cloth formed using the cloth or the composite sheet. Such polishing cloths include polishing cloths for recording media such as magnetic disks and optical disks, polishing cloths for polishing recording media, polishing cloths for finishing electronic parts, and polishing cloths for buffing electronic parts. . According to such polishing cloth, it is possible to form fine grooves in the object to be polished, and to reduce the occurrence rate of defects (scratches) on the surface of the object to be polished.
Moreover, the wiping product of the present invention is a wiping product using the fabric or the composite sheet. Such wiping products include mobile phones, eyeglasses, lenses, liquid crystal materials, large-scale integrated circuits, electronic information materials, electronic devices, pharmaceuticals, medical instruments, pearls, jewelry, furniture, automobile parts, etc. Product included. Such a wiping product is extremely excellent in wiping property and dust collection property, and generates little dust. The shape of the wiping product is not particularly limited, and may be any of a wiping cloth, a wiping tape, a mascot-shaped mobile strap, and the like.

Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.
(1) Single fiber diameter
It was measured by taking a cross section of the fiber with a transmission electron microscope. Measurement was made with n number of 5, and the average value was obtained.
(2) Cover factor CF
The cover factor CF was calculated by the following formula.
CF = (DWp / 1.1) ^1/2 × MWp + (DWf / 1.1) ^1/2 × MWf
However, DWp is the total warp fineness (dtex), MWp is the warp weave density (main / 2.54 cm), DWf is the total weft fineness (dtex), and MWf is the weft weave density (main / 2.54 cm).
(3) Thickness of fabric
The thickness of the fabric was measured according to JIS L 1096 8.5.
(4) Polishing effect
The polishing effect was judged by the number of defects on the disk surface after texturing. The number of defects such as scratches was measured using a Candela OSA6100 optical surface analyzer for 10 disk substrates in the texture processing test. At that time, an average value of 10 measured values was calculated, and it was determined as “good” when 100 points or less, “normal” when 101 points or more and 300 points or less, and “bad” when 301 points or more.
(5) Coefficient of friction
The coefficient of friction was measured according to the surface property measurement method using a KES texture measuring instrument.
(6) Surface roughness
The surface roughness was measured according to the surface property measurement method using a KES texture measuring instrument.
(7) Measurement of yarn length
The composite yarn was taken out from the fabric and cut into a length of 30 cm (n number = 5). Next, one polyester multifilament A and one polyester multifilament B are taken out from the composite yarn one by one and a load of 1.76 mN / dtex (200 mg / de) is applied to the yarn length DA (mm) of the polyester multifilament A, polyester The yarn length DB (mm) of the multifilament B was measured. Then, (average value of yarn length DA) / (average value of yarn length DB) was defined as DA / DB.
(8) Wiping performance
A fixed amount of artificial dirt (carbon black, beef tallow extremely hardened oil and liquid paraffin hexane dilution) was dropped onto a glass plate, and air-dried at room temperature for 1 hour or more to attach spot-like dirt. After that, pressing load 40gr / cm with wiping cloth against glass plate ² (39.2 cN / cm ² The wiping operation was performed at a wiping speed of 10 cm / min. Five testers performed sensory evaluation about the glass plate after wiping off. At that time, the condition when the examiner looks at the glass plate is evaluated according to the following criteria, and 20 points or more are “good”, 11 to 19 points are “normal”, 10 points or less. It was determined as “bad”.
5 points: The glass plate is not very dirty and very clean.
4 points: The glass plate is clean and hardly feels dirty.
3 points: The glass plate is slightly dirty but is a little clean.
2 points: It is speculated that the glass plate would have been dirty, and it was a little dirty.
1 point: The glass plate is so dirty that it can be confirmed that the glass plate is dirty.
(9) Dust generation
In the evaluation method of wiping performance, a wiping operation was performed on a glass plate to which no artificial dirt was adhered using the wiping cloth under the same conditions. Five testers performed sensory evaluation about the glass plate after wiping off. The state when the examiner saw the glass plate was evaluated according to the following criteria. When the number of people who passed was 4 or more, it was judged as “good”, and when it was less than 4 people, it was judged as “bad”.
Pass: The fiber and dust are not attached to the glass plate and pass.
Fail: The fiber or dust adheres to the glass plate and is rejected.
(10) Elongation
The elongation of the fabric was measured according to JIS L 1096 8.12.
(11) Crimp rate
The test filament yarn was wound around a measuring machine having a circumference of 1.125 m to prepare a skein having a dryness of 3333 dtex.
The skein is suspended from a hanging nail of the scale plate, an initial load of 6 grf (5.9 cN) is applied to the lower part thereof, a heavy load of 600 grf (588 cN) is further applied, and the skein length L0 after 1 minute. Was measured. Immediately thereafter, the heavy load is removed from the skein, removed from the hanging nail of the scale plate, and this skein is immersed in boiling water for 20 minutes to develop crimps. The skein after the boiling water treatment was taken out from the boiling water, the moisture contained in the skein was absorbed and removed with a filter paper, and air-dried at room temperature for 24 hours. This air-dried skein is suspended from a hanging nail of the scale plate, a heavy load of 600 grf (588 cN) is applied to the lower part thereof, a length L1 of the skein is measured after 1 minute, and then the heavy load is removed from the skein. The skein length L2 was measured after 1 minute. The initial load was always applied during the measurement. The crimp rate (CP) of the test filament yarn was calculated by the following formula.
CP (%) = ((L1-L2) / L0) × 100
(12) Compression stiffness
As a substitute characteristic of the cushioning property, the compression stiffness was calculated from the area of the triangle ABC, the area of a, and the area of b obtained from the curve (FIG. 3) in the compression characteristic by the KES texture measuring instrument by the following formula.
Compression stiffness = (area of a + area of b) / area of triangle ABC
(13) Water absorption speed
It measured according to JIS L 1096-1998 6.26.1 (drop method).
(14) Adherence amount of hydrophilizing agent
The adhesion amount of the hydrophilizing agent was calculated by the following formula.
Adhering amount (%) of hydrophilizing agent = (weight of hydrophilizing agent adhering to fabric (gr) / weight of fabric before adhering (gr)) × 100
[Example 1]
Polyethylene terephthalate containing no matting agent (titanium dioxide) as an island component and no inorganic fine particles other than the matting agent, 9% by weight of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component Using a polyethylene terephthalate copolymerized, a sea-island type composite unstretched fiber with sea: islands = 30: 70 and number of islands = 836 was melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and then wound up. The obtained undrawn yarn was subjected to roller drawing at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. to wind up to obtain a yarn for polyester multifilament A. The obtained sea-island type composite drawn yarn was 56 dtex / 10 fil and the cross section of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 700 nm.
Next, two drawn yarns (polyester multifilament A yarn) and a multifilament (33 dtex / 12fil, made of polyethylene terephthalate that does not contain a matting agent (titanium dioxide) and does not contain any inorganic fine particles other than the matting agent. A single yarn fineness of 2.75 dtex, one polyester multifilament B) was mixed by interlacing to obtain a mixed yarn.
And after twisting the blended yarn at 300 times / m (S direction), the whole amount is arranged in the warp and the weft, and the weave density is 172 warps / 2.54 cm and 59 wefts / 2.54 cm. A five-piece satin woven fabric was obtained by a normal weaving method.
Next, the fabric was wet-heat treated at 50 ° C., and then the weight was reduced by 23.8% (alkaline reduction) at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove the sea component of the sea-island type composite drawn yarn. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A was 700 nm, the single fiber diameter of the polyester multifilament B was 16.1 μm, the cover factor CF was 3442, and the thickness was 0.25 mm.
A magnetic disk polishing cloth was obtained using the obtained woven fabric, and a texture processing test was performed. The number of defects on the disk surface was 92, the polishing effect was “good”, and there was no problem in magnetic properties.
[Example 2]
In the same manner as in Example 1, sea-island type composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn) was obtained. Next, two drawn yarns (polyester multifilament A yarn) and a multifilament (33 dtex / 12fil, made of polyethylene terephthalate that does not contain a matting agent (titanium dioxide) and does not contain any inorganic fine particles other than the matting agent. A single yarn fineness of 2.75 dtex and one polyester multifilament B1) were mixed by interlacing to obtain a mixed yarn. And after twisting this mixed fiber at 300 times / m (S direction), the whole quantity was arranged only to the warp.
On the other hand, as the polyester multifilament B2, two multifilament false twist crimped yarns (56 dtex / 144 fil, single yarn fineness 0.39 dtex) made of polyethylene terephthalate containing matting agent (titanium dioxide) 0.07% by weight are drawn. After twisting at an alignment of 300 times / m (S direction), the entire amount was arranged on the weft.
Subsequently, a woven fabric machine having a satin weave structure of 5 sheets was obtained by a normal weaving method at a weave density of 172 warps / 2.54 cm and weft density 67 / 2.54 cm.
Then, after wet-heat-treating the woven fabric at 50 ° C., in order to remove the sea component of the sea-island type composite drawn yarn, the weight was reduced by 20.5% (alkaline reduction) at 55 ° C. with a 2.5% NaOH aqueous solution. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A is 700 nm, the single fiber diameter of the polyester multifilament B1 is 16.1 μm, the single fiber diameter of the polyester multifilament B2 is 5.9 μm, the cover factor CF is 3626, and the thickness is 0.00. It was 33 mm. The compression stiffness was 0.41.
A magnetic disk polishing cloth was obtained using the obtained woven fabric, and a texture processing test was performed. The number of defects on the disk surface was 86, the polishing effect was “good”, and there was no problem in magnetic properties.
[Example 3]
In the same manner as in Example 1, after obtaining a sea-island type composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn), two drawn yarns (polyester multifilament A yarn) and a matting agent (titanium dioxide) ) And a multifilament (33 dtex / 12fil, single yarn fineness 2.75 dtex, polyester multifilament B1) made of polyethylene terephthalate which does not contain inorganic fine particles other than a matting agent, is interlaced. A mixed yarn was obtained. Then, the mixed yarn was twisted at 300 times / m (Z direction), and then all of the mixed yarn was arranged in the weft.
On the other hand, multifilament yarn 84 dtex / 72 fil (single yarn fineness 1.17 dtex, Teijin Fibers Ltd.) made of polyethylene terephthalate which does not contain matting agent (titanium dioxide) and does not contain inorganic fine particles other than matting agent as polyester multifilament B2. )) Was twisted at 300 times / m (Z direction), and the entire amount was distributed only to the warp.
A woven fabric machine having a satin weave structure of 5 sheets was obtained by a normal weaving method at a weave density of warp density 150 / 2.54 cm and weft density 101 / 2.54 cm.
In the same manner as in Example 1, the raw fabric machine was wet-heat treated at 50 ° C., and then the sea component of the sea-island type composite drawn yarn was removed by 19.2% at 55 ° C. with a 2.5% NaOH aqueous solution. (Alkaline weight loss). Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A is 700 nm, the single fiber diameter of the polyester multifilament B1 is 16.1 μm, the single fiber diameter of the polyester multifilament B2 is 10.4 μm, the cover factor CF is 3148, and the thickness is 0.00. It was 20 mm.
A magnetic disk polishing cloth was obtained using the obtained woven fabric, and a texture processing test was performed. The number of defects on the disk surface was 69, the polishing effect was “good”, and there was no problem in magnetic properties.
[Example 4]
Polyethylene terephthalate containing 0.07% by weight of matting agent (titanium dioxide) as an island component, and polyethylene terephthalate copolymerized with 9% by mole of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component A sea-island type composite unstretched fiber having sea: island = 30: 70 and number of islands = 836 was melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and wound up once. The obtained undrawn yarn was subjected to roller drawing at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. to wind up to obtain a yarn for polyester multifilament A. The obtained sea-island type composite drawn yarn was 56 dtex / 10 fil and the cross section of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 700 nm.
Next, a multifilament (33 dtex / 12 film, single yarn fineness 2.75 dtex) made of polyethylene terephthalate containing 0.35% by weight of the two drawn yarns (polyester multifilament A yarn) and a matting agent (titanium dioxide). Polyester multifilament B) was mixed by interlacing to obtain a mixed fiber. The mixed yarn was twisted at 300 times / m (S direction), and then all of the mixed yarn was distributed only to the warp.
On the other hand, as the polyester multifilament B2, two multifilament false twist crimped yarns (56 dtex / 144 fil, single yarn fineness 0.39 dtex) made of polyethylene terephthalate containing matting agent (titanium dioxide) 0.07% by weight are drawn. After twisting at an alignment of 300 times / m (S direction), the entire amount was arranged on the weft.
Subsequently, a woven fabric machine having a satin weave structure of 5 sheets was obtained by a normal weaving method at a weave density of 172 warps / 2.54 cm and weft density 67 / 2.54 cm.
Then, after wet-heat-treating the woven fabric at 50 ° C., it was reduced by 20.7% (alkali reduction) at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove the sea component of the sea-island type composite drawn yarn. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A is 700 nm, the single fiber diameter of the polyester multifilament B1 is 16.1 μm, the single fiber diameter of the polyester multifilament B2 is 5.9 μm, the cover factor CF is 3580, and the thickness is 0.00. It was 33 mm.
A magnetic disk polishing cloth was obtained using the obtained woven fabric, and a texture processing test was performed. The number of defects on the disk surface was 89, the polishing effect was “good”, and there was no problem in magnetic properties.
[Comparative Example 1]
In the same manner as in Example 1, a sea-island type composite drawn yarn (polyester multifilament A yarn) was obtained. And the multifilament (33 dtex / 12fil, single yarn fineness 2.75dtex, polyester multifilament B1) which consists of two said sea-island type composite stretched yarns and polyethylene terephthalate containing 1.0% by weight of matting agent (titanium dioxide) A blended yarn was obtained by blending one with interlace processing. And after twisting this mixed fiber at 300 times / m (S direction), the whole quantity was arranged only to the warp.
On the other hand, as polyester multifilament B2, multifilament false twist crimped yarn (110 dtex / 144 fil, single yarn fineness 0.76 dtex) made of polyethylene terephthalate containing 1.0% by weight of matting agent (titanium dioxide) is 300 times / After twisting in m (S direction), the entire amount was arranged in the weft.
A woven fabric machine having a satin woven structure of 5 sheets was obtained by a normal weaving method at a weaving density of warp density of 172 / 2.54 cm and weft density of 67 / 2.54 cm.
Then, after wet-heat-treating the woven fabric at 50 ° C., in order to remove the sea component of the sea-island type composite drawn yarn, the weight was reduced by 20.5% (alkaline reduction) at 55 ° C. with a 2.5% NaOH aqueous solution. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A is 700 nm, the single fiber diameter of the polyester multifilament B1 is 16.1 μm, the single fiber diameter of the polyester multifilament B2 is 8.5 μm, the cover factor CF is 3585, and the thickness is 0.00. It was 31 mm.
Using the obtained woven fabric, a magnetic disk polishing cloth was obtained and subjected to a texturing test. The number of defects on the disk surface was about 367, the polishing effect was “poor”, and the magnetic properties were inferior.
[Example 5]
A wiping cloth was obtained using the fabric obtained in Example 1, and a wiping test was performed. The wiping performance was “good” and the dust generation was also “good”.
[ Reference example 1 ]
In the same manner as in Example 1, sea-island type composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn) was obtained. Then, the sea-island type composite drawn yarn was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
On the other hand, as the polyester multifilament B, a multifilament 84 dtex / 72 fil (single yarn fineness 1.17 dtex) made of polyethylene terephthalate which does not contain a matting agent (titanium dioxide) and does not contain inorganic fine particles other than the matting agent 300 times / The yarn was twisted at m (Z direction), and all the warp yarns were arranged.
Then, a woven fabric machine having a satin woven structure of 5 sheets was obtained by a normal weaving method at a weave density of warp density 150 / 2.54 cm and weft density 163 / 2.54 cm.
Next, the fabric was wet-heated at 50 ° C. and then reduced by 19.2% (alkali reduction) at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove the sea components of the sea-island type composite drawn yarn. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained fabric, the single fiber diameter of the polyester multifilament A is 700 nm, the single fiber diameter of the polyester multifilament B is 10.4 μm, the cover factor CF of the fabric is 3148, the thickness of the fabric is 0.18 mm, and the friction coefficient is 0.58. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. The wiping performance was “good” and the dust generation was also “good”.
[ Reference example 2 ]
Polyethylene terephthalate containing 0.07% by weight of matting agent (titanium dioxide) as an island component, and polyethylene terephthalate copolymerized with 9% by mole of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component A sea-island type composite unstretched fiber having sea: island = 30: 70 and number of islands = 836 was melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and wound up once. The obtained undrawn yarn was subjected to roller drawing at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. to wind up to obtain a yarn for polyester multifilament A. The obtained sea-island type composite drawn yarn was 56 dtex / 10 fil and the cross section of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 700 nm. Then, the sea-island type composite drawn yarn was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
On the other hand, as polyester multifilament B, multifilament yarn 84 dtex / 36 fil (single yarn fineness 2.33 dtex) made of polyethylene terephthalate containing 0.35% by weight of matting agent (titanium dioxide) is 300 times / m (Z direction). And twisted all the way to the warp.
Then, a woven fabric machine having a satin woven structure of 5 sheets was obtained by a normal weaving method at a weave density of warp density 150 / 2.54 cm and weft density 163 / 2.54 cm.
Next, the fabric was subjected to a wet heat treatment at 50 ° C., and then a 19.1% reduction (alkali reduction) was performed at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove sea components of the sea-island type composite drawn yarn. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A is 700 nm, the single fiber diameter of the polyester multifilament B is 14.8 μm, the cover factor CF of the fabric is 3180, the thickness of the fabric is 0.18 mm, and the friction coefficient is 0.51. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. The wiping performance was “good” and the dust generation was also “good”.
[ Reference example 3 ]
Polyethylene terephthalate containing 0.35% by weight of matting agent (titanium dioxide) as an island component, and polyethylene terephthalate copolymerized with 9% by mole of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component A sea-island type composite unstretched fiber having sea: island = 30: 70 and number of islands = 836 was melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and wound up once. The obtained undrawn yarn was subjected to roller drawing at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. to wind up to obtain a yarn for polyester multifilament A. The obtained sea-island type composite drawn yarn was 56 dtex / 10 fil and the cross section of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 700 nm. Then, the sea-island type composite drawn yarn was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
On the other hand, a multifilament 84 dtex / 36 fil (single yarn fineness 2.33 dtex) made of polyethylene terephthalate containing 0.35% by weight of a matting agent (titanium dioxide) as polyester multifilament B is 300 times / m (Z direction). The yarn was twisted and all of the warp was distributed.
Then, a woven fabric machine having a satin woven structure of 5 sheets was obtained by a normal weaving method at a weave density of warp density 150 / 2.54 cm and weft density 163 / 2.54 cm.
Next, the fabric was wet-heated at 50 ° C., and then reduced by 19.3% (alkali reduction) at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove the sea component of the sea-island type composite drawn yarn. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained fabric, the single fiber diameter of the polyester multifilament A is 700 nm, the single fiber diameter of the polyester multifilament B is 14.8 μm, the cover factor CF of the fabric is 3046, the thickness of the fabric is 0.17 mm, and the friction coefficient is 0.59. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. The wiping performance was “good” and the dust generation was also “good”.
[ Reference example 4 ]
In the same manner as in Example 1, sea-island type composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn) was obtained. Then, two drawn yarns (polyester multifilament A yarn) and a multifilament (33 dtex / 12fil, made of polyethylene terephthalate that does not contain a matting agent (titanium dioxide) and does not contain inorganic fine particles other than the matting agent. Polyester multifilament B1) and interlaced yarn were used to obtain mixed yarn. Then, the mixed yarn containing the sea-island type composite drawn yarn was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
on the other hand, Reference example 1 Similarly, multifilament 84 dtex / 72 fil (single yarn fineness 1.17 dtex, polyester multifilament B2) made of polyethylene terephthalate which does not contain matting agent (titanium dioxide) and does not contain inorganic fine particles other than matting agent 300 times / M (Z direction) was twisted and all the warp yarns were distributed.
A woven fabric machine having a satin weave structure of 5 sheets was obtained by a normal weaving method at a weave density of warp density 150 / 2.54 cm and weft density 102 / 2.54 cm.
Next, after wet-heat treating the woven fabric at 50 ° C. in the same manner as in Example 1, in order to remove the sea component of the sea-island type composite drawn yarn, it was 15.5% at 55 ° C. with a 2.5% NaOH aqueous solution. Reduced weight (alkaline weight loss). Thereafter, conventional wet heat processing and dry heat processing were performed in the same manner as in Example 1.
In the obtained woven fabric, the single fiber diameter of polyester multifilament A is 700 nm, the single fiber diameter of polyester multifilament B1 is 16.1 μm, the single fiber diameter of polyester multifilament B2 is 10.4 μm, the cover factor CF of the fabric is 3077, and the friction coefficient Was 0.54. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. The wiping performance was “good” and the dust generation was also “good”.
[ Example 6 ]
In the same manner as in Example 1, after obtaining a sea-island type composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn), two drawn yarns (polyester multifilament A yarn) and a matting agent (titanium dioxide) ) Was mixed with a multifilament (33 dtex / 12fil, polyester multifilament yarn B1) made of polyethylene terephthalate containing 0.35% by weight to obtain a blended yarn. Then, the mixed yarn was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
on the other hand, Reference example 1 In the same way as above, a multifilament yarn 84 dtex / 72 fil (single yarn fineness 1.17 dtex, polyester multifilament B2) made of polyethylene terephthalate containing no matting agent (titanium dioxide) and no inorganic fine particles other than the matting agent 300 times / M (Z direction) was twisted and all the warp yarns were distributed.
A woven fabric machine having a satin weave structure of 5 sheets was obtained by a normal weaving method at a weave density of warp density 150 / 2.54 cm and weft density 102 / 2.54 cm.
Next, after wet-heat treating the woven fabric at 50 ° C. in the same manner as in Example 1, in order to remove the sea component of the sea-island type composite drawn yarn, it was 15.5% at 55 ° C. with a 2.5% NaOH aqueous solution. Reduced weight (alkaline weight loss). Thereafter, conventional wet heat processing and dry heat processing were performed in the same manner as in Example 1.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A is 700 nm, the single fiber diameter of the polyester multifilament B1 is 16.1 μm, the single fiber diameter of the polyester multifilament yarn B2 is 10.4 μm, and the cover factor CF of the woven fabric is 3124, the coefficient of friction was 0.56. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. The wiping performance was “good” and the dust generation was also “good”.
[ Reference Example 5 ]
In the same manner as in Example 1, sea-island type composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn) was obtained. Then, the sea-island type composite stretched yarn (polyester multifilament A yarn) was twisted at a rate of 300 times / m (Z direction), and the entire amount was arranged in the weft.
on the other hand, Reference example 1 In the same manner as above, a multifilament yarn 84 dtex / 72 fil (single yarn fineness 1.17 dtex) made of polyethylene terephthalate not containing inorganic fine particles such as a matting agent was twisted at 300 times / m (Z direction) and all the warp yarns were arranged.
Then, a plain fabric woven machine was obtained by a normal weaving method at a weaving density of warp density 107 / 2.54 cm and weft density 70 / 2.54 cm.
Next, the fabric was wet-heated at 50 ° C., and then reduced by 19.0% (alkali reduction) at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove sea components of the sea-island type composite drawn yarn. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A was 700 nm, and the single fiber diameter of the multifilament yarn 84 dtex / 72 fil was 10.4 μm. The cover factor CF was 2037, and the friction coefficient was 0.34. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. Dust generation was “good” but wiping performance was “normal”.
[Comparative Example 2]
In the same manner as in Example 1, sea-island type composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn) was obtained. Then, the sea-island type composite stretched yarn (polyester multifilament A yarn) was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
On the other hand, a multifilament yarn 84 dtex / 36 fil (single yarn fineness 2.33 dtex) made of polyethylene terephthalate containing 1.0% by weight of a matting agent (titanium dioxide) is twisted at 300 times / m (Z direction), and warp The whole amount was distributed.
A woven fabric machine having a satin weave structure of 5 sheets was obtained by a normal weaving method at a weave density of warp density 150 / 2.54 cm and weft density 101 / 2.54 cm.
Next, the fabric was wet-heat treated at 50 ° C. in the same manner as in Example 1, and then removed with a 2.5% NaOH aqueous solution and 18.8% at 55 ° C. in order to remove sea components of the sea-island type composite drawn yarn. Reduced weight (alkali weight loss). Thereafter, conventional wet heat processing and dry heat processing were performed in the same manner as in Example 1.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A was 700 nm, and the single fiber diameter of the multifilament yarn 84 dtex / 36 fil was 14.8 μm. The cover factor CF was 3073, and the friction coefficient was 0.65. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. The wiping performance was “good”, but the dust generation was “poor”, and minute scratches were observed on the glass plate.
[ Example 7 ]
Polyethylene terephthalate containing no matting agent (titanium dioxide) as an island component and no inorganic fine particles other than the matting agent, 9% by weight of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component Using a polyethylene terephthalate copolymerized, a sea-island type composite unstretched fiber with sea: islands = 30: 70 and number of islands = 836 was melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and then wound up. The obtained undrawn yarn was subjected to roller drawing at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. to wind up to obtain a polyester multifilament yarn A yarn. The obtained sea-island type composite drawn yarn was 56 dtex / 10 fil and the cross section of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 700 nm. Also prepared as polyester multifilament B1 is a multifilament 33dtex / 12fil made of highly heat-shrinkable isophthalic acid copolymerized polyethylene terephthalate that does not contain matting agent (titanium dioxide) and does not contain any inorganic fine particles other than matting agent. The polyester multifilament A (two) and the polyester multifilament yarn B1 (one) are aligned and mixed by interlacing to obtain a composite yarn C. Then, the composite yarn C was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
On the other hand, as polyester multifilament B2, multifilament 84dtex / 72fil made of polyethylene terephthalate that does not contain matting agent (titanium dioxide) and does not contain inorganic fine particles other than matting agent is twisted at 300 times / m (Z direction). The whole amount was distributed to the warp.
Then, with a weaving density of warp density of 220 / 2.54 cm and weft density of 150 / 2.54 cm, a 4/1 five-sheet satin woven structure (composite yarn C has four floating yarns) was formed by a normal weaving method. Included as a weft float component).
Next, the fabric was wet-heated at 50 ° C., and then the weight of the islands was reduced by 13.2% (alkaline reduction) at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove the sea component of the sea-island type composite drawn yarn. . Thereafter, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the average fiber diameter of the polyester multifilament A was 700 nm, and the width between the maximum value and the minimum value was 15% with respect to the average fiber diameter. The single fiber diameter of the polyester multifilament B1 was 16 μm. DA / DB was 1.15. The single fiber diameter of the polyester multifilament B2 was 10.5 μm. Further, on the surface of the fabric, the friction coefficient was 0.72, and the surface roughness was 0.94 μm. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. The wiping performance was “good”.
[ Example 8 ]
Example 7 In the same manner as above, a sea-island type composite drawn yarn 56 dtex / 10 fil (polyester multifilament A) was obtained. And Example 7 In the same manner as above, the multifilament yarn 33 dtex / consisting of the two drawn yarns and a high heat-shrinkable isophthalic acid copolymerized polyethylene terephthalate containing no matting agent (titanium dioxide) and no inorganic fine particles other than the matting agent. A composite yarn C composed of 12 fil (single fiber diameter: 16 μm, polyester multifilament B1) was obtained. Then, the composite yarn C was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
on the other hand, Example 7 Similarly to polyester multifilament B2, multifilament 84dtex / 72fil (single fiber diameter 10.5 μm) made of polyethylene terephthalate which does not contain matting agent (titanium dioxide) and does not contain any inorganic fine particles other than matting agent is 300 times / The yarn was twisted at m (Z direction) and all the warp yarns were arranged.
Then, at a weaving density of warp density of 150 / 2.54 cm and weft density of 131 / 2.54 cm, a 2/2 twill structure (composite yarn C is a weft float component with 2 float yarns) by a normal weaving method. Included)).
Then Example 7 After the wet heat treatment at 50 ° C. in the same manner as described above, 15.8% weight loss (alkaline weight loss) at 55 ° C. with 2.5% NaOH aqueous solution to remove sea components of the sea-island type composite drawn yarn. did. Thereafter, in the same manner as in Example 12, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the average fiber diameter of the polyester multifilament A was 700 nm, and the width between the maximum value and the minimum value was 29% with respect to the average fiber diameter. The single fiber diameter of the polyester multifilament B1 was 16 μm. DA / DB was 1.10. The single fiber diameter of the polyester multifilament B2 was 10.5 μm. Further, on the surface of the fabric, the coefficient of friction was 0.55, and the surface roughness was 1.68 μm. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. The wiping performance was “pass”.
[ Example 9 ]
Example 7 In the same manner as above, a sea-island composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn) was obtained. And Example 7 In the same manner as above, a multifilament yarn 33 dtex comprising two drawn yarns and a high heat-shrinkable isophthalic acid copolymerized polyethylene terephthalate that does not contain a matting agent (titanium dioxide) and does not contain any inorganic fine particles other than the matting agent. A composite yarn C composed of / 12 fil (polyester multifilament B1) was obtained. Then, the composite strip C was twisted at 300 times / m (Z direction), and the entire amount was arranged in the weft.
on the other hand, Example 7 In the same manner as the polyester multifilament B2, a multifilament 84dtex / 72fil made of polyethylene terephthalate that does not contain a matting agent (titanium dioxide) and does not contain any inorganic fine particles other than the matting agent is 300 times / m (Z direction). The yarn was twisted and all of the warp was distributed.
A plain fabric woven machine was obtained by a normal weaving method at a weaving density of warp density of 156 / 2.54 cm and weft density of 105 / 2.54 cm.
Next, in the same manner as in Example 7, the woven fabric was heat-treated at 50 ° C., and then the sea component of the sea-island type composite drawn yarn was removed with a 2.5% NaOH aqueous solution at 14.9 at 55 ° C. % Weight loss (alkali weight loss). after that, Example 7 In the same manner as described above, conventional wet heat processing and dry heat processing were performed.
In the obtained woven fabric, the average fiber diameter of the polyester multifilament A was 700 nm, and the width between the maximum value and the minimum value was 23% with respect to the average fiber diameter. DA / DB was 1.06. The single fiber diameter of the polyester multifilament B1 was 16 μm. The single fiber diameter of the polyester multifilament B2 was 10.5 μm. The friction coefficient on the fabric surface was 0.45, and the surface roughness was 3.62 μm. A wiping cloth was obtained using the obtained woven fabric, and a wiping test was performed. Wiping performance is Example 7 It was inferior.
[ Reference Example 6 ]
Polyethylene terephthalate containing no matting agent (titanium dioxide) as an island component and no inorganic fine particles other than the matting agent, 9% by weight of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component Using a polyethylene terephthalate copolymerized, a sea-island type composite unstretched fiber with sea: islands = 30: 70 and number of islands = 836 was melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and then wound up. The obtained undrawn yarn was subjected to roller drawing at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. to wind up to obtain a yarn for polyester multifilament A. The obtained sea-island type composite drawn yarn was 56 dtex / 10 fil and the cross section of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 700 nm. Then, the aforementioned sea-island type composite drawn yarn was arranged on the front and middle ridges of a normal 28 gauge warp knitting machine.
On the other hand, a polyester multifilament B (33 dtex / 12 fil) made of polyethylene terephthalate that does not contain a matting agent (titanium dioxide) and does not contain inorganic fine particles other than the matting agent was placed on the bag of the warp knitting machine.
Then, a warp knitting machine having a satin structure was obtained with a satin structure (back: 10/21, middle: 10/34, front: 10/34).
Next, the knitted fabric was subjected to a wet heat treatment at 50 ° C., and then a 25% weight reduction (an alkali weight reduction) was performed at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove sea components of the sea-island type composite drawn yarn. Thereafter, conventional wet heat processing was performed, and then heat setting was performed at 180 ° C. for 1 minute using a normal pin tenter (manufactured by Hirano Tech Seed).
In the obtained knitted fabric, the average single fiber diameter of the polyester multifilament A was 700 nm, and the width between the maximum value and the minimum value was 15% with respect to the average fiber diameter. The single fiber diameter of the polyester multifilament B was 16 μm. Further, in the obtained knitted fabric, the elongation was 61% in the vertical direction and 97% in the horizontal direction.
The knitted fabric was slit to a width of 38.1 mm to obtain an abrasive tape suitable for polishing a glass hard disk substrate. Polishing was carried out using the polishing tape in combination with a slurry containing 0.07 μm polycrystalline diamond abrasive grains in the abrasive and containing an anionic dispersant. The surface average roughness Ra of the substrate after polishing was as good as Ra = 1.45 mm, there were very few defects such as scratches, and the yield as a hard disk medium was stable at 98%.
[ Example 10 ]
Reference Example 6 In the same manner as above, a sea-island composite drawn yarn 56 dtex / 10 fil (polyester multifilament A yarn) was obtained. Next, the two drawn yarns and one polyester multifilament B1 (33 dtex / 12 fil) made of polyethylene terephthalate that does not contain a matting agent (titanium dioxide) and does not contain any inorganic fine particles other than the matting agent are interlaced. To obtain a blended yarn. Then, the mixed yarn was twisted at 300 times / m (S direction), and the entire amount was distributed to the warp.
On the other hand, two multifilament false twisted crimped yarns (polyester multifilament B2, 56 dtex / 144fil) made of polyethylene terephthalate that do not contain matting agent (titanium dioxide) and do not contain inorganic fine particles other than matting agent are aligned. After twisting at 300 times / m (S direction), the entire amount was arranged in the weft.
Then, a woven fabric machine having a satin weave structure of 5 sheets was obtained by a normal weaving method at a weaving density of 171 warps / 2.54 cm and weft density 67 / 2.54 cm.
Next, the fabric was subjected to wet heat treatment at 50 ° C., and then a 20% reduction (alkali reduction) was performed at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove the sea component of the sea-island type composite drawn yarn. Thereafter, conventional wet heat processing was performed, and then heat setting was performed at 180 ° C. for 1 minute using a normal pin tenter (manufactured by Hirano Tech Seed).
In the obtained woven fabric, the average single fiber diameter of the polyester multifilament A was 700 nm, and the width between the maximum value and the minimum value was 20% with respect to the average fiber diameter. The single fiber diameter of the polyester multifilament B1 was 16 μm, and the single fiber diameter of the polyester multifilament B2 was 6.0 μm. Further, the elongation was 65% in the vertical direction and 40% in the horizontal direction.
The woven fabric was slit to a width of 38.1 mm to obtain a polishing tape suitable for polishing a glass hard disk substrate. Using the abrasive tape, Reference Example 6 Polishing was carried out in the same manner as described above. The surface average roughness Ra of the substrate after polishing was as good as Ra = 1.95 mm, there were very few defects such as scratches, and the yield as a hard disk medium was stable at 95%.
[ Reference Example 7 ]
Reference Example 6 After the warp knitting machine was obtained in the same manner as described above, the knitted fabric was subjected to wet heat treatment at 50 ° C., and then a 2.5% NaOH aqueous solution was used at 25 ° C. % Weight loss (alkali weight loss). Then, the usual wet heat processing was performed, and it finished only by drying after that.
In the obtained knitted fabric, the average single fiber diameter of the polyester multifilament A was 700 nm, and the width between the maximum value and the minimum value was 15% with respect to the average fiber diameter. The elongation was 91% in the vertical direction and 230% in the horizontal direction.
The knitted fabric was slit to a width of 38.1 mm to obtain an abrasive tape suitable for polishing a glass hard disk substrate. Polishing was carried out using the polishing tape in combination with a slurry containing 0.07 μm polycrystalline diamond abrasive grains in the abrasive and containing an anionic dispersant. The surface roughness Ra of the substrate after polishing was good at 1.51 mm, but there were frequent defects such as minute waviness and scratches, and the yield as a hard disk medium was 50%. Reference Example 6 It was lower than that obtained in
[ Reference Example 8 ]
Polyethylene terephthalate containing no matting agent (titanium dioxide) as an island component and no inorganic fine particles other than the matting agent, 9% by weight of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component Using a polyethylene terephthalate copolymerized, a sea-island type composite unstretched fiber with sea: islands = 30: 70 and number of islands = 836 was melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and then wound up. The obtained undrawn yarn was subjected to roller drawing at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. to wind up to obtain a yarn for polyester multifilament A. The obtained sea-island type composite drawn yarn was 56 dtex / 10 fil, and the crossing direction of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 700 nm. Then, using the usual 28-gauge warp knitting machine, the above-mentioned sea-island type composite drawn yarn was arranged on the front and middle ridges.
On the other hand, a multifilament (polyester multifilament B, 33 dtex / 12 file) made of polyethylene terephthalate which does not contain a matting agent (titanium dioxide) and does not contain inorganic fine particles other than the matting agent was disposed on the back ridge of the warp knitting machine. .
Then, a warp knitting machine having a satin structure was obtained with a satin structure (back: 10/21, middle: 10/34, front: 10/34).
Next, the knitted fabric was subjected to a wet heat treatment at 50 ° C., and then a 25% weight reduction (an alkali weight reduction) was performed at 55 ° C. with a 2.5% NaOH aqueous solution in order to remove sea components of the sea-island type composite drawn yarn. Thereafter, conventional dyeing finishing, wet heat processing, and dry heat processing were performed.
Then, a 100 μm-thick polyethylene terephthalate film (“Melinex” manufactured by Teijin DuPont Films Ltd.) was bonded to the back of the knitted fabric by a conventional laminating method, and a polishing layer made of knitted fabric and a polyethylene terephthalate film The composite sheet comprised with the base layer which consists of was obtained.
In the obtained composite sheet, the average single fiber diameter of the polyester multifilament A was 700 nm, and the width between the maximum value and the minimum value was 15% with respect to the average fiber diameter. The single fiber diameter of the polyester multifilament B was 16 μm. Moreover, the thickness of the composite sheet was 0.45 mm.
The composite sheet was cut into a circle having a diameter of 380 mm to obtain a polishing pad suitable for polishing a silicon wafer. Using this polishing pad, a slurry containing 5% by weight of 0.035 μm colloidal silica abrasive in the polishing agent, 80 rpm, 200 gf / cm ² And polished for 10 minutes. The polishing efficiency was as good as 0.6 μm / min, and there were very few defects such as scratches.
[ Reference Example 9 ]
Reference Example 8 After a knitted fabric was obtained in the same manner as described above, a porous foam made of polyurethane resin having a thickness of 200 μm was bonded to the back surface of the knitted fabric by a conventional laminating method, whereby a polishing layer made of knitted fabric and porous foam A composite sheet composed of a base layer composed of a body was obtained.
In the obtained composite sheet, the average single fiber diameter of the polyester multifilament A was 700 nm, and the width between the maximum value and the minimum value was 15% with respect to the average fiber diameter. Moreover, the single fiber diameter of the polyester multifilament B was 16 micrometers. Moreover, the thickness of the composite sheet was 0.58 mm.
The composite sheet was cut into a circle having a diameter of 380 mm to obtain a polishing pad suitable for polishing a silicon wafer. Using this polishing pad, using a slurry containing 5 wt% of colloidal silica abrasive particles of 0.035 μm in the abrasive, 80 rpm, 196 cN / cm ² (200 gf / cm ² ) For 10 minutes. The polishing efficiency was as good as 0.55 μm / min, and there were very few defects such as scratches.
[ Example 11 ]
Polyethylene terephthalate containing no matting agent (titanium dioxide) as an island component and no inorganic fine particles other than the matting agent, 9% by weight of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component Using a polyethylene terephthalate copolymerized, a sea-island type composite unstretched fiber with sea: islands = 30: 70 and number of islands = 836 was melt-spun at a spinning temperature of 280 ° C. and a spinning speed of 1500 m / min, and then wound up. The obtained undrawn yarn was subjected to roller drawing at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. to wind up to obtain a yarn for polyester multifilament A. The obtained sea-island type composite drawn yarn was 56 dtex / 10 fil and the cross section of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 700 nm.
Next, a multifilament (polyester multifilament B, 33 dtex / 12 fil, single yarn fineness 2.75 dtex) composed of the drawn yarn and polyethylene terephthalate containing no matting agent (titanium dioxide) and no inorganic fine particles other than the matting agent. , Manufactured by Teijin Fibers Ltd.) by interlacing to obtain a blended yarn.
The mixed yarn was twisted at 300 times / m (S direction), and all the warp yarns and weft yarns were arranged. A woven fabric having a satin weave structure of 5 sheets was obtained by a normal weaving method at a weaving density of warp density of 215 / 2.54 cm and weft density of 105 / 2.54 cm.
Then, after wet-heat treating the woven fabric at 60 ° C., the weight was reduced by 20% (alkali reduction) with a 3.5% NaOH aqueous solution at 60 ° C. in order to remove the sea component of the sea-island type composite drawn yarn. Thereafter, a conventional dyeing process and a hydrophilic process were carried out in the same bath treatment, so that a hydrophilic agent (polyethylene terephthalate-polyethylene glycol copolymer) was attached in an amount of 3.0% by weight based on the weight of the fabric.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A was 700 nm, and the single fiber diameter of the polyester multifilament B was 16 μm. The cover factor CF of the fabric was 3280, the thickness was 0.28 mm, and the water absorption speed was 2.1 seconds. A magnetic disk polishing cloth was obtained using the obtained woven fabric, and a texture processing test was performed. The number of defects on the disk surface was 140, the polishing effect was “good”, and there was no problem in magnetic properties.
[ Example 12 ]
Example 11 In the same manner as above, a sea-island type composite drawn yarn 56 dtex / 10 fil polyester multifilament A was obtained. A multifilament (polyester multifilament B1, 33 dtex /) comprising two drawn yarns (polyester multifilament A) and polyethylene terephthalate containing no matting agent (titanium dioxide) and no inorganic fine particles other than the matting agent. 12fil, single yarn fineness 2.75dtex, manufactured by Teijin Fibers Ltd.) were interlaced to obtain a mixed yarn. The mixed yarn was twisted at 300 times / m (S direction), and all the warp yarn was distributed.
On the other hand, a multifilament false twist crimped yarn 56 dtex / 144 fil composed of polyethylene terephthalate containing no matting agent (titanium dioxide) and no inorganic fine particles other than the matting agent (crimp rate 6.6%, polyester multifilament) Two yarns B2) were aligned and twisted at 300 times / m (S direction), and all of the yarns were arranged in the weft yarns.
A woven fabric machine having a satin woven structure of 5 sheets was obtained by a normal weaving method at a weaving density of warp density of 172 / 2.54 cm and weft density of 67 / 2.54 cm.
Then Example 11 In the same manner as described above, the woven fabric was wet-heat treated at 60 ° C., and then a 25% weight reduction (alkaline weight reduction) was performed at 60 ° C. with a 3.5% NaOH aqueous solution in order to remove sea components of the sea-island type composite drawn yarn. after that, Example 11 In the same manner as described above, the hydrophilizing agent (polyethylene terephthalate-polyethylene glycol copolymer) was deposited in an amount of 7.0% by weight based on the fabric weight by performing the same bath treatment for the dyeing process and the hydrophilic process.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A was 700 nm, the single fiber diameter of the polyester multifilament B1 was 16 μm, and the single fiber diameter of the polyester multifilament B2 was 5.9 μm. The cover factor CF of the fabric was 3505, the thickness was 0.34 mm, and the water absorption rate was 1.7 seconds. A magnetic disk polishing cloth was obtained using the obtained woven fabric, and a texture processing test was performed. The number of defects on the disk surface was 75, the polishing effect was “good”, and there was no problem in magnetic properties.
[ Example 13 ]
Example 11 After obtaining the woven fabric in the same manner as in Example 20, the fabric was wet-heat treated at 60 ° C., and then, in order to remove the sea component of the sea-island type composite drawn yarn, The weight was reduced by 20% (alkali weight loss) at ° C. Thereafter, conventional wet heat processing and dry heat processing were performed without performing hydrophilic processing.
In the obtained woven fabric, the single fiber diameter of the polyester multifilament A was 700 nm, and the single fiber diameter of the polyester multifilament B was 16 μm. The cover factor CF was 3270, the thickness was 0.27 mm, and the water absorption rate was 12.5 seconds. A magnetic disk polishing cloth was obtained using the obtained woven fabric, and a texture processing test was performed. The fabric has 260 defects on the surface of the disk. Example 11 It was inferior to that obtained in The fabric also has magnetic properties, Example 11 It was inferior to what was obtained in.

  ADVANTAGE OF THE INVENTION According to this invention, it can be used as a cloth for abrasive cloth which can form a fine groove | channel in a to-be-polished object, reducing the defect (scratch) incidence rate of to-be-polished object, and wipeability A fabric that can be used as a fabric for wiping products with good dust generation and low dust generation, a composite sheet using the fabric, an abrasive cloth, and a wiping product are provided, which have high utility. It is.

Claims (13)

A polyester multifilament A having a single fiber diameter of 50 to 1500 nm and a filament number of 1000 or more, and a matting agent content of 0.5, which is made of polyester with a matting agent content of 0.5% by weight or less. A polyester multifilament B having a single fiber diameter of 3 μm or more, which is made of polyester of not more than% by weight, is contained in the fabric as a composite yarn, and in the composite yarn, the yarn length DA of the polyester multifilament A and the yarn length of the polyester multifilament B A wiping product using a fabric characterized in that the ratio DA / DB to DB is 1.05 or more . The wiping product according to claim 1, wherein the polyester multifilament A is a multifilament obtained by dissolving and removing a sea component of a sea-island composite fiber composed of a sea component and an island component . The wiping product according to claim 1, wherein the number of filaments of the polyester multifilament B is in the range of 10 to 300 . The fabric according to claim 1, wherein the fabric is a woven fabric containing the composite yarn, and the composite yarn is included as a warp-lifting component and / or a weft-lifting component having two or more floats in the woven fabric structure of the fabric. Wiping products. The wiping product according to claim 1, wherein the fabric is a woven fabric, and the cover factor CF of the woven fabric is in the range of 1500 to 4500 . The wiping product according to claim 1, wherein the thickness of the fabric is within a range of 0.10 to 0.80 mm . The wiping product according to claim 1, wherein the compression stiffness of the fabric measured by a KES texture measuring instrument is in the range of 0.08 to 0.9 . The wiping product according to claim 1, wherein the hydrophilizing agent is adhered to the fabric in a range of 0.2 to 10.0% by weight based on the weight of the fabric . The wiping product according to claim 8, wherein the water absorption rate measured by JIS L1096-1998 6.26.1 drop method is 10 seconds or less . The wiping product according to claim 1, wherein both the warp direction elongation and the weft direction elongation of the fabric are 200% or less . A wiping product using a composite sheet obtained by bonding a sheet made of an organic material to the fabric described in item 1 . The wiping product according to claim 11, wherein the thickness of the sheet made of an organic material is in a range of 20 to 500 µm . The wiping product according to claim 11, wherein the sheet made of an organic material is made of a porous foam .

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