JPH04185714A - Spun-dyed polyester conjugate fiber - Google Patents

Abstract

PURPOSE:To obtain the subject conjugate fiber, having a core part composed of a spun-dyed polyester colored with a color pigment and a sheath part composed of a non-spun-dyed polyester, containing a prescribed amount of an ultraviolet light absorber, excellent in color fastness to light and useful as vehicular interior trims, etc. CONSTITUTION:The objective conjugate fiber which is core-sheath type polyester conjugate fiber having a core part that is a spun-dyed polyester such as polyethylene terephthalate, colored with a color pigment such as an azo lake-based pigment other than white color and containing a light stabilizer such as a hindered amine-based light stabilizer in an amount of preferably 0.1-2.0wt.% and a sheath part composed of a non-spun-dyed polyester. An ultraviolet light absorber such as a benzotriazole-based ultraviolet light absorber in an amount of 0.1-3.0wt.%, preferably 0.2-2.0wt.% is contained in the aforementioned sheath part. Furthermore, the core-sheath conjugate weight ratio is preferably (80/20) to (60/40).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a polyester spun-dyed composite fiber having high light fastness, and more specifically, to provide a fabric suitable for specifications for vehicle interior applications. This invention relates to polyester spun-dyed conjugate fibers that can be used.

[Prior Art] In general, fabrics for vehicle interiors are required to have high functionality as durable consumer goods. Among these, light fastness is one of the most important characteristics required for fabrics for vehicle interiors.
Since decolorization and discoloration caused by light significantly deteriorate the quality of the product, the I&H used must have strict light fastness. That is, it is usually necessary to maintain grade 3 or higher on the gray scale after 300 to 400 hours of exposure using a fade meter or sunshine weather meter.

Methods of improving the light fastness of polyester IN include selecting dyes that have strong resistance to photochemical reactions, and adding ultraviolet absorbers or light stabilizers during the dyeing process. It is common practice to prevent chemical changes in

It is also known that light fastness can be improved by the so-called dope-dyed method in which pigments are used instead of dyes and added before fiber formation, and dope-dyed yarns have already been produced by various methods. .

[Problems to be Solved by the Invention] When trying to obtain a polyester material suitable for vehicle interior use by these methods, conventional methods cannot use dyes and pigments with low light resistance, and However, even when adding ultraviolet absorbers or light stabilizers during the dyeing process, a uniform adsorption effect can be achieved regardless of yarn dyeing or anti-dying. Due to reasons such as the fact that it is extremely difficult to achieve this goal, it has not been possible to fully satisfy the functionality for use in vehicle interiors.

[Means for Solving Problems 11] The inventors of the present invention have conducted intensive studies to solve these problems, and surprisingly, they have developed a pigment-based polyester core with good light fastness. By placing polyester containing an ultraviolet absorber in the sheath part to protect the core part, polyester IIM has an extremely high light fastness that cannot be obtained with conventional methods.
The present invention was achieved by discovering that 1/lI can be obtained.

That is, the present invention provides a core-sheath type polyester composite IIN in which the core part is made of a doped polyester colored with a colored pigment other than white, and the sheath part is made of a non-doped polyester, and the sheath part is coated with a UV absorber. This is a polyester sporo-dyed composite IN characterized by the presence of a specific amount of .

The polyester used in the present invention has polyalkylene terephthalate as a main component, and polyethylene terephthalate and polybutylene terephthalate are particularly preferred. Furthermore, the spun-dyed polyester used for the core is one in which a colored pigment is added and dispersed in the above polyester, and the pigments include conventionally known azo lake type, benzimidazolone type, diasolide type, condensed azo type, quinacridone type, Dioxazine type, isoindolinone type.

Organic pigments such as bat-based and phthalocyanine-based pigments, and inorganic pigments such as titanium yellow, iron 11ide, cobalt blue, chromium oxide, cadmium sulfide, and carbon black can be used.
Any other known dyes or mixtures thereof that can generally be used for coloring polyester can be used. Among these, the use of organic pigments is particularly desirable because the effects of the present invention are large. It is desirable to add a light stabilizer to the core because it further improves the light fastness, which is the objective of the present invention. For example, it is preferable to add a light stabilizer to the core. Can be used. In particular, 1°2.3.4-tetra(
Hindered piperidine compounds such as 4-carbonyloxy-2,2°6,6-tetramethylbiveridine) are preferably used.

If the amount of such a light stabilizer is too small, the effect will not be exhibited, whereas if it is too large, the effect of improving light fastness will not only be saturated, but also cause a decrease in the physical properties of the fiber itself. , 0.1 to 2 based on the weight of the core polyester
．． A range of 0% by weight is desirable.

Next, as the ultraviolet absorber used in the sheath, conventionally known salicylate-based, benzophenone-based, benzotriazole-based, benzoate-based, oxalic acid anilide derivatives, @-converted acrylonitrile-based, etc. can be used, but among them, 2-
Benzotriazole-based compounds such as (2'-hydroxy-3', 5'-di-t-butyl-phenyl)-5-riOlopenzotriazole are preferred.

The amount of the ultraviolet absorber blended is preferably 0.1 to 3.0%, particularly 0.2 to 2.0%, based on the weight of the polyester sheath. If the amount added is less than 0.1%, the effect of improving light fastness will hardly be realized, while if it is more than 3.0%, not only will the light fastness not be further improved, but the physical properties of the polyester T&H itself will deteriorate. It is not desirable because it invites people.

The core/sheath composite ratio of the composite fiber of the present invention is 90/10 to 5015
0, preferably 80/20 to 60/40 (core/sheath: weight ratio). When this composite ratio exceeds 90/10, the thickness of the sheath becomes thin and the effect of improving light fastness becomes small. On the other hand, if So/ is less than 50, the amount of uncolored sheath components increases, making it impossible to obtain a sufficient coloring density, and it is often unsuitable for use in vehicle interiors.

The polyester composite fiber of the present invention can be produced using a conventionally known composite spinning device, using the above-mentioned ultraviolet absorber-containing polyester in the sheath and spun-dyed polyester in the core, under arbitrary spinning conditions. It can be manufactured without any problems. For example, a method of melt spinning at a speed of 500 to 250,077 L/min, stretching, and heat treatment, 1,500 to 5,000 m
Any spinning conditions can be employed, such as melt spinning at a speed of 1/2 min and drawing and false twisting simultaneously or successively.

[Effects of the Invention] The spun-dyed conjugate fiber of the present invention has the following advantages:1. Since it is concentrated in the sheath, it dramatically improves the light fastness of the spun-dyed polyester present in the core. Also, this effect
Further improvement can be achieved by using a light stabilizer in the core.

Therefore, it can be extremely usefully used in fields where light fastness of 8.8 is required, particularly for vehicle interior applications.

[Example] The present invention will be explained in more detail below using examples.

Examples 1 to 5 Comparative Examples 1 to 3 A blue master chip containing about 10% phthalocyanine blue pigment in polyethylene terephthalate with an intrinsic viscosity of 0.65 as a core component, and a light stabilizer in polyethylene terephthalate with an intrinsic viscosity of 0.65. 1, 2, 3.4
- A master chip containing 3% of -tetra(4-carbonyloxy-2,2,6,6-tetramethylbiveridine)-butane (manufactured by Adeka Argus Chemical ■, trade name rMARK-LA571) and an intrinsic viscosity fi O, A mixture of polyethylene terephthalate No. 65 with a light stabilizer content as shown in Table 1 (however, the pigment concentration is 1%) was used, while polyethylene terephthalate with an intrinsic viscosity of 0.65 was used as a sheath component. UV absorber 2-(2'-
A master chip containing 3% of hydroxy-3',5'-di-t-butyl-phenyl)-5-chlorobenzotriazole (manufactured by Nippon Ciba Geigy, trade name: rT1nuvin 327J) and the above-mentioned ordinary polyethylene terephthalate were combined. Using a mixture of ultraviolet absorbers whose contents were as shown in Table 1, concentric core-sheath type composite spinning was performed using a conventional method with a core-sheath ratio of 7:3, and the spinning temperature was 290 degrees. An undrawn yarn of 225 denier/36 filaments was obtained at a take-off speed of 1000 m/min. These were further stretched 3 times while heat setting, and 7
It was made into a drawn yarn of 5 denier/36 filaments.

Each of the obtained drawn yarns was made into a tubular knitted fabric, and irradiated with light at a fade meter of 83° C., and its discoloration and fading was measured using a gray scale, and the irradiation time until it became lower than grade 3 was determined. The results are shown in Table 1.

For comparison, a yarn of 75 denier/36 filaments was obtained by spinning and drawing a yarn in which the same light stabilizer and ultraviolet absorber as above were uniformly blended with the pigment in the direction of the m-separation plane instead of in the core-sheath structure. Ta. When this drawn yarn was evaluated in the same manner as above, it was found that the degree of discoloration and fading was large. These data are also summarized in Table 1.

Table 1 * Fade meter irradiation time (hr) for gray scale below grade 3 A-1: Tinu manufactured by Ciba Geigy Japan
vtn 327B-1: MA manufactured by Adeka Argus Chemical ■
RK-LA57 Examples 6 to 13 The same procedure as Example 2 was carried out except that the type of UV absorber and light stabilizer used in Example 2 or 4 were changed to those listed in Table 2. 75 denier, ・23
A drawn yarn of 6 filaments was obtained.

The light fastness of these drawn yarns was measured using the same tube-knitted fabrics. The results are shown in Table 2.

Table 2 *No x-i' where the gray scale is less than grade 3, meter irradiation time (hr) △-4: Viosorb 550
(Kyodo Pharmaceutical ■) C-1 Nephthalocyanine Green C-2: Sogo Azo Red C-3: Anthraquinone Yellow [-1- C-4: Molybdenum Red

Claims (2)

[Claims] (1) A core-sheath type polyester composite fiber in which the core part is made of a doped polyester colored with a colored pigment other than white, and the sheath part is made of a non-doped polyester, and the sheath part has no ultraviolet absorber. .1 to 3.0% by weight of polyester spun-dyed composite fiber. (2) The polyester spun-dyed conjugate fiber according to claim (1), wherein the core contains 0.1 to 2.0% by weight of a light stabilizer.