Abstract: By forming a meta-type wholly aromatic polyamide fiber using a highly hydrophobic UV absorber and having specific physical properties, a meta-type wholly aromatic polyamide fiber having light resistance, which can be dyed in various hues by carrier dyeing and in which the shedding of a light stabilizer during dyeing can be suppressed, is provided. That is, the meta-type wholly aromatic polyamide fiber contains a UV absorber with a water solubility of less than 0.04 mg/L and has a degree of dye exhaustion of 90% or more in the form of a dyed fiber and a light resistance retention of 80% or more after carrier dyeing.

Abstract: There is provided a novel meta-type wholly aromatic polyamide fiber which has a high breaking strength and can inhibit coloration or discoloration under high temperatures, while retaining latent properties of the meta-type wholly aromatic polyamide fiber, such as heat resistance and flame retardancy. Components or conditions of a coagulation bath are appropriately controlled so as to give a dense coagulation state having no skin-core structure, plastic stretching is performed within a specific ratio, and further, subsequent heat stretching conditions are made proper, thereby obtaining a meta-type wholly aromatic polyamide fiber containing substantially no layered clay mineral, in which the amount of solvent remaining in the fiber is 1.0% by mass or less based on the whole fiber, and the breaking strength of the fiber is from 4.5 to 6.0 cN/dtex.

Abstract: There are provided a laminated fabric for protective clothing capable of achieving both higher heat shielding properties and comfort properties, and protective clothing using the same. A laminated fabric for protective clothing comprising two or more fabric layers including an outer layer and an inner layer, with the inner layer disposed on a skin side, when used in protective clothing, wherein the outer layer is a fabric composed of a fiber having an LOI value (limiting oxygen index) of 21 or more measured by JIS L 1091 E method, the inner layer is a fabric composed of a fiber having an LOI value (limiting oxygen index) of 21 or more measured by JIS L 1091E method, and a thermal diffusivity of 2.2×10?6 m2·s?1 or more, and the fabric has a porosity ranging from 85% to 98%, a thickness ranging from 0.5 mm to 8.0 mm and a basis weight ranging from 80 g/m2 to 250 g/m2, and further, protective clothing using this laminated fabric for protective clothing.

Abstract: An aromatic polyamide fiber comprising an aromatic polyamide containing a structural repeating unit of the following formula (1), and a structural repeating unit of the following repeating unit (2) in an amount of 30 mol % or more to the whole amount of the aromatic polyamide structural units, the fiber having strength of 20 cN/dtex or more and modulus of elongation of 500 cN/dtex or more: wherein Ar1 and Ar2 each independently represent an unsubstituted or substituted divalent aromatic group.

Abstract: There is provided an easily dyeable meta-type wholly aromatic polyamide fiber excellent in dyeability and acid resistance, and having a very small residual solvent content. The components or conditions of the coagulation bath are appropriately adjusted so as to achieve a coagulated form not having a skin core, plasticization drawing is performed at a specific ratio, and after completing a washing step, a dry heat treatment is performed at a specific temperature.

Abstract: [Problems] To provide a resin composition having excellent flame retardancy and a fiber having excellent flame retardancy, without deteriorating conventional mechanical properties by adding a small amount of a flame-retardant additive. [Means for Resolution] A flame-retardant resin composition comprising a resin and composite particles in an amount of 1% by weight or more based on the resin, which are mainly composed of titanium dioxide and silicon dioxide and have a titanium dioxide content of 10 to 30% by weight and a silicon dioxide content of 70 to 90% by weight, a flame-retardant fiber obtained by fiberizing this flame-retardant resin composition, a heat-resistant cloth using this flame-retardant fiber, and further, protective clothing using this cloth.

Abstract: Wholly aromatic polyamide fibers having non-fusible fine powder attached to a surface thereof in an amount of from 1.5 to 14 mg/m2, which are good in process stability in working processes, and exhibit excellent reinforcing effect upon using as a reinforcing material of rubber, resins and the like.

Abstract: This invention is to provide a dope that has excellent formability and can be formed into a fiber, a film, pulp-shaped particles and the like by a wet method. This invention is also to provide a process for the production of a fiber excellent in heat resistance, strength and elastic modulus. This invention provides a dope and a process for the production of a fiber from the dope, the dope including a polyamide and a basic solvent, the polyamide containing a recurring unit of the following formula (I), wherein Ar1 represents at least one substituent selected from the group consisting of and having an inherent viscosity of 1.0 or more, the dope has a polyamide concentration of over 10% by weight but not more than 25% by weight and exhibits optical anisotropy at 50° C.

Abstract: According to the invention, by preparing a solution of an aromatic copolyamide obtained by copolymerization of a specific third component, a spinning solution is stabilized even without using an alkali metal salt and a uniform aromatic copolyamide nanofiber can be obtained stably by an electrospinning method. Further, according to the invention, a fiber structure obtaining laminating a salt-free aromatic copolyamide nanofiber can be stably formed. Therefore, it can be applied to a product having no preference for ionic contamination of an alkali metal salt or the like, for example, a filter for gas or liquid filtration or an electronic component separator, and is useful in the textile industry.

Abstract: Para-type aromatic polyamide short fibers are attached with a phosphate ester alkali metal salt of an alcohol having a carbon number of 12 having a molar fraction of a monoester salt of from 45 to 70% by mol and a molar fraction of a diester salt of from 10 to 40% by mol in an amount of from 0.05 to 1.0% by weight based on the weight of the fibers, whereby such para-type aromatic polyamide short fibers excellent in spinning property are obtained that are excellent in bundling property and antistatic property, and are low in adhesion property causing less twining on rollers and less formation of scums.

Abstract: There are provided a rigid heterocyclic polymer comprising rigid recurring units such as units represented by the following formulae (a) and (b): wherein X is O, S or NH, a production process thereof, and fibers comprising the polymer.

Abstract: An aromatic polyamide fiber comprising an aromatic polyamide containing a structural repeating unit of the following formula (1), and a structural repeating unit of the following repeating unit (2) in an amount of 30 mol % or more to the whole amount of the aromatic polyamide structural units, the fiber having strength of 20 cN/dtex or more and modulus of elongation of 500 cN/dtex or more: wherein Ar1 and Ar2 each independently represent an unsubstituted or substituted divalent aromatic group.

Abstract: The canvas of the present invention for forming a rough surface of toothed belt is formed from warp yarns which are formed from composite yarns each comprising a core yarn comprising, as a principal component, half-drawn synthetic fiber yarns having an elongation at break of 50 to 200% and a covering yarn wound around the core yarn, comprising, as a principal component, high mechanical strength, high treat resistant fibers and preferably twisted at a twist number of 300 to 4000 turns/m, and weft yarns; and has a capability of being easily produced by meaning, uniform appearance and yarn distribution and excellent abrasion resistance.

Abstract: A two-layer fabric according to the present invention has an integral structure containing a base cloth on the upper side and a reinforcing cloth for reinforcing the entire fabric on the under side, wherein (a) the base cloth of the two-layer fabric is flame-retardant and contains a warp yarn and a weft yarn containing 30% by weight or more of a flame-retardant fiber having a limiting oxygen index (LOI) of 26 or more and a tensile strength of 8 cN/dtex or less, (b) the reinforcing cloth of the two-layer fabric contains a warp yarn and a weft yarn containing a heat-resistant high-strength fiber having a tensile strength of 15 cN/dtex or more as a main component, and (c) the base cloth and the reinforcing cloth are connected by the warp yarn and/or the weft yarn of the base cloth, to form the integral structure. Further, a heat-resistant protective clothing contains an outer fabric layer of the two-layer fabric, stacked and sutured by sewing.

Abstract: The object of this invention is to provide a dope that has excellent formability and can be formed into a fiber, a film, pulp-shaped particles and the like by a wet method. The object of this invention is also to provide a process for the production of a fiber excellent in heat resistance, strength and elastic modulus. This invention provides a dope and a process for the production of a fiber from the dope, the dope comprising a polyamide and a basic solvent, the polyamide containing a recurring unit of the following formula (I), wherein Ar1 represents at least one substituent selected from the group consisting of and having an inherent viscosity of 1.0 or more, the dope has a polyamide concentration of over 10% by weight but not more than 25% by weight and exhibits optical anisotropy at 50° C.

Abstract: An isotropic fiber-reinforced thermoplastic resin sheet wherein a chopped strand prepreg comprising a thermoplastic resin and a reinforcing fiber is layered so that the fiber orientation is random, the prepreg having a fiber volume fraction (Vf) of 20% to 50%, a length in the fiber axis direction of 15 to 45 mm, and a thickness of no greater than 0.13 mm, and the layered material is molded into sheet form by heating and pressing, and a molded plate obtained from the isotropic fiber-reinforced thermoplastic resin sheet. Even if the volume fraction of the reinforcing fiber is relatively low, a fiber-reinforced thermoplastic resin sheet and a molded plate that are excellent in terms of mechanical properties and their uniformity can be obtained.

Abstract: The object of this invention is to provide a dope containing a polyamide having a hydroxyl-group-possessing aromatic ring, which exhibits optical anisotropy and has excellent formability, and the dope contains a polymer having a recurring unit of the following formula (I), wherein Ar1 is and having an inherent viscosity of 1.0 or more and a strong-acidity solvent, has a polymer concentration of 5 to 30% by weight and exhibits optical anisotropy at 50° C.

Abstract: There are disclosed a carbon fiber strand for reinforcement of thermoplastic resin, wherein a sizing agent containing a resin composition obtained by mixing a component [A], i.e. an acid-modified polyolefin copolymer having a weight-average molecular weight of 15,000 to 150,000, which has, as the main chain, an ethylene-propylene copolymer, a propylene-butene copolymer or an ethylene-propylene-butene copolymer and in which the main chain has been modified with 0.1 to 20% by mass of an unsaturated carboxylic acid, and a component [B], i.e. an acid-modified polypropylene having a weight-average molecular weight of 3,000 to 150,000, which has, as the main chain, a polypropylene and in which the main chain has been modified with 0.1 to 20% by mass of an unsaturated carboxylic acid, at a mass ratio of 1:20 to 10:5, is adhered to 100 parts by mass of a carbon fiber in an amount of 0.1 to 8.

Abstract: Upon producing a meta-type wholly aromatic polyamide fiber by wet spinning a polymer solution containing a meta-type wholly aromatic polyamide containing a m-phenylenediamine isophthalamide skeleton as a major component, and an amide solvent containing a salt, (1) the polymer solution is ejected into a coagulation bath containing an amide solvent and water and containing a salt at a low concentration to coagulate as a porous thread body (fibrous material), (2) which is subsequently stretched in a plastic stretching bath containing an aqueous solution of an amide solvent, (3) is rinsed with water and then subjected to a heat treatment in a saturated steam atmosphere, and (4) is then subjected to a dry heat treatment, so as to produce a novel meta-type wholly aromatic polyamide fiber that contains an extremely small amount of a solvent remaining in the fibers, contains a small amount of a volatile substance harmful in a heat treatment step at a high temperature, is capable of suppressing coloration of a fiber p

Abstract: Para-type aromatic polyamide short fibers are attached with a phosphate ester alkali metal salt of an alcohol having a carbon number of 12 having a molar fraction of a monoester salt of from 45 to 70% by mol and a molar fraction of a diester salt of from 10 to 40% by mol in an amount of from 0.05 to 1.0% by weight based on the weight of the fibers, whereby such para-type aromatic polyamide short fibers excellent in spinning property are obtained that are excellent in bundling property and antistatic property, and are low in adhesion property causing less twining on rollers and less formation of scums.