JPS5817184A - Hot-melt adhesive for fiber - Google Patents

Abstract

PURPOSE:A hot-melt adhesive with excellent dry-cleaning resistance in combination with excellent water-washing resistance, comprising as a base material a molten reaction product of a copolymerized polyester derived from a apecified dicarboxylic acid component and a copolymerized polyamide. CONSTITUTION:A molten reaction product of 80-20wt% copolyester derived from a mixed acid component consisting of terephthalic acid, isophthalic acid and a 4-20C aliph. dicarboxylic acid wherein the combined content of terephthalic acid and isophthalic acid is at least 75mol% of the total acid content and a 2-10C alkylene glycol, and 20-80wt% two-or higher-component copolyamide is used as a base material. 1,4-Butanediol is particularly pref. as the alkylene glycol. Two or higher-component copolyamides contg. nylon 11 and/or nylon 12 are pref. used as said copolyamide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hot melt adhesive for textiles that has both excellent dry cleaning resistance and water washing resistance, and more specifically, a hot melt adhesive for textiles that has excellent dry cleaning resistance and water washing resistance. Hot-melt adhesives are highly practical hot-melt adhesives for textiles that are based on lint-free adhesives.Hot-melt adhesives do not contain solvents and can easily produce adhesive effects just by heating, so they can be used without pollution and in a short time. It is used in a wide range of fields because it has the characteristics of strong adhesive strength, excellent productivity, and labor savings.
Hot melt adhesives for textiles save labor, streamline and speed up the sewing process, and can be used for adhesive interlining, adhesive sewing,
Used for adhering patches, name marks, etc.

Typical examples of such hot melt adhesives for fibers include polyethylene, polyamide, ethylene-vinyl acetate copolymer, polyvinyl chloride, and polyester.

Among them, as a hot melt adhesive for textiles,
Copolyamides are widely used for permanent adhesive applications due to their excellent dry cleaning resistance and excellent adhesion to textiles such as cotton and wool.

However, this product yellows over time and its adhesion decreases due to water absorption, resulting in poor water resistance and washability.In recent years, as washable clothing made of polyester fabrics has become popular, Is it low?
This has become a major problem in terms of commercial value.

On the other hand, polyester hot melt adhesives have excellent adhesion performance for polyester fabrics and excellent water wash resistance, but they have poor dry cleaning resistance and adhesion to natural fiber fabrics such as cotton and wool. Due to its insufficient properties, it is used only in limited applications as a textile adhesive.

The present inventors have conducted extensive research to improve the drawbacks of hot melt adhesives for textiles that are in practical use, and as a result, we have developed a copolymerized polyester derived from a specific dicarboxylic acid component and a copolymerized nylon adhesive. It has been discovered that the molten reaction product has excellent dry cleaning resistance and water washing resistance, and the present invention has been completed.

That is, the present invention provides a mixed acid component consisting of terephthalic acid, isophthalic acid, and an aliphatic dicarboxylic acid having 4 to 20 carbon atoms, in which the total amount of terephthalic acid and isophthalic acid is 75 mol% or more of the total amount of acid components; 80 to 20% by weight of copolyester with alkylene glycol having 2 to 10 atoms and 20 to 80% of binary or ternary or more copolymerized polyamide
A hot melt adhesive for fibers based on a melt reactant with % by weight is provided.

The polyester used in the production of the hot melt adhesive of the present invention is such that the acid component constituting the polyester is terephthalic acid, inphthalic acid, and an aliphatic dicarboxylic acid having 4 to 20 carbon atoms, or the sum of terephthalic acid and isophthalic acid. For copolyesters in which the total amount of terephthalic acid and isophthalic acid is less than 75 mol%, the dry cleaning resistance of the product obtained by the melt reaction with the copolyamide is I don't like it because it's inferior. Examples of aliphatic dicarboxylic acids having 4 to 20 carbon atoms include cono-phosphoric acid, glutaric acid, adipic acid, pimelic acid, superric acid, azelaic acid, sebacic acid, nonanedicarboxylic acid, dodecanedicarboxylic acid, and eicosandicarboxylic acid. etc.

Examples of the alkylene glycol having 2 to 10 carbon atoms used in the copolyester of the present invention include ethylene glycol, 1,3-propanediol, 1,
Examples include 4-butanediol, 1,6-hexanediol, neopentyl glycol, and especially 1.4-
Butanediol is preferred.

The method for producing the copolyester in the present invention is not particularly limited, and can be carried out according to a conventional method. It can be directly esterified or stepwise or transesterified and then polymerized. At that time, any various commonly used catalysts, stabilizers, modifiers, additives, etc. may be used. The copolyamide used in the production of the adhesive of the present invention includes nylon 11 and/or Binary or ternary or higher copolymer polyamides containing nylon 12 are preferred, such as binary copolymers s6/ such as 6/12 nylon (/ represents a copolymer) and 610/12 nylon.
66/12 nylon, 6/610/12 nylon, 66
/610/12 terpolymer such as nylon and 6/66
Those commonly used as adhesives for fibers, such as multicomponent copolyamides such as /610/12 nylon, can be conveniently used.

Many of them are commercially available, specifically 1 Griltex I P2 (Emee
r Werke) Bratamide (Pl'atami (1
) H104P% Same f(005P(PlateBonn
(manufactured by Toshi), Amilan 842P43, and GOLP48 (manufactured by Toshi).

The ratio of the melt reaction between the copolymerized polyester and the copolymerized polyamide to produce the melt reaction product of the present invention is 1: 80 to 20% by weight of the copolymerized polyester, 20 to 80% by weight of the copolymerized polyamide*
Used in a range of %.

If the copolymerized polyester exceeds 80% by weight, dry cleaning resistance decreases, which is not preferable. Further, if the copolyamide content exceeds 80% by weight, the water resistance and washability will decrease, which is not preferable.

An important point of the present invention is to melt-react a copolymerized polyester in which the total amount of terephthalic acid and isophthalic acid is 75 mol% or more of the total amount of acid components, and a copolymerized polyamide of two or more components.

A composition in which both components are simply mixed (unreacted material) has poor dry cleaning resistance and water washing resistance. The melting reaction is carried out in an inert gas atmosphere using a kneader 1 melting kettle,
This can be carried out using an extruder or the like at a predetermined temperature and time. The presence or absence of a reaction can be easily confirmed by checking the fluidity and softening point of a simple mixed composition. That is, as the reaction progresses, a decrease in fluidity and an increase in the softening point are observed. The relationship between reaction temperature/time and fluidity in the melting reaction will be specifically explained in Examples and Comparative Examples described later.

The reactant obtained by the melt reaction can itself be used as an adhesive, but if necessary, stabilizers, colorants, fillers, and other additives may be added to impair the original adhesive properties. 7'? l, -+ phrase 111 F speaking ability n can be used. The hot melt adhesive of the present invention containing such a molten reactant as a base adhesive component can be formed into various forms such as powder, chip, tape, nonwoven fabric, or film, and can be applied to fibers to be bonded. It is used selectively depending on the applicable conditions for the class. These molded adhesives are usually sandwiched between the adhesive surfaces of the adherends and heat-fused, but an adhesive applicator is used to extrude the adhesive in a molten state and apply it onto one of the adherends. It is also possible to bond other adherends by pressing and solidifying them.

The hot melt adhesive for textiles of the present invention can be used for adhesive interlining, adhesion of patches and name marks, repair of clothing, adhesive sewing of edges of sheets, etc.

Next, the present invention will be explained in more detail with reference to Examples. These examples do not limit the scope of the invention.

Note that the characteristic values in the examples were measured by the following method.

(1) Softening point (℃) Measured according to ASTM-28-51T.

(2) Melting point (°C) Using a differential thermal analyzer, the temperature was increased at a rate of 16°C/min, and the endothermic peak temperature during melting was measured, which was defined as the melting point.

(3) Flow rate (r/lo min) A19TM-
Extrusion Plastmeter (Kxtrusion Plastmet) specified in D1238-57T
er) at a temperature of 140° C. and a load of 2160 t.

(4) Peeling strength (9725m) According to J Engineering S-6854, peeling speed 20011m/
Measured in minutes. Perchlorethylene and synthetic detergent 0.5
The wet peel strength of water containing 0% by weight was measured by immersing an adhesive test piece in each solution for 20 minutes in the case of perchlorethylene and 30 minutes in the case of water, and then spraying each solution. 5) Reduced viscosity (ηsp/c) (az/f) Sample 0.5f in orthochlorophenol solvent 50-
was dissolved, and the number of seconds of falling was determined using an Osttwald viscosity tube in a constant temperature bath at 35°C, and the value obtained by dividing this value by the number of seconds of falling of only the solvent was calculated as ηre1. Then ηs p/c is 1 ηsp/c
=ηre1. -1 Examples 1 to 3 Comparative Examples 1 to 5 Terephthalic acid (abbreviated as TPA) 47 mol%, isophthalic acid (abbreviated as PA) 28 mol%, cono-phosphoric acid (abbreviated as SGA) 1 mol %, glutaric acid (abbreviated as GA) 3 mol%,
Copolymerized polyester (A) consisting of an acid component consisting of 21 mol% of adipic acid (abbreviated as ADA) and 1,4-butanediol (abbreviated as 1,4-BD) [melting point 127°C, softening point 130°C, flow rate 197 t/1° min] and Grilltex IP2 (manufactured by Kmser Werke) [melting point 112°C, softening point 125°C, flow rate 12f/
10 minutes] at various ratios at 250°C for 120 minutes in a nitrogen gas atmosphere using a 300 cc kneader.
A melt reaction was carried out under the conditions of Qrpm, and a film having a thickness of 40 μm was prepared from the obtained reaction product using a hot press. The obtained film was sandwiched between polyester/cotton (=65/35) broadcloths, and using a heat sealer (Tester Sangyo Exhibition), it was heated to 0.3
It was crimped at a pressure of Kff/aI and used as a sample for a peel test. The results of the peel test are shown in Table 1. Also, 130
Table 1 also shows the results of simple blending at ℃ for 15 minutes.

As can be seen from this table, the molten reactant with an elevated softening point and low flow rate (mixed mixture at 250°C for 120 minutes) has significantly superior peel strength when wet with perchlorethylene and when wet with water. (Examples 1 to 3), simple blends (
130° C. for 15 minutes) had far inferior peel strength when wet with perchlorethylene (Comparative Examples 1 to 3).

Furthermore, if the blending ratio of copolyester/copolyamide is outside the scope of the present invention, either the peel strength of perchlorethylene when wet or when wet with water is poor, resulting in poor dry cleaning resistance and water wash resistance. It is difficult to combine them (Comparative Examples 4 and 5) 0 As can be seen by comparing the softening point and flow rate of the melt reactant and the simple blend, the melt reaction causes an increase in the softening point and a decrease in the flow rate ( (decreased liquidity) was observed,
This allows confirmation of the presence or absence of a reaction.

Examples 4 to 5, Comparative Examples 6 to 8 Copolymerized polyvarnishes having various compositions listed in Table 2 were heated at 250°C and 60% by weight in the same equipment as in Example 1.
The reaction was carried out under the conditions of 40 minutes, r, p, m, and the obtained product was used in the same manner as in Example 1 to prepare a sample for peeling test, and the same test as in Example 1 was conducted. Shown in the table.

As can be seen from this table, the melt reaction product of a copolyester and a copolyamide in which the total amount of terephthalic acid and isophthalic acid in the copolyester acid component is less than 75 mol% has a peel strength when wetted with perchloromethane. It is inferior in quality and cannot be put to practical use as an adhesive.

Example 6 Bratamide I instead of Gritex IP2 in Example 2
A peel test was conducted in the same manner as in Example 2 except that 104P (manufactured by Plate Bonn) was used.

As a result, the normal peel strength is 1250 f/25 t
ea, perfluoroethylene wet peel strength 740t
/25 column and peel strength when wet with water is 830f/25mm
Met. This adhesive strength is sufficient for practical use in dry cleaning and water washing.

Patent applicant: Asahi Kasei Industries, Ltd. Agent Akira Agata

Claims (1)

[Claims] l A mixed acid component consisting of terephthalic acid, inophthalic acid, and aliphatic dicarboxylic acid having 4 to 20 carbon atoms, in which the total amount of terephthalic acid and isophthalic acid is 75 mol% or more of the total amount of acid components, and 2 to IO carbon atoms A hot-melt adhesive for fibers based on a melt reaction product of 80 to 20% by weight of copolyester with alkylene/glycol and 20 to 80% by weight of binary or ternary or more copolyamide