Elastic polyurethane thread and manufacturing method thereof

Abstract

In order to provide an elastic polyurethane thread with excellent antibacterial and deodorant properties as well as excellent color fastness, an elastic polyurethane thread is made which consists of polyurethanes which have polymer diols and diisocyanates as the starting materials, contains metallic phosphates in the range of 0.5-10 wt %, and has an emitted quantity of monoamine compounds with molecular weights of 120 or less of 100 μg / m2 or more.

Description

TECHNOLOGICAL FIELD[0001]This invention concerns an elastic polyurethane thread with excellent antibacterial and deodorant properties as well as excellent color fastness; it concerns an elastic polyurethane thread which is idea for obtaining fabrics with antibacterial and deodorant properties, as well as a method for manufacturing it.BACKGROUND TECHNOLOGY[0002]Because of their stretching ability, elastic fibers are widely used in stretching clothing applications, such as leg-ware, inner-ware, support ware, etc., sanitary applications, such as paper diapers and sanitary napkins, and industrial material applications.[0003]In recent years, in a search for more comfortable living environments, a wide range of so-called “antibacterial products” have appeared, such as antibacterial coatings, films and sheets, filaments, toiletry products, kitchen goods, writing implements, sand, tissues, fibers, cosmetics, etc. Similarly, “deodorant products” have also appeared, such as clothing, sleep-wa...

AI Technical Summary

Benefits of technology

[0026]By means of this invention, it is possible to obtain elastic polyurethane threads with excellent stretch abilities and deodorant, antibacterial, and color fastness properties, since they are elastic polyurethane threads the principal constituent ingredients of which are polymer diols and diisocyanates, they contain metallic phosphates, and the emitted quantities of monoamine compounds with molecular weights of 120 or less are 100 μg / m2 or more. Therefore, fabrics using these elastic polyurethane threads have excellent stretch abilities and deodorant, antibacterial, and color fastness properties.SIMPLE EXPLANATION OF DRAWINGS

[0027]FIG. 1: A schematic view showing the dimensions of various parts the package.WORKING EMBODIMENTS OF THE INVENTION

[0029]First, the polyurethanes used in this invention will be explained.

[0030]The polyurethanes used in this invention may be any ones which have polymer diols and diisocyanates as starting materials; they are not particularly limited. Moreover, the methods of synthesizing them are not particularly limited. That is, they may be polyurethane ureas which consist of polymer diols, diisocyamates, and low-molecular-weight diamines, or polyurethane urethanes which consist of polymer diols, diisocyanates, and low-molecular-weight diols. Moreover, they may also be polyurethane ureas which use compounds containing hydroxyl and amino groups in their molecules as chain extenders. It is also desirable to use polyfunctional glycols or isocyanates, etc., with 3 or more functions, within ranges which do not obstruct the effectiveness of the invention.

[0031]The polymer diols are preferably polyether or polester diols, polycarbonate diols, etc. Moreover, it is especially desirable to use polyether diols from the point of view of giving the threads flexibility and ductility.

Problems solved by technology

However, when inorganic antibacterial agents are added to synthetic resins and molding is performed, the molded articles are discolored by the activities of the metals contained in the agents and the effects of the heat at the time of molding and of light shining on the molded objects; thus, the problem of the value of the products being greatly lowered easily arises.

However, although these technologies have shown certain antibacterial and deodorant performances, it cannot be said that the problem of yellowing has been completely solved, since they are greatly discolored by the environment and the passage of time.

However, since the antibacterial agent hinokitiol has been observed to sublimate due to being heated during dry spinning, it is necessary to put an extra amount of it in the spinning dope.

Moreover, since the amount of residual hinokitiol varies with the amount of heat and other spinning conditions, it is difficult to produce elastic polyurethane thread which maintains a stable antibacterial property.

In addition, there is a problem with cost, since hinokitiol, a natural antibacterial agent, is expensive.

However, they have no deodorant effectiveness if they are used by themselves, and there has been a problem with providing both antibacterial and deodorant properties.

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