JPH0417042B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a footwear covering material, and particularly to a footwear covering material having excellent breathability and good adhesive strength. Cloth coverings for footwear, such as those used for athletic shoes, are generally made of two pieces of cloth, an outer fabric and a lining fabric, bonded together using an adhesive so that they can withstand long-term use. things are used. In this case, lamination is performed using rubber-based adhesives such as natural rubber adhesives and synthetic rubber adhesives, mainly due to adhesive properties or cost considerations. The manufacturing process for adhesives is relatively complex, and the adhesive itself is expensive. Furthermore, it is necessary to use organic solvents to bond the lining and outer fabrics, which poses the risk of fire or the work environment. However, problems such as deterioration of the temperature and the like arose, and this was not necessarily desirable. In addition, when wearing athletic shoes or jogging shoes for long periods of time, feet become stuffy, and although breathability is required to prevent this, shoes made with rubber adhesives In the past, problems such as poor ventilation also occurred. In recent years, methods have been proposed in which the lining fabric and the outer fabric are bonded together using hot melt adhesives made of polyurethane or synthetic resins such as ethylene vinyl acetate instead of rubber adhesives, but even in this case, the adhesive At the stage of hardening, the cover lacks flexibility, resulting in poor texture and poor breathability, and the problem is that the adhesive strength between the lining fabric and the outer fabric decreases significantly after washing. Ta. In order to make the coverlet breathable, it has been considered that the lining and outer fabrics are bonded at spots instead of the entire surface, but it is still difficult to obtain a coverlet with excellent adhesive properties. The current situation was long. The present inventors conducted studies to solve the problems of the conventional footwear covering materials described above, and found that a nylon-based polyamide copolymer is suitable as a hot melt adhesive for bonding lining fabrics and outer fabrics. The present invention was completed based on the new discovery that it exhibits adhesive properties and maintains the breathability of the cover. That is, in the present invention, the lining fabric and the outer fabric contain 10 to 40% by weight of a polyamide polymer represented by the following formula: -[(CH ₂ )nCONH-] (where n is 10 or 11) , 10 to 40% by weight of a polyamide polymer of the formula _: −[(CH ₂ ) ₅ CONH−] (), and _the following formula: ₋ ) (where m is 5, 6, 7, 8, 9, 10 or 11) as a copolymer unit, and has a melting point of 80 to 160
This is a shoe covering material for footwear made by thermally adhering powder of polyamide copolymer at ℃. The footwear material of the present invention is made by thermally adhering the lining fabric and the outer fabric with powder of a specific polyamide copolymer as described above. Regarding the fabrics used as the outer fabric and the lining fabric, There is no particular limitation, but cotton,
Examples include natural fibers such as cotton and hemp, artificial fibers such as viscose and rayon, synthetic fibers such as polyester, and blended fibers thereof. When thermally bonding such lining fabric and outer fabric with adhesive, thermocompression bonding (hot press bonding) is usually used at a temperature range of 100℃ to 190℃ to prevent these fabrics from becoming brittle due to heat. ), the melting point of the polyamide copolymer used as the adhesive is 80
It is desired that the temperature is about 90 to 130°C, preferably about 90 to 130°C. By the way, the melting point of nylon 12, which is a type of polyamide polymer, is about 180°C, and the melting point of nylon 6 is about 210°C. Therefore, even if it is possible to use these nylon 12 or nylon 6 alone as a hot melt adhesive, the heat setting conditions for hot pressing the lining fabric and the outer fabric are particularly limited, and they cannot be used with various fabrics. It cannot be applied to bonding. In particular, the present inventors have developed a polyamide copolymer comprising 10 to 40% by weight of a polyamide polymer represented by the formula, 10 to 40% by weight of a polyamide polymer represented by the formula, and containing copolymer units represented by other formulas. The present invention was completed by focusing on the fact that the polymer exhibits a desired melting point as a hot melt adhesive between the lining fabric and the outer fabric of a jacket. Therefore, the polyamide copolymer used as the hot melt adhesive used in the present invention specifically contains nylon 11 and/or nylon 12 corresponding to the formula as monomer units constituting the copolymer.
10 to 40% by weight of nylon 6, equivalent to formula
10 to 40% by weight, and also contains a copolymer unit represented by the formula, for example, a terpolymer,
It may be a quaternary polymer. Examples of these polyamide copolymers are shown below. Nylon 6/66/12, Nylon 6/69/12, Nylon 6/610/12, Nylon 6/612/12, Nylon 6/66/11, Nylon 6/66/69/12, Nylon 6/66/610 /12, nylon 6/66/612/
12, nylon 6/66/11/12, nylon 6/
610/11/12 etc. The blending weight ratio of the above-mentioned polyamide copolymers is selected so that the number average molecular weight is 8,000 to 18,000, but preferably the number average molecular weight is 10,000 to 15,000. When having this number average molecular weight, the polyamide copolymer has a melting point of 80 to 160°C, preferably 90 to 130°C.
It has a temperature range of ℃. In addition, the number average molecular weight of the polyamide copolymer is
It was calculated by determining the ratio of -NH ₂ and -COOH in the copolymer terminal group, and the melting point was measured by DSC at a temperature increase rate of 16°C/min. Next, a method for manufacturing the footwear material of the present invention will be described. Specifically, the footwear material of the present invention, that is, the footwear is manufactured as follows. That is, powder of polyamide copolymer, which is the hot melt adhesive used in the present invention, is sprinkled on the backing fabric at approximately equal intervals, and the temperature is about 20 to
It is possible to obtain a cover by heating to a temperature 30°C higher to melt only the surface, then placing an outer cloth on top of this, and cooling after pressing. In this case, the particle size of the copolymer powder used is
The average particle diameter can be selected from a range of about 0.1 to 500μ, although it cannot be absolutely limited depending on the type of backing fabric or outer fabric used, and is preferably about 50μ to 250μ. In addition, when scattering polyamide copolymer powder on cloth, there are methods of scattering the powder itself,
That is, a powder dot method or a method of applying a dispersion in which powder is dispersed in a solvent such as water, that is, a paste dot method can be used. Although the polyamide copolymer powder is sprinkled on the lining fabric according to the above-mentioned manufacturing method, it is not necessarily necessary to scatter it only on the lining fabric; it is sprinkled on the outer fabric, treated in the same way, and It may also be a means for placing and pressing the cloth. The cover according to the present invention is one in which a backing fabric and an outer fabric are bonded together using powdered polyamide copolymer hot-melt adhesive; however, in this bonding process, the adhesive is heated 20 to 30°C higher than the melting point of the powder. , only the surface of the powder is melted, and then both fabrics are pressed together in a bonded state, so that the molten powder anchors the fabric fibers to entangle them, maintaining firm adhesion as well as breathability. This will cause it to sag. In addition, the lamination temperature is usually 120°C to 160°C,
In addition, since the pressure is applied at a temperature of about 1 to 2 minutes, the texture of the outer fabric or lining fabric used will not be lost, and no disadvantages such as embrittlement will occur. The present invention will be explained in more detail below with reference to Examples. Example 1 A viscose rayon cloth was used as the backing cloth, and on the top surface was coated a copolymer powder (melting point 115) of nylon 6/612/12 (copolymerization ratio 30/30/40) with a particle size of 250μ.
℃, number average molecular weight 13000) was sprayed at approximately equal intervals in an amount of 50 g/m ² using a powder dot method. Next, it was passed through a hot air tank of a coating machine at 150° C. for 2 minutes, and at the end of the machine, a cotton cloth was layered as an outer fabric, pressed at a pressure of 5 kg/m ² , and allowed to cool to obtain a coat. Example 2 A coat was obtained in the same manner as in Example 1, except that the copolymer powder was dispersed in water and applied on a backing cloth using a paste dot method. The coats obtained in Examples 1 and 2 as described above were tested for adhesion, air permeability, texture, discoloration, etc. In addition, the following was used as a comparative example. Comparative Example 1 A jacket obtained by using the same outer fabric and lining fabric as those used in the examples of the present invention, and laminating the entire surface with natural rubber adhesive (700 g/m ² ) as an adhesive. Comparative Example 2 A jacket made of the same outer fabric and lining fabric as those used in the examples of the present invention, and the entire surface of which was laminated with a polyurethane hot melt adhesive (350 g/m ² ). Comparative Example 3 A jacket made of the same outer and lining fabrics as used in the examples of the invention and laminated with ethylene vinyl acetate blend (50 g/m ² ) powder as adhesive. The results are shown in the table below.

[Table] Note: Washing was carried out three times using a commercially available synthetic detergent in a regular electric washing machine.
As is clear from the results in the table above, the footwear covering material of the present invention has superior adhesive strength during normal use and after washing, as well as superior breathability and texture, compared to the comparative example. It turns out that it is good and has no color fastness. Therefore, it can be said that it is particularly superior compared to conventional cloaks.

Claims (1)

[Scope of Claims] 1. The backing fabric and the outer fabric are made of 10 to 40 polyamide polymers represented by the following formula: −[(CH ₂ )nCONH−] () (where n is 10 or 11) 10 to 40% by weight of a polyamide polymer of the formula: −[(CH ₂ ) ₅ CONH−] ( ) and the following formula: −[NH(CH ₂ ) ₆ NHCO(CH ₂ ) mCO− ] A polymer represented by () (in the formula, m is 5, 6, 7, 8, 9, 10 or 11), which contains as a copolymer unit and has a melting point of 80 to 160
1. A shoe covering material for footwear, characterized in that it is made by thermally adhering a polyamide copolymer having a temperature of .degree.