JP2835800B2 - Core-sheath composite dyed fiber having fluorescent color and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core-sheath type composite fiber which emits fluorescent light and has high decorativeness used for narrow tapes such as shoelaces and ski stock bands, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, fibers having fluorescent coloring properties are expected to be developed for decorative applications, and various production methods have been proposed. For example, JP-A-49-91579 discloses that
A thermoplastic monofilament containing a fluorescent agent is disclosed. However, according to this method, spinnability and drawability are poor, and only monofilament-like thick fibers can be obtained. JP-A-60-81315 and JP-A-60-199942 disclose a core-sheath fluorescent composite fiber comprising a component containing a fluorescent agent and a component not containing a fluorescent agent. .

[0003]

However, in the above method, the dispersibility of the fluorescent pigment is not uniform, and the fluorescent property cannot be sufficiently exhibited. In particular, for polypropylene fibers,
It was difficult to obtain fibers having poor fluorescence compatibility with pigments due to poor compatibility with the pigment.

[0004]

Means for Solving the Problems The present inventors have made intensive studies in view of the above problems, and as a result, colored a nylon polymer having good compatibility with a fluorescent dye, blended with a polypropylene polymer to form a core component, and By using a polypropylene polymer as a sheath component, it has been found that a fiber having uniformity of dispersibility of a fluorescent pigment can be obtained while taking advantage of characteristics such as non-water absorbency of polypropylene, and reached the present invention.

[0005] That is, the present invention provides a core-sheath type composite fiber having a fluorescent color, characterized in that a polypropylene polymer blended with a nylon polymer containing a fluorescent dye is disposed on a core and a polypropylene polymer is disposed on a sheath. It is the gist.

The nylon polymers used in the present invention include nylon 6, nylon 6/6, nylon 4/6,
Nylon 6/10. The reason why the nylon polymer is colored in the form of pellets (hereinafter referred to as “dyeing”) is that, by using a nylon polymer having a good compatibility with the fluorescent dye, the dispersibility of the fluorescent pigment becomes uniform and the fiber having a good fluorescent coloring property is obtained. This is because That is,
Use of a polyolefin-based polymer as a core component as described in JP-A-81-31515 and JP-A-60-199942 has poor compatibility with a fluorescent agent,
The dispersibility of the fluorescent pigment becomes non-uniform, and the fluorescent coloring property deteriorates.

The core component used in the present invention was obtained by blending native nylon with polypropylene. Original nylon / polypropylene ratio is 5/95 (weight ratio)-
Up to 20/80 (weight ratio), the color is changed by the fluorescent color to adjust the coloring.

[0008] If the fiber core / sheath ratio (core / sheath) is large, the fluorescent coloring property is improved, but if the sheath component does not cover the entire fiber, the stability of the spinning and drawing steps deteriorates. Therefore, in the present invention, the core-sheath ratio is preferably 3 or less.

The fiber of the present invention is produced by melt-composite spinning, in which a polypropylene polymer containing a fluorescent-stained nylon polymer is disposed on a core portion and a polypropylene polymer is disposed on a sheath portion. From the viewpoint, the melt index (hereinafter abbreviated as MI) of each polymer is 20 to 5
It is preferably in the range of 0 g / 10 min (measured at 230 ° C.), and the MI is less than 20 g / 10 min and 50 g / min.
In a range exceeding 10 minutes (measured at 230 ° C.), yarn breakage frequently occurs during spinning. The melt index is J
It is a value measured according to IS K7210.

The drawing of the fiber of the present invention after the composite spinning is preferably performed at a magnification of 3 to 6 times. If the draw ratio is less than 3, the strength of the produced fiber will be low, and if it exceeds 6, the dispersion of the fluorescent agent will not be uniform, thereby deteriorating the color developability or whitening the polypropylene in the sheath portion, and coloring. Make it worse.

In the present invention, the larger the diameter of the fiber is, the better the color developability is. However, considering the processability, the single fiber denier is preferably 20 denier or less.

[0012]

The present invention will be specifically described below with reference to examples. Example 1 A nylon pellet containing 4% of a fluorescent dye was kneaded with polypropylene pellets in an amount of 5 to 20% by weight, and had a MI of 30 g / 10 min (230 ° C.).
Measurement) (made by Dainichi Seika Co., Ltd.) as a core component, polypropylene having a MI of 30 g / 10 min (measured at 230 ° C.) as a sheath component, and a core extruder temperature of 190
200 ° C., sheath extruder temperature 230 ° C., core / sheath ratio 1
Then, a 680 denier / 60 filament core-sheath composite fiber was spun. Further, this fiber was stretched at a stretching ratio of 4.247 to obtain a core-sheath type composite fiber having good fluorescent coloring property.
This fiber was a fiber having no fluorescence dropping at the time of drawing, and having good fluorescence coloring property.

Example 2 A pellet prepared by kneading 5 to 20% by weight of nylon pellets containing 4% of a fluorescent dye into polypropylene pellets and having an MI of 30 g / 10 mi
n (measured at 230 ° C) [Dainichi Seika Co., Ltd.]
With a core component of 30 g / 10 min (230 ° C.)
Extrusion 2)
00 to 220 ° C and sheath extruder temperature 210 to 230
A core-in-sheath composite fiber of 270 denier / 30 filaments was spun at a temperature of 1.degree. Further, this fiber was drawn at a draw ratio of 4 to obtain a core-sheath composite fiber having good fluorescent coloring property. This fiber was a fiber having no fluorescence dropping at the time of drawing, and having good fluorescence coloring property.

Example 3 Spinning and stretching were carried out under the same conditions as in Example 2 except that the core-sheath ratio was set to 2, to obtain a core-sheath type conjugate fiber having good fluorescent coloring properties. This fiber was a fiber having no fluorescence dropping at the time of drawing, and having good fluorescence coloring property.

Example 4 Spinning and stretching were carried out under the same conditions as in Example 2 except that the core-sheath ratio was set to 3, to obtain a core-sheath conjugate fiber having excellent fluorescent coloring properties. This fiber was a fiber having no fluorescence dropping at the time of drawing, and having good fluorescence coloring property.

Example 5 The undrawn yarn obtained in Example 1 was
Using a simultaneous stretching air processing machine, stretch ratio 3.88, hot air 17
Stretching was performed at 3 ° C. to obtain a core-sheath composite processed yarn having good fluorescent coloring properties. This processed yarn was a processed yarn having no fluorescence dropping and excellent fluorescence coloring.

Comparative Example 1 Nylon pellets containing 4% of a fluorescent dye were kneaded with polypropylene pellets in an amount of 5 to 20% by weight, and had a MI of 30 g / 10 mi.
n (measured at 230 ° C) [Dainichi Seika Co., Ltd.]
340 denier / 30 at an extruder temperature of 195 to 210 ° C.
A single yarn of the filament was spun. Further, when this fiber was stretched at a stretching ratio of 3.23, the dye was dropped off and the stability was poor.

Comparative Example 2 Spinning and stretching were performed under the same conditions as in Example 2 except that the core-sheath ratio was set to 4, to obtain a core-sheath type composite fiber having good fluorescent coloring properties. In this fiber, the pigment fell off during stretching, and the stability of the cross-sectional shape in which a part of the core was exposed on the fiber surface was poor.

[0018]

As described above, the fiber of the present invention has an effective characteristic as a polypropylene fiber, has a good fluorescent coloring property, which was impossible with a conventional polypropylene fiber, and has a color corresponding to the fashionability in recent years. Fiber.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-112414 (JP, A) JP-A-59-189876 (JP, U) JP-B-43-4539 (JP, B1) (58) Investigation Field (Int.Cl. ⁶ , DB name) D01F 8/04-8/16 D01F 1/00-1/10 D01F 6/46

Claims (5)

(57) [Claims] 1. A core-sheath type composite fiber having a fluorescent color, wherein a polypropylene polymer blended with a nylon polymer containing a fluorescent dye is disposed on a core portion and a polypropylene polymer is disposed on a sheath portion. 2. The core-sheath composite dyed fiber having a fluorescent color according to claim 1, wherein the core-sheath ratio (core / sheath) is 3 or less. 3. A core-sheath type composite material having a fluorescent color, wherein a polypropylene polymer blended with a nylon polymer containing a fluorescent dye is disposed on a core portion and a polypropylene polymer is disposed on a sheath portion to perform melt composite spinning. A method for manufacturing the fiber. 4. The method for producing a core-sheath composite dyed fiber having a fluorescent color according to claim 3, wherein drawing is performed at a magnification of 3 to 6 times after the melt composite spinning. 5. The process for producing a core-sheath composite dyed fiber having a fluorescent color according to claim 3, wherein after the melt composite spinning, simultaneous drawing air processing is performed at a draw ratio of 3 to 6 times.