Abstract:
Un material similar a una lámina que comprende un tejido no tejido compuesto de una fibra ultrafina que tiene un diámetro de fibra individual promedio de 0,3 a 7 μm; y una resina elástica, donde la resina elástica es una resina de poliuretano (D), que contiene: como monómeros constituyentes esenciales, un policarbonato diol copolimerizado (A1) que contiene una unidad estructural derivada de alcanodiol C3-5 (a1) y una unidad estructural derivada de alcanodiol C8-12 (a2), siendo la relación molar del alcanodiol (a2) con respecto al número total de moles del alcanodiol (a1) y el alcanodiol (a2) del 50 al 95 % en moles; un policarbonato diol (A2) que contiene una unidad estructural derivada de un alcanodiol C4-6 (a3); un diisocianato orgánico (B); y un prolongador de cadena (C) y la resina de poliuretano (D) cumple las siguientes condiciones (1) a (3): (1) el policarbonato diol copolimerizado (A1) tiene una cantidad de calor de fusión (ΔH) de 40 a 100 J/g, estando la cantidad de calor de fusión (ΔH) determinada de acuerdo con un método de medición del punto de fusión proporcionado en la JIS K7121-1987. (2) El policarbonato diol (A2) tiene una cantidad de calor de fusión (ΔH) de 0 J/g. (3) La diferencia (ΔTm) en el punto de fusión (Tm) entre una mezcla (A12) del policarbonato diol copolimerizado (A1) con el policarbonato diol (A2) y el policarbonato diol copolimerizado (A1) es de 1,5 °C o menos, estando el punto de fusión (Tm) determinado mediante un método de medición del punto de fusión proporcionado en la JIS K7121-1987.
Abstract:
THE OBJECT OF THIS INVENTION IS TO PROVIDE A HIGH PERFORMANCE POLISHING CLOTH HAVING A DENSIFIED SURFACE STATE WITH ULTRAFINE FIBER BUNDLES UNIFORMLY DISPERSED THEREIN AND HAVING EXCELLENT SMOOTHNESS, WHICH COULD NOT BE ACHIEVED BY THE CONVENTIONAL POLISHING CLOTH COMPRISING ULTRAFINE FIBERS. THE POLISHING CLOTH OF THIS INVENTION COMPRISES A NONWOVEN FABRIC FORMED BY ENTANGLING THE ULTRAFINE FIBER BUNDLES FORMED BY BUNDLING ULTRAFINE FIBERS WITH AN AVERAGE SINGLE FIBER DIAMETER OF 0.05 TO 2.0 URN AND A POLYMERIC ELASTIC MATERIAL, WHEREIN THE AVERAGE SIZE OF THE SURFACE FIBER-NAPPED PORTIONS CONSTITUTED BY THE AFOREMENTIONED ULTRAFINE FIBER BUNDLES OF THE AFOREMENTIONED NONWOVEN FABRIC IN THE WIDTH DIRECTION OF THE ULTRAFINE FIBER BUNDLES IS 50 TO 180 µM. [SELECTED DRAWING3
Abstract:
This sheet-like material contains an elastic resin and a non-woven fabric composed of ultrafine fibers having an average single fiber diameter of 0.3-7 µm, wherein the elastic resin is a polyurethane resin (D) which contains: as essential constituent monomers, a copolymerized polycarbonate diol (A1) which contains a structural unit derived from C3-5 alkane diol (a1) and a structural unit derived from C8-12 alkane diol (a2), the molar ratio of the alkane diol (a2) with respect to the total number of moles of the alkane diol (a1) and the alkane diol (a2) being 50-95 mol%; a polycarbonate diol (A2) containing a structural unit derived from C4-6 alkane diol (a3); an organic diisocyanate (B); and a chain extender (C). The sheet-like material has a soft texture and has durability and wear resistance capable of withstanding practical use.
Abstract:
The object of this invention is to provide a high performance polishing cloth having a densified surface state with ultrafine fiber bundles uniformly dispersed therein and having excellent smoothness, which could not be achieved by the conventional polishing cloth comprising ultrafine fibers.The polishing cloth of this invention comprises a nonwoven fabric formed by entangling the ultrafine fiber bundles formed by bundling ultrafine fibers with an average single fiber diameter of 0.05 to 2.0 µm and a polymeric elastic material, wherein the average size of the surface fiber-napped portions constituted by the aforementioned ultrafine fiber bundles of the aforementioned nonwoven fabric in the width direction of the ultrafine fiber bundles is 50 to 180 µm.[Selected drawing] Fig. 1
Abstract:
[Problem] The present invention provides artificial leather including an entangled fiber mass of ultrafine fibers and a polymeric elastomer and having a wet feel and an elegant consistent appearance similar to those of natural nubuck leather, and also provides a production method therefor. [Means of solution] Accordingly, the artificial leather of the present invention is an artificial leather including an entangled fiber mass of ultrafine fibers having a monofilament fineness of 0.01 dtex or more and 0.50 dtex or less and a polymeric elastomer; wherein at least one surface is napped; the cross-sectional profile curve of the napped surface has an arithmetic mean height Pa of 26 µm or more and 100 µm or less; the arithmetic mean height Pa of the cross-sectional profile curve of the opposite surface is 20% or more and 80% or less of the cross-sectional roughness Pa of the napped side; the existence frequency of asperity peaks found in the cross-sectional profile curve of the napped surface is 1.8 or more and 20 or less per 1.0 mm; and a woven or knitted fabric lamination is present near the opposite surface at a depth position of 10% or more and 50% or less.
Abstract:
The present invention provides dyed artificial leather including ultrafine fibers and a polymeric elastomer, having no color unevenness between the ultrafine fibers and the polymeric elastomer, and having good surface quality with high washing fastness, rubbing fastness, and light fastness, and also provides a production method therefor. The dyed artificial leather according to the invention includes a fibrous base containing ultrafine fibers with a filament fineness of 2 decitex or less and a polymeric elastomer, and characterized in that the lightness difference ”L* between the ultrafine fibers and the polymeric elastomer represented by the following equation meet the requirement of -16‰¤”L*‰¤5: ”L * = average lightness L * of ultrafine fibers ˆ’ average lightness L * of polymeric elastomer . The production method for dyed artificial leather according to the present invention is characterized by including a first dying step in which artificial leather constituted mainly of a fibrous base containing ultrafine fibers with a filament fineness of 2 decitex or less and a polymeric elastomer is dyed using a dye and a subsequent second dyeing step performed at a dye concentration that is 0.1% to 30% of the dye concentration (owf) in the first dyeing step.
Abstract:
Provided is an environmentally friendly process for producing a sheet-shaped material having both an elegant, napped appearance and a soft texture, which qualities have not been achieved concurrently, and also exhibiting good abrasion resistance. The process of the present invention for producing a sheet-shaped material comprises the successive steps of: (a) adding a polyvinyl alcohol having a degree of saponification of 98% or more and a degree of polymerization of 800 to 3,500 to a fibrous substrate in an amount of 0.1 to 50% by mass relative to the total mass of fibers in the fibrous substrate; (b) adding a waterborne polyurethane to the fibrous substrate with the added polyvinyl alcohol; and (c) removing the polyvinyl alcohol from the fibrous substrate with the added waterborne polyurethane.