Abstract:
A sheet comprising a non-woven fabric in which ultra-fine fibers of a single fiber thickness of 0.5 dtex or less are entangled and an elastomeric binder mainly composed of a polyurethane, wherein said polyurethane is a polycarbonate-based polyurethane having a polycarbonate skeleton represented by the following general formulas (1) and (2), and having a gelation point of 2.5 ml or more and less than 6 ml. (In the formula, R 1 and R 2 are aliphatic hydrocarbon groups with 7 to 11 carbons, and they may be same or different. Furthermore, n and m are positive integers, and when R 1 and R 2 are different, it is a block copolymer or a random copolymer) (In the formula, R 3 and R 4 are aliphatic hydrocarbon groups with 3 to 6 carbons, and they may be same or different. Furthermore, x and y are positive integers, and when R 3 and R 4 are different, it is a block copolymer or a random copolymer)
Abstract:
Una lámina que comprende una tela no tejida en la cual están entrelazadas fibras ultrafinas de una única fibra con finura de 0,5 dtex o menos y un aglutinante elastomérico compuesto principalmente de un poliuretano, en donde dicho poliuretano es un poliuretano a base de policarbonato que tiene una estructura de policarbonato representado por las fórmulas generales (1) y (2) siguientes, y que tiene un punto de gelificación de 2,5 ml a 6 ml, en donde el punto de gelificación se corresponde con la cantidad de agua aplicada en gotas cuando una solución se vuelve ligeramente turbia debido al inicio de la coagulación de poliuretano cuando se aplica agua destilada en gotas a 100 gramos de una solución de poliuretano al 1 % en peso en N,N'-dimetilformamida que tiene un contenido de agua del 0,03 % o menos mientras se agita a una temperatura de 25 ºC ± 1 ºC;**Fórmula** en la fórmula, R1 y R2 son grupos hidrocarburo alifático con 7 a 11 átomos de carbono, en la que cada uno de R1 y R2 tiene un grupo hidrocarburo alifático de cadena larga que tiene de 7 a 11 átomos de carbono en la cadena, que pueden ser iguales o diferentes; además, n y m son números enteros positivos y cuando R1 y R2 son diferentes es un copolímero de bloque o un copolímero aleatorio;**Fórmula** en la fórmula, R3 y R4 son grupos hidrocarburo alifático con 3 a 6 átomos de carbono, en la que cada uno de R3 y R4 tiene un grupo hidrocarburo alifático de cadena corta que tiene de 3 a 6 átomos de carbono en la cadena, y pueden ser iguales o diferentes; además, x e y son números enteros positivos y cuando R3 y R4 son diferentes es un copolímero de bloque o un copolímero aleatorio.
Abstract:
A sheet comprising a non-woven fabric in which ultra-fine fibers of a single fiber thickness of 0.5 dtex or less are entangled and an elastomeric binder mainly composed of a polyurethane, wherein said polyurethane is a polycarbonate-based polyurethane having a polycarbonate skeleton represented by the following general formulas (1) and (2), and having a gelation point of 2.5 ml or more and less than 6 ml. (In the formula, R 1 and R 2 are aliphatic hydrocarbon groups with 7 to 11 carbons, and they may be same or different. Furthermore, n and m are positive integers, and when R 1 and R 2 are different, it is a block copolymer or a random copolymer) (In the formula, R 3 and R 4 are aliphatic hydrocarbon groups with 3 to 6 carbons, and they may be same or different. Furthermore, x and y are positive integers, and when R 3 and R 4 are different, it is a block copolymer or a random copolymer)
Abstract:
A sheet comprising a non-woven fabric in which ultra-fine fibers of a single fiber thickness of 0.5 dtex or less are entangled and an elastomeric binder mainly composed of a polyurethane, wherein said polyurethane is a polycarbonate-based polyurethane having a polycarbonate skeleton represented by the following general formulas (1) and (2), and having a gelation point of 2.5 ml or more and less than 6 ml. (In the formula, R 1 and R 2 are aliphatic hydrocarbon groups with 7 to 11 carbons, and they may be same or different. Furthermore, n and m are positive integers, and when R 1 and R 2 are different, it is a block copolymer or a random copolymer) (In the formula, R 3 and R 4 are aliphatic hydrocarbon groups with 3 to 6 carbons, and they may be same or different. Furthermore, x and y are positive integers, and when R 3 and R 4 are different, it is a block copolymer or a random copolymer)
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: a sheet-shaped object which is thin and, despite this, has a surface that is dense and is soft to the touch and which has practicable strength; and a process for producing the sheet-shaped object. This sheet-shaped object comprises ultrafine fibers having an average single-fiber diameter of 0.1-7 µm and a polymeric elastomer comprising a polyurethane as a major component, wherein when a layer extending from one surface to a depth of 50% of the thickness is referred to as layer (A) and a layer extending from the other surface to a depth of 50% of the thickness is referred to as layer (B), then the ratio of the density of fibers (A') in the layer (A) to the density of fibers (B') in the layer (B) satisfies the following expression (a) and the ratio of the density of the polymeric elastomer comprising a polyurethane as a major component (A") in the layer (A) to the density thereof (B") in the layer (B) satisfies the following expression (b). The sheet-shaped object as a whole has a density of 0.2-0.6 g/cm 3 . 1>(A')/(B')‰¥0.5 (a) 1>(A")/(B")‰¥0.6 (b)