JP2916369B2 - Shoe sole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe sole reinforced by replacing at least a part of the sole with a fiber-reinforced resin sheet.

[0002]

2. Description of the Related Art Conventionally, various reinforcing materials have been used for shoe soles. For example, a woven fabric or mat made of carbon fiber is formed into a sheet with a thermosetting resin such as an epoxy resin, a polyester resin or a phenol resin. A shoe sole in which a reinforcing material made of a fiber reinforced plastic sheet is incorporated in the shoe sole or bonded to an appropriate place with an adhesive or the like is used.

However, since the fiber-reinforced plastic sheet has a higher flexural modulus than urethane resin or polyamide resin used for the sole of the shoe sole, it inhibits the flexibility of the shoe sole and causes repeated bending. There was a drawback that the fiber-reinforced plastic material was easily deformed and easily peeled off from the shoe sole.

Various proposals have been made as means for improving the compatibility between the outsole and the fiber-reinforced resin sheet (for example, Japanese Utility Model Laid-Open No. Sho 62-119804), but the shoe sole and the fiber reinforced due to severe bending are still in use. The problem of interface delamination with the resin sheet has not been completely solved.

[0005]

SUMMARY OF THE INVENTION The present inventors changed the types of resins used for the outsole and the fiber-reinforced resin sheet in various ways and conducted tests such as peel strength. The inventors have found that the combination greatly improves the problem of interfacial delamination, and have made the present invention.

[0006]

That is, the present invention relates to a shoe sole reinforced by replacing at least a part of the sole with a fiber-reinforced resin sheet, wherein the sole is made of polyurethane resin or polyamide resin, A shoe sole characterized in that the reinforced resin sheet comprises a fiber layer and a resin layer made of a mixture of a polyamide resin and a polyolefin resin.

[0007]

[0008] The fiber layer constituting the fiber reinforced resin sheet of the present invention may be woven long fibers, or may be short fibers dispersed in a resin matrix. When a material in which short fibers are dispersed in a resin matrix is used as the fiber layer, the material of the resin matrix is preferably the same as the material of the resin constituting the fiber-reinforced resin sheet, because it is easily compatible with each other and is preferable.

The fibers are carbon fibers, aromatic polyamide fibers,
Synthetic fibers or natural fibers such as aliphatic polyamide fibers, polyethylene fibers, boron fibers, polyester fibers, and acrylic fibers are used, and those subjected to an adhesive treatment are desirable. Carbon fiber is desirable in terms of strength and elastic modulus. For example, carbon fiber 5T34 commercially available from Toray Industries, Inc.
7 are mentioned.

The fiber reinforced resin sheet may be one in which the fiber layer is sandwiched between resin sheets and pressure-bonded, or may be bonded to one of the surfaces and then pressure-bonded. As the resin layer, a resin molded into a sheet or a resin nonwoven fabric is used. This resin layer is made of a mixture of a polyolefin resin and a polyamide resin, regardless of whether the bottom is made of a polyurethane resin or a polyamide resin. By selecting such a resin, the adhesiveness to the outsole is greatly improved, and the reinforcing effect of the fiber-reinforced resin sheet is sufficiently exhibited.

FIG. 1 shows a typical example of the fiber-reinforced resin sheet of the present invention. In FIG. 1, 1 indicates a fiber layer, and 2 indicates a resin layer sandwiching the fiber layer.

In the present invention, the "outsole" refers to a resin portion occupying a major part of the shoe sole, and when referring to FIG. 2, 3 and 4 together form the outsole. In the present invention, at least a part of the outsole is replaced with the above-mentioned fiber-reinforced resin sheet to reinforce the outsole and provide an excellent shoe sole. As shown in FIG. 2, the upper part of the toe portion of the outsole may be replaced with the fiber reinforced resin sheet of the present invention. Further, as shown in FIGS. 3 and 4, the central portion or the bottom portion of the outsole may be replaced with a fiber reinforced resin sheet.

There are various methods for replacing a part of the outsole with the fiber reinforced resin sheet. In general, a preformed fiber-reinforced resin sheet is inserted into a shape, and the resin of the outsole is further supplied into the mold, whereby a part of the outsole is replaced with the fiber-reinforced resin sheet (integral molding). Of course, if necessary, the outsole and the fiber reinforced resin sheet may be separately formed and then bonded by a suitable adhesive or a method such as fusion.
Generally, integral molding is preferred.

[0014]

EXAMPLES The present invention will be described in more detail with reference to Examples. The present invention is not limited to these examples.

Examples 1 and 2 and Comparative Examples 1 to 13 The materials of the resin layers used in Examples and Comparative Examples are shown below. Abbreviations described in Table 1 are used in the examples.

[0016]

[Table 1]

The solvent resistance test of these resins was conducted using toluene 4
It was measured by the weight change rate after immersion at 0 ° C. for 24 hours. As for the solvent resistance, since the outsole is fixed to the upper part of the shoe with an adhesive, the test is for a solvent such as toluene in the adhesive, and a solvent having low solvent resistance cannot be used.

First, as shown in FIG. 1, a fiber-reinforced resin sheet is formed by molding a reinforcing fiber in which a resin layer is sandwiched between the resin layers, and a polyurethane or polyamide (nylon 12) is formed by molding the sheet. As a result, a material in which the outsole was replaced as shown in FIG. 2 was formed.
The outsole was combined with the upper part of a general athletic shoe to produce an athletic shoe.

The resulting shoes were subjected to a peel strength test and a bending fatigue test. Peeling strength test: shoe sole 25mm x 100
The sheet was punched into a mm, and subjected to a peel strength test according to the method of JIS K6301. The higher the numerical value obtained, the better the peel strength. Flexural Fatigue Test: The resulting shoe is repeatedly bent and turned back to 90 °, checked every 10,000 times and the number of times until delamination occurs is listed in Table 2.

[0020]

[Table 2]

[0021]

According to the present invention, the adhesion between the fiber reinforced resin sheet and the resin at the outsole is very good, and the fiber reinforced resin sheet easily follows the movement of the outsole. Peeling is less likely to occur. Further, since the resin of the fiber reinforced resin sheet used in the present invention has a functional group having high functionality, it is considered that the adhesiveness is greatly improved by some chemical action with the outsole.

In the present invention, since the boundary surface of the fiber reinforced resin with the outsole is completely adhered, even if it is excessively bent, it does not peel off, and is excellent in elasticity, bending fatigue and durability. .
The shoe sole of the present invention has a great effect on preventing deformation of shoes. In addition, due to the effect of the fiber reinforced resin sheet, a thinner shoe sole can be used more sufficiently than a conventional shoe sole having a thicker thickness, so that a thin and lightweight shoe sole can be provided.

The sole of the present invention can be used for various sports and athletic shoes, and in particular, shoes with spikes and points, such as golf, baseball, soccer, and rugby, can provide shoes without a feeling of thrust. .

Further, when the sole of the outsole is replaced with a fiber reinforced resin sheet, the contrast between the fiber reinforced resin sheet to be used and the outsole is clarified, so that a shoe sole with excellent appearance can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a fiber reinforced resin sheet used in the present invention.

FIG. 2 is a view showing an example of shoes obtained by the present invention.

FIG. 3 is a schematic sectional view of an example of the shoe sole of the present invention.

FIG. 4 is a schematic sectional view of another example of the shoe sole of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... fiber layer, 2 ... resin layer, 3 ... fiber reinforced resin sheet, 4
... the outsole.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A43B 13/12 B32B 27/34 B32B 27/40 B32B 27/12 B32B 27/32

Claims (1)

(57) [Claims] 1. A shoe sole reinforced by replacing at least a part of the outsole with a fiber reinforced resin sheet, wherein the outsole is made of a polyurethane resin or a polyamide resin, and the fiber reinforced resin sheet is made of a fiber layer and a polyamide. A shoe sole comprising a resin layer made of a mixture of a resin and a polyolefin resin.