JPS63165517A - Fluorescent polyester fiber - Google Patents

Abstract

PURPOSE:To obtain the titled fiber for decoration, etc., consisting of a composition prepared by containing a perylene based fluorescent dye in a polyalkylene terephthalate based polyester and having high fluorescent intensity as well as excellent feeling and producible with good fiber productivity. CONSTITUTION:The aimed fiber obtained by spinning a composition prepared by containing >=0.001wt%, preferably >=0.005wt% perylene based fluorescent dye in a polyalkylene terephthalate, e.g. polyethylene terephthalate, or a polyester consisting essentially thereof. The above-mentioned fiber is preferably used as a decorative fabric such as moquette in which cross section of the fiber is exposed to the surface thereof.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is directed to a fluorescent dye containing a fluorescent dye that captures ambient light, that is, direct light and indirect light from a light source, and converts it into fluorescent light. This invention relates to photosensitive polyester fibers.

(Prior art) Conventionally, fluorescent fibers were cotton and string1! ! Since it can be made into various forms such as II cloth, it is expected to be applied to decorative purposes. For example, Japanese Patent Application Laid-Open No. 60-81315 proposes one containing an inorganic fluorescent agent.

In addition, attempts have been made to improve the efficiency of solar cells by concentrating sunlight using synthetic resin sheets containing fluorescent pigments and converting it to a specific wavelength.

For example, JP-A-57-21453 and JP-A-57-2
Publication No. 3653 discloses a polyalkylene terephthalate containing an anthraquinone-based, perinone-based, or thioindigo-based fluorescent pigment.

(Problems to be Solved by the Invention) Conventional fluorescent agents do not have sufficient fluorescence, and it has been difficult to obtain fibers with sufficient fluorescence as light-concentrating fibers or decorative fibers.

Further, when producing a fluorescent fiber using a fluorescent pigment as a fluorescent agent, the fluorescent pigment is contained in an amount that will provide a fiber that is satisfactory as a fluorescent fiber.

Generally, spinnability decreases and operability deteriorates. That is,
Part of the pigment may accumulate in the filter medium, increasing the filtration pressure, or coarse pigment particles may remain in the fibers, causing thread breakage. Furthermore, there was a problem in that the fluorescent pigment exposed on the back surface of the INN made the texture of the fibers hard.

The present invention aims to provide a fluorescent polyester fiber that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the present inventors have made extensive studies and found that it is effective to form fibers from polyester containing a specific fluorescent dye. This discovery led to the present invention.

That is, the gist of the present invention is a fluorescent polyester fiber made of a composition containing 0.001% by weight or more of perylene fluorescent dye in polyalkylene terephthalate or a polyester mainly composed of polyalkylene terephthalate. .

As the polyester in the present invention, a substantially transparent polyester, that is, one having a parallel light transmittance of 70% or more and a haze value of 5 or less as measured according to JIS K 7105 is preferably used.

The perylene fluorescent dye in the present invention includes:

JP-A-57-125260, JP-A No. 58-40359
Examples include compounds such as those disclosed in Japanese Patent Publication No. 60-203650, two or more of which may be used in combination;
Fluorescent dyes other than perylene-based dyes may be used in combination.

Perylene-based fluorescent dyes are used in polyester fibers.

It is necessary to contain 0.001% by weight or more, preferably 0.005% by weight or more. If this content is less than 0.001% by weight, the fluorescence of the fiber will be insufficient.

The fiber of the present invention can be obtained by spinning the polyester during synthesis or by adding a perylene fluorescent dye to the polyester. The method of adding the perylene fluorescent dye is not particularly limited, and when adding it to polyester, a triblend method, a master bunch method, etc. can be adopted.

Furthermore, the fiber of the present invention contains 0.00% perylene fluorescent dye.
In addition to fibers spun solely from a polyester composition containing 1% by weight or more, composite fibers spun from this composition and other components may also be used.

The cross-sectional shape of the fiber is usually 9 circular, but it may also have a modified cross-section such as hollow, trilobal, hexalobal, etc.

Note that the fiber of the present invention may contain additives such as a fluorescent whitening agent, a lubricant, a heat stabilizer, an antioxidant, and an antistatic agent, within a range that does not impair its effects.

The fibers of the present invention are useful as woven or knitted fabrics with unique hues. The fiber of the present invention converts the absorbed light energy into light with a longer wavelength and emits it. However, most of the emitted light is concentrated in the center of the fiber due to total internal reflection, so A strong light can also be seen in the cross section. Therefore, when the fibers of the present invention are used as decorative fabrics, it is desirable that the cross-section of the fibers be exposed on the surface of the fabric, such as a moquette.

Furthermore, the fiber of the present invention can also be used as a light-concentrating material for fluorescent solar collectors and the like.

Sheets because when the fibers are lined up, unevenness occurs on the surface.

Compared to films, etc., it can have a larger absorption area per unit area, resulting in higher performance.

(Example) Next, the present invention will be specifically explained with reference to Examples.

In addition, the intrinsic viscosity is a value measured at 20'C using an equal weight mixture of phenol and tetrachloroethane as a solvent,
Parallel light transmittance and haze value are values measured with a plate thickness of 3 fins and 4 ml according to the JIS K 7105 method.

In addition, the fluorescence intensity of the fibers was observed with the naked eye.

Evaluation was made in three stages: O: strong, △: medium, and ×: weak.

Examples 1 to 6 and Comparative Examples 1 to 3 Intrinsic viscosity 0.78. A polyethylene terephthalate chip with a parallel light transmittance of 99% and a value of 1% is tri-blended with the fluorescent dyes shown in Table 1 (the numbers in parentheses are the amount added, the unit is weight %) and extruder type. It was fed to a melt spinning machine and spun at a spinning temperature of 300°C from a spinneret with 120 spinning holes with a diameter of 0.61 M at the discharge rate shown in Table 1, and at the spinning speed shown in Table 1. The drawn thread was wound up.

Next, this undrawn yarn was drawn at the draw ratio shown in Table 1 to obtain drawn yarn having the single yarn fineness (denier) shown in Table 1.

The spinnability was good in all cases, and the texture of the drawn yarns obtained was good in all cases.

Table 1 shows the fluorescence intensity of the drawn yarn obtained.

In Table 1, the fluorescent dyes are all perylene fluorescent dyes manufactured by BASF Corporation, and the abbreviations are as follows.

FO: Fluorescence Orange
240F R: Fluorescence RE
D KF856 Table 1 Example 7 In Example 1, the spinneret was equipped with one spinning hole with a diameter of 31 mm.
I changed it to my own one and the discharge amount was 14g/min.

The spinning speed of the undrawn yarn was set to 70 m/min, and the drawing ratio was set to 4.5 times to obtain a drawn monofilament of 400 denier.

The spinnability was good, and the drawn monofilament obtained had a smooth surface and a fluorescence intensity of ○.

Example 8 Using equal weights of the polyethylene terephthalate composition blended with the fluorescent dye in Example 1 and polyethylene terephthalate containing no fluorescent dye, a concentric core-sheath type conjugate fiber having the former as the core component was produced. At that time, spinning temperature 3
At 00°C, spinning was carried out at a flow rate of 460 g/min from a spinneret having 265 spinning holes with a diameter of 0.5 mm, and the spinning speed was 6.
A drawn yarn with a single yarn fineness of 6 denier was obtained at 00 m/min and a stretching ratio of 4.0 times.

The spinnability was good, and the fluorescence intensity of the obtained drawn yarn was ○.

For the fibers obtained in each of the above Examples, the fluorescence spectra of the cross section of the fibers were determined using a spectrofluorometer 650-10S manufactured by Hitachi, Ltd., and the fluorescence spectra of the fibers of Examples 1 to 3 and 7 to 8 were around 580 nm. The fibers of Examples 4 to 6 exhibited strong orange fluorescence with a peak at 610
It exhibited strong red fluorescence with a peak around nm.

Furthermore, when the fibers of Examples 1 and 4 were used for weaving, woven fabrics with a unique hue were obtained.

Reference Example 1 A drawn polyester yarn was obtained in the same manner as in Example 1 except that 0.02 weight 1% of a fluorescent brightener Uvitex MB2 manufactured by Ciba Geigy was used in place of the fluorescent dye in Example 1.

The fluorescence intensity of the obtained drawn yarn was x.

Reference Example 2 Polyester was stretched in the same manner as in Example 1, except that 3% by weight of zinc sulfide (containing copper as an activator) with an average particle size of 12 μm was used as a fluorescent agent instead of the fluorescent dye in Example 1. Got the thread.

During spinning, yarn breakage occurred frequently, and the resulting drawn yarn.

The fluorescence intensity was low and the texture was rough and hard.

(Effects of the Invention) According to the present invention, a fluorescent polyester fiber is provided which has a high fluorescence intensity, has a good texture, and can be easily produced.

Claims (1)

[Claims] (1) Add 0.0% perylene fluorescent dye to polyalkylene terephthalate or polyester mainly composed of polyalkylene terephthalate.
A fluorescent polyester fiber comprising a composition containing 0.01% by weight or more.