JPS6317978A - Hot-melt adhesive - Google Patents

Abstract

PURPOSE:The titled adhesive, consisting of a copolymer, consisting of vinyl acetate and an ethylenically unsaturated carboxylic acid in a specific proportion and having an average polymerization degree within a specific range and capable of bonding facing cloth to padding cloth so as not to slip in cutting and sewing necks, etc., of shirts. CONSTITUTION:An alkali-soluble adhesive, consisting of a copolymer of 98-85mol%, vinyl acetate and 2-15mol% ethylenically unsaturated carboxylic acid, e.g. crotonic acid, (meth)acrylic acid, etc., having 200-1,500, preferably 200-1,200 average polymerization degree and useful for padding cloth.

Description

[Detailed description of the invention] [Industrial application field] Clothing, such as blouses, shirt collars, cuffs, etc.
The trap outer material and the adhesive-applied interlining are bonded together using a hot press using an iron, etc. to prevent them from slipping, and then cut and sewn. The present invention relates to a hot melt adhesive used in that case.

[Conventional technology]

Conventionally used hot melt adhesives for interlining include nylon, polyester, polyethylene, polyvinyl chloride, and ethylene-vinyl acetate copolymer (hereinafter referred to as EVA).
Although modified EVA is insoluble in underwater detergents and has solvent resistance to dry cleaning solvents, it is difficult to remove the resin even after washing with water, detergent washing, dry cleaning, etc. after sewing, and it is difficult to remove the resin from clothing. In addition to significantly impairing the feel of the product, in the case of resins with poor dry cleaning resistance, there is a risk that oozing may occur due to half-hearted removal of the resin.

There is also a method of applying a water-bathable resin such as starch or CMC to an interlining, drying it, and then rewetting it with water or steam when adhering it to the outer material. In this case, there is a strong tendency for the resin to penetrate into the outer material and interlining, causing bleeding and impairing the texture, and a drying process is required even after application, leading to increased costs.

Furthermore, in JP-A-60-17178, the average degree of polymerization is 5.
Partially saponified polyvinyl alcohol with a saponification degree of 0 to 200 and a saponification degree of 50 to 70 mol%, and powder with an average polymerization degree of 200 to 1000, a saponification degree of 30 to 75 mol%, and a particle size of 10 to 150 mesh is disclosed in Japanese Patent Publication No. 60-54594. Modified polyvinyl alcohol containing carboxyl groups has been shown as a hot melt adhesive for interlining temporary fixing. The purpose of these products is to hot-melt the interlining material, overlap it with the outer material, press it, cut it, remove the resin by washing with water after sewing, and obtain a product that does not impair the texture of the fabric. In this case, since the resin is water-soluble, the resin fused to the interlining absorbs moisture from the atmosphere, and the interlining often blocks each other when the interlining is wound up.

To prevent blocking, add 0.0% anti-blocking agent such as calcium carbonate. Although 1 to 2 chlorides are added, it cannot be prevented during high temperature and high humidity such as in summer. For this reason, measures have been taken to prevent blocking by sandwiching polyethylene sheets between interlinings, but this results in poor productivity and economic efficiency.In addition, sufficient care must be taken in managing the resin itself and the resin-fused interlining. The disadvantage is that you have to pay for it.

[Problems to be Solved by the Invention] This invention attempts to solve the following problems of the prior art.

1. Since the resin cannot be removed even after washing or other treatments after sewing, the hardness of the resin impairs the texture of the fabric.

2. The problem of seepage caused by resins with poor cleaning resistance. 3. The problem of blocking due to moisture absorption when winding up the resin fusion interlining that occurs with water-soluble adhesives. Means] The present invention uses ♂yl acetate 98-85 lenically unsaturated carboxylic acid 2 to 15 mol%, average degree of polymerization 2
This is an alkali-soluble hot melt adhesive for interlining made of a copolymer of 00 to 1500.

A portion of vinyl acetate may be replaced with other vinyl monomers (for example, vinyl esters other than vinyl acetate, methacrylic esters, acrylic esters, etc.) within the scope of the invention. As the ethylenically unsaturated carboxylic acid, acrylic acid, methacrylic acid, crotonic acid, maleic anhydride, maleic acid monoester, itaconic acid, etc. are preferable.

Melt bonding can be done by heat pressing. Therefore, the fabric will not be damaged by heat.

Although this adhesive is insoluble in water, it becomes water-soluble in the presence of alkaline agents such as soda carbonate, caustic soda, and aqueous ammonia. Like hydrophobic resins, it has the characteristic of not removing the resin. In addition, the resin of this adhesive can be easily removed using a weakly alkaline detergent such as household detergents. As a result, bleed occurs when the resin penetrates into the outer material and interlining, which occurs with water-soluble resin adhesives, and the feel of the fabric deteriorates due to the inability to remove the resin even after washing, which occurs with EVA and nylon. There is no danger of that happening at all. Furthermore, since it is water-insoluble, the interlining to which the adhesive found in water-soluble resins is fused absorbs moisture in the atmosphere, and there is no risk of the interlinings blocking each other when the interlining is wound up.

The copolymerization ratio of the ethylenically unsaturated carboxylic acid in the alkali-soluble hot melt adhesive of the present invention is 2 to 15-1 moles, preferably 6 to 10 moles. If the ethylenically unsaturated carboxylic acid is less than 2 molar, the alkali solubility decreases,
On the other hand, if it exceeds 15 molt, although it is essentially possible, the polymerizability will be poor and the polymerization time will be long, resulting in economic disadvantages. Another disadvantage is that the copolymer film becomes hard, impairing the feel of the interlining. The degree of polymerization is within the range of 200 to 150° without causing any performance problems, but is preferably 200 to 1,200. If the degree of polymerization is less than 200, blocking occurs easily during polymerization, making it difficult to obtain the desired granular polymer. Moreover, if the degree of polymerization exceeds 1500, the melting temperature becomes high, and high temperatures are required for interlining fusing and adhesion of the adhesive, resulting in a risk of damaging workability and fabric. In addition, alkali solubility also deteriorates.

Therefore, it is desirable to partially add a degree of polymerization regulator such as carbon tetrachloride or acetaldehyde to the polymerization system to lower the degree of polymerization. Furthermore, the particle size is preferably one that passes through a 60-mesh sieve, and one that passes through a 30-mesh sieve has poor meltability and alkali solubility.

〔Example〕

The present invention will be specifically explained below with reference to production examples and examples.

Production Example 1 95 parts of vinyl acetate, 5 parts of crotonic acid, and 0 carbon tetrachloride as a degree of polymerization regulator were added to 200 parts of water in which 0.3 parts of partially saponified polyvinyl alcohol (trade name Denka Popal B-17) was dissolved as a dispersant. A solution containing 20 parts of azobisisobutyronitrile and 2 parts of azobisisobutyronitrile as a polymerization catalyst was charged into a polymerization vessel, and the polymerization temperature was maintained at 60 to 66°C to proceed with polymerization. Polymerization was stopped 5 hours after the start of polymerization, unreacted monomers were removed under reduced pressure, and a white pearl-like copolymer was obtained after filtration and drying. Table 1 shows the physical properties of the obtained copolymer.

It has good heat fusion properties and alkali solubility, and can be used as an alkali soluble hot melt adhesive.

Production Examples 2 to 9 Polymerization was performed in the same manner as in Production Example 1, with different amounts of vinyl acetate, types and amounts of ethylenically unsaturated carboxylic acids, or types and amounts of chain transfer agents. Table 1 shows the physical properties of the copolymer.

Production Examples 2 to 5 are as good as Production Example 1 and can be used as alkali-soluble hot melt adhesives.

Production Examples 6 and 7 are examples in which the amount of carboxylic acid is outside the range of the present invention, and cannot be used because a powder cannot be obtained due to poor alkali solubility and blocking during polymerization.

Production Examples 8 and 9 are examples in which the degree of polymerization is outside the range of the present invention, and powder-like products cannot be obtained due to blocking during polymerization. Furthermore, it cannot be used due to poor heat fusion properties.

The physical properties shown in Table 1 were evaluated by the following method.

Heat fusion property> Using particles between 32 and 100 meshes of the produced polymer, fabric of 1010 x 12 (Tetron/Cotton general deo
++ Spray it evenly at a rate of 159/m" on the surface (1509/m") and dry it in a dryer at a temperature of 180°C.
Heat and fuse for D seconds. After cooling naturally for 15 minutes, lightly sweep the fused surface with a brush 10 times. Then, the amount of fused polymer is measured. The thermal fusion rate is determined by the following formula.

Evaluation of heat fusion property O: Heat fusion rate 90% or more △: 1 50 coefficient or more
Add 19 particles between mesh and 99g of pure water. Next, add 0.15 y of soda carbonate and shake the shaker for 20 y.
Dissolve by shaking for 60 minutes at 20°C at a speed of 0 strokes/min and 10 cIIL/stroke. Alkali solubility is determined by the following evaluation method.

O: Polymer particles are completely dissolved.

Δ: Part of remains undissolved.

×: Not dissolved at all.

Example 1 A 32 to 100 mesh product of the polymer produced in Production Example 1 was uniformly sprinkled on a commercially available T-shirt interlining material (Tetron/Cotton - General Pro?) at a rate of 1597 m'' and dried in a dryer set at 180°C. An adhesive interlining was created by heat-sealing for 60 seconds.

Table 2 shows the performance evaluation of the adhesive strength with the outer material, the adhesive strength of the wash layer, the texture of the fabric, the seepage, and the blockiness between interlinings.

Examples 2 to 5 Adhesive interlinings were prepared from the polymers produced in Production Examples 2 to 5 in the same manner as in Example 1. Performance evaluation is shown in Table 2.

Comparative Example 1 An adhesive interlining base metal was prepared from the polymer produced in Production Example 6 in the same manner as in Example 1. Performance evaluation is shown in Table 2.

Comparative Example 2 Commercially available EV with polymerization degree of 700 and particle size of 60 to 100 mesh
A (ethylene/acetate tin'nyl-9515) An adhesive interlining base metal was prepared in the same manner as in Example 1. Performance evaluation is shown in Table 2.

Comparative Example 6 Polymerization degree 150, saponification degree 40 mol%, particle size 60-100
An adhesive interlining was prepared using mesh powder polyvinyl alcohol in the same manner as in Example 1. Performance evaluation is shown in Table 2.

Comparative Example 4 Polymerization degree 300, saponification degree 40 mol%, acid modification amount 5 mol%
An adhesive interlining base metal was prepared in the same manner as in Example 1 using maleic acid-modified polyvinyl alcohol having a particle size of 30 to 80 mesh. Performance evaluation is shown in Table 2.

The performance evaluation shown in Table 2 was performed by the following method.

Adhesive strength〉(Adhesiveness with outer material) Place the same Y-shirt fabric as the interlining on the adhesive interlining, and heat it at a temperature of 140℃.
The test pieces were heated and pressed for 10 seconds under a load of 0.3 kg/cm'' using an iron set at 0.degree.

Adhesive strength of washing layer> The test piece prepared in the adhesive strength section was cut into 10 x 12 CIl and immersed in a colorimetric tube containing 69/l household alkaline detergent (trade name Newbeads) solution 80 acetic acid tj. I let it happen. Then, set the colorimetric tube on a shaker that makes one reciprocation at 4 cIIL/stroke, and
Wash thoroughly with washing water for 5 minutes to remove detergent, and
It was dried at ℃ for 20 minutes. This test piece was cut into a width of 251iI, and the peel strength was measured, which was taken as the adhesive strength of the washing layer.

Texture of the fabric> The texture of the fabric was evaluated by touching the test pieces of the washing and drying layers prepared in the section of the adhesive strength of the washing layer.

The judgment criteria are as follows.

O: The texture of the outer material is maintained.Δ: The texture of the outer material is impaired and it becomes slightly hard.

X: 　　　　　　　 is damaged and hardened.

Combing out> The test piece of the washing and drying layer prepared in the section on the adhesion of the washing layer was 0.5'1 with an iron set at a temperature of 140℃ again.
The test piece was heated and pressed for 10 seconds under a load of 1000 yen.The test piece was visually judged to see if the adhesive resin had oozed out from the outer surface of the test piece.The criteria for judgment were as follows.

○: No oozing Δ: Slight oozing x Lots of oozing (blocking property between interlining) Place the same fabric as the interlining on the adhesive interlining, and place at 90% humidity.
A blocking test was carried out by leaving it for 24 hours under conditions of a temperature of 30° C. and a load of 1 klin''. Judgment was made based on the peel strength of the test piece of the left layer, and the interlining blocking property was evaluated.

〔Effect of the invention〕

1. After sewing, the resin can be removed by washing with an alkaline agent or weakly alkaline detergent, so the texture of the outer material can be maintained.

2. Since the resin can be completely removed by washing with an alkaline agent, there is no risk of resin seeping into the outer material.

6. When winding up the fused interlining, which is often the case with water-soluble resins, there is no problem with blocking between the interlinings due to moisture absorption, etc., because the resin of the present invention is water-insoluble.

Claims (1)

[Claims] An alkali-soluble hot melt adhesive for interlining comprising a copolymer of 98 to 85 mol% of vinyl acetate, 2 to 15 mol% of ethylenically unsaturated carboxylic acid, and an average degree of polymerization of 200 to 1,500.