Abstract: A synthetic fiber capable of absorbing and disabsorbing moisture comprising a component capable of absorbing and disabsorbing moisture and a fiber-forming polymer. The fiber of the present invention has a moisture absorption of 1.5% or more when it is allowed to reach a moisture equilibrium under the circumstance of 25° C.×60%RH and then is allowed to stand for 30 min. under the circumstance of 34° C.×90%RH, and has a moisture disabsorption of 2% or more when it is allowed to reach a moisture equilibrium under the circumstance of 34° C.×90%RH and then is allowed to stand for 30 min. under the circumstance of 25° C.×60%RH. The fiber also has a value of −1 to 5 in terms of b value in the CIE-LAB color system when it is allowed to stand for 30 days.

Abstract: The present invention relates to a nonwoven fabric including a fine denier filament having a plexifilamentary structure in which the disadvantages of polyolefins and of polyesters are offset each other while advantages of them are well utilized with a fine fibrillated structure comprising said filament. The filament comprises a mixture which is at least composed of polyolefin and polyester which are immiscible with each other and has a plexifilamentary structure. The filament is so highly fibrillated that the fibril has not been available yet and, in addition, the filament is with high strength and modulus and exhibits a good dyeing ability. The above-mentioned nonwoven fabric contains the filaments having a plexifilamentary structure in which a mixture of polyolefin and polyester which are immiscible with each other in a mixing ratio within a range of from 5/95 to 95/5 by weight and said filaments are entirely or partially bonded.

Abstract: The present invention relates to a nonwoven fabric including a fine denier filament having a plexifilamentary structure in which the disadvantages of polyolefins and of polyesters are offset each other while advantages of them are well utilized with a fine fibrillated structure comprising said filament. The filament comprises a mixture which is at least composed of polyolefin and polyester which are immiscible with each other and has a plexifilamentary structure. The filament is so highly fibrillated that the fibril has not been available yet and, in addition, the filament is with high strength and modulus and exhibits a good dyeing ability. The above-mentioned nonwoven fabric contains the filaments having a plexifilamentary structure in which a mixture of polyolefin and polyester which are immiscible with each other in a mixing ratio within a range of from 5/95 to 95/5 by weight and said filaments are entirely or partially bonded.

Abstract: The present invention provides a nonwoven fabric made of fine denier filaments of superior bulkiness, heat insulation property and tensile strength, and a production method thereof. This nonwoven fabric is made of fine denier filaments produced by first preparing. First a thermoplastic polymer component "A", then another thermoplastic polymer component "B" which is insoluble in the component "A" and of which the melting point is higher than that of the component "A" by 30.degree. to 180.degree. C. Adopting a bicomponent melt spinning method employing the component "A" and the component "B", the bicomponent conjugate filaments, on which surface at least component "A" is exposed, are obtained. By accumulating these bicomponent conjugate filaments, a web is formed. Then heat is applied to the predetermined areas on the web throughout its entire thickness, whereby only the component A is softened or molten, and the bicomponent conjugate filaments are heat bonded to one another, thus a fleece is obtained.

Abstract: (1) Polyester fiber which consists substantially of polyethylene terephthalate, the fiber being characterized by strength of least 7.0 g/d, initial Young's modulus of at least 85 g/d, elongation of less that 20%, degree of crystallization X.rho. of at least 45% and the ratio of birefringence (.DELTA.n) and the degree of crystallization X.rho. from 0.38 to 0.45.(2) Method of making polyester fiber, characterized as follows: Polyethylene terephthalate is melt spun then passed through the heated cylinder which is installed directly under the spinning die; cooled and solidified; the oil agent is imparted and the yarn is taken-up at the speed of over 2000 m/min; this is drawn to a ratio of 1.5-2.3 in at least 2-drawing stages in continuation; then heat treated; the surface temperature of the drawing rollers at the final drawing stage is kept at 220.degree.-250.degree. C.; a non-contact type heating plate heated to a surface temperature of 250.degree.-500.degree. C.

Abstract: Melt-spun polyester fibers are taken up in the absence of heat at a speed of 5,000 to 6,000 m/min under conditions that satisfy the following relations (IX) and (X), subsequently heat-treating the fibers for a period of from 0.01 to 0.05 seconds with a heating roller while the length of the melt-spun fibers is held constant with no drawing step being provided between the taking up and heat treatment steps, and finally winding up the heated fibers0.04.ltoreq.L/(SSxd).ltoreq.0.08 (IX)1.0.ltoreq.To.ltoreq.1.5 (X)where L is the distance (cm) between the spinneret and the convergence point, SS is the speed (m/min) of a take up roller, To is the spinning tension (g/d) at a point immediately after the convergence point and D is the filament fineness (d) of the fiber wound up and is within the range of from 1 to 3 d.

Abstract: A polyester fiber and process embodiments for the production thereof are described, wherein the polyester fiber is produced by high-speed spinning and is characterized by a filament fineness of from 1 to 3 d, a strength of at least 4.0 g/d, an elongation of up to 40%, a crystallinity (X.rho.) of from 40 to 55%, a birefringence of from 140.times.10.sup.-3 to 165.times.10.sup.-3, an orientation function of from 0.36 to 0.45 in the amorphous portion, and a thermal shrinking stress that satisfies the relations1.1.ltoreq.ST.sub.200 /ST.sub.100 .ltoreq.2.0 (I)and50.ltoreq.ST.sub.max .ltoreq.180 (II),where ST.sub.100 is the shrinking stress (mg/d) at 100.degree. C., ST.sub.200 is the shrinking stress (mg/d) at 200.degree. C., and ST.sub.max is a peak stress (mg/d) on a thermal shrinking stress curve.

Abstract: This invention is a composition for polyester fiber for use in reinforcing, the finish composition being characterized by an oil portion containing a lubricant and 3-30 weight % of a melamine compound.

Abstract: This invention is a method of manufacturing polyester fibers with good adhesion to rubber, characterized in that in the process of spinning polyester fibers, a spinning oil (finish composition) containing an ester of a thiodicarboxylic acid as the principal lubricating agent ingredient and an epoxy compound is added to the polyester fiber which is then heat treated.

Abstract: This invention is a method of treating polyester material for use in reinforcing rubber, the method being characterized by treating the polyester material with a treating liquid containing an epoxy compound and a melamine compound and subsequently heat treating the material at 100.degree.-250.degree. C.

Abstract: This invention is a composition for polyester fiber for use in reinforcing, the finish composition being characterized by an oil portion containing a lubricant and 3-30 weight % of a melamine compound.

Abstract: This invention is a method of manufacturing polyester fibers with good adhesion to rubber, characterized in that in the process of spinning polyester fibers, a spinning oil (finish composition) containing an epoxy compound and a novolak resin made from a dimethylolated phenolic compound and resorcinol is added to the polyester fibers which are then heat treated.

Abstract: This invention is a method of manufacturing polyester fibers with good adhesion to rubber, characterized in that in the process of spinning polyester fibers, a spinning oil (finish composition) containing an epoxy compound and a novolak resin made from a dimethylolated phenolic compound and resorcinol is added to the polyester fibers which are then heat treated.

Abstract: Method of manufacturing polyester fibers with good adhesiveness to rubber, characterized in that in the process of making polyester fiber into yarn, a yarn-making oil (spin finish) containing an epoxy compound and an alkylene oxide adduct of an amine compound containing an alkoxysilane group is added to the polyester fiber, and it is then heat-treated.

Abstract: A method of manufacturing polyester fibers with good adhesion to rubber is disclosed, characterized in that, in the process of spinning polyester fiber, a spinning oil containing an epoxy compound, an ethylene urea compound, and an ethylene urea compound polymerization catalyst is added, and it is then heat treated.

Abstract: This invention is a method of manufacturing polyester fibers with good adhesion to rubber, characterized in that in the process of spinning polyester fiber, a spinning oil (finish composition) containing an epoxy compound and the compound expressed by the general formula ##STR1## (where R is hydrogen, an alkyl group, a cycloalkyl group, or an aryl group; M is an alkali metal or an alkaline earth metal; n is an integer from 0 to 10; and m is 1 when M is an alkali metal and m is 2 when M is an alkaline earth metal) is added to the polyester fiber which is then heat treated.

Abstract: A melt-processable copolyamide prepared from diamines and dicarboxylic acids by a melt-polymerization process, wherein said copolyamide contains from about 1 to 20 mol % of an aromatic amide unit having the formula ##STR1## wherein X and Y are aromatic units with extended bonds, such as 1,4-phenylene group. This copolyamide provides fiber with higher stiffness.

Abstract: This invention is a method for manufacturing polyester fibers with good adhesion to rubber, characterized in that in the process of making the filaments, a filament-making oil (spin finish) containing epoxy, blocked isocyanate, and polyoxyalkylene amine compounds is added to the polyester fibers, and they are then heat-treated.