JP2002265891A - Sealing tape and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing tape comprising a polyester tape which can be recycled and is environment friendly when combustion. SOLUTION: This sealing tape is characterized by lamenting a substrate portion comprising a polyester-based elastomer having a melting point of >=150 deg.C to an adhesive layer comprising a polyetherester-based elastomer having a melting point of 50 to 130 deg.C. The method for producing the sealing tape is characterized by coating a polyester-based elastomer film used as a substrate portion with a 2 to 30% organic solvent solution of a polyetherester-based elastomer and then removing the organic solvent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing tape comprising a polyester elastomer and having excellent adhesion, and a method for producing the same. Particularly, the present invention relates to a sealing tape suitable for waterproof clothing.

[0002]

2. Description of the Related Art A waterproof fabric comprising a fiber base fabric and a resin film,
In particular, a moisture-permeable waterproof fabric made of a moisture-permeable resin film is used for raincoats, windbreakers, and the like. When sewing these waterproof fabrics, a sealing tape is used to cover the waterproofness of the perforated portion.
As the sealing tape, a heat-fusible tape obtained by applying a thermoplastic polyolefin, a thermoplastic polyurethane, or the like to a film made of a polyolefin or a polyurethane is generally used.

[0003] However, when these resins are used as sealing tapes, there are problems such as that they cannot be recycled and that toxic gases are easily generated during combustion. In addition, when the product is washed with water, which is used in ordinary households, there is a problem that peeling or damage to the base portion occurs due to a decrease in adhesive strength, and comfort is impaired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above prior art, and has as its object to provide a sealing tape which is recyclable and which is friendly to the global environment even during combustion, and a method for producing the same. is there.

[0005]

According to the present invention, there is provided a sealing tape comprising a base portion made of a polyester elastomer having a melting point of 150 ° C. or more and an adhesive made of a polyether-ester elastomer having a melting point of 50 ° C. to 130 ° C. And the layers are stacked.

Further, the method for producing a sealing tape according to the present invention is characterized in that a polyether-ester based elastomer having a melting point of 50 ° C. to 130 ° C. is coated on a film made of a polyester elastomer having a melting point of 150 ° C. or higher. 3
The method is characterized in that after applying an organic solvent solution dissolved at 0% by weight, the organic solvent is removed.

[0007] A waterproof fabric product of the present invention is characterized in that the seam of the fabric is waterproofed using the sealing tape of the present invention.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The sealing tape of the present invention uses a polyester elastomer for the base in order to follow the irregularities of the sewn portion and to improve recyclability. Here, as the polyester-based elastomer, when a polyether-polyester-based elastomer in which the hard segment is a high melting point and high crystalline aromatic polyester and the soft segment is an amorphous polyether is used, the flexibility and the hydrolysis resistance are excellent. A sealing tape is obtained. On the other hand, when a hard segment is a high melting point high crystalline aromatic polyester, a soft segment is a polyester-polyester elastomer comprising an amorphous polyester,
A sealing tape excellent in weather resistance and chemical resistance can be obtained.

The hard segments of the polyether-ester elastomer preferably used include, for example, terephthalic acid, naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, etc. as main acid components, and ethylene glycol, propylene glycol, tetramethylene glycol, etc. And aromatic polyesters containing alkylene glycol as a main diol component.

When the diol of the hard segment is a mixture of ethylene glycol and tetramethylene glycol and the proportion of ethylene glycol in the diol is 30 mol% or more, high abrasion resistance is obtained. Can be secured.

On the other hand, the amorphous polyether of the soft segment includes polyethylene glycol, poly-1,2-
And polyalkylene glycols such as propylene glycol, poly-1,3-propylene glycol, polytetramethylene glycol, a copolymer of ethylene oxide and propylene oxide, and a copolymer of ethylene oxide and tetrahydrofuran. If the number average molecular weight of the polyalkylene glycol is too small, it is difficult to obtain sufficient mechanical properties, and if it is too large, phase separation is likely to occur, making it difficult to adjust the polyether-polyester elastomer. Is appropriate.

Although the moisture permeability improves as the amount of the polyethylene glycol component in the soft segment increases, the water resistance tends to decrease if the amount is too large, and the washing resistance also tends to decrease. It is important to set the ratio, and it is particularly desirable that the content of polyethylene glycol be 25% by weight or less based on the total weight of the polyether-ester-based elastomer.

Next, the polyester preferably used is
The hard segment of the polyester elastomer is an aromatic polyester composed of an aromatic dicarboxylic acid and a diol, for example, polybutylene terephthalate composed of terephthalic acid and 1,4-butanediol. On the other hand, as the soft segment, for example, isophthalic acid, a long-chain diol component such as hexamethylene glycol, octamethylene glycol or 2-methyl-
Aromatic polyesters comprising a diol component having a side chain such as 1,5 heptanediol, aliphatic polyesters comprising an aliphatic carboxylic acid such as adipic acid and sebacic acid and a diol component such as tetramethylene glycol and diethyl glycol. No.

The weight ratio of the soft segment to the hard segment in the polyester elastomer of the base portion is suitably in the range of 25/75 to 75/25. Further, various stabilizers, ultraviolet absorbers, and the like may be blended in the polyester elastomer as needed.

It is necessary that the melting point of the polyester elastomer in the base portion is 150 ° C. or higher. Most preferably, it is 250 ° C or lower, more preferably 170 to 230 ° C. When the melting point of the elastomer in the base portion is low, the base portion tends to dissolve during thermal bonding between the sealing tape and the fabric.

The thickness of the base portion is not particularly limited, but is preferably 5 to 100 μm in consideration of handleability.
Further, the thickness is preferably 10 to 50 μm.

Further, the polyester-based elastomer of the base portion used in the present invention is obtained by forming a film having a thickness of 15 μm formed from the polyester-based elastomer at a water temperature of 40 ° C.
It is preferable that the area swelling ratio after the treatment for 30 minutes is less than 5%. In the case of a film having an area swelling ratio of 5% or more, water resistance tends to decrease due to washing with water.

The adhesive layer of the sealing tape of the present invention is a polyether-ester elastomer. The polyether-polyester-based elastomer of the adhesive layer has a high melting point and a high crystalline aromatic polyester for the hard segment and an amorphous polyether for the soft segment, as described in the base section.

Further, the melting point of the polyether-ester elastomer of the adhesive layer must be 50 ° C. or more and 130 ° C. or less, and more preferably 70 to 110 ° C. from the viewpoint of workability. If it exceeds 130 ° C,
It becomes difficult to bond the sealing tape under the conditions normally used, or the efficiency of the heat treatment step is reduced. If the temperature is lower than 50 ° C., the solidification does not take place at room temperature, so that the handleability is deteriorated. Furthermore, it is preferable that the melting point of the elastomer in the base portion is lower by 40 to 100 ° C. The adhesive layer may contain a small amount of a solvent. However, when the adhesive layer is stored by winding or stacking, the organic solvent content is 2%.
Preferably, it is less than about 10% by weight.

The coating weight of the elastomer of the adhesive layer is preferably 5 to 100 g / m ^2, more preferably a 10 to 50 g / m ^2. If it is less than 5 g / m ² , the adhesive strength to the uneven fabric tends to decrease, and
/ M ² , the texture tends to deteriorate.

The peel strength of the sealing tape of the present invention is 5 N /
2.54 cm or more, and further 8 N / 2.5
It is preferably at least 4 cm. The peel strength after washing with water 10 times is preferably 5 N / 2.54 cm or more, and more preferably 7 N / 2.54 cm or more. This peel strength is the peel strength when the sealing tape is heat-sealed to the polyester fabric as described later.

The method for producing the above-mentioned sealing tape of the present invention is not particularly limited, but for example, it can be produced by the following method. That is, this is a production method in which an organic solvent solution in which a polyether-ester elastomer is dissolved is applied to a film made of a polyester elastomer, and then the organic solvent is removed.

More specifically, first, a film made of a polyester-based elastomer having a melting point of 150 ° C. or more as a base portion is prepared. As the polyester-based elastomer film, the aforementioned polyether-ester-based elastomer or polyester-ester-based elastomer used for the base portion is used. The film can be formed by any conventionally known method, for example, by melt extrusion or by dissolving in an organic solvent and casting by solvent casting.

Next, the melting point of the adhesive layer is 50 ° C. or more and 13 ° C.
A solution prepared by dissolving a polyether-ester based elastomer at 0 ° C. or lower in an organic solvent is prepared. Preferred organic solvents include dimethylformamide, dioxane, 1,3-dioxolan, toluene, chloroform,
Methylene chloride may be used, and two or more kinds may be used in combination.
Among them, 1,3-dioxolane is preferred because of its low boiling point and low toxicity, and particularly preferred is one in which 80% or more, based on the weight of the organic solvent, is 1,3-dioxolane. At this time, the polyether-ester-based elastomer is dissolved in an amount of 2 to 30% by weight based on the weight of the solvent, and more preferably 5 to 25% by weight is dissolved from the viewpoint of workability. The temperature during melting is 50
~ 65 ° C is suitable for easy operation.

Then, a solution in which a polyether-ester type elastomer is dissolved is applied on a film serving as a base portion. As a method of applying, any coating method,
For example, a knife coater and a gravure coat can be adopted. For the removal of organic solvents such as 1,3-dioxolane, a dry method of removing the solvent under dry heat at 70 to 120 ° C., preferably 70 to 100 ° C. may be employed. At this time, if the amount is small, the organic solvent may remain, but it is preferable to remove the organic solvent so that the organic solvent content is less than 2% by weight.

A cloth may be adhered to the obtained sealing tape on the opposite side of the base from the adhesive layer in order to improve the quality. In addition to the sealing of the sewn product, it can also be used as a material for applying a repair portion of the sewn product, a hemming tape, a patch, an emblem, and the like.

The obtained sealing tape is used after being cut into a size suitable for the intended use. At this time, it is not necessarily limited to the tape-like form, and it may be used after being cut into sheet-like small pieces. At the time of use, the sealing tape is brought into contact with the adherend, and adhered by a known method such as hot pressing, hot air, ultrasonic wave, or high frequency. For example, in a hot press, bonding is performed by heating for a predetermined time at a temperature equal to or higher than the melting point of the elastomer in the adhesive layer and equal to or lower than the melting point of the elastomer in the base portion. Examples of the heating method of the hot press include a method using a heating calender, an iron, a hot press, a hot air machine, and the like.

The waterproof fabric sewn product of the present invention is characterized in that the seam of the fabric is waterproofed by using the above-described sealing tape. The fabric having a sewn portion is not particularly limited, and may be any fabric. However, a fabric in which one side or both sides of a base fabric are coated with a resin is preferable because a product having particularly excellent waterproofness can be obtained. The base fabric is arbitrarily selected from a woven fabric, a knitted fabric, and a nonwoven fabric made of synthetic fibers and natural fibers, and is particularly preferably made of a polyester synthetic fiber such as polyethylene terephthalate. The resin for coating the base fabric is preferably a polyester resin, for example, a resin coated with a polyether-ester resin. Since all the members of the cloth and the sealing tape are made of polyester by using the cloth made entirely of polyester resin, the recyclability of the entire sewn product is improved. In addition, since the adhesive layer of the sealing tape of the present invention is a polyester-ether-based elastomer, it has a high affinity for polyester, and when the cloth is entirely made of a polyester-based resin, the polyester fiber as a base cloth and the polyester-based resin as a coating layer. Adhesion to any of them is high.

More specifically, a high-density woven fabric having a cover factor (CF) of 1500 to 4000 using single-filament fineness of 0.5 to 5 dtex, for example, may be used as a polyether-ester type fabric. It is a moisture-permeable waterproof fabric coated with an elastomer. By using the sealing tape of the present invention in the sewn portion, a product excellent in recyclability and having both quality and texture can be obtained. Where CF
Is the square root of (filament fineness (dtex) × 9/10) × the number of warp-in (number / 2.54 cm) + the square root of (weft filament fineness (dtex) × 9/10) ×
This is the number of wefts (number / 2.54 cm).

[0030]

The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. In the examples, the measurement of each physical property value is performed by the following method,
The elastomer used in the examples was produced by the method of the reference example. In the examples, "parts" represents "parts by weight".

(1) Melting point Differential scanning calorimeter (D manufactured by TA instrument)
SC29290) at a heating rate of 10 ° C./min in a nitrogen stream.

(2) Peel strength The binder surface of the sealing tape (2 cm width × 9 cm length) and the polyester fabric are separated by a hot calender at a predetermined temperature.
A test piece was prepared by applying a linear pressure of 00 N / cm and performing heat fusion. Then, referring to JIS K-6301, a cloth adhesive tape of the same size as the tape surface of the test piece (Nitto Denko No. 7
50) were adhered by a mangle and pressed by a mangle under the condition of 1 kPa / cm ² , and then the test piece and the cloth adhesive tape were placed between chucks (20 m) facing each other of a tensile tester.
m), the base cloth and the coating layer were peeled off by increasing the distance between the chucks at a pulling speed of 50 mm / min, the average stress excluding the initial peeling was read, and the sample width 25.4 mm (1 inch) ) Was calculated as the peel strength. When the cloth adhesive tape was peeled off without breaking the test piece, it was described as "10>". The polyester fabric used was a warp of 62 dtex / 36 fill, the number of shots was 122 / 2.54 cm, and the weft was 92 dtex /
A 72-fil, 97-piece / 2.54 cm plain weave was used.

(3) Peeling strength after washing 10 times (after peeling strength L10) The washing operation specified in JIS L 0217, Appendix Table No. 103, is defined as 1 cycle (1 time), and 10 cycles (10 times) ) Was repeated (L10), and then the peel strength test (2) was performed.

(4) Area swelling ratio A film having a size of 10 cm (width) × 10 cm (width) × 15 μm (thickness) was prepared and immersed in water at 40 ° C. for 30 minutes.
The area swelling ratio was calculated by the following equation. Swelling rate (%) = (area after immersion / area before immersion-1) × 10
0

Reference Example 1 (Preparation of elastomer film for base portion having a melting point of 190 ° C.) 194 parts of dimethyl terephthalate (DMT), 115 parts of tetramethylene glycol (TMG), polytetramethylene glycol (PTMG) (average molecular weight: 2000) )
124 parts and tetrabutyl titanate 0.1 as a catalyst.
391 parts were charged into a reaction vessel equipped with a distillation apparatus, and the reaction product was subjected to transesterification at 220 ° C. for 210 minutes in a nitrogen gas atmosphere while removing methanol generated in the reaction vessel outside the system. After completion of the transesterification reaction, the transesterification reaction product was transferred to a reaction vessel heated to 240 ° C. equipped with a stirrer, a nitrogen inlet, a vacuum port, and a distillation apparatus, and Sumirizer GS (Sumitomo) was added to the reaction mixture as a heat stabilizer. Chemical industry
0.31 part) was added and purged with nitrogen, and then at normal pressure for about 10 minutes, at 1995 to 2660 Pa (15 to 20 mmH).
g) for about 30 minutes, and 13.3 Pa (0.1 mmHg)
To 255.degree. C. to carry out a polycondensation reaction and reach a predetermined melt viscosity.
The reaction was terminated by adding 0.62 parts of -80 (manufactured by Sumitomo Chemical Co., Ltd.), and formed into chips by a conventional method. The melting point of the obtained polyether-ester elastomer was 190 ° C. This polyester-based elastomer was formed into a 50 μm film on release paper by a known melt extrusion method. The area swelling ratio of a 15 μm-thick film formed from this elastomer with water was 0%.

Reference Example 2 (Preparation of elastomer film for base portion having a melting point of 192 ° C.) 180 parts of dimethyl terephthalate, 20 parts of dimethyl sebacate, 140 parts of tetraethylene glycol and 30 parts of diethylene glycol were esterified with a dibutyltin diacetate catalyst. After the exchange reaction, polycondensation was performed under reduced pressure to obtain a polyester (S, soft segment).

After drying chips of polybutylene terephthalate (H, hard segment) to the polyester (S), adding 170 parts and reacting at 240 ° C. for further 45 minutes, 0.1 parts of phenylphosphonic acid was added. The reaction was stopped by addition. The melting point of this polyester-ester elastomer was 192 ° C. This polyester-based elastomer is put on a release paper by a known melt extrusion method for 50 minutes.
A μm film was formed. The area swelling ratio of a 15 μm-thick film formed from this elastomer with water was 0%.

Reference Example 3 (Preparation of elastomer film for base portion having a melting point of 145 ° C.) 210 parts of dimethyl terephthalate (DMT), 63.6 parts of isophthalic acid (IA), 193.3 parts of tetramethylene glycol (TMG) And 199 parts of polytetramethylene glycol (PTMG) were charged into a reaction vessel,
A transesterification reaction was performed to obtain a monomer. PTMG having an average molecular weight of 1500 was used. As a result of performing polymerization in the same manner as in Reference Example 1, a polyether-ester elastomer having a melting point of 145 ° C. was obtained. 50 μm of this polyester elastomer is formed on release paper by a known melt extrusion method.
Was formed.

Reference Example 4 (Production of an Elastomer for an Adhesive Layer with a Melting Point of 107 ° C.) 31.5 parts of dimethyl isophthalate (IMT), 18.1 parts of tetramethylene glycol (TMG) and 32 parts of polytetramethylene glycol (PTMG) 32 .7 parts were charged in a reaction vessel, and a transesterification reaction was performed to obtain a monomer. Thereafter, a polycondensation reaction was performed while raising the temperature and reducing the pressure to obtain a polyether-ester elastomer. PTMG having a number average molecular weight of 1,000 was used. The melting point of this polyether-ester elastomer was 107 ° C.

[Examples 1 and 2] The film obtained in Reference Examples 1 and 2 was used as a substrate, and Reference Example 4 was formed on the film.
Was completely dissolved in 75 parts of 1,3-dioxolane heated to 60 ° C.
A gravure coater of No. 32 was applied onto the films obtained in Reference Examples 1 and 2 so as to have a solid content of 10 g / m ^2, and the solvent was adjusted at 80 ° C. so that the organic solvent content was 2% by weight or less. Removal was performed.

Table 1 shows the adhesiveness of the obtained sealing tape when the calendar temperature was 140 ° C. Further, using a yarn having a single fiber fineness of 1.7 dtex for warp and 1.3 dtex for weft and a cover factor (CF) of 1800, a polyester high-density woven fabric (warp 62 dtex / 36 fil,
Number of implants 122 / 2.54cm, 92dtex weft
/ 72 fill, 97 pieces / 2.54 cm plain weave), a moisture-permeable waterproof fabric obtained by laminating a polyether-ester-based elastomer, and a waterproof fabric product using this sealing tape in a sewn portion is excellent in texture, The product had good recyclability.

Example 3 The basis weight of the adhesive layer was 7 g / solid.
A sealing tape was prepared in the same manner as in Example 1 except that the coating was performed so as to obtain m ² . 140 ° C calendar temperature
Table 1 also shows the adhesiveness of the obtained sealing tape.

Comparative Example 1 A sealing tape was prepared in the same manner as in Example 1 except that the film obtained in Reference Example 3 was used as a substrate. Calendar temperature 130
Table 1 also shows the adhesiveness of the obtained sealing tape at a temperature of 150 ° C. and 150 ° C.

Comparative Example 2 A sealing tape was prepared in the same manner as in Example 1 except that the melting point of the adhesive layer was changed to that shown in Table 1. Table 1 also shows the adhesiveness of the obtained sealing tape when the calendar temperature was set to 150 ° C. and 170 ° C.

[0045]

[Table 1]

[0046]

Since the sealing tape of the present invention is composed only of a polyester elastomer, it can be easily incinerated at the time of disposal. Moreover, it is an excellent sealing tape which has high adhesive strength even after washing with water and can be washed at home. Further, an excellent sealing tape can be provided by the production method of the present invention.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09K 3/10 C09K 3 / 10Z // C08L 67:00 C08L 67:00 F term (reference) 4D075 CA47 DA04 DB48 DC50 EA35 EB35 EB37 4F006 AA35 AB35 BA01 CA00 DA04 4H017 AA03 AB13 AC04 AC17 AD06 AE05 4J004 AA15 AB03 CA06 CC02 FA08 FA10 GA01

Claims (6)

[Claims] 1. A base made of a polyester elastomer having a melting point of 150 ° C. or higher, and a base having a melting point of 50 ° C. or higher.
A sealing tape characterized by being laminated with an adhesive layer made of a polyether-ester-based elastomer having a temperature of not more than ° C. 2. The polyester-based elastomer of the base portion is a polyether-ester-based elastomer.
The sealing tape described in 1. 3. The polyester-based elastomer of the base portion is a polyester-ester-based elastomer.
The sealing tape described in 1. 4. A film comprising a polyester elastomer having a melting point of at least 150 ° C.
A method for producing a sealing tape, comprising applying an organic solvent solution in which a polyether-ester elastomer having a temperature of 30 ° C. or lower is dissolved at a concentration of 2 to 30% by weight, and removing the organic solvent. 5. The organic solvent is dimethylformamide,
The method according to claim 4, wherein the method is dioxane, 1,3-dioxolan, toluene, chloroform, methylene chloride, or a mixture thereof. 6. Using the sealing tape according to claim 1,
A waterproof fabric sewn product, wherein a sewn portion of the fabric is waterproofed.