Abstract: An adhesive-treated polyester fiber cord having a high adhesion to non-vulcanized rubber, a high resistance to separation of fibers or filaments from each other, and being useful as a reinforcing cord for producing a rubber composite material such as belt having high dimensional stability and power transmission property, is produced by first impregnating a material cord a first adhesive liquid containing a polyepoxide compound and a blocked polyisocyanate compound in solid weight ratio of 1/3-1/15, by heat treating it at 160-240° C., by second treating the treated cord with a second adhesive liquid containing a resorcinol-formaldehyde resin and a rubber latex in a solid weight ratio of 1/3-1/15, by heat treating it at 180-240° C., by third treating the treated cord with a third adhesive liquid containing a resorcinol formaldehyde resin (resorcinol/formaldehyde molar ratio: 1/0.6-1/1.

Abstract: A flat optical-interference-functional fiber formed by alternately laminating individually independent layers of polymers having different refractive indices in parallel with the major axis direction of its flat cross section, characterized in that (a) the ratio (SP ratio) of the solubility parameter value (SP1) of high refractive index polymer to the solubility parameter value (SP2) of low refractive index polymer is in the range of 0.8≦SP1/SP2≦1.1, and a fibrous structure using the fiber. According to the present invention, there are provided a fiber which has high color development intensity based on optical interference and forms clear color; and a fibrous structure thereof.

Abstract: A color-developing composite short fiber having a length of 0.01 to 100 mm is obtained by cutting a color-developing short fiber capable of reflecting visible rays and interfering therewith consisting of two or more kinds of polymer compounds having different refractive indices which are laminated alternately, while a color-developing structure is formed by binding particles of the short fiber one another, dispersing the short fiber in or mixing it with other materials to be bound therewith or adhering the short fiber on the surface of a support. Further, a color-developing composite short fiber having a length of 0.

Abstract: A color-developing composite short fiber having a length of 0.01 to 100 mm is obtained by cutting a color-developing short fiber capable of reflecting visible rays and interfering with visible rays consisting of two or more kinds or polymer compounds having different refractive indices which are laminated alternately. A color-developing structure is formed by binding particles of the short fiber to one another, dispersing the short fiber in a mixture with other materials or adhering the short fiber on the surface of a support. Further, a color-developing composite short fiber having a length of 0.01 to 100 mm is obtained by cutting a color-developing composite fiber comprising two or more polymer compounds having different refractive indices which are laminated alternately forming a layer capable of reflecting visible rays and interfering therewith and a layer capable of reflecting invisible rays and interfering therewith.

Abstract: A fiber structure with a cross section having x-axis and y-axis directions includes an alternate lamination including a first portion having a refractive index na and a thickness da and a second portion adjacent to the first portion and having a refractive index nb and a thickness db, wherein when 1.0≦na<1.8, 1.3≦nb≦1.8, and 1.01≦nb/na≦1.80, a primary peak wavelength &lgr;1 which is equal to 2(nada+nbdb) is given by &lgr;1≧0.78 or 1.6 (&mgr;m).

Abstract: A fiber structure includes alternate lamination including a predetermined number of a first portion having a refractive index na and a thickness da, and a second portion adjacent to the first portion and having a refractive index nb and a thickness db, wherein when the refractive index na is given by 1.3≦na, and a ratio nb/na is given by 1.01≦nb/na≦1.20, a reflection peak wavelength &lgr; is equal to 2(nada+nbdb). Such fiber structure is used in a textile.

Abstract: A fiber with a cross section having x-axis and y-axis directions includes an alternate lamination including a predetermined number of a first portion and a second portion adjacent thereto, which have different optical characteristics, and a clad arranged around the alternate lamination.

Abstract: A polyethylene naphthalate fiber of the present invention comprises a naphthalate-based copolyester in which at least 85 mol % or more of the total of recurring units is an ethylene 2,6-naphthalate unit, and it is obtained by copolymerizing an alkylene oxide adduct of a divalent phenol expressed by the following general formula (I) in an amount of 1 to 15 mol % as a part of the diol component. H—(OA)m—O—Ar—O—(AO)n—H  (I) In the formula, A expresses an alkylene group having a carbon number of 2 to 4, m and n are same as or different from each other, and each express an integer of 1 to 5, and Ar expresses a p-phenylene group, an m-phenylene group or a group of the following general formula (II) —Ph—X—Ph—  (II) In the formula, Ph expresses a p-phenylene group, and X expresses a 2,2-propylene group, a sulfone group, a methylene group, an oxygen atom or a sulfur atom.

Abstract: A polyester filament yarn produced by a melt-spinning a mixture of a polyester resin with 0.4 to 4.0 weight % of filament elongation-enhancing agent particles and taking up the filament yarn at a speed of 2500 to 8000 m/minutes, having an increase in residual elongation of 50% or more and exhibiting an improved winding performance, wherein the filament elongation-enhancing agent particles satisfies the requirements (a), (b) and (c):(a) the particles have a thermal deformation temperature of 105 to 130.degree. C.,(b) provided that the polyester filaments have a non-hollow circular cross-section, the distribution density of the particles is maximized in an annular area between two concentric circles around the center of the cross-section, of which the two concentric circles have radiuses corresponding to 1/3 and 2/3 of the radius of the cross section, respectively; and(c) the number of the particles appearing on the filament surfaces is 15 particles/100 .mu.m.sup.2 or less.

Abstract: A composite polymer fiber is produced employing at least two polymer compounds according to a process for producing a composite polymer fiber including the steps of supplying at least two polymer compounds; forming a belt flow by arranging alternately unmixed strips of the polymer compounds supplied; and injecting the belt flow after it is compressed such that the thickness of the belt flow may be longer than the width thereof and that multiple layers of the polymer compounds may be parallel to the longer axis of the fiber. According to this process, there is obtained a fiber having a multilayered structure, in which the thickness of each layer can be controlled with optical accuracy since the multilayered structure is formed in one step, and also having a rectangular cross section in which each layer in the fabric is oriented parallel to the longer axis of the fiber, so that the layers can be easily oriented, when woven into a fabric, in such a direction as to obtain high-intensity coherent beams of light.

Abstract: A spinning dope for the stable production of a cellulose diacetate fiber at a high productivity rate, such fiber being almost free from the occurrence of fluffs and excellent in strength and elongation properties. The spinning dope is a composition formed of (1) acetone or a solvent containing acetone and 0 to 5% by weight, based on the acetone, of water or methanol, (2) 24 to 33% by weight, based on the total weight of the composition, of cellulose diacetate, and (3) at least a phthalate ester, an aliphatic dibasic acid ester, a fatty acid ester, a phosphate ester, an epoxy plasticizer or a glycol-ester-containing plasticizer; and the composition has a thixotropy index (I), represented by the following equation, of at least 1.3,I=.eta..sub.6 /.eta..sub.60wherein .eta..sub.6 and .eta..sub.60 are viscosity measured with a Brookfield viscometer at a rotor rotation of 6 rpm and 60 rpm, respectively, and 35.degree. C.

Abstract: A polyester filament yarn made by treating a polyester filament with an aqueous alkali solution, which filament is composed of a core extending over the length of filament and a plurality of fins bonded to the core over the length of the core and radially extending from the core, and which satisfies the following three requirements:(1) 1/20.ltoreq.SB/SA.ltoreq.1/3,(2) 0.6.ltoreq.LB/DA.ltoreq.3.0, and(3) WB/DA.ltoreq.1/4wherein SA and DA are cross-sectional area and diameter of the core, and SB, LB and WB are cross-sectional area, maximum length and maximum width of the fins, respectively. The fins are at least partially separated from the core by the alkali treatment. A fabric composed of the filament yarn has soft touch and feeling, high bulkiness and uniform appearance.

Abstract: The disclosed reinforcement sheet is a knitted fabric formed from a plurality of reinforcing yarns 5 and a plurality of matrix yarns 9, wherein the reinforcing yarns are held in the linear state without being bent, arranged in parallel to and spaced from one another in a matrix knitting structure, and the matrix yarns cover the linear reinforcing yarns, without bending the linear reinforcing yarns, to form the matrix knitting structure.

Abstract: A method for producing a textured polyester yarn, especially in an in-draw texturing system, in which starting yarn is processed by means of a non-touch type heater under a heater temperature in a range of from 350.degree. C. to 800.degree. C. and a shorter processing time in a range of from 0.04 second to 0.12 second. The dyeing evenness of the fabric made from the resultant yarn is improved because the dyeability of the yarn is almost constant despite fluctuation of the heater temperature. A belt-type twister is preferably utilized for false-twisting a yarn rather than a disc type.

Abstract: Polyester conjugate crimped yarns prepared by conjugate spinning(1) an A component substantially comprising polybutylene terephthalate and(2) a B component substantially comprising polyethylene terephthalateat a weight ratio of 30:70 to 70:30 in a side-by-side or eccentric sheath-core arrangement, rendered crimpable by false twisting to a degree of crimpability TC.sub.10 of 8% or more when subjected to a boiling water treatment under a load of 10 mg/de. The polyester conjugate crimped yarn can be obtained by subjecting the conjugate yarn to single-heater false twisting under the conditions which satisfy the following relations:TW.gtoreq.24380/.sqroot.De (i)185+50 [.eta.]B.gtoreq.T.gtoreq.150 (ii)whereTW is the number of false twists (T/m);De is the total denier of the yarn after false twisting;T is the temperature in 0.degree. C. of the false twister heater;[.eta.]B is the intrinsic viscosity of the B component.

Abstract: A conjugate filamentary yarn, which is prepared from composite components respectively comprising thermoplastic elastomer and non-elastomeric polyamide or polyester, and each of the individual constituents has a cross section of a compressed flat shape like a cocoon or oval, is provided. Hereby, a highly stretchable crimped elastic yarn, in which stretchability arising from crimp and rubber-like elasticity resulting from elastomer are utilized to the utmost, is made available with economy.

Abstract: A thermally improved polyester weft yarn is provided by melt-spinning a blend of a polyethylene terephthalate polymer and a small amount of polymer having a glass transition temperature of at least 10.degree. C. higher than that of the polyethylene terephthalate polymer. The yarn has a break elongation of 70% to 200% and a dry heat shrinkage of +5% to -2%, and is capable of withstanding a severe heat-treatment, for example, at 245.degree. C. for 2 minutes during dipping and curing process of a tire cord fabric comprising the same. Even after such heat-treatment, the yarn shows a residual break elongation of more than 60%. Thus, the weft yarn extends uniformly, without breakage, to a toroidal shape during a tire building process, keeping warp cords at a equi-distance relation. A tire cord fabric comprising the weft yarn of the invention finds its use as the carcass in the form of single ply in a radial tire.

Abstract: Thermoplastic synthetic filaments having a properly delustered appearance and an adequate frictional property, comprise 85 to 99% by weight of a thermoplastic matrix polymer and 1 to 15% by weight of a dispersed polymer which is incompatible with the matrix polymer and uniformly dispersed in the form of fine particles in the matrix polymer, and are characterized by numerous fine protuberances consisting of the dispersed polymer and formed in the number of at least 5 per 10 .mu..sup.2 on the peripheral surface of each individual filament, the protuberances preferably being each in the form of a hemisphere, hemispheroid or hemiellipsoid extending along the longitudinal axis of each individual filament.

Abstract: Process and apparatus for controlling a filament pad in the stuffing chamber of a pneumatic crimper and for imparting an improved filament cohesion to the crimped filament yarn within said crimper.