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:
The present invention provides a sheet like article produced from a polyurethane resin having a carbonate group and an oxycarbonyl group as ester groups and having uniform, elegant surface quality, a flexible, highly crease recoverable texture, and high resistance to light and hydrolysis, and also provides a production method therefore. The sheet like article according to the present invention is one that is produced by adding, as a binder, a polyurethane resin that meets the requirements (I) and (II) given below to a fibrous base material formed mainly of ultrafine fibers: (I) A polyurethane resin such that the polyurethane resin contains, in its interior, an oxycarbonyl group and a carbonate group as ester groups. (II) A polyurethane resin such that the sum of the content of the urethane group and the content of the urea group in the polyurethane resin is 7.0 to 11.0 mass%.
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.
Abstract:
The present invention provides sheet material having good mechanical properties, flexibility, lightweight properties, and quality, and also relates to a production method therefor. The sheet material according to the present invention is one that includes, as constitutional components, an elastic polymer and nonwoven fabric composed mainly of ultrafine hollow fiber with an average monofilament diameter in the range of 0.05 to 10 µm, the ultrafine hollow fiber containing 2 to 60 hollows.
Abstract:
A sheet material includes a fibrous substrate made of microfibers and a hydrophilic-group-containing resin applied to the fibrous substrate. The hydrophilic-group-containing resin has a microphase-separated structure that satisfies Condition I: I. In a phase image obtained by observing an area of 1 µm 2 in a cross-section of the hydrophilic-group-containing resin applied to the fibrous substrate by phase imaging using an atomic force microscope (AFM), a standard deviation of a mode of brightness distribution of areas of 0.2 µm 2 in the area of 1 µ2 is from 0 to 10. Provided are a sheet material that is produced through an eco-conscious production process and yet has such uniformity that is comparable to those of man-made leathers produced using organic-solvent-based polyurethanes, an elegant surface appearance, and a good touch, and a method for producing such a sheet material.
Abstract:
Provided is a base body for an artificial leather comprising a polyester excellent in thermostability during melt molding. That is, provided is a conjugated fiber comprising a polyester which exhibits only a small reduction in intrinsic viscosity during melt molding. The base body for an artificial leather comprises an intertwined fiber body mainly comprising an ultrafine fiber having a 0.01 to 10 µm fiber diameter and an elastic polymer, the ultrafine fiber comprising, as a constituent polymer, a polyester obtained from a dicarboxylic acid and/or an ester-forming derivative thereof, and a diol, the polyester containing 15 to 500 ppm of a 1,2-propanediol-derived component.
Abstract:
An embodiment of the present invention is a nonwoven fabric for pleated filters comprising a sheath-core conjugate filament in which the core component is made of a polymer higher in melting point and the sheath component is made of a polymer lower in melting point, wherein the surfaces of the nonwoven fabric have a plurality of compressively bonded portions dotted by embossing, and the weight per unit area X (g/m ) of the nonwoven fabric and the stiffness Y (mgf) obtained according to the Gurley method of JIS L 1096 satisfy the following formulae: Another embodiment of the present invention is a filter element which uses said nonwoven fabric for pleated filters as a filter medium. The nonwoven fabric for pleated filters of the present invention can be produced by sucking and drawing continuous filaments spun from a sheath-core conjugate spinneret, opening them, stacking them on a travelling net, to form a continuous filament web, preliminarily compressively bonding the web by a pair of heated flat rolls, and then partially thermally compressively bonding it by a pair of embossing rolls. The present invention can provide an excellent high performance nonwoven fabric for pleated filters free from delamination, moderate in stiffness, and good in pleatability and dimensional stability.