JP2003213549A - Reversible thermally allochroic knitting string - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reversible thermally allochroic knitting string suitable for a handicraft yarn, clothes, a curtain, a dress for doll, etc., capable of continuously manifesting its thermal allochroic performance, and having a feeling same to a conventional knitting string. <P>SOLUTION: The reversible thermally allochroic knitting string is obtained by knitting synthetic fibers which have 0.1-30 wt.% of a reversible thermally allochroic pigment with 0.1-30 μm of average particle diameter adhered on the fibers in dispersed state, the synthetic fibers comprises multi filaments with 5-50 μm of thickness of mono-filament. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a reversible thermochromic braid. More specifically, the present invention relates to a reversible thermochromic braid having a reversible thermochromic function and a texture similar to that of a general-purpose braid.

[0002]

2. Description of the Related Art Conventionally, regarding reversible thermochromic yarns,
Although some proposals have been disclosed, no effective proposal has been disclosed yet for a braid that reversibly exhibits a color change upon temperature change.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to provide a reversible thermochromic braid which is excellent in flexibility and can exhibit a thermochromic function continuously even after repeated use.

[0004]

According to the present invention, a reversible thermochromic pigment having an average particle diameter of 0.1 to 30 μm is fixed in a dispersed state in a proportion of 0.1 to 30% by weight based on the fiber. The requirement is a reversible thermochromic braid characterized by knitting synthetic fibers. Furthermore, the synthetic fibers are required to be composed of multifilaments each having a single fiber thickness of 5 to 50 μm.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The reversible thermochromic braid according to the present invention is
Other than knitting the thermochromic synthetic fiber, it can be constituted by a conventionally known means.

The synthetic fiber has an average particle size of 0.1 to 30.
1 to 30% by weight of the reversible thermochromic pigment of μm is fixed in a dispersed state in the synthetic fiber, and the thickness of the single fiber is 5 to 50 μm.
A multifilament (preferably 10 to 30 μm) is mainly applied, but non-thermochromic fibers can be appropriately blended depending on the purpose.

The synthetic fiber is made of a fiber-forming resin which has been conventionally used, such as polyamide, polyester and polyolefin, and the reversible thermochromic pigment is
(A) Electron-donating color-developing organic compound, (b) electron-accepting compound, (c) reversible heat composed of a homogeneous compatible solution of the reaction medium that determines the temperature at which the color reaction of (a) and (b) occurs. Microcapsule-type pigments containing a color-changing composition are effective, and specific examples of the reversible thermochromic composition include JP-B-51-35414 and JP-B-51-44706.
JP-B, JP-B-51-44708, JP-B-52
-7764, Japanese Patent Publication No. 1-29398, Japanese Patent Laid-Open No. 186546/1995, and the like. The above-mentioned color changes before and after a predetermined temperature (color change point) as a boundary, and only one specific state can exist in the normal temperature region of both states before and after the change. That is, the other state is maintained while the heat or cold required to develop that state is applied, but returns to the state exhibited in the normal temperature range when the application of the heat or cold is lost, so-called, Small hysteresis width (ΔH) for temperature-color density curve due to temperature change
It is a type that shows and changes color. Further, Japanese Patent Publication No. 4-17154 proposed by the present applicant and Japanese Patent Laid-Open No. 7-17977.
No. 7, JP-A-7-33997, etc., a temperature-sensitive color-changing color memory composition exhibiting a large hysteresis characteristic, that is, a shape of a curve in which a change in color density due to temperature change is plotted. However, it is a type that changes the color by following a significantly different path when increasing the temperature from the lower temperature side than the color changing temperature range and when decreasing the temperature from the higher temperature side than the color changing temperature range. A reversible thermochromic composition having a characteristic of being able to store and retain a state of being changed at a temperature below the low-temperature side discoloring point or above the high-temperature side discoloring point in a room temperature range between the high-temperature side discoloring point is also effective.
In addition, as a heat-coloring composition, a specific compound having a linear or side chain alkyl group having 3 to 18 carbon atoms, which is an electron-accepting compound proposed by the present applicant and which develops color by heating from a decolored state, A system to which an alkoxyphenol compound is applied (JP-A-11-129623 and JP-A-11-5).
973) or a system to which a specific hydroxybenzoic acid ester is applied (JP 2001-105742 A). Further, a system to which gallic acid ester or the like is applied (Japanese Patent Publication No. 51-44706) can be applied.

A reversible thermochromic composition containing the above-mentioned three components of an electron-donating color-developing organic compound, an electron-accepting compound, and an organic compound medium that reversibly causes the color reaction of both of them is formed into a microcapsule. It is used as a pigment in the form of encapsulated microcapsules. This is because the reversible thermochromic composition can be kept in the same composition under various use conditions, and the same effect can be obtained. here,
Microencapsulation is performed by a conventionally known interfacial polymerization method, i
n Situ polymerization method, in-liquid curing coating method, phase separation method from aqueous solution, phase separation method from organic solvent, melt dispersion cooling method, air suspension coating method, spray drying method, etc. To be selected. Further, the surface of the microcapsules may be provided with a secondary resin film depending on the purpose to impart durability, or the surface characteristics may be modified for practical use. Incidentally, a constitution in which a coloring agent such as a non-thermochromic dye or pigment is mixed in the microcapsule or the fiber-forming resin to exhibit an alternating change from colored (1) to colored (2). It can be the one that

The above-described microcapsule reversible thermochromic pigment is blended in the target fiber-forming resin in an amount of 0.1 to 30% by weight (preferably 1 to 10% by weight), pelletized and melted. It is spun by a spinning device. If it is less than 0.1% by weight, it is difficult to obtain the desired color density in the color-developing state of the reversible thermochromic composition, and if it exceeds 30% by weight, the amount of microcapsule pigments becomes excessive and it does not melt in the fiber-forming resin. Since the spinnability is deteriorated due to the presence of a portion, melt spinning becomes difficult, and residual color may occur in the decolored state. Conventional light stabilizers such as UV absorbers, antioxidants, antiaging agents, singlet oxygen quenchers, ozone decolorizers, visible light absorbers, and infrared stabilizers are selected as light stabilizers. It may be appropriately blended, or various plasticizers, general pigments, fluorescent pigments, white pigments such as titanium dioxide, pearl pigments, colorants such as metal powders, and luminous pigments may be added.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The reversible thermochromic knitting cord of the present invention will be specifically described by the following examples, but the present invention is not limited to these examples. In addition, the compounding in an Example shows a weight part.

[0011]

【Example】

Example 1 5 parts of a reversible thermochromic microcapsule pigment having a diameter of 5 μm, which reversibly changes color to pink at 30 ° C. or below and colorless at 32 ° C. or above, 1 part of a dispersant, and 94 parts of 12 nylon resin. After melt-mixing with an extruder at 190 ° C to form thermochromic pellets, use a general-purpose melt-spinning device to obtain a thickness of 30
A reversible thermochromic multifilament consisting of 36 μm filaments was spun. The multifilament exhibited a reversible thermochromic property in which it showed a pink color at room temperature (30 ° C or lower) and disappeared and became colorless at about 32 ° C or higher. The multifilament was knitted with a 4-needle knitting machine to obtain a lily yarn (knitting string). The obtained knitting string sewn on a part of the doll's costume becomes a supple string-like decoration, which is pink at room temperature (30 ° C or lower) and is about 32
It showed reversible thermochromic property that disappeared and became colorless above ℃.

Example 2 Reversible thermochromic microcapsule pigment 5 having a diameter of 10 μm which reversibly changes color to blue at 30 ° C. or lower and colorless at 32 ° C. or higher 5
Part, general color pink pigment 1 part, dispersant 1 part, and polyhexamethylene terephthalate resin 93 parts are melt-mixed in an extruder to form thermochromic pellets, and then the thickness is measured using a general-purpose melt spinning device. A reversible thermochromic multifilament consisting of 30 35 μm single yarns was spun. The multifilament exhibited a reversible thermochromic property which exhibited a blue color at room temperature (30 ° C or lower) and a pink color at about 32 ° C or higher. The multifilament was processed into a lily yarn as in Example 1 and sewn on a part of the doll's costume,
It became a supple cord-like ornament, and exhibited reversible thermochromic properties that exhibited blue at room temperature (30 ° C or lower) and pink at about 32 ° C or higher.

Example 3 The thermochromic pellets obtained in Example 1 were fed to a core molding extruder and natural 12 nylon resin to a sheath molding extruder, respectively, and core / sheath = 7/3 (Weight ratio)
In the above, a reversible thermochromic multifilament consisting of 36 composite fibers having a thickness of 30 μm was spun by a general-purpose composite fiber spinning device. The above-mentioned multifilament processed into lily yarn (knitting cord) exhibits a reversible thermochromic property of exhibiting a pink color at room temperature (30 ° C or lower) and disappearing at about 32 ° C or higher to become colorless. Improved gloss and workability.

[0015]

INDUSTRIAL APPLICABILITY The reversible thermochromic knitting cord of the present invention exhibits a reversible color change in the temperature range of living environment, the repeated thermochromic function is continuously exhibited, and the original flexible cord. The texture is retained, and handicraft thread, blazer, skirt,
Satisfies practicality and decorativeness in various fields where conventional braids are applied, such as clothing, curtains, bags, stuffed animals, doll costumes, ribbons, etc.

[Brief description of drawings]

FIG. 1 is an external view of a reversible thermochromic braid according to the present invention.

[Explanation of symbols]

1 Reversible thermochromic braid 2 Reversible thermochromic synthetic fiber

Claims (2)

[Claims] 1. A synthetic fiber in which a reversible thermochromic pigment having an average particle diameter of 0.1 to 30 μm is fixed in a dispersed state in a proportion of 0.1 to 30% by weight with respect to the fiber, by knitting. A reversible thermochromic braid characterized by. 2. The synthetic fiber has a single fiber thickness of 5 to 5.
The reversible thermochromic braid according to claim 1, which is composed of 0 μm multifilaments.