JP2000201798A - Reversible thermally color changeable hand strap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give a decoration a hand strap and to differentiate the same by reversibly changing color of the hand strap by changes of temperature. SOLUTION: A reversible thermally color changeable composition is microcapsulized to obtain a reversible thermally color changeable microcapsule pigment the dried and dehumidified microcapsule pigment is blended with polypropylene resin and melted and mixed to obtain thermally color changeable polypropylene resin. The resin is spun and elongated to obtain multifilament consisting of reversible thermally color changeable thread. The reversible thermally color changeable thread is made into a round braid by a 8 thread braider to obtain a reversible thermally color changeable braid 2. The reversible thermally color changeable braid 2 is double-folded at the center to super pose both ends and thin thread 3 is inserted through the center part of each tip end part 21 and tied together before plastic protective member 4 is attached to obtain the reversible thermally color changeable hand strap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a reversible thermochromic hand strap. More specifically, the present invention relates to a hand strap that reversibly changes color due to a change in temperature that is coupled to a portable item.

[0002]

2. Description of the Related Art Conventionally, ring-shaped cords, so-called hand straps, have been attached to portable telephones, portable radios, cameras, folding umbrellas and the like in order to make them easy to carry and prevent damage due to falling. Have been. In particular, with regard to a hand strap for a mobile phone, there is a demand for one that pursues decorativeness and one that differentiates with the spread of the telephone. 229,237),
Provided with a case to which a seal is attached (Japanese Patent Laid-Open No. 10-2
No. 01521) and the like.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new hand strap which can provide decorativeness or differentiate.

[0004]

SUMMARY OF THE INVENTION The present invention requires a reversible thermochromic hand strap, which is reversibly discolored by a change in temperature, in a hand strap attached to a portable item. Furthermore, a decorative body is attached to the hand strap, the hand strap and / or the decorative body reversibly change color due to a temperature change, and the hand strap is formed of a braid. ) An electron-donating color-forming organic compound, (ii) an electron-accepting compound, (iii) the above (ii),
(B) A microcapsule pigment enclosing a reversible thermochromic composition composed of a homogeneous compatibilizer of a reaction medium for determining the temperature at which the color reaction occurs is formed by melt-blending in a dispersed state in a thermoplastic resin. Being braided by a reversible thermochromic yarn, the reversible thermochromic yarn is a composite fiber having a reversible thermochromic resin phase as a core and a protective resin phase as a sheath,
It is a requirement that the braid be braided with the reversible thermochromic yarn and the non-thermochromic yarn.

[0005] The hand strap is attached to a portable item to make it easy to carry, and prevents damage due to falling. The material and shape of the hand strap are not particularly limited, but a braid formed by a natural thread or a synthetic thread, a string body formed by a soft resin, a string body obtained by cutting leather into a narrow width, a metal or a plastic Formed chains and the like. As the method of connecting the hand strap and the portable article, there is a method of connecting a thread extending from one end of the ring-shaped hand strap to a joint of the portable article, a metal provided at one end of the ring-shaped hand strap. Alternatively, a method of inserting a resin-made openable and closable ring member into a coupling portion of the portable article and attaching the same, and a method of inserting one end of a hand strap through the coupling section of the portable article and then joining the other end of the hand strap, and the like can be given. . The hand strap may be provided with a decorative body in the form of a doll, an animal, a vehicle, food, a building, a musical instrument, or the like, which is formed of plastic or metal.

In the present invention, in addition to the hand strap itself exhibiting reversible thermochromic properties, the decorative body may exhibit reversible thermochromic properties, or both the hand strap and the decorative body exhibit reversible thermochromic properties. It may be shown.
The structure of the hand strap showing reversible thermochromic properties is
In the case of a metal chain or a string body cut from leather, a reversible thermochromic layer is provided on the surface. In the case of a braid, after impregnating the yarn with the reversible thermochromic material, braiding to form a braid, impregnating the braided braid into the reversible thermochromic material, or spraying the braid surface with reversible heat A discoloration layer is provided. Further, when the yarn is a synthetic yarn, a braid can be formed by braiding a yarn formed by melt-blending a thermochromic material in a dispersed state in a thermoplastic resin. In the case of a string formed of a soft resin, or in the case of a resin chain, after melting the resin and the reversible thermochromic material, forming a string or a chain, the surface of the string or the chain is formed. A reversible thermochromic layer can also be provided.

A system for forming a reversible thermochromic layer on the surface of the hand strap will be described. The reversible thermochromic layer contains a reversible thermochromic composition in a layer, and the composition has an electron donating property. A composition containing three components of an organic compound medium which reversibly causes a color reaction between the color organic compound and the electron accepting compound is preferably used. Specifically, Japanese Patent Publication No. 51-35414, Japanese Patent Publication No. 51-44706
And a reversible thermochromic composition described in JP-A-7-186540. Further, a highly sensitive thermochromic composition having a hysteresis width of 3 ° C. or less with respect to a color density-temperature curve due to a temperature change described in Japanese Patent Publication No. 1-293898 proposed by the present applicant can also be used. The composition discolors before and after a predetermined temperature (discoloration point) as a boundary, and only one specific state can exist in a normal temperature range between the two states before and after the change. That is, the other state is maintained while the heat or cold required for the state to develop is applied, but returns to the state exhibited in the normal temperature range if the application of the heat or cold disappears, so-called, A small hysteresis width (Δ
H) is a type that changes color.

Also, Japanese Patent Publication No. 4-171 proposed by the present applicant.
No. 54, JP-A-7-179777, JP-A-7-179777
The thermochromic composition, which is described in, for example, JP-A-33997 and which exhibits a large hysteresis characteristic and changes color, ie, a curve in which a change in coloring density due to a temperature change is plotted as a temperature. Is a type of composition that discolors by following a significantly different path when the temperature is increased from a lower temperature side than the discoloration temperature range and vice versa. A thermochromic composition having a characteristic of being able to store and retain a state changed at a temperature equal to or lower than the low-temperature side discoloration point or equal to or higher than the high-temperature side discoloration point in a normal temperature range between the high-temperature side and the high-temperature side discoloration point is also effective.

Although the above-mentioned reversible thermochromic composition is effective even when applied as it is, it is preferable to use it in a microcapsule. This is because the reversible thermochromic materials are maintained at the same composition under various conditions of use, and can exhibit the same effects. By being encapsulated in the microcapsules, a chemically and physically stable pigment can be constituted, and the particle diameter is 0.1 to 100 μm, preferably 1 to 100 μm.
The range of ５０50 μm, more preferably 2-30 μm satisfies the practicality. The microencapsulation is performed by a conventionally known interfacial polymerization method, in situ polymerization method, in-liquid curing coating method, phase separation method from an aqueous solution, phase separation method from an organic solvent, a melting dispersion cooling method, an air suspension. There are a coating method, a spray drying method, and the like, which are appropriately selected according to the application. Further, a secondary resin film may be further provided on the surface of the microcapsules according to the purpose to impart durability or to modify the surface characteristics for practical use.

The reversible thermochromic composition or the microcapsules containing the same are dispersed in an appropriate medium such as water or an organic solvent containing a transparent resin and applied as a reversible thermochromic material such as ink or paint. And conventionally known methods, for example,
Reversible thermochromic layer by means of printing such as screen printing, offset printing, gravure printing, coater, tampo printing, transfer, brush coating, spray coating, electrostatic coating, electrodeposition coating, flow coating, roller coating, dip coating, etc. Can be provided.

Further, the color change may be varied by mixing a colorant such as a general pigment, a fluorescent pigment, a white pigment such as titanium dioxide, a pearl pigment, a metal powder or a luminous pigment into the reversible thermochromic layer. Can be used, and a conventional light stabilizer, for example, a light stabilizer selected from an ultraviolet absorber, an antioxidant, an antioxidant, a singlet oxygen quencher, an ozone decolorant, a visible light absorber, and an infrared absorber May be appropriately compounded. In addition,
The reversible thermochromic layer may be a character, a symbol, a pattern, a combination of straight lines and curves, a dot, or an image formed by a set of dot images.

When the hand strap is formed of a soft resin, a microcapsule containing the reversible thermochromic composition is blended in a thermoplastic resin such as a polyester resin or a vinyl chloride resin as a molding resin and molded into an appropriate shape. Is obtained. Further, when formed by a resin chain, it is obtained by blending a microcapsule containing the reversible thermochromic composition in a thermoplastic resin or a thermosetting resin as the molding resin and molding it into an appropriate shape. . In addition, examples of the molding method include injection molding, extrusion molding, and hollow molding.

The resin contained in the reversible thermochromic layer or the resin used for molding the hand strap may be a transparent film-forming resin, and various conventional resins can be used. As the resin, an ionomer resin,
Isobutylene-maleic anhydride resin copolymer resin, acrylonitrile-acrylic styrene copolymer resin, acrylonitrile-styrene copolymer resin, acrylonitrile-
Butadiene-styrene copolymer resin, acrylonitrile chlorinated polyethylene-styrene copolymer resin, ethylene-vinyl chloride copolymer resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl acetate-vinyl chloride graft copolymer resin, vinylidene chloride resin, chloride Vinyl resin, chlorinated vinyl chloride resin, vinyl chloride-vinylidene chloride copolymer resin, chlorinated polyethylene resin, chlorinated polypropylene resin, polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polycarbonate resin, polystyrene resin, high-impact polystyrene resin , Polypropylene resin, polymethylstyrene resin, polyacrylate resin, polymethylmethacrylate resin, epoxy acrylate resin, alkylphenol resin, rosin-modified resin Knol resin, rosin-modified alkyd resin, phenol-modified alkyd resin, epoxy resin-modified alkyd resin, styrene-modified alkyd resin, acryl-modified alkyd resin, aminoalkyd resin, vinyl chloride-vinyl acetate resin, styrene-butadiene resin, epoxy resin, unsaturated Polyester resin, saturated polyester resin, polyurethane resin, alkyd resin, natural rubber,
Polyisobutylene, butyl rubber, polyvinyl alkyl ether, rosin, rosin ester, rosin derivative, polyterpene resin, oil-soluble phenol resin, petroleum hydrocarbon resin, shellac, cyclized rubber, vinyl acetate emulsion resin, styrene-butadiene emulsion resin, Acrylic ester emulsion resin, water-soluble alkyd resin, water-soluble melamine resin, water-soluble urea resin, water-soluble phenol resin, water-soluble epoxy resin, water-soluble polybutadiene resin, cellulose acetate, cellulose nitrate, ethyl cellulose, etc. it can.

Further, a homogeneously compatible solution of an electron-donating color-forming organic compound, a compound having a phenolic hydroxyl group, and a reaction medium for determining the temperature at which both of the above-mentioned color reactions occur is made of a vinyl chloride-vinyl acetate copolymer resin. The reversible thermochromic layer can also be formed using a thermochromic material described in JP-A-6-135144, which is obtained by dispersing the thermochromic material in fine particles.

When a braid is used as the hand strap, the yarn is immersed in a paint containing the reversible thermochromic composition or a microcapsule containing the same to form a reversible thermochromic yarn. Thus, a reversible thermochromic braid can be obtained. Also, a reversible thermochromic braid can be obtained by immersing a previously braided braid in the paint or by spray-coating the braid surface using the paint.

When a synthetic yarn is used as the yarn forming the braid, the yarn formed by melt-blending microcapsules containing the thermochromic composition in a thermoplastic resin in a dispersed state is braided. Braids can also be formed. Examples of the thermoplastic resin include polyolefin resins such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and polypropylene; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; 6-nylon, 6,6 nylon, and 12 nylon. , 6
Examples thereof include polyamide resins such as -6,6 copolymer nylon and 6-12 copolymer nylon, and polyvinyl chloride resins.
The above-described reversible thermochromic yarn composed of the thermoplastic resin and the microcapsules, when spinning, in addition to forming a yarn by adding the microcapsules together with the thermoplastic resin, a pellet in which the microcapsules are blended in advance in the thermoplastic resin. It can also be used to obtain a yarn with a melt spinning device. The microcapsules are used in an amount of 0.1 to 30 parts by weight per 100 parts by weight of the thermoplastic resin.
Parts by weight, preferably 1 to 10 parts by weight, form reversible thermochromic yarns. If the amount is less than 0.1 part by weight, it is difficult for the encapsulated reversible thermochromic composition to obtain a desired color density in a color-developed state, and if it exceeds 30 parts by weight, the number of microcapsules becomes excessive and non-melting in the thermoplastic resin occurs. The spinnability is reduced due to the presence of the portion, making the melt spinning difficult, and may cause residual color in the decolored state.

Further, as the reversible thermochromic yarn, a conjugate fiber having a reversible thermochromic resin phase as a core and a protective resin phase as a sheath may be used. The thermoplastic resin forming the thermochromic resin phase includes polyolefins such as polyethylene, polypropylene, modified polyethylene and modified polypropylene, polyamides such as nylon 12, nylon 11, nylon 6, nylon 6-12 copolymer, and nylon elastomer. Resins, polyester resins such as polybutylene terephthalate and polyhexamethylene terephthalate. In the case of a thermoplastic resin having a melting point or softening point exceeding 230 ° C., when melt-mixed with a microcapsule, generation of a decomposition gas, which is considered to be due to its heat resistance, and a decrease in discoloration performance are observed. Is inhibited. Accordingly, those having a melting point or softening point in the range of about 120 ° C. to 200 ° C. are practically suitable, and are appropriately selected from the thermoplastic resins described above and put to practical use.

As the fiber-forming thermoplastic polymer forming the protective resin phase, a crystalline polymer satisfying spinnability and fiber performance is effective, and examples thereof include polyamide resins and polyester resins. More specifically, examples of the polyamide resin include nylon 6, nylon 66, nylon 12, and nylon 6-12 copolymer. Examples of the polyester resin include polyhexamethylene terephthalate, polybutylene terephthalate, and the like. In the polybutylene terephthalate-based polymer, other components, for example, isophthalic acid, adipic acid, sebacic acid,
It is preferable to copolymerize a dicarboxylic acid component such as phthalic acid and a diol component such as ethylene glycol, diethylene glycol, propylene glycol, and cyclohexane dimethanol. Of these, isophthalic acid is preferable in terms of fiber properties.

Here, the composite fiber may be any one as long as the thermochromic resin phase and the protective resin phase are joined and integrated, and are not limited to the core-sheath type, but may be of a lamination type, a sea-island type or the like. It may be in a form. In the core-in-sheath type, since the protective resin phase covers the entire periphery of the thermochromic resin phase, it satisfies the durability such as light fastness, washing fastness and friction fastness, and is transparent and glossy. By forming a protective resin phase with a fiber-forming thermoplastic polymer rich in chromium, a clear color change of the thermochromic resin phase can be visually recognized, and a thermochromic conjugate fiber rich in gloss can be obtained. The core and the sheath,
The combination of resins with the same structure provides excellent bonding properties at the core-sheath interface, no danger of peeling off, and provides integrated high-strength fiber properties, as well as identical properties with the same refractive index Because of the combination of these resins, it is rich in transparency and gloss. In particular, it is effective that the core and the sheath are formed of a polyamide resin having the same structure. Furthermore, in the fiberization step, particularly in the drawing step, the stretchability between the resins is the same, so that a constant draw ratio can be set, and a conjugate fiber having the desired fiber strength can be obtained. The thermoplastic resin in which the microcapsules are melt-blended is selected according to the thermal and chemical compatibility with the microcapsules, but if the resin for the core and the resin for the sheath are the same combination, Since it is not necessary to consider the chemical influence at the time of joining the two, no extra work is required.

[0020] The microcapsules containing the reversible thermochromic composition dispersed in the thermoplastic resin include a thermosetting resin wall film coated with a homogeneous compatible solution of the thermochromic composition. It is preferable that the non-circular cross-sectional shape has a recess. This is because the pressure can be moderately elastically deformed by the external pressure and the pressure can be moderated.Therefore, in the fiberization step, the microcapsules tend to be oriented in the axial direction. This is because the desired thermochromic function can be effectively exhibited because there is no need to do so. The amount of the microcapsules added is 1 to 70% by weight, more preferably 5 to 40% by weight, based on the total weight of the thermochromic resin phase. If it is less than 1% by weight, the discoloration property and color density which are preferable as the conjugate fiber cannot be obtained, and the discoloration function cannot be satisfied. On the other hand, if the amount exceeds 70% by weight, no remarkable improvement in the discoloration density is observed, and the fluidity at the time of fiberization is remarkably reduced, and the spinnability is extremely deteriorated.

The reversible thermochromic yarns may contain a conventional light stabilizer such as an ultraviolet absorber, an antioxidant, an antioxidant, a singlet oxygen quencher, an ozone decolorant, a visible light absorber, A light stabilizer selected from infrared absorbers may be appropriately blended, or a colorant may be mixed to make the color change versatile.

The reversible thermochromic yarn formed as described above is used to form a flat reversible thermochromic braid or a round braid using a braiding machine such as a flat braiding machine or a round braiding machine. Manufacture reversible thermochromic braids. Examples of the form of the braid include forms such as three-strike, four-strike, six-strike, eight-stroke, sixteen-stroke, twenty-four-stroke, and loose-strike.

As the yarn constituting the reversible thermochromic braid, not only a yarn formed by melt-blending the microcapsule pigment in a dispersed state in a thermoplastic resin, but also various non-thermochromic yarns may be used in combination. Can also be used. Examples of the non-thermochromic yarn include conventionally known non-thermochromic synthetic yarns and natural yarns, and yarns colored with the coloring agent can also be used.

The hand strap formed of a woven or knitted fabric can be embroidered using the reversible thermochromic yarn.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The reversible thermochromic hand strap according to the present invention is, as described above, provided with a reversible thermochromic layer on the strap, or molded into a hand strap by blending a reversible thermochromic material in a resin. In the case of a braid, it is obtained by obtaining a hand strap using a reversible thermochromic thread, and specific embodiments include, for example, a mobile phone, a mobile radio, a camera, a video camera, a folding umbrella, a flashlight,
It is used for pocket watches, portable game machines, insect collecting boxes, wallets, handbags, key cases, measures, containers for storing various portable articles, and the like.

[0026]

EXAMPLES The reversible thermochromic hand strap of the present invention will be specifically described by the following examples, but the present invention is not limited by these examples. In addition, the composition in an Example shows a weight part.

Example 1 Preparation of a reversible thermochromic microcapsule pigment 2 parts of 1,2-benz-6-diethylaminofluoran
A reversible thermochromic composition comprising 6 parts of 1,1-bis (4-hydroxyphenyl) -n-octane and 50 parts of stearyl caprate is microencapsulated by an epoxy resin / amine interfacial polymerization method to obtain an average particle diameter. 10-20μ
m of reversible thermochromic microcapsule pigment was obtained. The microcapsule pigment reversibly changes color to a color above 34 ° C. and to a pink color below 28 ° C.

Spinning of reversible thermochromic yarn 10 parts of dried and dehydrated microcapsule pigment and 300 parts of polypropylene resin (melt flow 45) are mixed, and melt-mixed at 180 ° C. in an extruder for thermochromic discoloration. A functional polypropylene resin was obtained. The resin is 34
The color reversibly changes to white at 28 ° C or higher and pink at 28 ° C or lower. Next, the resin is spun at 180 ° C. from a die having 24 discharge holes using a general-purpose melt spinning device,
By stretching, 24 outer diameters of about 80 μm (4
A multifilament consisting of the reversible thermochromic yarn 0d) was obtained.

Production of Reversible Thermochromic Braid The above-mentioned reversible thermochromic yarn was tied using an eight-strand round string lacing machine. The reversible thermochromic braid obtained as described above is a braid that exhibits a white color at 34 ° C or higher and a pink color at 28 ° C or lower, and does not impair the thermochromic function even after repeated use. A reversible thermochromic braid satisfying the properties and flexibility was obtained.

Manufacture of a reversible thermochromic hand strap (see FIG. 1) The reversible thermochromic braid 2 is folded in two from the center and the tips are overlapped, and a narrow thread is attached to the center of each tip 21. After inserting and tying the protective straps 3, the protective member 4 made of plastic was attached to obtain the reversible thermochromic hand strap 1. When the reversible thermochromic hand strap is used by attaching it to a mobile phone, the portion of the hand strap held by the hand changes from pink to white, and when left for a while, returns to the original pink color (not shown), This change in appearance could be repeated by changing the temperature.

Example 2 (see FIGS. 2 to 4) 1.5 parts of the reversibly thermochromic microcapsule pigment prepared in Example 1, 0.1 part of a yellow pigment, a vinyl chloride-vinyl acetate copolymer resin and an acrylate ester A reversible thermochromic coating composed of 15 parts of a spray vehicle containing a resin as a main component was prepared. Reversible thermochromic decorative body 5 obtained by spray-coating the reversible thermochromic paint on a star-shaped decorative body made of vinyl chloride resin
Was connected to the protective member 4 of the reversible thermochromic hand strap obtained in Example 1. When the reversible thermochromic hand strap 1 (FIG. 2) obtained as described above is used by attaching it to a mobile phone, the portion of the hand strap 2 held by the hand changes from pink to white (FIG. 3). ), The color returned to the original pink color when left for a while, changed from red to yellow when the decorative body was grasped by hand (FIG. 3), and returned to the original red color again when left for a while. This change in appearance could be repeated by changing the temperature.

Example 3 15 parts of the reversible thermochromic microcapsule pigment prepared in Example 1 and a 50% acrylic polyol / xylene solution 40
Parts, a polyisocyanate-based curing agent (6 parts) and xylene (40 parts) were uniformly mixed and sprayed onto a metal chain to obtain a reversible thermochromic hand strap. When the reversible thermochromic hand strap is used by attaching it to a handbag, the part held by the hand of the hand strap changes from pink to silver, and when left for a while, returns to the original pink again, and this appearance change is caused by a temperature change. Could be repeated.

Example 4 30 parts of the reversible thermochromic microcapsule pigment prepared in Example 1, 70 parts of an acrylate resin emulsion,
A dyeing liquid comprising 1 part of a curing agent was obtained. After the braid made of polyester filament was immersed in the dyeing solution, it was squeezed using a roll, heated and dried to obtain a reversible thermochromic braid. Using the reversible thermochromic braid, a reversible thermochromic hand strap was obtained in the same manner as in Example 1. When the reversible thermochromic hand strap is used by attaching it to a portable umbrella, the portion of the hand strap held by the hand changes from pink to white, and when left for a while, returns to the original pink color, and this appearance change is caused by temperature. The change could be repeated.

Example 5 The thermochromic polypropylene resin obtained in Example 1 was supplied to an extruder for forming a core portion, and the polypropylene resin was supplied to an extruder for forming a sheath portion. And a reversible thermochromic conjugate fiber (reversible thermochromic yarn) having a core / sheath ratio of 6/4 was obtained.

Using the reversible thermochromic conjugate fiber, a reversible thermochromic braid was produced in the same manner as in Example 1, and a reversible thermochromic hand strap was obtained. When the reversible thermochromic hand strap is used by attaching it to a mobile phone, the portion of the hand strap held by the hand changes from pink to white, and when left for a while, returns to the original pink color, and this appearance change is caused by temperature. The change could be repeated. Further, the hand strap was excellent in glossiness and high in commercial value.

Example 6 Spinning of Reversible Thermochromic Yarn 10 parts of dried and dehydrated microcapsule pigment prepared in Example 1 and nylon resin (mp 180 ° C.) 3
And then melt-mixed at 200 ° C. with an extruder to obtain a thermochromic nylon resin. The resin is 3
The color reversibly changes to white at 4 ° C or higher and pink at 28 ° C or lower. Next, a reversible thermochromic yarn was produced in the same manner as in Example 1 using the resin, and further, a braid was formed using the reversible thermochromic yarn to obtain a reversible thermochromic braid. Further, after printing the letters “ABC” on the surface of the reversible thermochromic braid using a white screen printing ink, a reversible thermochromic hand strap was obtained in the same manner as in Example 1. When the reversible thermochromic hand strap 1 is used by attaching it to a mobile phone (not shown), the portion of the hand strap held by the hand changes the background of the letters “ABC” from pink to white. The characters are not visible, and if left for a while, the color returns to the original pink color again, and the characters "ABC" become visible. This change in appearance could be repeated by changing the temperature.

Example 7 10 parts of the microcapsule pigment obtained in Example 1 was placed on a surface of a white vinyl chloride resin hand strap having a width of 5 mm and a thickness of 1 mm in 90 parts of a vehicle for screen printing of a vinyl chloride-vinyl acetate copolymer resin. The pattern was printed using a printing ink that was uniformly dispersed to obtain a reversible thermochromic hand strap. When the reversible thermochromic hand strap is used by attaching it to a mobile umbrella, the floral pattern provided on the portion of the hand strap held by the hand changes from pink to colorless, and returns to the original pink again after being left for a while. This change in appearance could be repeated by changing the temperature.

Example 8 Using the four reversible thermochromic yarns obtained in Example 5 and four non-thermochromic white polypropylene yarns, an eight-strand braid was formed in a striped pattern. Using the reversible thermochromic braid, a reversible thermochromic hand strap was obtained in the same manner as in Example 1. When the reversible thermochromic hand strap is used by attaching it to a mobile phone, it becomes a pink and white striped pattern at 28 ° C or lower, and becomes a white solid at 34 ° C or higher. Could be repeated.

Example 9 Preparation of reversible thermochromic microcapsule pigment 3- (2-ethoxy-4-diethylaminophenyl)-
3- (1-ethyl-2-methylindol-3-yl)
1 part of -4-azaphthalide, 6 parts of 1,1-bis (4-hydroxyphenyl) -n-octane, cetyl caprate 5
0 parts of the reversible thermochromic composition,
Microencapsulation was performed by an amine interfacial polymerization method to obtain a reversible thermochromic microcapsule pigment having an average particle size of 10 to 20 μm. The microcapsule pigment reversibly changes color to colorless at 28 ° C or higher and blue at 20 ° C or lower.

Spinning of reversible thermochromic yarn Dry and dehydrated microcapsule pigment 10
, 0.5 parts of a pink fluorescent pigment and 300 parts of a polypropylene resin (melt flow 45) were mixed and melt-mixed at 180 ° C. with an extruder to obtain a thermochromic polypropylene resin. The resin is pink at 28 ° C or higher, 2
The color changes reversibly to bluish purple below 0 ° C. The thermochromic polypropylene resin is supplied to an extruder for forming a core portion, and the polypropylene resin is supplied to an extruder for forming a sheath portion, and is spun through 18 discharge holes using a composite fiber spinning device to obtain core / sheath = A 6/4 reversible thermochromic conjugate fiber (reversible thermochromic yarn) was obtained.

Production of reversible thermochromic braid Using the above-mentioned four reversible thermochromic yarns and the four reversible thermochromic yarns obtained in Example 5, using an eight-punched round string machine. I made it. The reversible thermochromic braid obtained as described above shows a pink and white stripe pattern at 34 ° C or higher, the entire surface turns pink at 28 to 34 ° C, and a bluish purple and pink at 20 ° C or lower. A reversible thermochromic braid, which is a braid showing a color stripe pattern and which satisfies the durability and flexibility without impairing the thermochromic function even by repeated use.

Production of Reversible Thermochromic Hand Strap A reversible thermochromic hand strap was obtained by the same production method as in Example 1 using the reversible thermochromic hand strap. When the reversible thermochromic hand strap is used by attaching it to a mobile phone, the entire surface becomes pink when warmed by hand from blue-violet and pink stripes in winter (environmental temperature is 20 ° C. or less) and further warmed And pink and white stripes,
In summer (environmental temperature is 28-34 ° C), the entire surface is pink, and when warmed by hand, it shows pink and white stripes,
I could easily see the color change throughout the year.

[0043]

The reversible thermochromic hand strap according to the present invention is a hand strap which exhibits a reversible color change due to a temperature change and which can impart decorativeness or differentiate by a color changing function. Can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a reversible thermochromic hand strap of the present invention.

FIG. 2 is a perspective view showing a state before discoloration of another embodiment of the reversible thermochromic hand strap of the present invention.

FIG. 3 is a perspective view showing a state after discoloration of the reversible thermochromic hand strap of FIG. 2;

FIG. 4 is an exploded perspective view of the reversible thermochromic hand strap shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reversible thermochromic hand strap 2 Braid 21 Tip 3 Thread 4 Protective member 5 Decorative body

Claims (5)

[Claims] 1. A reversible thermochromic hand strap, wherein the hand strap is reversibly discolored by a temperature change. 2. The reversible thermochromic hand strap according to claim 1, wherein a decorative body is attached to the hand strap, and the hand strap and / or the decorative body reversibly change color due to a temperature change. 3. The hand strap is formed by a braid, wherein the braid comprises (a) an electron-donating color-forming organic compound, (b) an electron-accepting compound, (c) the (a),
(B) A microcapsule pigment enclosing a reversible thermochromic composition composed of a homogeneous compatibilizer of a reaction medium for determining the temperature at which the color reaction occurs is formed by melt-blending in a dispersed state in a thermoplastic resin. 3. The reversible thermochromic hand strap according to claim 1, which is braided with reversible thermochromic yarn. 4. The composite fiber according to claim 3, wherein the reversible thermochromic yarn is a composite fiber having a core of a reversible thermochromic resin phase and a sheath of a protective resin phase. Reversible thermochromic hand strap. 5. The reversible thermochromic hand strap according to claim 3, wherein the braid is braided by the reversible thermochromic yarn and the non-thermochromic yarn.