JPS6032722B2 - hot melt adhesive fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to hot-melt adhesive fibers, particularly hot-melt adhesive fibers that have high adhesion to polyester striped three-woven fabrics and are free from problems in post-process passability.

In recent years, a variety of hot melt adhesives for bonding textile, woven and knitted fabrics have been developed that take advantage of their advantages of being non-polluting, high adhesive performance, and instant adhesive properties, especially adhesives for polyester fibers, which have a high proportion in woven and knitted fabrics. However, it is rarely used because of problems such as poor adhesive strength retention after dry cleaning, transparency of the bonded area depending on the application, shape retention of the adherend after bonding, and texture.

Moreover, the shapes of these adhesives are both film and
It is a powder, non-woven fabric, and is not manufactured as a fiber. When used as an adhesive for textiles, the advantages of forming the adhesive into fibers are significant, including streamlining, labor saving, and high added value.

The present inventors have focused on these points and have continued their intensive research, and have found that if a copolymerized polyester with a specific composition is used,
The present invention was completed based on the discovery that it is easy to make fibers using molten paper threads and that excellent effects can be obtained as an adhesive. That is, the present invention uses 36 to 84 mol% of terephthalic acid or a lower alkyl ester thereof, and 14 mol% of isophthalic acid or a lower alkyl ester thereof as a dibasic brewing component.
~1 mol% and aliphatic dicarboxylic acid or its lower alkyl ester 50-15 mol%, and the glycol component consists of 80-20 mol% ethylene glycol and 20-80 mol% 1,4-butanediol, and its intrinsic viscosity is at least 0.5 and the melting point is 10
The hot melt adhesive fiber is made of a copolymerized polyester having a molecular weight of 0 to 160 qo, and is characterized by having a fiber strength of 1.5 m/D or more and a fiber elongation of 10% or more.
Here, the limiting viscosity is phenol/tetrachloroethane = 6
This is the zero extrapolated value of the relative viscosity measured at 3000 in a mixed solvent of '4 (weight ratio), and the melting point is the value measured with a fully automatic melting point measuring device (METTLER, MODEL FP-1).

Moreover, the value of fiber strength and elongation was in accordance with JISLI070-64. The hot-melt adhesive fiber of the present invention has a strength of 1.5 /
Since it has a D or more and an elongation of 10% or more, it can withstand post-processing such as wire making and weaving, and has excellent dry cleaning properties, transparency, shape retention, and texture of adherends after bonding.

When the fiber strength is less than 1.5 mm/D, thread breakage occurs during knitting, weaving, etc., so that it cannot be put to practical use. The same applies to fiber elongation. The dibasic brewing component of the copolymerized polyester used in the present invention consists of three components: terephthalic acid or its lower alkyl ester, isophthalic acid or its lower alkyl ester, and aliphatic dicarboxylic acid or its lower alkyl ester, and glycol The components consist of two components: ethylene glycol and 1,4-butanediol.

Aliphatic dicarboxylic acids include succinic acid, glutaric acid,
Examples include dicarboxylic acids having 4 to 12 carbon atoms, such as adipic acid, azelaic acid, sebacic acid, and dodecanedicarboxylic acid. One type or two or more types of aliphatic dicarboxylic acids may be used. Particularly preferred aliphatic dicarboxylic acids include adipic acid, azelaic acid, and sebacic acid. The proportions of the dibasic brewing components are 36 to 84 mol% of terephthalic acid or its lower alkyl ester, 14 to 1 mol% of isophthalic acid or its lower alkyl ester, and 50 to 15 mol% of aliphatic dicarboxylic acid or its lower alkyl ester.
It is mole%.

If the proportion of the dibasic brewing component is outside the range of the present invention, the desired properties as a hot melt adhesive fiber in the present invention will be lacking. For example, if the amount of isophthalic acid is less than 1 mol %, the adherend will be significantly deformed after the adhesive treatment, and in particular, in the case of a tape-shaped adherend, not only will the adherend be twisted but also the transparency will be insufficient. Furthermore, if the content of isophthalic acid exceeds 14 mol %, the adhesiveness to the object to be treated decreases, and the dry cleaning resistance is also insufficient. On the other hand, if the aliphatic dicarboxylic acid content is less than 15 mol %, the fixed portions become hard and brittle. On the other hand, if the aliphatic dicarboxylic acid content exceeds 50 mol %, the adhesiveness to the adherend decreases. The respective proportions of glycol components are ethylene glycol 20 to 80 mol% and 1.4
-butanediol 80-20 mol%.

If the ethylene glycol content is less than 20 mol%, the transparency will be poor, and if it exceeds 80 mol%, the thread will be sticky and difficult to handle, and the solidification after fixation with the glue body will be insufficient. be. The English-polymerized polyester of the present invention contains a small amount of trivalent or higher polybasic acid in addition to the above-mentioned dibasic acid as an acid component, and a small amount of trivalent or higher polyhydric alcohol other than Kamiyoshi glycol or oxycarboxylic acids as an alcohol component. You can leave it there.

The intrinsic viscosity of the copolyester of the present invention is at least 0
．． It is preferably 0.6 to 1.5.

When the intrinsic viscosity is less than 0.5, the bending of the fibers coming out of the spinneret during melt-grade yarn is large, and the solidification point is also far away from the spinneret, which not only causes a decrease in workability but also reduces adhesion. It causes seepage around the fixed parts of the body and has low adhesive strength, which is not preferable. The polyester of the present invention has a melting point of 100 to 16
It is necessary to select the molar ratio of the above components and alcohol components so that the temperature is 0°C.

If the melting point exceeds 160 qo, it is necessary to increase the temperature for adhesion, making it impractical;
If it is lower, it is unfavorable from the viewpoint of tackiness and seepage from the adherend. The method for producing the copolymerized polyester of the present invention is to perform a transesterification reaction using dimethyl phthalate or dimethyl isophthalate and ethylene glycol or 1,4-butanediol, then add an aliphatic dicarboxylic acid to carry out an esterification reaction, and then perform a polymerization reaction. Any method can be employed, such as a condensation reaction, or an esterification reaction of terephthalic acid, isophthalic acid, or aliphatic dicarboxylic acid with ethylene glycol or 1,4-butanediol followed by a condensation reaction.

The adhesive fiber of the present invention is mainly composed of the above-mentioned copolyester, and additives such as antioxidants, ultraviolet absorbers, pigments, dyes, nucleating agents, and flame retardants are added within limits that do not affect its performance. Can be blended.

A conventionally known spinning method can be used to obtain fibers with a fiber strength of 1.5 mm/D or more and a fiber elongation of 10% or more from the above copolyester, but the take-up speed at melt grade yarn is If the normally used speed range is adopted, the tension of the molten fiber is high and the fibers are likely to break, so it is necessary to lower the take-up speed.
The range of 0/min to 200/min is preferable, and 2
If the speed is slower than 0.00/min, productivity decreases and is not practical, which is not preferable.

In addition, if the melt spinning temperature is within the range of 190 to 260 qo, good fibers can be obtained without any decrease in strength, but preferably 21,000 to 260 qo.However, at the low take-up speed, The obtained undrawn drawn yarn has a low degree of orientation and is sticky, making it difficult to remove the undrawn yarn from the bobbin. It is preferable to adopt a spinning/drawing method.In this case, the stretching ratio is determined by measuring the stretching ratio at break by changing the rotation speed of the delivery roller in the stretching area, and setting the stretching ratio at break by 0.60 to 0.90. However, the stretching ratio at break is preferably xo.70 to 0.80.
An example of the apparatus used in performing the straight twill spinning and drawing is shown in FIG. 1. 1 is a spinning nozzle, 2 is an oiling roller, 3 and 5 are Nelson rollers, 4 is a hot plate, and 6 is a bobbin.

The adhesive fiber of the present invention exhibits excellent performance especially when blended with polyester woven or knitted fabrics, but it can also be applied to other woven or knitted fabrics, such as polyamide, cellulose, wool, etc. can. The adhesive fibers of the present invention can be used in various ways. For example, when weaving wide and medium woven fabrics, the adhesive fibers of the present invention are driven into the warp yarns at regular intervals, and after weaving, fixation with a hot roller or the like is performed during drying after dyeing. By cutting the fixed portion, it is possible to simultaneously produce a large amount of thin and medium tape without fraying of the edges without increasing the number of steps compared to when using conventional powdered adhesive.

It can also be applied to fields where fibrous adhesives are essential, such as preventing pile products from coming off, preventing twisting, replacing current sewing threads, replacing resin processing for industrial materials such as tents, and adhering fibers and rubber. In this way, if the process is The contribution of the hot-melt adhesive fiber of the present invention to the textile field is truly great, including physical science, labor saving, and high added value. Of course, it can also be used in the same fields as adhesives in the form of films, powders, non-woven fabrics, etc. EXAMPLES The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples.

Example 1 Dimethyl terephthalate 68 was added to a stainless steel autoclave equipped with a heating device, a thermometer, and a cooling pipe.
78 parts of dimethyl isophthalate, 3 parts of ethylene glycol
8, 236 parts of 1.4-butanediol, 0.71 parts of potassium titanate oxalate, and 0.58 parts of antimony trioxide.
After 3 hours of transesterification reaction at 170 oz to 220 qo, 0.0 oz of triphenylphosphite was added.
Add 93 parts and 161 parts of adipic acid, and heat at 220°C to 250°C.
1 at o0. An insect time esterification reaction was performed.

Next, the pressure was gradually reduced at 265 qo to remove excess glycol, and then at 265 qo, under a reduced pressure of 0.1 to 0.3 side Hg,
2. An instant polycondensation reaction was carried out. The resulting copolymerized polyester had an intrinsic viscosity of 0.90 and a melting point of 13,500. This copolymerized polyester is melted and has a solid pore count of 1 and 0 fleas.
．． Using the apparatus shown in FIG. 1 under the conditions of a discharge rate of 22.2 min/min through a melt spinneret having 33 spinning holes and a paper yarn temperature of 24,000, the speed of roller 2 was 500 thread/m.
Take it up with a drawer, and then stretch with hot roller 3 and roller 5 at a stretching ratio of 4. The film was stretched at the sound of , and wound onto bobbin 6. At that time, the temperature of the hot roller 3 was set to 5500, and the temperature of the hot plate 4 was also set to 5500. The obtained drawn yarn has a 10 plate-univalence, yarn tenacity 3.89 poly/D yarn elongation 57.8
%Met. When this drawn yarn was inserted into the selvage of a filament yarn (100D-24F) fabric made of polyethylene terephthalate, it showed good paper-making properties.

After exposing the fabric to 15 sand in an atmosphere of 150,000 yen, the temperature was 0. When pressed with a roller and fixed, there was no force due to shrinkage, there was no tangling of the edges of the fabric, and it had excellent transparency. Even after dry cleaning, it was in good condition with no fraying on the edges. Comparative Examples 1 to 5 Examples 2 to 4 Copolymerized polyesters were obtained in the same manner as in Example 1 except that the compositions shown in Table 2 were used, and each was subjected to spinning, drawing and weaving in the same manner as in Example 1.

The results are also listed in Table-2. Table 2 A copolyester style~'E) was obtained in the same manner as in Example 1 except that the composition shown in Table 1 was used.

Table 1 also shows the evaluation results of the selvage of the fabric which was subjected to spinning, drawing and weaving in the same manner as in Example 1. Table-I In Comparative Examples 1, 2, and 4, weavable yarns were obtained, but due to twisting of the edges of the woven fabric, incomplete adhesion, and non-adhesion, it was not possible to obtain a satisfactory adhesion effect. could not.

Comparative Example 3 could not be woven due to the strength of the fibers, and although ears were formed as a model using Comparative Example 3, it oozed out to areas other than the ears. Comparative Example 5 had a low intrinsic viscosity of 0.30, and fibers could not be obtained due to yarn breakage during melting paper yarn.

[Brief explanation of the drawing]

FIG. 1 shows a spinning direct drawing machine. 1...Weaving thread nozzle, 2...Oiling loaf, 3, 5...
...Nelson roller, 4...hot plate, 6...bobbin. Figure 1

Claims (1)

[Claims] 1 As dibasic acid components, 36-84 mol% of terephthalic acid or its lower alkyl ester, 14-1 mol% of isophthalic acid or its lower alkyl ester, and 50-1 mol% of aliphatic dicarboxylic acid or its lower alkyl ester.
5 mol%, consisting of 80-20 mol% ethylene glycol and 20-80 mol% 1,4-butanediol as glycol components, having an intrinsic viscosity of at least 0.5 and a melting point of 100-160°C. A hot melt adhesive fiber made of copolymerized polyester, characterized in that it has a fiber strength of 1.5 g/D or more and a fiber elongation of 10% or more.