JPS60207603A - Upper material of footwear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shoe covering material for footwear, which has excellent breathability and good adhesive strength.

Lace coverings for footwear, such as those used for athletic shoes, are generally made by bonding two pieces of cloth, a outer fabric and a lining fabric, using an adhesive so that they can withstand long-term use. things are used.

In this case, the bonding method is mainly performed using rubber adhesives such as natural rubber adhesives, synthetic rubber adhesives, etc. from the viewpoint of adhesiveness or cost. The manufacturing process for adhesives is relatively complicated, the adhesive itself is expensive, and furthermore, organic solvents are used to bond the material and the outer fabric. Problems such as lack of necessity, risk of fire, and sensitization of the working environment have arisen, and this has not necessarily been desirable.

In addition, when wearing athletic shoes or jogging shoes for long periods of time, feet may become stuffy, and although breathability is required to prevent this, rubber-based adhesives are not suitable for wearing shoes. This also caused problems such as poor ventilation.

In recent years, polyurethane 1&1 has replaced rubber adhesives!
Alternatively, a method has been proposed in which the lining fabric and the outer fabric are bonded together using a hot-melt adhesive made of synthetic resin such as ethylene vinyl acetate, but even in this case, the flexibility of the lining fabric remains after the adhesive has hardened. It may cause chipping and the texture will deteriorate.
In addition, there were problems in that the air permeability was poor, and the adhesive strength between the layer fabric and the outer fabric decreased significantly after washing.

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 has not yet been possible to obtain a coverlet with excellent adhesive properties. The current situation was that there was no such thing.

The present inventors conducted studies to solve the problems of the conventional footwear covering materials mentioned above, and found that a nylon-based polyamide copolymer is suitable as a hot melt adhesive for laminating lining fabrics and outer fabrics. They newly discovered that the material exhibits excellent adhesion and maintains the breathability of the cover, and completed the present invention.

That is, in the present invention, the lining fabric and the outer fabric are made of a polyamide polymer represented by the following formula I: CH(CH,)ncONH-]-(11, where n is 10 or 11) by weight of 10 to 40%. %
, 10 to 40% by weight of an amide polymer expressed by the following formula ■ Ni E-(C), C0NH-1-, and the following formula m: 1,000 NH (CH,), NHCO (CH,) mCO-)-(
[1) (where m is 5.6.7.8.9.10 or 11
A polymer represented by
This is a shoe covering material for footwear made of a polyamide copolymer, which is thermally bonded with powder.

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,
Although not particularly limited, examples include natural fibers such as cotton, cotton, and linen, artificial fibers such as viscose and rayon, synthetic fibers such as polyester, and blended fibers thereof.

When thermally bonding such lining and outer fabrics with adhesive, thermocompression bonding (hot press bonding) is usually performed at a temperature range of 100°C to 190'C to prevent the canvas from becoming brittle due to heat. ), it is desirable that the melting point of the polyamide copolymer used as the adhesive is about 80 to 160°C, preferably about 9 to 150°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, these nylon 1
Even if it is possible to use λ or nylon 6 alone as a hot melt adhesive, the heat setting conditions for hot pressing between the lining fabric and the outer fabric will be limited to It cannot be applied to combinations.

In particular, the present inventors found that the polyamide polymer represented by formula (1) contains 10 to 40% by weight, the polyamide polymer represented by formula (2) contains 10 to 40% by weight, and other copolymer units represented by (2) The present invention was completed based on the fact that the polyamide copolymer containing the above-mentioned polyamide copolymer 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 has the following formula as a monomer unit constituting the copolymer: Nylon 1 equivalent to
1 and 1 or 10 to 40% by weight of nylon 12,
It may be a terpolymer or a quaternary polymer containing 10 to 40% by weight of nylon 6 corresponding to formula (2) and a copolymer unit represented by (2) in addition to this. 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 6/6
6/69/12. Nylon 6/66/610/12.
Nylon 6/66/612/12. Nylon 6/6
6/11/12, nylon 6/61 o
/11/12 etc.

The blending weight ratio of each of the nine polyamide copolymers described above is selected so that the number average molecular weight is from a00 to 1111.000, but preferably the number average molecular weight is from 10,000 to 15,000. be. 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 'C.

The number average molecular weight of the polyamide copolymer was calculated based on the ratio of -NH and 1000H in the copolymer end groups, and the melting point was determined by DSC at a heating rate of 16°C/min. It was measured using

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 heated to a temperature approximately 20 to 60°C higher than the melting point of the copolymer powder used. Then, only the surface is melted, and then an outer cloth is placed on this, and after being pressed, it is cooled to obtain a cover.

In this case, the particle size of the copolymer powder used cannot be absolutely limited depending on the type of lining fabric or outer fabric used, but it can be selected from a range of approximately α1 to 500 μ as an average particle size. However, it is preferably about 50μ to 250μ.

In addition, when spraying polyamide copolymer powder onto fabric, there are two methods: spreading the powder itself, that is, the powder dot method, or applying a dispersion of the powder in a solvent such as water, that is, the paste dot method. It can be carried out.

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 suppressing the cloth.

The cover according to the present invention uses hot-melt adhesive powder of polyamide copolymer to bond the lining fabric and the outer fabric! 7. In this process, the powder is heated 20 to 30°C higher than the melting point of the powder, so only the surface of the powder melts, and then the canvas is pressed while the powder is in a molten state. The powder intertwines between the fabric fibers, maintaining firm adhesion and maintaining breathability.

In addition, since the lamination temperature is usually 120'C to 160'C and the temperature is suppressed for about 1 to 2 minutes, the texture of the outer fabric or lining fabric used will not be lost and there will be no risk of embrittlement. There will be no disadvantage whatsoever.

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 its upper surface was coated with nylon 6/612/12 (copolymerization ratio 3) with a particle size of 250μ.
0150/40) copolymer powder (melting point 115°C
, number average molecular weight 1 to ooo) was dispersed at approximately equal intervals in an amount of 50 f/rn'' 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 kp/in 2 , and allowed to cool to obtain a coat.

Example 2: Dispersing the copolymer powder of Example 1 above in water,
A coat was obtained in the same manner except that the paste was applied onto the backing cloth.

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: The same outer fabric and lining fabric as those used in the examples of the present invention were used, and natural rubber adhesive (700
A cover obtained by laminating the entire surface with S'/m").

Comparative Example 2: Using the same outer cloth and cloth as those used in the examples of the present invention, the entire surface was laminated with a polyurethane hot melt adhesive (35097 m2) as an adhesive.

Comparative Example 3: A jacket made using the same outer and lining fabrics as used in the examples of the invention and laminated with ethylene vinyl acetate blend (5097 m'') powder as adhesive.

The results are shown in the table below.

Note: Washing was carried out three times using a commercially available synthetic detergent in an ordinary 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. in good condition,
It turns out that it also has no color fastness.

Therefore, it can be said that it is particularly superior compared to conventional cloaks.

Patent applicant Achilles Corporation Daicel Chemical Industries, Ltd.

Claims (1)

[Claims] (1) The lining fabric and the outer fabric are expressed by the following formula I knee (-(Cj(,)ncONH± +11 (in the formula, n is 1
0 or 11) by weight, 10 to 40 weights of a polyamide polymer of the following formula m: 1,000NH(CH,)sNHco(OH1)rnco +(
A polymer represented by [111 (in the formula, m is 5.6.7.
A shoe covering material for footwear characterized by being thermally bonded with powder of a polyamide copolymer.