JPH05331782A - Ultrafine fiber excellent in color development and colorfastness to light and its production - Google Patents

Abstract

PURPOSE:To produce the subject ultrafine fiber excellent in color development and colorfastness to light by preliminarily dyeing an ultrafine fiber with a red- and/or blue-color pigment and subsequently dyeing the fiber with a dye of a color tone different from that of the above-mentioned pigment. CONSTITUTION:The objective ultrafine fiber excellent in color development and colorfastness to light is produced by preliminarily coloring a polymer (preferably polyester-based polymer) with a red- and/or blue-color pigment, spinning it into an ultrafine fiber of <=1d and dyeing the resultant ultrafine fiber with a dye (preferably yellow-color dye excellent in colorfastness to light) of a color tone different from that of the above pigment. The objective ultrafine fiber may be produced by dyeing a conjugated fiber containing the core component composed of a water-insoluble polymer (preferably polyester-based polymer) colored with a red- and/or blue-color pigment and the matrix component (sea component) composed of a water-soluble polymer (e.g. polyester-based polymer synthesized by using 5-sodium sulfoisophthalate as a comonomer unit) with a different-color tone dye (preferably yellow dye excellent in colorfastness to light). The obtained ultrafine fiber is suitable for a car seat material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrafine fiber excellent in color developability and light resistance and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, it has been extremely difficult for an ultrafine fiber to have both sufficient color development and light resistance because of the essential problem of its fineness.

In particular, car seat materials are required to have long-term stability under severe conditions, and the criteria for deep color development and light resistance are increasingly strengthened. I had already reached the limit to overcome it. In other words, in the current state of dyeing treatment of ultrafine fibers that are used in consideration of material flexibility, touch, and appearance quality with a sense of quality, there are few dyes that clear the strict level required by users. However, it has a problem that it cannot be used due to problems such as carcinogenicity, and the color tone is limited, so that only a material having a light color tone can be obtained.

In addition, in order to improve the light fastness, it has been attempted to combine the dyes of the so-called three primary colors of red, blue and yellow, which have the most effect on the light fastness at the current level, to color the ultrafine fibers. It has been done. However, the result was that the discoloration and fading was unexpectedly larger than expected, and even when the combination of dyes having poor light fastness produced a better result. However,
The lightfastness in such a situation is far inferior to the target, and a definitive solution has not been found yet.

On the other hand, it is possible to obtain, with respect to the ultrafine fibers colored by mixing and adding a pigment in the polymer instead of dye coloring, those having relatively good light resistance performance can be obtained. However, it is difficult to prepare a wide variety of color tones due to problems such as manufacturing equipment.However, even if pigments are mixed in, there is a limit in the color developability and the range of possible color tones. When the pigment of No. 1 is mixed in, various problems such as clogging of the filter during spinning and abnormal increase of filtration pressure and difficulty of spinning itself, or insufficient satisfactory strength of the fiber obtained by such spinning may occur. I was holding.

[0006] Further, as the most effective method for industrially obtaining ultrafine fibers, a method of removing or exfoliating one component of the finely divided composite fibers is known, but such a method is generally used. In the thinning process, since an organic solvent is used, a part of the pigment is dissolved in the solvent, which causes a problem that a color change occurs in the ultrafine fiber or the color becomes pale. For this reason, a special means such as coating the outermost surface with another polymer has been dealt with as disclosed in Japanese Patent Publication No. 62-37152. However, in this case, there is a problem in that a special device is required, and further, there is a problem of lightening due to the polymer in the outermost layer, which is not sufficient.

From the above, it has been found that under the present circumstances, it is not possible to easily find an ultrafine fiber having both sufficient color-forming property and light resistance.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to provide an ultrafine fiber having improved color development and excellent light resistance, and a method for producing the same.

[0009]

The present inventors finally arrived at the present invention as a result of earnest research for solving these problems.

That is, the present invention is characterized in that ultrafine fibers of 1.0 denier or less made of a polymer pigmented red and / or blue are colored with a dye different from the color tone of the ultrafine fibers. According to another aspect of the present invention, a finely colored fiber having a red and / or blue pigmented polymer as a residual component and a water-soluble polymer as a removal component is used. After the composite fiber is thinned with an aqueous solvent, the remaining ultrafine fibers having a denier of 1.0 denier or less are colored with a dye having a different color tone, and a method for producing ultrafine fibers excellent in color development and light resistance. It is about.

[0011]

The present invention will be described in detail below.

There are roughly two methods for producing ultrafine fibers having a denier of 1.0 or less in the present invention. One of them is a method of directly obtaining ultrafine fibers, and the other is a method of using a thinnable conjugate fiber. In the former method, it is not necessary to carry out the thinning treatment in the post-processing in order to carry out the ultrathinning at the spinning stage. Therefore, it becomes possible to prevent the elution of the pigment contained in the fiber due to the use of the organic solvent, which has been taken up as a problem of the conventional technique. However, the ultrafine fibers of 0.3 denier or less, which are most preferably used in the present invention, have a major drawback that they cannot be easily processed freely due to problems in the apparatus. Therefore, in the present invention, the latter composite fiber is used to achieve ultrafine size. The micronized conjugate fiber used in the present invention refers to an ultrafine fiber-generating composite fiber such that a removal component is discharged to obtain an ultrafine fiber, more specifically, a sea-island type composite fiber, a mixed spun composite fiber, a separation splitting type. It refers to a multicomponent composite fiber such as a composite fiber or a composite fiber that forms various deformed cross sections.

As the polymer constituting the residual component of the present invention, it is desirable to use a polymer which has a fiber-forming property and is insoluble in water. For example, polyamides such as nylon 4, nylon 6, nylon 7, nylon 11, nylon 12, nylon 66 and nylon 610, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyolefins such as polyethylene, polypropylene and polybutylene, and these Examples thereof include copolymers and modified products. Among them, polyethylene terephthalate and polybutylene terephthalate are preferable from the viewpoint of physical properties and practical performance of the obtained product.

In the present invention, the red and blue colorants added in advance to the ultrafine fiber constituent polymer include inorganic pigments such as chrome red, molybdenum red and Prussian blue, phthalocyanine type, anthraquinone type, thioindigo type and azo type pigments. The organic pigments commonly used for polymer deposition can be used. Among them, the inorganic pigments are preferably used because they have better light resistance. During spinning, it is possible to directly use a mixture of the colorant in an amount of 0.1 to 7.0% based on the weight of the polymer. If the amount of the colorant added is less than 0.1%, it is not possible to obtain fibers having a sufficient color tone, and the amount is 7.0%.
If it exceeds, the fiber strength will be lowered. However,
There is no problem even if the colored chips are used as a mixture with a usual polymer.

When spinning using the above-mentioned chips, it is desirable to mix and stir as much as possible until discharge in order to prevent secondary aggregation of the pigment on the way, and therefore it is preferable to use an extruder type spinning machine. .. However, it goes without saying that spinning can be performed using a pressure melter type spinning machine by sufficiently controlling and mixing pigments in advance.

The water-soluble polymer constituting the removing component of the present invention is preferably one having fiber-forming properties and having a property of being easily soluble in hot water of 80 ° C. or higher or weak alkaline hot water. Specific examples thereof include a copolyester, a copolyamide, a polyvinyl alcohol-polyethylene copolymer, and a more preferable example is a copolyester, the main acid component of which is terephthalic acid. 8-15 mol% is 5-
Sodium sulfoisophthalic acid, 5 to 40 mol% of which is composed of isophthalic acid is preferable.

The comminuted conjugate fiber of the present invention is comminuted with the above aqueous solvent. Considering the development of car seat materials that require improved color development and light resistance, as well as texture, touch, and appearance quality with a sense of quality, the denier of ultrafine fibers obtained after thinning treatment Is preferably less than 0.7, more preferably 0.3 or less.

In the present invention, the pigmented ultrafine fibers thus obtained are colored with a dye. In dyeing, the point is to use a dye having a color tone different from that of the pigment.
The dye can be selected from commonly used dyes, but it is particularly preferable to use a dye having good light resistance.

The feature of the present invention is that the deterioration of light resistance and discoloration in the conventional combination of only dyes having good light fastness are extremely reduced, and the combination of a pigment added in advance and a pigment having good light fastness is aimed at. The good light resistance and discoloration resistance can be improved.

Further, in a preferred embodiment of the present invention,
The use of two types of pigments, red and blue, at the same time.
By dyeing such a material with an arbitrary dye, preferably a yellow dye, a color assort having good light resistance over a wide range is possible.

[0021]

EXAMPLES Examples will be shown below, but the effectiveness of the present invention is not limited or restricted by these, but rather brings about the following application development.

The light resistance evaluation of the present invention is based on a fade meter of 83 ° C. for 200 hours.

Example 1 Polyester (A) obtained by copolymerizing phthalic acid and 5-sodium sulfoisophthalic acid as a sea component, and an inorganic red pigment of about 5% by weight as an island component (ATAN manufactured by Hoechst Japan).
4004) as a kneaded polyester (B), which is spun and stretched using a sea-island type composite spinneret (16 islands and 18 holes), and has a component ratio (B / A) of 60/40% by weight. Fiber was obtained.

Then, the fiber is passed through a crimper and crimped at about 10 threads / inch, and cut into 51 mm,
I got raw cotton.

This raw cotton was applied to a card cloth wrapper to form a web having a basis weight of 282 g / m ² . Next, strong twist fabric (50D-36F for both vertical and horizontal, number of twist 270)
The web was laminated at 0 T / m), and the web and the fabric were integrated by needle punching. The obtained punch felts were laminated so that the woven fabric side was on the outside, and further needle punched to obtain a high-density sheet.

Next, the sheet was heat-shrinked, and then sufficiently washed with a 3% aqueous sodium hydroxide solution at 90 ° C. The treated sheet was impregnated with a 12% DMF-based polyurethane solution and wet-coagulated. After drying, the sheet was cut into half and the sliced surface was raised using a buffing device.

Then, the obtained napped sheet was made with Samaron Blue FBL (Hoechst product name) 1.0 to fiber weight% and Samaron Yellow Brown HRSL-TN (Hoechst product name) 0.4 to fiber weight%. It was dyed at 120 ° C. for 45 minutes and washed with water.

The product thus obtained has a basis weight of 250 g /
It was a suede-like napped sheet with m ² and an apparent density of 0.27 g / cm ³ . This product was extremely excellent in color development, had an excellent nap property and surface quality, and had good light resistance as shown in Table 1.

Comparative Example 1 [0029] The ponoethylene terephthalate constituting the island component of Example 1 was not mixed with a pigment, and the processes up to the napped sheet were all carried out in the same manner as in Example 1, and then, TeraSeal Red R
(Ciba Geigy product name) 5.0 to fiber weight%, and blue and yellow dyes (both use the same dyes as in Example 1) at 1.0 to fiber weight% and 0.4 to fiber weight% of 120, respectively.
It was dyed at 45 ° C for 45 minutes and washed with water.

The napped sheet thus obtained was similar to Example 1 in color development and appearance quality, but was inferior in light resistance as shown in Table 1.

Comparative Example 2 Polyethylene terephthalate, which constitutes the island component of Example 1, was mixed with about 2% of a pigment manufactured by Hoechst Japan Co., which is composed of Renol Red and Renol Blue. Hereinafter, all processes up to the napped sheet were carried out. The same procedure as in No. 1 was performed (note that the disperse dye treatment thereafter was not performed). The napped sheet obtained was excellent in light resistance, but lacked in color saturation and depth in terms of appearance quality and color development.
As shown in (1), it was inferior to that of Example 1.

[0032]

[Table 1]

[0033]

EFFECTS OF THE INVENTION The ultrafine fibers of the present invention (1) can be finely processed without the use of an organic solvent in the processing process, so that the loss of the pigment contained in the ultrafine fibers can be prevented.

(2) Since the ultrafine fibers are colored with a dye and a pigment, they have deep color development and excellent light resistance.

Therefore, the sheet-like material obtained by using the ultrafine fibers of the present invention is very preferably used in various fields where color development and light resistance are required, such as furniture and interior materials for automobiles.

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Claims (2)

[Claims] 1. A coloring property, characterized in that ultrafine fibers having a denier of 1.0 denier or less and made of a polymer pigmented red and / or blue are colored with a dye different from the color tone of the ultrafine fibers. Extra fine fibers with excellent light resistance. 2. A composite fiber comprising a red-colored and / or blue-pigmented polymer as a core component and a water-soluble polymer as an intervening component is treated with an aqueous solvent to leave 1.0
A method for producing an ultrafine fiber having excellent color development and light resistance, which comprises coloring an ultrafine fiber having a denier or less with a dye having a different color tone.