JPH0673361A - Hot-melt adhesive for temporary bonding of padding - Google Patents

Abstract

PURPOSE:To obtain a hot-melt adhesive which enables thermal press adhesion at a low temp. and causes the adhesion once obtd. therewith to be nullified when heated again by using a polyester having specified glass transition point and softening point. CONSTITUTION:This adhesive is made from a polyester (pref. an arom. polyester having a wt.-average mol. wt. of 3,000-60,000) having a glass transition point of 45-70C deg. and a softening point of 85-120C deg.. Padding cloths impregnated with the adhesive are laid one on top of another and bonded to each other by thermal pressing at 70-120C deg.. After the resulting padding is sewn, it is heated to 90-160C deg. to nullify the adhesion. Thus, washing with water or a solvent and drying after washing are made unnecessary, the simplification of process is made possible, and a high-quality sewing product is obtd. without causing any change in the dimension of a surface cloth or a padding due to washing with water.

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 for interlining temporary fixing. More specifically, it is an adhesive that is peeled off by reheating.

[0002]

2. Description of the Related Art In recent years, permanent adhesives and temporary adhesives have been widely used as interlining adhesives in garment sewing. A hydrophobic hot melt adhesive (for example, polyester resin) is known as a permanent adhesive. Water-soluble or hydrophobic hot-melt adhesives are known as temporary adhesives. For example, in the case of powdery polyvinyl alcohol which is a water-soluble hot melt adhesive, the powder is sprinkled on the interlining material, heated and fixed, and then heat-pressed (130 to 1).
(60 ℃) to make a temporary bond with the outer material, and then cut,
After sewing, the adhesive is removed by washing with water (JP-A-54-7).
6635 and JP-A-59-66474). In addition, α-olefin, which is a hydrophobic hot melt adhesive,
In the case of a vinyl ester copolymer, the adhesion between the interlining material and the outer material is performed in the same manner as in the case of water-soluble polyvinyl alcohol, but the adhesive is removed by the halogenated organic solvent treatment to release the adhesion between the inner material and the outer material ( JP-A-59-9202).

[0003]

However, all of the hot-melt adhesives for interlining temporary fixing that have been proposed hitherto have high melt viscosities, and therefore cannot be bonded unless they are heated and pressed at a high temperature of 120 to 180 ° C. Furthermore, in order to separate the interlining and the outer material after sewing, it is necessary to remove the temporary fixing adhesive by washing. That is, in the case of a water-soluble hot melt adhesive, it is necessary to wash (wash) with water and dry, and in the case of a hydrophobic hot melt adhesive, it is necessary to wash and dry with a harmful halogenated organic solvent. Further, the former adhesive is apt to cause a dimensional change of the cloth and the interlining by washing with water, and it is difficult to apply it to a natural fiber cloth such as wool, silk and cashmere, which is particularly susceptible to washing with water. Since the latter adhesive is washed with an organic solvent, the dimensional change and texture of the fabric after washing are good, but a harmful halogen organic solvent must be used, which is a safety problem.

[0004]

The present inventors have arrived at the present invention as a result of extensive studies to improve the above problems.
That is, the present invention has a glass transition temperature of 45 to 70 ° C and a softening point of 85.
-120 ° C polyester (A) hot melt adhesive for interlining temporary fixing and interlining containing the adhesive, overlaying the outer material and heat-pressing at 70-110 ° C to sew the adherend A method of using the adhesive, characterized in that the adhesive between the interlining material and the outer material is released by subsequent reheating to 90 to 160 ° C.

The polyester (A) used in the present invention is a condensation polymer (linear polyester) of a diol component (a) and a dicarboxylic acid component (b) and (a).
And (b) and a small amount of a polyfunctional monomer component (c) having 3 or more valences (branched or crosslinked polyester)
And modified products thereof.

Examples of the diol component (a) include (1) ethylene glycol, 1,2-propylene glycol, 1,4-butanediol, neopentyl glycol, 1,
C2-C12 alkylene glycol such as 6-hexanediol; (2) alkylene ether glycols such as diethylene glycol, dipropylene glycol, polyethylene glycol and polytetramethylene glycol;
(3) 1,4-cyclohexanedimethanol, alicyclic diol having 6 to 30 carbon atoms such as hydrogenated bisphenol A; and (4) alkylene oxides (ethylene oxide, ethylene oxide, bisphenol A, bisphenol F, bisphenol S, etc.). Propylene oxide, butylene oxide, etc.) 2 to 8 mol addition product. Of these, preferred are (1) and (4), and particularly preferred are alkylene oxides (ethylene oxide and / or bisphenol A or bisphenol F).
Or propylene oxide) 2 to 4 mol addition product.

The dicarboxylic acid component (b) includes (1)
Aliphatic dicarboxylic acids having 2 to 20 carbon atoms such as maleic acid, fumaric acid, succinic acid, adipic acid, azelaic acid and glutaconic acid; (2) 8 carbon atoms such as phthalic acid, isophthalic acid, terephthalic acid and naphthalenedicarboxylic acid To 20 aromatic dicarboxylic acids; (3) alkyl or alkenyl succinic acids having a hydrocarbon group of 4 to 35 carbon atoms in the side chain, such as octyl succinic acid and dodecenyl succinic acid; and acid anhydrides and lower of these dicarboxylic acids. Examples thereof include alkyl (methyl, butyl, etc.) esters. Of these, preferred are (anhydrous) maleic acid, fumaric acid, isophthalic acid, terephthalic acid, dimethyl terephthalate and dodecenyl (anhydrous) succinic acid, and particularly preferred are fumaric acid, isophthalic acid and terephthalic acid.

Examples of the trivalent or higher polyfunctional monomer component (c) include a trivalent or higher valent polyol component (c1) and a trivalent or higher valent polycarboxylic acid component (c2). (C
Specific examples of 1) include (1) trimethylolpropane, pentaerythritol, sorbitol and the like having 3 carbon atoms.
To 20 aliphatic polyhydric alcohols; (2) alkylene oxide adducts of these polyhydric alcohols. Specific examples of (c2) include (1) aliphatic polycarboxylic acids having 7 to 20 carbon atoms such as 1,2,4-butanetricarboxylic acid and 1,2,7,8-octanetetracarboxylic acid; ) 1,2,4-Cyclohexanetricarboxylic acid and other alicyclic polycarboxylic acids having 9 to 20 carbon atoms; (3) 1,2,4-benzenetricarboxylic acid, 1,2,5-benzenetricarboxylic acid, pyromellitic acid And aromatic polycarboxylic acids having 9 to 20 carbon atoms such as acids; and acid anhydrides and lower alkyl esters (methyl, butyl, etc.) thereof. The amount of (c) used is usually 0 to 20 mol%, preferably 0 to 5 mol%, based on all the monomer components.

In the present invention, a polyester having an aromatic ring in the molecule is preferable in terms of blocking resistance, and at least one of the diol component (a) and the dicarboxylic acid component (b) is a monomer having an aromatic ring. It is preferable.

The polyester (A) of the present invention can be obtained by reacting the above-mentioned monomer components by a conventional method at an alcoholic hydroxyl group / carboxyl group equivalent ratio of usually 0.6 to 1.5, preferably 0.8 to 1.2. it can.

The reaction is carried out at 150 to 300 ° C., preferably 170 to 280 ° C. in the absence of a catalyst or in the presence of a catalyst usually used for polyesterification reaction (for example, dibutyltin oxide, tetrabutyl titanate, zinc acetate, etc.). Be seen. The reaction can be carried out under normal pressure, increased pressure or reduced pressure, but it is preferable to carry out the reaction system under reduced pressure after reaching a predetermined reaction rate (for example, about 30 to 90%).

The polyester (A) of the present invention is usually 0.5 to 3
An acid value of 0, preferably 2 to 15 mg KOH / g and usually 5 to 15
It has a hydroxyl value of 0, preferably 10 to 80 mg KOH / g. Further, (A) usually has a glass transition point (hereinafter abbreviated as Tg) 45 to 70 ° C. and a softening point (hereinafter abbreviated as SP) 85.
~ 120 ℃, weight average molecular weight (hereinafter abbreviated as Mw) 3,000
~ 60,000, preferably Tg50-60 ° C, SP85-100 ° C,
Mw is 4,000 to 20,000. If the Tg is less than 45 ° C, blocking occurs, which is not suitable. Also, SP is less than 75 ℃, Mw
When the value is less than 3,000, the initial adhesiveness between the interlining material and the surface material becomes insufficient. On the other hand, Tg is 70 ℃, SP is 120 ℃ or M
When w exceeds 60,000, not only does the texture of the interlining become hard, but it becomes difficult to release the adhesion by reheating the adherend.

If necessary, an inorganic filler such as colloidal silica or titanium oxide fine powder may be added to the adhesive of the present invention for the purpose of preventing blocking and improving fluidity. If necessary, other hot melt adhesives such as polystyrene resin, polyamide resin, epoxy resin,
It is also possible to use ethylene / vinyl acetate resin, rosin acid ester resin and the like together.

In the adhesive of the present invention, the polyester (A) is usually about 20 to 300 mesh, preferably 60 to 2 with a crusher.
Finely pulverized to 00 mesh. If it is coarser than 20 mesh, the temperature required for heat setting will be high and the texture of the interlining will be poor. On the other hand, if the mesh is finer than 300 mesh, fine powder is buried in the interlining material, and the effective adhesive component on the interlining surface is reduced, which is not preferable.

Since the adhesive of the present invention is in powder form, it can be easily processed for interlining. That is, the powdered adhesive is continuously sprayed on the interlining material by the powdery adhesive,
It is melted and fixed by heating at 120 ° C for 1 to 60 seconds.
The amount of adhesive sprayed is usually about 3 to 60 g / m ² , and preferably 5 to 20 g / m ² . The obtained interlining material is overlaid with the outer material, for example, iron load 50 to 500 g / m ² , pressing time
It is thermocompression bonded (temperature 70-120 ℃) under the condition of 1-60 seconds. The adhesive strength after thermocompression bonding is 2 g / 2 cm to 200 g / 2 cm, which is practically sufficient.

Since the cloth temporarily adhered using the adhesive of the present invention is sewn in a pre-adhered state, the cloth can be sewn just as it is cut without any displacement of the positions of the interlining and the outer material. Further, the sewn product using the adhesive of the present invention can easily release the adhesive portion that has been temporarily adhered in advance by reheating. For example 90-16
Adhesion can be easily released by heating for 10 to 120 seconds with an oven, steam set, iron, steam iron, etc. adjusted to a temperature of 0 ° C. The sewn product that can be debonded has good texture and high quality.

[0017]

The present invention will be further described with reference to the following examples, but the present invention is not limited thereto. In the following, “part” means “part by weight” and “%” means “% by weight”. The raw materials used in the examples,
The physical property measuring methods and evaluation methods are as follows. (1) Raw materials used 1) Glycol A: 2.2 mol of propylene oxide adduct of bisphenol A 2) Glycol B: 2.3 mol of ethylene oxide adduct of bisphenol A 3) Penta: pentaerythritol 4) FA: Fumaric acid 5) SA: Succinic acid 6) TPA: terephthalic acid 7) IPA: isophthalic acid 8) TBT: tetrabutyl titanate 9) DBTO: dibutyltin oxide 10) silica: colloidal silica R972 (manufactured by Nippon Aerosil)

(2) Method of measuring physical properties of polyester 1) Acid value and hydroxyl value The method specified in JIS K0070. If the sample does not dissolve, use a solvent such as dioxane or tetrahydrofuran. 2) Glass transition point (Tg) Method prescribed in ASTM D3418-82 (DSC)
Law). 3) Softening point (SP) The method specified in JIS K25321 (ring and ball method). 4) Weight average molecular weight Gel permeation chromatography (GP
Measured in C). The measurement conditions are as follows. Apparatus: Toyo Soda Co., Ltd. HLC-802A column: TSKgelGMH6 2 Measuring temperature: 25 ° C. Sample solution: 0.5% tetrahydrofuran solution Injection amount: 200 μl Detector: Refractive index detector Molecular weight calibration: A standard polystyrene molecular weight calibration curve Create.

(3) Evaluation Method of Adhesive 1) Blocking Property The adhesive fine powder was put in a 10 ml screw tube and stored in an atmosphere of 45 ° C., and the blocking property after 24 hours was checked. ◯: Not blocked ×: Blocked and does not re-disperse even when a light impact is applied to the screw tube 2) Adhesive strength A predetermined amount (about 10 g / m ² ) of fine powder of adhesive is sprayed on cotton broad # 40. , Outer fabric [Polyester / Cotton (65/3
5) No. 60 Broad ”was overlaid and heat-pressed for 20 seconds at a pressure of 300 g / cm ² using a hot iron at 100 ° C. The adhesive strength of the adherend was measured with Autograph AGS-500B [Shimadzu (manufactured)]. 3) Peelability (release of adhesion) The obtained adherend was passed through a pin tenter (manufactured by Tsujii Dyeing Machine) set at 150 ° C for 20 seconds, and the peel strength was measured by an autograph. 4) Re-adhesion property 3) The interlining and the outer material, which are peeled off, are piled up alternately and 20 cm
The re-adhesion property was evaluated by leaving the sample at a thickness of 40 ° C. and leaving it in an atmosphere at 40 ° C. for 1 week. ○: Not re-bonded ×: Re-bonded

EXAMPLE 1 820 parts of glycol A, 260 parts of FA, and 2 parts of TBT were placed in a reaction vessel equipped with a thermometer, a stirrer, a condenser and a nitrogen introducing tube, and the mixture was reacted at 180 to 210 ° C. in a nitrogen stream to obtain an acid value. A polyester having a hydroxyl value of 14 and a hydroxyl value of 47 was obtained. After cooling, it was ground to 80 to 120 mesh to obtain the adhesive 1 of the present invention. Example 2 411 parts of glycol A, 316 parts of glycol B, 255 parts of TPA and 2 parts of DBTO were placed in the same reactor as in Example 1 and reacted at 230 ° C. in a nitrogen stream. When the reaction product became transparent, the reaction temperature was lowered to 200 ° C., and the polyesterification reaction was performed under reduced pressure until the acid value became 2.1. The hydroxyl value of the obtained polyester was 39. After cooling, it was pulverized to 80 to 120 mesh to obtain the adhesive 2 of the present invention. Example 3 A polyester having an acid value of 4.3 and a hydroxyl value of 35 was obtained in the same manner as in Example 2 except that 763 parts of glycol A and 302 parts of IPA were used. After cooling, it was pulverized to 80-120 mesh to obtain the adhesive 3 of the present invention. Example 4 A polyester having an acid value of 8.1 and a hydroxyl value of 36 was obtained in the same manner as in Example 1 except that 760 parts of glycol B was used instead of glycol A. After cooling, it was ground to 80 to 120 mesh, and 2 parts of silica was externally added and uniformly mixed to obtain an adhesive 4 of the present invention. Comparative Example 1 Example 1 except that 800 parts of glycol A and 270 parts of SA were used.
A polyester having an acid value of 0.8 and a hydroxyl value of 22 was obtained in the same manner as in. After cooling, the mixture was pulverized to 80 to 120 mesh, 2 parts of silica was externally added and uniformly mixed to obtain a comparative adhesive 5. Comparative Example 2 Glycol A 700 parts, penta 40 parts, TPA 340 parts, DBT
In the same manner as in Example 2 using O3 part, an acid value of 3.6,
A polyester having a hydroxyl value of 19 was obtained. After cooling, it was ground to 80 to 120 mesh to obtain a comparative adhesive 6.

Table 1 shows the physical properties of the polyesters obtained in Examples 1 to 4 and Comparative Examples 1 and 2.

[0022]

[Table 1]

Table 2 shows the evaluation results of the adhesives obtained in Examples 1 to 4 and Comparative Examples 1 and 2.

[0024]

[Table 2]

[0025]

EFFECT OF THE INVENTION The hot-melt adhesive for temporary fixing of interlining can temporarily heat-bond the interlining and the outer material at a low temperature of 70 to 120 ° C., and can easily release the adhesion by reheating after sewing. . Therefore, this adhesive has the following features as compared with the conventional hot-melt adhesive for temporary fixing. 1. Pressurization and pressure bonding can be performed at low temperatures of 70 to 120 ° C, enabling energy saving and rationalization. 2. Adhesion can be easily released by reheating to 90 to 160 ° C, so washing with water, solvent washing and drying are not required, and the process can be simplified, and the dimensions of the fabric and interlining do not change due to washing with water. Finished sewn products of good quality.

Claims (5)

[Claims] 1. A glass transition temperature of 45 to 70 ° C. and a softening point of 85.
A hot melt adhesive for interlining temporary fixing, characterized by comprising a polyester (A) having a temperature of up to 120 ° C. 2. The weight average molecular weight of (A) is 3,000 to 60,00.
The adhesive according to claim 1, which is 0. 3. The adhesive according to claim 1, wherein (A) is a polyester containing an aromatic group. 4. The adhesive according to claim 1, wherein (A) is a polyester having a bisphenol A skeleton. 5. An interlining material containing the adhesive according to any one of claims 1 to 4 is overlaid with an outer material and heat-pressed at 70 to 110 ° C.,
By reheating the adherend to 90 to 160 ° C. after sewing,
A method of using an adhesive, characterized in that the adhesion between the interlining material and the outer material is released.