JPH10237412A - Hot melt adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve adhesion which is highly resistant to dry cleaning, by compounding a polyester-urethane copolymer resin with a styrene-maleic acid copolymer so as for the resultant mixture to have a specific melt viscosity. SOLUTION: This adhesive is prepared by compounding a solution of a polyester-urethane copolymer resin, which has a saturated thermoplastic polyester as its main chain and a urethane as a side chain, in a methyl ethyl ketone/ toluene mixed solvent at a concentration of 20 to 40wt.% with 5 to 15wt.% of a tackifier such as a styrene-maleic acid copolymer. The adhesive has a melt viscosity at 125 deg.C of 400 to 600Pa.s and exhibits a tensile elongation at room temperature of 1,200% or more. The adhesive having such a melt viscosity can seep into textures of a water-repellent base cloth and an uneven surface of a body to be adhered, and by using the adhesive an adhesive thickness of 40 to 80μm which is necessary for effective adhesion can be ensured. Due to the softness and a large tensile elongation of this adhesive, stress relaxation takes place at the interface between an adhesive and a body to be adhered in peeling, which results in great adhesiveness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt adhesive in which an adhesive is easily adhered to a water-repellent fabric or substrate at a low temperature of 130.degree. Things.

[0002]

2. Description of the Related Art When displaying a name or a design, a bonding method is often used in which a laminated sheet for marking cut in a predetermined shape can be firmly bonded only by laminating a hot melt adhesive surface and a fabric and hot pressing. Used in fishing and sports clothing. However, there is still a hot-melt adhesive which has a sufficient adhesive strength to a fabric or a substrate which has been subjected to a water-repellent treatment with a silicon / fluorine-based water-repellent agent and can be bonded at 130 ° C or less. Did not. There are hot-melt adhesives that adhere to adherends such as water-repellent fabrics and substrates.
It is necessary to press at a temperature higher than 130 ° C., and at such a high temperature, the fabric or the base material may be deteriorated. Also,
In order to improve the adhesive strength, it is necessary to scrape off the water repellent in the adhesive area or wipe it off with a solvent, which is troublesome and consequently contaminates the fabric and the base material, and the adhesive strength varies. There was a problem. Dry cleaning is generally used as a cleaning method for fabrics and substrates that have been water-repellent with a silicon / fluorine-based water repellent. There was also a problem that the film was easily peeled.

[0003]

SUMMARY OF THE INVENTION
Hot-melt that can easily adhere at low temperatures to adherends that have a water-repellent surface, such as fabrics that have been water-repellent with a fluorine-based water-repellent, and that have excellent dry-cleaning resistance after adhesion No adhesive has been developed. The present invention
The present invention has been made in view of such a problem, and an object thereof is to enable an adhesive to be easily adhered to the above-mentioned adherend having water repellency at a low temperature of 130 ° C. or less, and To provide a hot melt adhesive having good dry cleaning resistance.

[0004]

Means for Solving the Problems To solve the above problems,
This can be achieved by using a hot melt adhesive obtained by blending a styrene-maleic acid resin with a polyester-urethane copolymer resin, particularly a hot melt adhesive having a melt viscosity (125 ° C.) of 400 to 600 Pa · s. became. In addition, the hot-melt adhesive contained a styrene-maleic acid copolymer resin in an amount of 3 to 15% by weight, so that the adherend subjected to the water-repellent treatment and the marking sheet adhesive could be easily bonded. .

[0005] The polyester-urethane copolymer resin used in the present invention has a saturated thermoplastic polyester in the main chain and urethane in the side chain. The above-mentioned copolymer resin is dissolved in a solvent (for example, a mixed solvent of MEK / toluene) to facilitate the mixing and coating operations, and the resin is added in an amount of 20 to 40% by weight.
It is suitable for use as a contained solution for bonding. The polyester-urethane copolymer resin is less likely to swell in petroleum turpentine, which is a solvent generally used in dry cleaning, than the polyester resin, and thus has good dry cleaning resistance. Further, the other styrene-maleic acid copolymer resin is for imparting tackiness and melt fluidity to the polyester-urethane copolymer resin, and is used for petroleum turpentine which is a solvent used for dry cleaning. Hardly dissolves, so that it also provides dry cleaning resistance.

[0006] Generally, in order to impart tackiness, usually,
Rosin or a derivative thereof, a tackifying resin such as a terpene-based or pinene-based resin is used, but in the present invention,
Good compatibility with polyester-urethane copolymer resin,
It is indispensable to use a styrene-maleic acid copolymer resin in order to simultaneously impart tackiness, melt fluidity (125 ° C.), and dry cleaning resistance. Styrene-
If the content of the maleic acid copolymer resin is less than 3% by weight, the melt fluidity becomes poor, so that the adhesive may penetrate into the weave traces of the water-repellent treated base fabric and the surface irregularities of the adherend. If it is not possible, the adhesive strength will be low, and if it is more than 15% by weight, it will melt and flow too much, causing exudation and stain, and the adhesive layer will be too thin, resulting in low adhesive strength.
Therefore, the addition amount of the styrene-maleic acid copolymer resin is 3 to 15% by weight, preferably 5 to 12% by weight.

The temperature of the melt viscosity of the hot melt adhesive obtained in the present invention is particularly specified to be 125 ° C. in general, for fabrics for sports clothing and polyethylene terephthalate.
(PET) In many cases, an adhesive is bonded to an adherend such as a sheet by melting a hot-melt adhesive, and if the bonding temperature at this time is 130 ° C. or higher, the adherend tends to deteriorate, and This is because deterioration hardly occurs at ℃. In the present invention, the melt viscosity at 125 ° C. is particularly 400 to 600
In the range of Pa · s, the molten adhesive penetrates into the weave traces of the water-repellent base fabric and the surface irregularities of the adherend, and the required thickness of the adhesive layer (normally 40 to 80 μm) is secured. The advantages that can be achieved are exhibited. However, if the adhesive in the present invention is very hard and has no elongation, stress concentration occurs at the interface between the adhesive and the adherend at the time of peeling, the adhesive does not remain on the adherend side, and high adhesive strength is obtained. Not expressed. Conversely, if the adhesive is very soft and has a large elongation, the stress will be relaxed at the interface between the adhesive and the adherend at the time of peeling, and the adhesive will remain on the adherend, and high adhesive strength will be exhibited. . Therefore, in the present invention, the elongation (at the time of cutting) of the hot melt adhesive at normal temperature is
It must be at least 1200%.

[0008]

EXAMPLE 1 A hot melt base mainly composed of a polyester-urethane copolymer resin dissolved in a mixed solvent of MEK / toluene / cyclohexanone (5/5/4 ratio)
(Toyobo Co., Ltd. Byron UR-8700: solid content 30% by weight), the content of styrene-maleic acid copolymer resin (Alastor 700, Arakawa Chemical Co., Ltd.) becomes 10% by weight (solid content basis) After mixing uniformly, 100μm thick PE
Apply on a T-sheet (adhesive) and dry to a thickness of 60μ
m of the hot melt adhesive layer was formed. The melt viscosity of the hot melt adhesive layer at 125 ° C. was 600 Pa · s. The PET sheet having the hot-melt adhesive layer is placed on the cloth of the adherend which has been subjected to the water-repellent treatment with the fluororesin, and the hot-melt adhesive surface is brought into contact with the water-repellent treated surface of the cloth. Bonding was performed by pressing twice at a temperature of 125 ° C. and a pressure of 500 g / cm ² for 20 seconds. After leaving to cool for one hour, the adhesive strength between the fabric of the obtained laminate and the PET sheet was measured and found to be 1.0 N / mm 2. When the obtained laminate was dry-cleaned, PE
No peeling of the T sheet from the fabric was observed.

[0009]

Comparative Example 1 Example 1 was repeated except that a hot-melt adhesive mainly composed of a PET polyester resin (Toyobo Co., Byron 55SS: solid content 35% by weight) was used.
In the same manner as in the above, a hot melt adhesive and a laminate were obtained.
The melt viscosity of the hot melt adhesive layer at 125 ° C is 1200
Pa · s, the adhesive strength between the laminated fabric and the PET sheet
It was 0.4 N / mm. When the obtained laminate was cleaned, the fabric and the PET sheet were separated once.

[0010]

Comparative Example 2 A hot-melt adhesive and an adhesive were prepared in the same manner as in Example 1 except that the content of the styrene-maleic acid copolymer resin (Alastor 700 manufactured by Arakawa Chemical Co., Ltd.) was changed to 30% by weight. A laminate was obtained. The melt viscosity of the obtained hot melt adhesive and the adhesive strength of the laminate were measured. The melt viscosity was 800 Pa · s, and the adhesive strength was 0.6 N / mm. Table 1 shows the test results in which no peeling of the PET sheet was observed even when the laminate was dry-cleaned 5 times or more.

[0011]

[Table 1]

(Evaluation method) Regarding the adhesive strength, 1
A test piece of 00 mm x 20 mm was prepared, and the PET and the fabric were pulled at a speed of 0.83 mm / s by a tensile tester, and the strength at 90 degree peeling was measured. The determination will be described below. For dry cleaning resistance, a sample obtained by bonding a hot melt adhesive-coated 60 mm × 40 mm PET to a 80 mm × 60 mm water-repellent fabric was subjected to a dry cleaning test according to JIS L 0860, and the degree of peeling was measured. I saw
The determination will be described below. Dry cleaning test No peeling even if performed 5 times or more.

[0013]

As described above, the hot-melt adhesive of the present invention has good fluidity at the time of bonding. And a material which adheres easily and does not easily swell in a solvent used for dry cleaning, and therefore has a remarkable effect that dry cleaning resistance is good.

Claims (4)

[Claims] 1. A hot-melt adhesive for adhering an adhesive to an adherend having water repellency, comprising a polyester-urethane copolymer resin and a styrene-maleic acid copolymer resin blended at 125 ° C. Viscosity 400-600Pa ・ s
A hot melt adhesive, characterized in that: 2. The hot melt adhesive according to claim 1, wherein the content of the styrene-maleic acid copolymer resin is 3 to 15% by weight. 3. The hot melt adhesive according to claim 1, having a tensile elongation at room temperature of 1200% or more. 4. The adhesive having water repellency is a fabric subjected to a water repellent treatment, and the adhesive is a marking sheet.
5. The adhesive according to any one of items 1 to 4.