Abstract: Provided is a sheet for an absorbent article including a nonwoven fabric containing cellulose-based fibers in an amount of more than 90% by mass, the nonwoven fabric being formed by entangling fibers, wherein the nonwoven fabric includes a plurality of first entanglement portions spaced apart from each other and a plurality of second entanglement portions spaced apart from each other, each of the first entanglement portions has a regular pattern formed by a plurality of regions having a high fiber density (hereinafter referred to as “high-density regions”) and a plurality of regions having a low fiber density (hereinafter referred to as “low-density regions”).

Abstract: The present invention provides cured article reinforcing fibers having a shape advantageous in physically bonding the fibers to a hardening material or bringing the fibers into engagement with the hardening material, and also provides a cured article using the fibers. The cured article reinforcing fiber of the present invention has a multilobal cross section with three or more projections. At least one of the projections has a substantially curved end part, and a base part situated toward the center of the fiber has a width smaller than the largest width of the end part. Thus, the fiber particularly has high bending strength. Further, the cured article of the present invention includes a mixture of the cured article reinforcing fiber and a hardening material, and the hardening material has been cured.

Abstract: A polyolefin-based split-type conjugate fiber according to the present invention is a polyolefin-based split-type conjugate fiber obtained by composite spinning including a first component containing a polypropylene-based resin and a second component containing a polyolefin-based resin, wherein the first component contains, as a primary component, a polypropylene resin having a Q value (the ratio between the weight average molecular weight Mw and the number average molecular weight Mn) of 6 or greater and a melt flow rate according to JIS K 7210 (MFR at a measurement temperature of 230° C. under a load of 2.16 kgf (21.18 N)) of 5 g/10 min or greater and less than 23 g/10 min, and the first component and the second component are adjacent to each other in a cross section of the polyolefin-based split-type conjugate fiber.

Abstract: A cement reinforcing fiber of the present invention is a cement reinforcing fiber made of a polyolefin fiber, wherein a fiber treating agent is adhered to a surface of the polyolefin fiber, and the fiber treating agent is a polyoxyethylene alkyl phosphoric ester salt. One preferred polyoxyethylene alkyl phosphoric ester salt is a compound represented by chemical formula (2) below. A cured cement of the present invention contains the above-described cement reinforcing fiber. In the chemical formula (2) above, R is an alkyl group with a carbon number of 2 to 20, A is an alkali metal element, and n is 1 to 20.

Abstract: A heat extensible fiber comprises a conjugate fiber including a first resin component having an orientation index of 30% to 70% and a second resin component having a lower melting point or softening point than the melting point of the first resin component and an orientation index of 40% or more, the second resin component being present on at least part of the surface of the conjugate fiber in a lengthwise continuous configuration. The conjugate fiber is a heat-treated or crimped fiber and being configured to thermally extend when heated at a temperature lower than the melting point of the first resin component. The heat extensible fiber has higher heat self-extensibility than conventional extensible fibers.

Abstract: A skin-covering sheet for impregnation with a cosmetic preparation according to the present invention includes a non-woven fabric in which a splittable conjugate fiber containing at least two components as viewed in fiber cross-section, namely a polyethylene component and another polymer component, and a hydrophilic fiber are blended, and hydroentangled. The conjugate fiber is partially split and includes a polyethylene ultrafine fiber having a fineness of 0.6 dtex or less. A face mask according to the present invention includes the skin-covering sheet for impregnation with a cosmetic preparation impregnated with 500 to 2000 mass % of a liquid containing a cosmetic preparation. It is therefore possible to obtain a skin-covering sheet for impregnation with a cosmetic preparation and a face mask that have good impregnating ability of a cosmetic liquid into the sheet layer, cause very little irritation to the skin, and are soft in texture.

Abstract: The present invention relates to a fiber assembly obtained by electrifying a resin in a melted state by application of voltage between a supply-side electrode and a collection-side electrode so as to extend the resin into an ultrafine composite fiber by electrospinning, and accumulating the ultrafine composite fiber, wherein the ultrafine composite fiber includes at least two polymeric components and the ultrafine composite fiber includes at least one type of composite fiber selected from a sea-island structure composite fiber and a core-sheath structure composite fiber as viewed in fiber cross section, at least one selected from an island component and a core component has a volume specific resistance of 1015?·cm or less, and at least one selected from a sea component and a sheath component has a volume specific resistance exceeding 1015?·cm.

Abstract: The present invention provides cured article reinforcing fibers having a shape advantageous in physically bonding the fibers to a hardening material or bringing the fibers into engagement with the hardening material, and also provides a cured article using the fibers. The cured article reinforcing fiber of the present invention has a multilobal cross section with three or more projections. At least one of the projections has a substantially curved end part, and a base part situated toward the center of the fiber has a width smaller than the largest width of the end part. Thus, the fiber particularly has high bending strength. Further, the cured article of the present invention includes a mixture of the cured article reinforcing fiber and a hardening material, and the hardening material has been cured.

Abstract: A polyolefin-based split-type conjugate fiber according to the present invention is a polyolefin-based split-type conjugate fiber obtained by composite spinning including a first component containing a polypropylene-based resin and a second component containing a polyolefin-based resin, wherein the first component contains, as a primary component, a polypropylene resin having a Q value (the ratio between the weight average molecular weight Mw and the number average molecular weight Mn) of 6 or greater and a melt flow rate according to JIS K 7210 (MFR at a measurement temperature of 230° C. under a load of 2.16 kgf (21.18 N)) of 5 g/10 min or greater and less than 23 g/10 min, and the first component and the second component are adjacent to each other in a cross section of the polyolefin-based split-type conjugate fiber.

Abstract: The present invention is directed to a crimping conjugate fiber, comprising a first component and a second component, wherein the first component comprises a polybutene-1; the second component comprises a polymer having a melting point higher than that of the polybutene-1 by at least 20° C., or a polymer having a melting initiation temperature (extrapolated melting initiation temperature measured using differential scanning calorimetry (DSC) as defined in JIS-K-7121) of at least 120° C.; in a cross section of the fiber, the first component occupies at least 20% of the surface of the conjugate fiber, and the centroid position of the second component is shifted from the centroid position of the conjugate fiber; and the conjugate fiber is an actualized crimping conjugate fiber in which three-dimensional crimps have been developed or a latently crimpable conjugate fiber in which three-dimensional crimps are developed by heating.

Abstract: A crimped conjugate fiber of the present invention is a conjugate fiber containing a first component and a second component, the first component containing polybutene-1 and linear low density polyethylene, the linear low density polyethylene content being 2 to 25 mass %, the second component 2 containing a polymer having a melting peak temperature at least 20° C. higher than the melting peak temperature of polybutene-1 or a polymer having a melting initiation temperature of 120° C. or higher, when viewed from a fiber cross-section, the first component occupies at least 20% of the surface of the conjugate fiber 10 and the centroid position of the second component not overlapping the centroid position of the conjugate fiber, the conjugate fiber is an actualized crimping conjugate fiber in which three-dimensional crimps have been developed or a latently crimpable conjugate fiber in which three-dimensional crimps are developed by heating.

Abstract: The present invention relates to a fiber assembly obtained by electrifying a resin in a melted state by application of voltage between a supply-side electrode and a collection-side electrode so as to extend the resin into an ultrafine composite fiber by electrospinning, and accumulating the ultrafine composite fiber, wherein the ultrafine composite fiber includes at least two polymeric components and the ultrafine composite fiber includes at least one type of composite fiber selected from a sea-island structure composite fiber and a core-sheath structure composite fiber as viewed in fiber cross section, at least one selected from an island component and a core component has a volume specific resistance of 1015?·cm or less, and at least one selected from a sea component and a sheath component has a volume specific resistance exceeding 1015?·cm.

Abstract: A skin-covering sheet for impregnation with a cosmetic preparation according to the present invention includes a non-woven fabric in which a splittable conjugate fiber containing at least two components as viewed in fiber cross-section, namely a polyethylene component and another polymer component, and a hydrophilic fiber are blended, and hydroentangled. The conjugate fiber is partially split and includes a polyethylene ultrafine fiber having a fineness of 0.6 dtex or less. A face mask according to the present invention includes the skin-covering sheet for impregnation with a cosmetic preparation impregnated with 500 to 2000 mass % of a liquid containing a cosmetic preparation. It is therefore possible to obtain a skin-covering sheet for impregnation with a cosmetic preparation and a face mask that have good impregnating ability of a cosmetic liquid into the sheet layer, cause very little irritation to the skin, and are soft in texture.

Abstract: An ultrafine composite fiber of the present invention is obtained by heating and melting a composite-resin-formed product in front of a supply-side electrode and/or in a space between electrodes and extending the composite-resin-formed product by electrospinning, wherein the composite-resin-formed product is a solid-state composite-resin-formed product having two or more phases and including a resin that has a volume specific resistance of 1015 ?·cm or less, and that is exposed on 30% or more of a surface of the composite-resin-formed product. With this, an ultrafine composite synthetic fiber and an ultrafine synthetic fiber can be obtained by electrospinning, without a solvent being mixed in a supply resin, and further, a method for manufacturing an ultrafine composite fiber, as well as a fiber structure containing an ultrafine composite fiber, are provided.

Abstract: The present invention is directed to a crimping conjugate fiber, comprising a first component and a second component, wherein the first component comprises a polybutene-1; the second component comprises a polymer having a melting point higher than that of the polybutene-1 by at least 20° C., or a polymer having a melting initiation temperature (extrapolated melting initiation temperature measured using differential scanning calorimetry (DSC) as defined in JIS-K-7121) of at least 120° C.; in a cross section of the fiber, the first component occupies at least 20% of the surface of the conjugate fiber, and the centroid position of the second component is shifted from the centroid position of the conjugate fiber; and the conjugate fiber is an actualized crimping conjugate fiber in which three-dimensional crimps have been developed or a latently crimpable conjugate fiber in which three-dimensional crimps are developed by heating.

Abstract: A heat extensible fiber comprises a conjugate fiber including a first resin component having an orientation index of 30% to 70% and a second resin component having a lower melting point or softening point than the melting point of the first resin component and an orientation index of 40% or more, the second resin component being present on at least part of the surface of the conjugate fiber in a lengthwise continuous configuration. The conjugate fiber is a heat-treated or crimped fiber and being configured to thermally extend when heated at a temperature lower than the melting point of the first resin component. The heat extensible fiber has higher heat self-extensibility than conventional extensible fibers.

Abstract: A skin application sheet for being impregnated with a cosmetic preparation is provided which is suitable for a face mask and so on, and causes less irritation to skin, and has good application properties. A splittable conjugate fiber web containing at least 50% by mass of splittable conjugate fibers is placed on one surface or both surfaces of a hydrophilic nonwoven containing at least 50% by mass of hydrophilic fibers and hydroentanglement treatment is conducted to split the splittable conjugate fibers into ultrafine fibers with a fineness of 0.5 dtex and to form a ultrafine fiber layer containing at least 10% by mass of the ultrafine fibers and to integrate the hydrophilic nonwoven and the ultrafine fiber layer so that a sheet is obtained. This sheet is impregnated with the cosmetic preparation and used in such a manner that the ultrafine fiber layer is a skin contact surface.