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Fluorescent elastic yarn and method for producing the sameRelated Patent Categories: Stock Material Or Miscellaneous Articles, Coated Or Structually Defined Flake, Particle, Cell, Strand, Strand Portion, Rod, Filament, Macroscopic Fiber Or Mass Thereof, Rod, Strand, Filament Or Fiber, Coated Or With Bond, Impregnation Or CoreFluorescent elastic yarn and method for producing the same description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060029800, Fluorescent elastic yarn and method for producing the same. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is a Continuation-in-Part of application Ser. No. 10/238,936, filed Sep. 9, 2002, which application is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the invention [0003] The present invention relates, in general, to a fluorescent elastic yarn and a method for producing the same. In particular, the present invention relates to a fluorescent elastic yarn which is finished with the spinfinish oil containing the fluorescent agent which can fluoresce sufficiently to allow a fine elastic yarn to be seen by the naked eye when ultraviolet light is irradiated to the fluorescent elastic yarn, and a method of producing the same. [0004] 2. Description of the Prior Art [0005] An elastic yarn has been applied to various fields, and a process of knitting and weaving the elastic yarn covered with a natural fiber has been widely used in the art. Various types of elastic yarns, for example, a core spun yarn (CSY) in which cotton or a rayon fiber is covered on the elastic yarn, and a covered yarn in which a synthetic fiber such as nylon and polyester is covered on the elastic yarn, are used to produce elastic textile fabrics or knitted goods requiring elasticity. [0006] However, there is a problem during a covering process of the elastic yarn in that a breakage of the elastic yarn cannot be discovered in real time, and so inferior products having only the covered yarn wound without the elastic yarn to be inserted may be produced. This problem causes a reduction in productivity of the covered elastic yarn and a waste of the covered yarns. Accordingly, there remains a need for the development of a novel method capable of finding effectively a breakage of the elastic yarn in real time. In addition to this necessity, there is a definite need for a tracer applied to the elastic yarn which can be easily removed from the elastic yarn under routine scouring process. [0007] In a conventional art, titanium-based or magnesium-based inorganic additives have been added into the elastic yarn, and these inorganic additives may emit a faint dark violet ray when irradiated by ultraviolet light. However, these inorganic additives have not been added into the elastic yarn to find a breakage of the elastic yarn, but rather to improve dulling effect, anti-blocking property, and chlorine resistance, and so the inorganic additives are definitely not classified as tracers for a yarn breakage. [0008] Even though these inorganic additives may be added to the elastic yarn to find a yarn breakage, this method is disadvantageous in that when thickness of the elastic yarn is less than 40 deniers, or a small capacity device such as a portable UV irradiator generally used in a workplace is used to identify a breakage of the elastic yarn, it is impossible to find the breakage of elastic yarn strand inside of hard fibers covered on. Accordingly, in case of the conventional method, the existence of the elastic yarn inside of the covered yarn can be identified under a stationary high power UV light only after the covering process is finished and the covered yarn products are manufactured. SUMMARY OF THE INVENTION [0009] Therefore, it is a feature of the present invention to provide a fluorescent elastic yarn which can be discriminated by fluorescence when ultraviolet light is irradiated to it. [0010] It is another feature of the present invention to provide a method for producing the fluorescent elastic yarn. [0011] It is yet another feature of the present invention to provide a hard fiber-covered fluorescent elastic yarn using the fluorescent elastic yarn. [0012] In accordance with an aspect of the present invention, there is provided a method for producing a fluorescent elastic yarn comprising the step of finishing the fluorescent elastic yarn with spinfinish oils whose main components are a silicone oil, a hydrocarbon oil(in other words, paraffin oil) and a fluorescent agent capable of being soluble or dispersed effectively in the hydrocarbon oil, and being scoured easily in a routine scouring process, wherein the content of fluorescent agent ranges from 0.001 to 1 wt % of a resulting elastic yarn weight. [0013] In accordance with another aspect of the present invention, there is provided a method for producing a hard fiber-covered fluorescent elastic yarn, comprising the step of covering a core yarn, wherein the core yarn is the fluorescent elastic yarn. DETAILED DESCRIPTION OF THE PRESENT INVENTION [0014] A segmented polyurethaneurea useful for production of a fluorescent elastic yarn of the present invention is produced by reacting organic diisocyanate with polydiol to produce a capped glycol, and then dissolving the capped glycol in an organic solvent and reacting with diamine and monoamine. [0015] The organic diisocyanate used to produce the segmented polyurethaneurea includes, not limited to, diphenylmethane-4,4'-diisocyan- ate, hexamethylenediisocyanate, toluenediisocyanate, butylenediisocyanate, and hydrogenated P,P-methylenediisocyanate. [0016] The polydiol used to produce the segmented polyurethaneurea includes, not limited to, polytetramethylene ether glycol, polypropylene glycol, and polycarbonate diol. [0017] Furthermore, a diamine such as ethylene diamine, propylene diamine, and hydrazine can be used as a chain extender, and a monoamine such as diethylamine, monoethanol amine, and dimethyl amine can be used as a chain termination agent. [0018] The hard fiber useful for covering the elastic yarn according to the present invention may be cotton, rayon, nylon, polyester, or cellulose. [0019] The fluorescent agent may be added into a spinfinish oil which is applied to elastic yarn strands posterior to the spinning process, and prior to the winding process around a paper cores. The fluorescent agent is added to the elastic yarn in such an amount that a fluorescent agent content ranges from 0.001 to 1 wt % in the resulting elastic yarn. [0020] When the fluorescent agent content is less than 0.001 wt %, the fluorescent effect is poor. On the other hand, when the content is more than 1 wt %, dispersibility or solubility of the fluorescent agent in a spinfinish oil is the worst and so the fluorescence of the fluorescent elastic yarn is non-uniform throughout the yarn package though the fluorescence is the brightest. In addition, the fluorescent elastic yarn cannot be produced economically due to the heavy cost of the fluorescent agent and serious winding discontinuity problems. [0021] The fluorescent agent used in the present invention include, not limited to, a stilbene-based fluorescent agent, a pyrazolone-based fluorescent agent, an imidazole-based fluorescent agent, an oxazole-based fluorescent agent, a coumarin-based fluorescent agent, a rhodamine-based fluorescent agent, and a fluorescein-based fluorescent agent. Specific examples of each fluorescent agent are as follows: Continue reading about Fluorescent elastic yarn and method for producing the same... Full patent description for Fluorescent elastic yarn and method for producing the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Fluorescent elastic yarn and method for producing the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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