JP2002272501A - Injection molded shoes using shoe upper made of polypropylene - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide injection molded shoes which are formed by using materials of a non-chlorine system, for uppers and soles and have the excellent adhesive strength between the soles and the uppers. SOLUTION: The shoes are formed by using woven fabrics made of cotton or synthetic fibers containing >=40% polypropylene resin or synthetic leather containing >=40% polyolefin resin as the uppers and integrally molding the soles consisting essentially of a hydrogenated styrene-isoprene-styrene block copolymer by injection molding to the uppers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe cover of an injection-molded shoe using a chlorine-free thermoplastic elastomer for a shoe sole.

[0002]

2. Description of the Related Art In recent years, non-chlorine thermoplastic elastomers, which have rubber elasticity and do not require a vulcanization step, have attracted attention as shoe sole materials for footwear. Among such non-chlorine thermoplastic elastomers, hydrogenated styrene-isoprene-
Styrene block copolymer resin (referred to as SEPS copolymer resin) is rich in flexibility, mechanical strength, heat resistance, weather resistance,
Suitable for shoe soles due to its excellent oil resistance and moldability. The SEPS copolymer resin is also referred to as a styrene-ethylene-propylene-styrene block copolymer resin.

[0003] However, a sole material mainly composed of a SEPS copolymer resin has a problem in adhesiveness to a shoe upper during injection molding. That is, a shoe sole material containing a SEPS copolymer resin as a main component has a low adhesive strength to cotton or synthetic fiber woven fabric generally used as a shoe upper during injection molding. In particular, the adhesive strength to synthetic leather such as PU and PVC is extremely low, so that it cannot be used for a saddle of a shoe upper, a decorative part, or the like, which is bonded to a shoe sole. There is a problem of adhesion such that general synthetic leather cannot be used as a saddle of a shoe upper, a decorative part, or the like in a portion that is bonded to a shoe sole.

[0004] The design of shoes using a chlorine-free thermoplastic elastomer as a sole material is limited to a woven fabric made of cotton or synthetic fiber, etc., in a portion related to the adhesion to the sole, and the design is generally a cloth. Only shoes are manufactured. There was also a design problem in that casual non-chlorine shoes that prioritized design were not manufactured.

[0005]

The shoe of the present invention is a shoe using a non-chlorine-based material, in which a sole material mainly composed of a SEPS copolymer resin is used to improve the adhesion to a shoe upper cover. The purpose is to manufacture shoes.

[0006]

Means for Solving the Problems The shoe cover is formed on a woven, knitted or nonwoven fabric or a skin layer in which the mixing ratio of polypropylene resin fibers (referred to as PP resin fibers) is 40% by volume or more. A polyolefin synthetic leather containing 40% by volume or more of a polypropylene resin (referred to as a PP resin), characterized by a shoe in which a shoe sole material mainly composed of a SEPS copolymer resin is injection-molded on the shoe upper. In the composition of the shoe upper cover, if the mixing ratio of the polypropylene resin fiber or the polypropylene resin is 40% by volume or more, the adhesiveness to the sole material mainly composed of the SEPS copolymer resin is good. If it is less than 40% by volume, the adhesion is reduced.

[0007] The sole material is made of SEPS copolymer resin and PP.
The mixing ratio with the resin is 100 parts by weight: 20 to 80 parts by weight, and the flow rate measured with a vertical flow tester having a die diameter of 1 mm and a die length of 2 mm at a temperature of 200 ° C. and a load of 10 kg is 0. The shoe according to claim 1, characterized in that the rate is 1 to 3.0 ml / sec.

[0008] The sole material of the present invention provides a shoe with a clear design, no lack of design, and good adhesion to the shoe upper cover if the composition and fluidity are set to the above conditions. Obtainable. When the mixing ratio of the SEPS copolymer resin and the PP resin is 100 parts by weight: 20 to 80 parts by weight is best, and when the mixing ratio with the PP resin is less than 20 parts by weight, the moldability and the adhesion to the shoe upper deteriorate. When the weight exceeds 80 parts by weight, the flexibility of the sole is lost.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The shoe cap used in the shoes of the present invention is a woven or knitted fabric or a nonwoven fabric having a mixing ratio of PP resin fibers of 40% by volume or more, or a PP resin in a skin layer. Synthetic leather containing 40% by volume or more can be used.

[0010] As the fiber to be blended with the PP resin fiber,
Using chemical fiber such as cotton, nylon, polyester, etc., PP
A woven fabric, a knitted fabric, a nonwoven fabric or the like for a shoe upper is manufactured by varying the mixing ratio of the resin fibers. As a synthetic leather containing a PP resin in a skin layer of 40% by volume or more, a mixing ratio of a PP resin to a polyolefin-based resin such as an ethylene vinyl acetate copolymer resin (referred to as EVA resin) is varied to obtain a leather cover. Manufactures synthetic leather.

[0011] As a woven shoe upper covering material, cotton (Ponji 1) is used.
No. 4 bleaching) PP resin fiber mixing ratio 30% by volume, 40
Using each of the woven fabrics of volume%, 50 volume%, 60 volume%, and 80 volume% and the woven fabric made of only the PP resin fiber, it is laminated with a cotton cloth (Shoaya 65) with rubber glue. After cutting into each part of the shoe upper cover shape, sewing is performed to obtain a shoe upper cover. As the synthetic leather shoe upper covering material, the mixing ratio of PP resin to EVA resin in the skin layer is 30% by volume, 40% by volume, 50% by volume,
Synthetic leather of 60% by volume and 80% by volume and synthetic leather of only PP resin are cut into respective portions of the shape of the shoe upper cover and then sewn to obtain a shoe upper cover.

Each of the above-mentioned shoe uppers is suspended in the last mold. The last in which the shoecap is hung, the side mold, and the sole mold are combined to form at least a sole-forming hollow part, and a mixture of SEPS copolymer resin and PP resin is mainly used in the sole-forming hollow part. The shoe sole material as the component is injected, and the shoe sole and the shoe upper are integrated to obtain a shoe. The composition of the sole at this time is as described in Table 1, and the fluidity of the sole material was measured at a temperature of 200 ° C. and a load of 10 kg using a high-grade flow tester having a die diameter of 1 mm and a die length of 2 mm. The flow rate obtained was 0.82 ml / sec.

The adhesive strength between the shoe sole and the shoe upper after the injection molding was as shown in Tables 2 and 3. In the shoe obtained by the present invention, both the shoe sole and the shoe upper cover are made of a chlorine-free material, so that environmentally friendly casual shoes can be manufactured. The composition of the injection-molded shoe sole is shown in Table 1 below.
One day after the shoe was manufactured, the adhesive strength between the sole and the shoe upper was measured by JI.
Tables 2 and 3 show the results measured by S-K6256.

[0014]

[Table 1]

Here, the following components were used as the components * 1 to * 4 in Table 1. * 1) SEPS copolymer resin: Trade name: Septon 405
5. Manufacturing company name: Kuraray Co., Ltd., styrene content: 30
% By weight, isoprene content: 70% by weight, weight average molecular weight: 260,000, hydrogenation rate: 90% or more * 2) PP resin: polypropylene melt viscosity: 0.21 m
1 / sec * 3) Paraffin oil: Trade name: Diana Process Oil PW-90, manufactured Company name: manufactured by Idemitsu Petrochemical Co., weight average molecular weight: 540,
Content of aromatic component: 0.1% or less * 4) Antioxidant: trade name: PEP-36, manufacturer:
Asahi Denka Co., Ltd.

[0016]

[Table 2]

[0017]

[Table 3]

The adhesive force between the shoe upper and the sole is practically 1.5K.
N / m or more is required. The shoes of the present invention have a
If a woven fabric or a shoe upper covering 40% by volume of P resin fiber or synthetic leather in which 40% by volume of PP resin is mixed with EVA resin is used, a practically good adhesive force of 1.5KN / m or more is obtained. Was obtained.

[0019]

When a woven fabric or a synthetic leather containing at least 40% of a polypropylene resin is used for a shoe upper, the portion of the shoe sole that adheres to the shoe sole is bonded to the shoe sole mainly composed of SEPS copolymer resin. good. Therefore, in shoes using all non-chlorine-based materials, it is possible to manufacture casual shoes giving priority to design.

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Claims (2)

[Claims] 1. The shoecap is made of a woven, knitted, or nonwoven fabric having a mixing ratio of polypropylene resin fibers of 40% by volume or more, or a polyolefin-based material containing 40% by volume or more of a polypropylene resin in a skin layer. A shoe made of resin synthetic leather, wherein a shoe sole material containing hydrogenated styrene-isoprene-styrene block copolymer resin as a main component is injection-molded on the shoe cap. 2. The shoe sole material has a mixing ratio of a hydrogenated styrene-isoprene-styrene block copolymer resin and a polypropylene resin of 100 parts by weight: 20 to 80 parts by weight, a die diameter of 1 mm, and a die length of 2 mm. 2. The shoe according to claim 1, wherein a flow rate measured by a height-type flow tester at a temperature of 200 ° C. and a load of 10 kg is 0.1 to 3.0 ml / sec.