JPH07177901A - Shoes - Google Patents

Abstract

PURPOSE:To reduce the weight of shoes, to obtain good absorptivity and to inexpensively produce the shoes with high productivity by using a high polymer org. material having a three-dimensional continuous net skeleton structure and a low molecular material as essential components of an shock absorptive material to be disposed in shoes. CONSTITUTION:The heel part of an insole 2 of the shoes 1 is provided with a high polymer blended material 3 and the tread part of the insole 5 of the shoes 4 is provided with the similar high polymer blended material, by which a good wearing feel is obtd. and the shock at the time of walking is decreased. The high polymer blended material 3 as the shock absorptive material consists essentially of the high polymer org. material and the low molecular material and the contact ratio of the high polymer org. material is lower than that of the low molecular material. The high polymer org. material is a thermoplastic polymer having a number average mol.wt. of >=20000 and above all >=40000, and the three-dimensional continuous net skeleton structure.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to shoes, and in particular,
The present invention relates to shoes that are extremely comfortable to wear.

[0002]

2. Description of the Related Art Insoles such as leather shoes (men's shoes, women's shoes), sports shoes, chemical shoes, and other rubber footwear such as sandals absorb shocks during walking and are comfortable to wear without being tired. In order to make it into a thing, various things are provided about the shape and the material.

Further, especially for sports shoes,
For the purpose of safety, not only the insole but also the tip of the shoe (toe), heel, ankle, and instep are provided with a material for absorbing shock.

[0004] Conventionally, as a shock absorbing material for the insole of shoes, a mixture of rubber with a lightweight filler such as cork, urethane, silicone or the like has been used.

[0005]

As a shock absorbing material such as an insole of shoes, it is required to have a sufficient shock absorbing property, be lightweight, have excellent productivity, and be provided at a low cost.

Therefore, there is a demand for the development of a shoe using an impact absorbing material having these properties, physical properties, and productivity further improved.

The present invention has been made in view of the above conventional circumstances, and provides a shock absorbing material which has a remarkably good shock absorbing property, can be reduced in weight, and can be manufactured at a low cost with high productivity. The purpose is to provide the used shoes.

[0008]

The shoe according to claim 1,
In a shoe having an impact absorbing material, the impact absorbing material is a polymer blend material containing a high molecular weight organic material and a low molecular weight material as main components, and the content ratio of the high molecular weight organic material is lower than the content rate of the low molecular weight material. It is characterized in that the polymer organic material is composed of a polymer blend material having a three-dimensional continuous network skeleton structure.

That is, the inventors of the present invention have conducted extensive studies as to shoes having excellent characteristics, and as a result, the polymer blend material according to the present invention has various characteristics such as impact absorption characteristics and hardness. As a result, the inventors have found that shoes having extremely good properties such as the above can be obtained by using this polymer blend material as an impact absorbing material, and have completed the present invention.

The present invention will be described in detail below.

In the present invention, the high molecular weight organic material has a number average molecular weight of 20,000 or more, particularly 30,000.
A thermoplastic high molecular weight organic material of 0 or more, particularly 40,000 or more is preferable, and examples thereof include styrene-based (butadiene styrene-based, isoprene styrene-based), vinyl chloride-based, olefin-based (butadiene-based, isoprene-based, ethylene propylene-based). Etc.), ester-based, amide-based, urethane-based and other various thermoplastic elastomers, and their hydrogenated and other modified products, styrene-based, ABS-based,
Olefin series (ethylene series, propylene series, ethylene propylene series, ethylene styrene series, propylene styrene series, etc.), vinyl chloride series, acrylic ester series (methyl acrylate series, etc.), methacrylic acid ester series (methyl methacrylate series, etc.) , Carbonate type, acetal type, nylon type, halogenated polyether type (chlorinated polyether type, etc.), halogenated olefin type (tetrafluoroethylene type, fluorinated-ethylene chloride type, fluorinated ethylene propylene type, etc.), cellulose Examples thereof include thermoplastic resins such as resins (acetyl cellulose, ethyl cellulose, etc.), vinylidene, vinyl butyral, alkylene oxides (propylene oxide, etc.), and rubber modified products of these resins.

As the thermoplastic polymer material, it is particularly preferable to use a material in which a portion which easily forms a hard block such as a crystal structure or an agglomerate structure and a soft block such as an amorphous structure are mixed together. Specifically,
The following (i) to (iii) are mentioned.

(I) Block copolymer of polyethylene and ethylene-styrene random copolymer obtained by hydrogenating a block copolymer of polybutadiene and butadiene-styrene random copolymer (ii) Polybutadiene and polystyrene Block copolymer of, or a block copolymer of polyethylene and polystyrene obtained by hydrogenating a block copolymer of polybutadiene or ethylene-butadiene random copolymer and polystyrene (iii) ethylene-propylene rubber Particularly, those having a block copolymer structure of polyethylene and an ethylene-styrene random copolymer are preferable.

These various thermoplastic polymer organic materials are mainly used alone, but two or more kinds may be blended and used.

On the other hand, as the low molecular weight material, the viscosity at 100 ° C. is not more than 5 × 10 ⁵ centipoise, especially 1 × 10 5.
It is preferably ⁵ centipoise or less, and from the viewpoint of molecular weight, the number average molecular weight of the low molecular weight material is 20,0.
00 or less, especially 10,000 or less, especially 5,000
The following is preferable. As such a low molecular weight material, a material that is liquid or liquid at room temperature is usually preferably used. Further, both hydrophilic and hydrophobic low molecular weight materials can be used. The low molecular weight material is not particularly limited, but the following materials are suitable.

Softeners: Mineral oil-based, vegetable oil-based, synthetic-based softeners for various rubbers or resins. Examples of the mineral oil-based oil include process oils such as aromatic oils, naphthene oils, and paraffin oils. As vegetable oils, castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil,
Examples include coconut oil, peanut oil, wood wax, pine oil, olive oil and the like.

Plasticizers: various ester plasticizers such as phthalic acid esters, mixed phthalic acid esters, aliphatic dibasic acid esters, glycol esters, fatty acid esters, phosphoric acid esters, stearic acid esters, epoxy plasticizers, etc. Plasticizer for plastics or phthalate type,
Adipate-based, sebacate-based, phosphate-based, polyether-based, polyester-based, etc. plasticizers for NBR.

Tackifier: Various tackifiers such as coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon, rosin derivative and the like.

Oligomer: Crown ether, fluorine-containing oligomer, polyisobutylene, xylene resin, chlorinated rubber, polyethylene wax, petroleum resin, rosin ester rubber, polyalkylene glycol diacrylate,
Liquid rubber (polybutadiene, styrene-butadiene rubber, butadiene-acrylonitrile rubber, polychloroprene, etc.), silicone-based oligomers, various oligomers such as poly-α-olefins.

Lubricants: hydrocarbon lubricants such as paraffin and wax, fatty acid lubricants such as higher fatty acids and oxyfatty acids, fatty acid amide lubricants such as fatty acid amides and alkylenebisfatty acid amides, fatty acid lower alcohol esters, fatty acid polyhydric alcohol esters. , Ester-based lubricants such as fatty acid polyglycol esters, alcohol-based lubricants such as fatty alcohols, polyhydric alcohols, polyglycols and polyglycerols, various lubricants such as metal soaps and mixed lubricants.

These low molecular weight materials may be used alone or in combination of two or more.

In the present invention, in order to obtain a polymer blend material containing a large amount of a low molecular weight material with a large amount of a low molecular weight material and a high molecular weight organic material, the solubility of each of the low molecular weight material and the high molecular weight organic material used Parameter value δ (= ΔE /
V) ^1/2 (ΔE = molar evaporation energy, V = molar volume)
Difference of 3.0 or less, preferably 2.5 or less,
It is preferable to select both materials. If this difference exceeds 3.0, from the viewpoint of compatibility of both materials, it is difficult to retain a large amount of low molecular weight materials, which is an obstacle to lowering the elastic modulus of the obtained polymer blend material. Is likely to occur, which is not preferable.

If necessary, the polymer blend material according to the present invention may further contain the following fillers. That is, clay, diatomaceous earth, carbon black, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxides, mica, graphite, scale-like inorganic fillers such as aluminum hydroxide, various metal powders,
Wood chips, glass powder, ceramics powder, granular or powder solid filler such as granular or powder polymer, other various natural or artificial short fibers, long fibers (for example, straw, hair, glass fiber, metal fiber, various other Polymer fibers and the like) can be blended.

Further, it is possible to reduce the weight by blending a hollow filler, for example, an inorganic hollow filler such as a glass balloon or a silica balloon, or an organic hollow filler made of polyvinylidene fluoride, a polyvinylidene fluoride copolymer or the like. . Further, in order to improve various physical properties such as weight reduction, it is possible to mix various foaming agents, and it is also possible to mechanically inject gas during mixing or the like.

By the way, the loss tangent of the polymer blend material constituting the shock absorbing material of the shoe of the present invention is 0.
It is preferably in the range of 1 to 1.0. If this loss tangent is less than 0.1, for example, the impact absorption effect at the time of landing is insufficient, and if it exceeds 1.0, on the contrary, a force is required to kick up the ground to proceed, and both of them are shoes. Is not preferable.

The loss tangent is a value measured by a shear dynamic viscoelasticity tester (manufactured by Toyo Seiki Co., Ltd.) under the conditions of 25 ° C. and 5 Hz.

In order to provide such a loss tangent, the three-dimensional continuous reticulated skeleton structure formed of the polymer organic material constituting the polymer blend material has an average skeleton diameter of 5
0 μm or less, preferably 30 μm or less, the average diameter of cells (mesh) is 500 μm or less, preferably 300 μm or less, and the volume fraction of the polymer organic material is [volume of polymer organic material / (volume of polymer organic material + Volume of low molecular weight material)]
When defined as × 100 (%), it is desirable that the volume fraction of the polymer organic material be 30% or less, and particularly 25% or less.

The polymer blend material used in the present invention comprises a predetermined amount of a high molecular weight organic material and a low molecular weight material and, if necessary, other compounding agents to form a three-dimensional continuous network skeleton structure of the high molecular weight organic material. It can be obtained by mixing under possible mixing conditions. In this case, while having a uniform three-dimensional continuous network skeleton structure of a high molecular weight organic material,
In order to obtain a polymer blend material having less bleeding of low molecular weight material and satisfying the above-mentioned loss tangent, it is preferable to use a high shear type mixer as a mixer, and especially, a fixed wall and a rotating rotor Between the fixed wall and the rotating part (rotor), the clearance (clearance) is t (m), and the rotating peripheral speed of the rotor is v (m / sec). , If the shear rate V of the rotor is defined as V = v / t (sec ⁻¹ ), then V ≧ 5.0 × 10 ² (sec ⁻¹ ) and preferably V ≧ 1.0 × 10 ³ (sec ⁻¹ ). More preferably, it is advantageous to use a high shear type special mixer that satisfies V ≧ 2.5 × 10 ³ (sec ⁻¹ ) and most preferably V ≧ 5.0 × 10 ³ (sec ⁻¹ ).

The polymer blend material according to the present invention is not particularly limited, such as ordinary bulk, gel, foam, etc., but is in a gel state, in particular, a three-dimensional continuous uniform network made of a thermoplastic polymer material. Those in a gel state having a skeletal structure are particularly effective for the present invention.

The structure of the shock absorbing material of the shoe of the present invention is not particularly limited, and may be composed only of the above-mentioned polymer blend material, and existing polymers such as silicone, polyurethane and polyethylene. It may be used in combination with a material such as a laminated structure. In addition, urethane-based, polyvinyl acetate-based,
It is also possible to use it by coating an organic material such as silicone or cloth.

In the shoe of the present invention, there is no particular limitation on the location of the impact absorbing material made of such a polymer blend material, and there are no particular restrictions.
2 (a) (plan view), (b), as shown in FIG. 2 (a) (cross-sectional view taken along the line BB), the polymer blend material 3 is provided on the heel of the insole 2 of the shoe 1. (B- in FIG. 2 (a)
As shown in the sectional view taken along the line B), the polymer blend material 6 may be provided on the stepped portion of the insole 5 of the shoe 4. Further, as shown in FIG. 3 (cross-sectional view), in the shoe 7 such as sports shoes that needs protection of the foot, the instep part 7A, the toe part 7B, the sole part 7C,
A polymer blend material may be provided on each of the heel portion 7D and the ankle portion 7E.

In the present invention, the impact absorbing material made of a polymer blend material may be distributed on the insole of a shoe, for example, as follows. That is, a sheet having a predetermined thickness is prepared from a polymer blend material, and then punched or cut into an appropriate size and placed in the insole. Alternatively, the polymer blend material is poured into a mold having a predetermined shape, cooled, molded, and then placed in the insole. Alternatively,
Many methods can be applied, such as casting a polymer blend material directly into an insole having voids formed in a predetermined shape and using it as an integrated body.

The shoe of the present invention is suitable for all kinds of shoes such as leather shoes, sports shoes, chemical shoes, and other footwear such as sandals, and provides a comfortable shoe due to its excellent shock absorbing performance.

[0034]

[Function] Mainly composed of high molecular weight organic materials and low molecular weight materials,
A polymer blend material in which the content of the high molecular weight organic material is lower than that of the low molecular weight material, and the high molecular weight organic material has a three-dimensional continuous network skeleton structure, is soft and appropriate. It exhibits excellent properties as a shock absorbing material for shoes in terms of elasticity, compression characteristics, hardness and the like, and is economically producible with higher productivity. In particular, when a thermoplastic polymer organic material is used, shoes excellent in moldability and recyclability are provided.

[0035]

EXAMPLES The present invention will be described in more detail with reference to the following examples.

Example 1 The materials shown in Table 1 are blended as shown in Table 1 by using a high-shear type special mixer ("TK Auto Homo Mixer" manufactured by Tokushu Kika Kogyo Co., Ltd.). Mixing under mixing conditions gave a polymer blend material with a uniform appearance.

After the mixing was completed, the obtained polymer blend material was poured into a mold while keeping it at a high temperature and cooled to a thickness of 3
After obtaining a sheet having a diameter of 30 mm, the sheet is punched out into a diameter of 30 mm and placed in an insole having a void of a diameter of 30 mm in advance, as shown in FIGS. Was produced, and walking shoes were produced using this insole.

The obtained shoes were excellent in shock absorbing performance on the soles of the shoes, were extremely comfortable to wear, and had little fatigue of the feet after walking for a long time as compared with the conventional shoes. .

The loss tangent of this polymer blend material was 0.4, and when a section of this polymer blend material was cut out and observed with an optical microscope, it was found that a three-dimensional continuous material composed of a thermoplastic polymer organic material was used. It was confirmed that the reticulated structure (average skeleton diameter 5 μm, average cell diameter 15 μm) was formed.

[0040]

[Table 1]

[0041]

As described in detail above, according to the shoe of the present invention, since the shock absorbing performance of the shock absorbing material is remarkably good, it is comfortable to wear, the shock during walking is reduced, and after long walking. Even in, shoes with less foot fatigue are provided. Moreover, the polymer blend material according to the present invention can be produced with high productivity and is excellent in economic efficiency.

[Brief description of drawings]

FIG. 1 (a) is a plan view showing an embodiment of a shoe of the present invention, and FIG. 1 (b) is a sectional view taken along the line BB of FIG. 1 (a).

2 (a) is a plan view showing another embodiment of the shoe of the present invention, and FIG. 2 (b) is a sectional view taken along the line BB of FIG. 2 (a).

FIG. 3 is a cross-sectional view showing another embodiment of the shoe of the present invention.

[Explanation of symbols]

 1,4,7 Shoes 2,5 Insole 3,6 Polymer blend material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichiro Wakana 3-5-5 Ogawa Higashimachi, Kodaira-shi, Tokyo (72) Inventor Miei Fukahori 2-9-7 Sanada-cho, Hachioji-shi, Tokyo

Claims (1)

[Claims] 1. A shoe having a shock absorbing material,
The impact absorbing material is a polymer blend material containing a high molecular weight organic material and a low molecular weight material as main components, and the content ratio of the high molecular weight organic material is lower than the content ratio of the low molecular weight material. A shoe made of a polymer blend material having a three-dimensional continuous network skeleton structure.