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

The invention is about a way to make elastic polyurethane threads that have excellent stretch abilities, deodorant, antibacterial, and color fastness properties. These threads are made by using polymer diols and diisocyanates, and they contain metallic phosphates. The invention is also about the use of polyfunctional glycols or isocyanates, etc. Choosing the right starting materials and using specific methods of synthesis can lead to threads that have these desirable properties. The polymer diols can be polyether or polester diols, polycarbonate diols, or other types. It is also important to use polyether diols, as they give 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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