JPH0319964A - Fiber having beautifying action - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to fibers that have whitening and cosmetic effects on human skin.

[Conventional technology]

It has been well known that colloidal sulfur has cosmetic and health effects on human skin. Therefore, products such as soaps, ointments, and sponges containing colloidal sulfur have been proposed. For example, Japanese Patent Publication No. 42-5099 proposes a sponge product containing colloidal sulfur.

However, with regard to fibrous materials, it is known in the art that sulfur is a substance that deteriorates the properties of fibers, and it has been considered in the art that it is desirable to contain as little sulfur as possible. For example, as described in Japanese Patent Publication No. 60-50882, page 4, left column, lines 19 to 29, it was generally believed that sulfur should be removed from fibers as much as possible.

[Problem to be solved by the invention]

The present invention has developed a cellulosic fiber that contains a larger amount of sulfur than previously thought, but which does not cause any practical deterioration of fiber properties and has remarkable whitening and beauty effects over long periods of use. The purpose is to provide.

[Means to solve the problem]

The fibers having whitening and beauty effects of the present invention contain 0.2 to 20% by weight of colloidal free sulfur, and 70% or more of the sulfur content is dispersed in the center of the single fiber cross section. It is characterized by being a cellulose fiber.

The cellulose fibers of the present invention include viscose, cupro, and natural materials such as hemp and cotton. A particularly preferred cellulose is viscose rayon.

First, it is known that viscose rayon contains about 0.1% by weight of sulfur.
It is necessary that the content be at least % by weight. If it contains more than 20% by weight, the production of side reaction substances when sulfur is used increases, resulting in an unpleasant odor.
Furthermore, if a method is adopted in which sulfur is produced at the fiber manufacturing stage, problems such as thread breakage are unavoidable no matter the fineness, and the method has no practical value. The most preferred content range is 1 to IO% by weight.

The fibers of the present invention can be made into yarns or fabrics containing colloidal free sulfur by post-processing. A typical method is to immerse yarn or fabric in an aqueous solution of sodium sulfide or sodium thiosulfate in which sulfur is dissolved, and then remove the material adhering to the fibers and decompose it in an acid solution. .

In the case of viscose rayon, free sulfur can be contained at the same time as yarn production by mixing a sulfur-preserving substance into the spinning solution in addition to post-processing methods. Also in this case, a suitable sulfur generating agent is an aqueous solution of sodium sulfide in which sulfur is dissolved.

The distribution state of colloidal sulfur in the fiber cross section of the present invention is shown in FIG. 1, taking the case of viscose rayon as a typical example. The distribution state of sulfur is concentrated in the center of the fiber cross section, and 70% or more of the total sulfur content is contained in a dispersed state in the central % of the cross-sectional area. Therefore, it has a durable effect and does not easily cause fiber deterioration.

The state of sulfur content can be confirmed by magnifying observation or photographing the cross section of the fiber.

The same whitening and beauty effects can be obtained from a wide range of fiber thicknesses, ranging from 1 to 100 denier.
Desired durability results can be obtained regardless of the denier.

The behavior of the sulfur contained in the cellulose fibers of the present invention is desirable in terms of whitening and beauty effects, and it does not fall off rapidly or at all, and is used as a model for bathing when stirred in hot water at 50°C for 1 hour. Approximately 10% of the content is released into the hot water. In this way, sulfur is released gradually, so that good effects on the skin appear for a long time.

〔Example] The present invention will be explained below using examples.

Example 1 100g/j of an aggregate of viscose rayon filaments consisting of a single yarn of 60 denier! The specimen was immersed in a treatment solution in which 3.0 g/E of sulfur was dissolved in an aqueous sodium sulfide solution.

Thereafter, the treatment liquid adhering to the gaps and surfaces of the fibers was squeezed out to remove as much as possible, and then the fibers were immersed in 140 g/l of sulfuric acid.

When no hydrogen sulfide gas was generated, the filament aggregate was taken out of the acid solution, washed repeatedly with water, air-dried, dried with hot air at 70°C, washed in a washing machine for 1 hour, and then air-dried. The amount of free sulfur contained was measured. The results are shown in Table 1.

Table 1 Also, when the cross section of the fiber was observed under magnification, it was found that a large amount of colloidal free sulfur of about 1 μm was contained in the center of the fiber cross section as shown in FIG.

Example 2 The same method as in Example 1 was used to prepare a treatment agent of 100 g/I! ．． The treatment was carried out using an aqueous solution of sodium thiosulfate. The results are shown in Table 2.

Table 2 Example 3 The fibers shown in Table 3 were treated using a treatment solution in which 25 g/l of sulfur was dissolved in 65 g/l of an aqueous sodium sulfide solution. The resulting sulfur content is shown in Table 3.

As can be seen from the above results in Table 3, free sulfur is contained regardless of the filament denier of the fiber, and there is no significant difference between the viscose rayon and Cublar materials.

Example 4 Viscose rayon 1 on both sides of polyester 9 knitted fabric
A sulfur-containing treatment was carried out using the treatment agent of Example 1 on a flonky-treated cloth in which denier, 0.8 a+/m cut flock was electrostatically flocked. The sulfur content contained in the pile part of the rayon was 2.2% by weight.

It was found that rubbing the skin with this Fronky-treated cloth during bathing gave the user a smooth feeling after use.

Example 5 65 g of sulfur was dissolved in a 100 g/f aqueous sodium sulfide solution 2j2, added to viscose 2042 with a cellulose content of 9% obtained by a conventional method, mixed, and stirred for 1 hour. Spinning speed 6 using a 0.09Mφ 100-hole spinneret
100 filaments of 500 denier were obtained from the above viscose at 0 m/min.

The raw viscose rayon filament yarn was washed with water and then dried with hot air.

The obtained yarn had a strength of 1.57 g per denier and an elongation of 17.9%, which was not much different from ordinary rayon yarn, but it was slightly colored and matte.

The free sulfur content was 2.64% by weight and the total sulfur content was 2.66% by weight. This shows that most of the sulfur is free sulfur. In addition, the sulfur content in the fiber cross section was typically concentrated in the center.

The flocked fabric, which was electrostatically flocked with 1.2 m/m cut flock using the viscose rayon thread thus obtained as a raw material, exhibited good skin beauty effects when used in the bath, as in Example 4. .

Using the same method, we investigated the spinning state and the properties of the resulting fibers by increasing the concentration of dissolved sulfur or by increasing the amount added to viscose. When the content exceeds 4%, spinning becomes extremely difficult due to yarn breakage, the fibers are heavily colored, and the odor is accompanied by a strong hydrogen sulfide odor, making it impractical.

Example 6 The flocked fabric used in Example 4 was treated using the method of Example 1 with the amount of sulfur dissolved in the aqueous sodium sulfide solution set to 1 O g/l, 5 g/l, and 3 g/1. As a result, the content of free sulfur was 0.85% by weight and 0.85% by weight, respectively.
Although the sulfur content was 42% by weight and 0.23% by weight, it was recognized that a sulfur content of 0.2% by weight was necessary as the limit for feeling the effect after use for bathing.

Free sulfur analysis method> Put 2001N1 water, 20g of boric acid, and Log thread into a 500d gas generator, boil for 1 hour while passing nitrogen gas, and after cooling, use phenolphthalein as an indicator.
Neutralize with a solution of N in caustic soda. Next, add 200g/
Add 20 g/f of sodium sulfite and 1 g/f of stearic acid soap, boil for 3 hours while passing nitrogen gas, and after cooling, transfer the liquid to another 500 d beaker. Wash the thread with 100 d of water and add 10 d of 40% formalin and 20 d of acetic acid, sodium acetate buffer. Next, add concentrated acetic acid until pH = 4.6, and add 0. Add a certain amount of IN iodine water to 0. Back titrate the starch with sodium thiosulfate IN to the indicator. The above process is performed in the same way without inserting the yarn as a blank.

FIG. 1 is a diagram showing the state of dispersion of colloidal free sulfur in a cross section of a viscose rayon fiber, which is a representative example of the fiber of the present invention.

g A--0. I N Nag S z O s Titration (d) Blank B--'0. IN-Nag! go = Titration amount (d) Sample g / Single thread collection amount (absolutely dry) g [Effects of the invention] The fiber containing a large amount of free sulfur of the present invention has an effect when used for bathing or for wiping the face and skin. demonstrate.

Fabrics made from the fibers of the present invention have a skin whitening effect and a keratin softening effect, and also have a skin antibacterial effect, so that they are also effective against skin diseases.

[Brief explanation of drawings]

Claims (1)

[Claims] 1. A cellulose fiber containing 0.2 to 20% by weight of colloidal free sulfur and having 70% or more of the sulfur content dispersed in the center of the single fiber cross section.