JPH0443046Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to the improvement of synthetic resin soles (hereinafter abbreviated as soles) used for shoes for golf, baseball, soccer, track and field, etc. (Prior Art) Regarding conventional shoe soles, taking golf shoes as an example, it is well known that the soles of golf shoes are generally molded from synthetic resin in order to maintain water resistance and abrasion resistance. . In other words, the sole body is molded using synthetic resin such as nylon 11 or nylon 12 polyamide resin or polyurethane resin with good abrasion resistance, or the sole is made of the same synthetic resin in different colors. So-called two-color molded soles, etc., in which the main body and the sole reinforcing member are integrally molded, are known. (Problems to be solved by the invention) However, these golf shoes had the following problems. In other words, in the former type of sole made of polyamide resin, the specific gravity of the polyamide resin itself is small, so the weight of the sole is reduced, which can prevent foot fatigue to some extent when wearing the shoe.
Since polyamide resin has poor abrasion resistance, it has the disadvantage of poor durability. Furthermore, when the temperature drops, such as in winter, the physical properties of the polyamide resin become hard and the bending elastic modulus becomes extremely high, resulting in a problem in that the flexibility of the sole deteriorates. On the other hand, in the case of the latter polyurethane resin, it has very good abrasion resistance and can provide durable golf shoes, and also has good low-temperature properties, so even when used in winter, it is as hard as polyamide resin. The flexibility of the sole was also good. On the other hand, since the specific gravity of the polyurethane resin is high, the weight of the golf shoes is also high, and the feet tend to get tired when wearing them. Therefore, it has been possible to mold shoe soles by combining different materials, taking advantage of the low specific gravity of polyamide resin and the good abrasion resistance and low-temperature properties of polyurethane resin. Although attempts were made, the adhesion between the two was poor, and as a result of repeated bending tests and peel tests, the peel strength was weak, and commercialization was not realized. Therefore, even today, the soles of two-color molded shoes are
The problem was that it was only possible to mold the same materials, such as polyamide resin and polyamide resin, or polyurethane resin and polyurethane resin. In view of the above, it has been desired to provide a shoe sole that is lightweight, wear-resistant, and has good low-temperature properties by combining these different materials to exhibit their respective characteristics. (Means for Solving the Problems) In the present invention, as a result of various experiments, a shoe sole having the following structure has been discovered, which has better characteristics than ever before. That is, it is made by injection molding of different materials, characterized in that the parts that require a certain degree of abrasion resistance are formed of thermoplastic polyurethane resin members, and the parts that require some degree of rigidity are formed of thermoplastic polyether blockamide resin members. The sole is made of synthetic resin. (Function) The present invention has the above-mentioned structure, that is, by using a thermoplastic polyurethane resin and a thermoplastic polyether blockamide resin, it can produce resins that could not be produced with conventional polyamide resins and polyurethane resins. It is possible to improve the adhesion between the two, and the adhesion between the two is significantly improved. Furthermore, in areas where a certain degree of abrasion resistance is required, such as golf shoes, thermoplastic polyurethane resin members are placed around the toe area and the rear edge of the heel, and other areas are made with low specific gravity and spring properties. By forming the golf shoe with an excellent thermoplastic polyether block amide resin material, the golf shoe is lightweight and has excellent abrasion resistance and durability. In addition, thermoplastic polyether block amide resin has good low-temperature properties, so it has excellent cold resistance, and its bending elastic modulus is lower than that of conventional polyamide resin, even in winter, so the flexibility of shoe soles is improved. It will be good. (Embodiment) If the present invention is explained based on the sole of a golf shoe as an embodiment, as shown in FIGS. The toe area, which is a part that requires wear resistance, is made of a thermoplastic polyurethane resin member 2, and the sole body, which is a part that requires rigidity, is made of a thermoplastic polyether blockamide resin member 3. This is a synthetic resin shoe sole 1 made of integral injection molding of different materials. Regarding the thermoplastic polyether blockamide resin member 3, it is also possible to use the thermoplastic polyether blockamide resin alone as the main component, or to further reduce the adhesion with the thermoplastic polyurethane resin and other properties. To the extent possible, polyamide resins, polyurethane resins, and other synthetic resins having good compatibility with the thermoplastic polyether blockamide resin may be mixed and used. Note that the thermoplastic polyurethane resin member 2 and the thermoplastic polyurethane resin member 3
As shown in Figure 2, the method of joining is as follows:
By making each member uneven and providing a contact piece 2' on the thermoplastic polyurethane resin member 2 side,
The adhesion of the joint can be further improved.
Furthermore, as shown in FIGS. 3 and 4, it is also possible to join and integrate both members flush. Although not shown in the drawings, other components can be joined and integrated in an appropriate form. In addition, as another embodiment of the present invention, as shown in FIGS. 5 to 7, for example, the sole 1 of a golf shoe
The toe area 5 or the stepping area 6 and the heel area 7 or the heel rear end area 8 of the sole 1 are formed of a thermoplastic polyurethane resin member 2 as shown in FIG. The sole body 1 can also be formed from the resin member 3. With this configuration, golf shoes that are lightweight and have good wear resistance and cold resistance can be provided. Furthermore, as another embodiment of the present invention, as shown in FIG. 8, in a sole 11 of a soccer shoe, for example, a stud 12 and a sole body 4 are formed from a thermoplastic polyurethane resin member 2, and the reinforcing member is heated. It can also be formed from a plastic polyether block amide resin member 3. With such a configuration, it is possible to provide soccer shoes that have good abrasion resistance and cold resistance, are lightweight, and are resistant to fatigue. Furthermore, as another embodiment of the present invention, as shown in FIG. 9, in the sole 14 of a track shoe, for example, a reinforcing member 13 for holding a nut or a reinforcing member 13 for an insert is made of a thermoplastic polyether blockamide resin member 3. It is also possible to form the reinforcing member 13 and form the sole body 4 from the thermoplastic polyurethane resin member 2. With this configuration, the thermoplastic polyether block amide resin exhibits excellent nut retention properties,
This improves the holding strength of the spike pins and improves the safety and durability of the shoe itself. Moreover, it is possible to supply track and field shoes with excellent abrasion resistance due to the thermoplastic polyurethane resin member. Although not shown in the drawings, as track shoes, it is possible to use not only the shoes with the entire sole integrated as described above, but also shoes with a combination of a front sole and a rear sole made of sharkskin. . Although not shown in the drawings, it is also possible, for example, to form the sole body including the nut holding portion from a thermoplastic polyether block amide resin member, and to form the reinforcing member from a thermoplastic polyurethane resin member. Shoes of this type can be applied to baseball shoes, soccer shoes, track shoes, golf shoes, and other shoe soles having spikes or studs. In addition to the above-mentioned embodiments, the shoe sole according to the present invention can take various forms. As an example of the present invention, as shown in Table 1, PEBAX (trademark of Toray Industries, Inc.) is used as a thermoplastic polyether blockamide resin.
and thermoplastic polyurethane resin (ether polyurethane resin and ester polyurethane resin)
The results of a comparative test are shown between a product made by injection molding of a polyamide resin and a product made by injection molding of a conventional polyamide resin and a polyurethane resin.

[Table] As can be seen from this data, it can be seen that the strength of the synthetic resin shoe sole constructed according to the present invention is superior to that of the conventional shoe sole. (Effects of the invention) As described above, unlike conventional synthetic resin shoe soles made of the same material and made of two-color molding, the present invention uses thermoplastic polyether blockamide resin and thermoplastic polyurethane resin as constituent materials. As a result, an unprecedented adhesion between the resins occurs during integral injection molding, and the adhesion between the two resins is further improved. Also, unlike the conventional shoe, in the present invention, thermoplastic polyurethane resin members are placed in each location where abrasion resistance is required, so abrasion resistance is improved and a durable shoe sole can be provided. In addition, thermoplastic polyether block amide resin members are placed in areas where rigidity is required, so the spring properties (snapiness) are good, so the sole returns quickly, making it easy to use when walking or running. Stepping in becomes sure. Furthermore, since the specific gravity of the thermoplastic polyether block amide resin is small, the weight of the sole itself can be reduced, which is highly effective in reducing foot fatigue when wearing the sole. Furthermore, since the bending elastic modulus at low temperatures is lower than that of conventional polyamide resins, it can exhibit good flexibility even at low temperatures, and has the effect of providing a good fit to the foot. As described above, the present invention can provide a shoe sole that has various effects that have not been seen before.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the sole of a golf shoe as an embodiment of the present invention, and FIG.
- A sectional view showing the cross section of part A; FIGS. 3 and 4 are sectional views showing other embodiments of the present invention; FIGS. 5 to 7 are golf shoes as an embodiment of the present invention; FIG. 8 is a plan view showing other embodiments of the sole of the shoe.
9 is a plan view showing the sole of a track shoe as an embodiment of the present invention; FIG. 9 is a plan view showing the sole of a track shoe as an embodiment of the present invention;
FIG. 0 is a sectional view taken along the line BB in FIG. 9. DESCRIPTION OF SYMBOLS 1...Synthetic resin sole, 1 ...Sole of golf shoes, 2...Thermoplastic polyurethane resin member, 2'
... contact piece, 3 ... thermoplastic polyether blockamide resin member, 4 ... sole body, 5 ... toe area, 6 ... treading part, 7 ... heel part, 8 ... heel rear end Peripheral part, 9...Matsukei groove, 10...Spike,
11... Soles of Satsuka shoes, 12... Studs,
13... Reinforcement plate, 14 ... Sole of track shoes.

Claims (1)

[Claims for Utility Model Registration] 1. In a synthetic resin shoe sole, the parts that require a certain degree of abrasion resistance are formed of thermoplastic polyurethane resin members, and the parts that require a certain degree of rigidity are formed of thermoplastic polyether blockamide resin members. A synthetic resin shoe sole made of integral injection molding of different materials. 2. The thermoplastic polyurethane resin member is disposed around the toe of the shoe sole, the tread area and heel, the rear end of the heel, or any part thereof, and the thermoplastic polyether blockamide resin member A synthetic resin shoe sole according to claim 1, wherein the sole body is formed by: 3 forming a sole body or a sole body and studs from the thermoplastic polyurethane resin member;
The synthetic resin shoe sole according to claim 1, wherein a reinforcing member is formed of the thermoplastic polyether blockamide resin member. 4. A utility model registered as claimed in claim 1, characterized in that the thermoplastic polyurethane resin member forms a reinforcing member, and the thermoplastic polyether blockamide resin member forms a sole body. Synthetic resin soles.