JPS60209039A - Sewing yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible, stretchable and highly transparent sewing thread made of a thermoplastic elastomer, particularly a specific polyester/polyether elastomer.

In response to the rise in quality, various materials are used singly or in combination, and with a variety of colors and patterns, there are an extremely large number of laminated materials. The types of sewing threads used for this purpose are increasing every year, and in particular, there are more than 4,400 colors of sewing thread on the market that match the colors of the sewing fabrics, and the selection of compatible threads has become complicated. It is necessary to keep inventory, which increases costs. In order to eliminate this situation as much as possible, we used transparent sewing thread,
Attempts have been made to reduce the number of sewing thread types by expanding the range of colors that are compatible with sewing fabric colors. Conventionally, the fibers used in sewing threads for this purpose are continuous filament yarns with a reduced amount of polyamide or polyester matting agents, and the single fiber fineness of the constituent fibers can be increased to improve transparency. It was done. However, the fibers used in the past have a high Young's modulus, and when the fineness is increased, they become extremely coarse and hard sewing threads, which generally cannot be used for apparel fabrics where texture is important, and some of them have been rejected. In addition, sewing threads with a low twist count by increasing the fineness of the single fibers to some extent and crimping them to give them flexibility have been considered, but the transparency is poor and the range of compatible colors is extremely narrow. Ta.

The purpose of the present invention is to provide a highly flexible sewing thread that overcomes the drawbacks of the conventional sewing thread by using a special thermoplastic synthetic fiber and having an appropriate fineness configuration, and has extremely excellent transparency. .

The present invention has the following configuration to achieve the above object.

That is, the present invention provides a polyester comprising 60-97% by weight of a polyester component containing 60% by weight or more of tetramethylene terephthalate units based on the polyester component and 40-3% by weight of a polyalkylene ether glycol component containing 60% by weight or more of tetramethylene terephthalate units. This sewing thread is composed of fibers made of a polyether polyester copolymer, and is characterized by having a single fiber fineness of 7 denier or more and a total fiber resistance of 20 to 2000 denier.

An important feature of the present invention is the use of a specific polyester/polyester copolymer for the fibers that make up the thread. The Prusk copolymer contains 6.0 mol% or more of tetramethylene terephthalate units,
It is a four-block copolymer in which the hard segment is preferably a polyester component containing 80 mol% or more, and the soft segment is a polyether containing 60 mol or more, preferably 80 mol% or more, of polytetramethylene ether glycol units. As a polyester component, in addition to polytetramethylene terephthalate units, one or more types of polymethylene tereathate units, polypropylene terephthalate units, polyethylene isophthalate units, etc. are copolymerized in a proportion of up to 40 mol%. Good too. In addition, as a polyether component, in addition to polytetramethylene ether glycol units, up to 40 mol% of one or more of polyethylene ether glycol units, polyalkylene ether glycol units, polyhexamethylene ether glycol units, etc. are copolymerized. may have been done. The copolymerization components of the hard segment and the soft segment are not limited to those exemplified above, and in particular, areophthalic acid, dimer acid, 3,5-
A product using a metal salt of di(carbomethoxy)benzenesulfonic acid as a copolymerization component is practically useful in terms of cost reduction or improvement in dyeability when a copolymerization component is used.

Among these, the most preferred is a polyester-polyether block copolymer having polytetramethylene tereate as a hard segment and polytetramethylene ethyl glycol as a soft segment.

The copolymerization ratio (weight) of the aromatic polyester as a hard segment and the polyalkylene ether glycol as a soft segment is 60:40 to 97:
It is necessary that the range is 3, more preferably 80:
20-95:6 is good.

It is characterized by a large amount of hard segments compared to the copolymerization ratio used for chemical products. The reason for this is that when used as a sewing thread, when the amount of soft segments exceeds a copolymerization ratio of 40% by weight, the Young's modulus decreases significantly, making needle thread loop formation unstable during sewing, resulting in skipped stitches, and stretching and sewing. The disadvantage is that puckering tends to occur due to elongation recovery after sewing. Further, if the amount of soft segments is less than 3 weight, the stiffness of the sewing thread becomes large, and it becomes impossible to increase the single fiber fineness and improve transparency. In addition, the number average molecular weight of the polyalkylene ether glycol increases the melting point of the fiber, and
500-400G to give the sewing thread appropriate flexibility
is suitable, and more preferably 1000 to aooo.

Additionally, antioxidants, light stabilizers, flame retardants, etc. may be added to the polyester/polyether Plug copolymer as necessary, but in order to provide transparency, the matting agent should not be added or should be added in as little amount as possible. The polyester/polyether pull copolymer which is the constituent fiber of the sewing thread of the present invention has been described in detail above, but one of the more important requirements for the present invention is that the fineness of the single fibers constituting the sewing thread is 7. The total fineness is in the range of 20 to 2000 deniers.

The reason why the single fiber fineness is limited to 7 denier or more is that the fineness is closely related to the transparency of the sewing thread, which is the object of the present invention. In order to provide good transparency, it is necessary to make it at least 7 denier.

In addition, the reason for limiting the total fineness of the sewing thread is that if the total fineness is less than 20 denier, sufficient practical stitch strength cannot be maintained as a sewing thread.
This is because if it exceeds 2000 denier, the sewing thread becomes thick and loses its transparency effect.

As described above, the present invention is a sewing thread obtained by melt-spinning and drawing a specific polymer to have an appropriate fineness configuration, and has excellent flexibility and transparency that could not be produced conventionally, and can be used in a wide range of colors and patterns. It is suitable for sewing fabrics, and can greatly reduce the stock of sewing thread.

In addition to being used colorless, the sewing thread of the present invention can also be dyed with standard colors such as blue, red, yellow, etc., and used to match sewing fabrics of similar colors.

Example 1 1.4-butanediol in an equivalent amount to pyrolytic acid (TPA) and tetramethylene ether glycol (PTG) with a number average molecular weight of too much were mixed so that the TPA/PTG molar ratio was 50.0. Prepare an antioxidant (Bionox 3301, a product manufactured by Ciel Oil Co., Ltd.).

Name) 0.115% by weight, charged in an autoclave with catalyst O and OS% by weight, heated under stirring to 140-23%
The temperature was raised to 0°C to carry out transesterification, and the methanol produced was distilled out of the prefecture. After that, depressurize 240
The temperature was raised to ℃ and held for 100 minutes to perform polymerization, and the melting point was 2.
A polyester/polyether Plutsch copolymer A was obtained at 20°C. The PTG content in this copolymer was 10% by weight. This block valve type composite was melt-spun and drawn using a screw extruder at a spinning temperature of 255°C to obtain a monofilament yarn of 105 denier.

Thereafter, the monofilament yarn was heat set at 180°C for 0.5 seconds, and a smoothing agent mainly composed of silicone was applied to the monofilament yarn for 1.5 seconds.
A sewing thread was prepared by attaching 5% by weight.

The sewing thread thus obtained is flexible despite the use of monofilament thread, has excellent transparency, and is a polyester-cotton blend spun thread (Ne45") in different colors of blue, red, and yellow.
I sewed the fabric I was using, but the color of the fabric came through through the sewing thread, giving it a beautiful sewn appearance. For comparison, 102
When a sewing test similar to the above example was conducted using a commercially available sewing thread made of denier colorless nylon 6 monofilament thread, the sewing thread was hard and the sewn fabric had a wavy appearance, which was inferior to that of the example. Ta.

Example 2 A filament yarn having a total denier of 75 denier and having a polytetramethylene ether glycol (PTG) content of 2.5, 16.35.50% by weight in a polybutylene terephthalate/polyether copolymer was made into a single fiber denier. Melt spinning was performed with changes as shown in Table 1. Thereafter, each filament was made into a sewing thread. Using the obtained sewing thread,
Polyester filament) 50 denier printed plain fabric is sewn using a lockstitch sewing machine to improve transparency (transparency of printed pattern), seam appearance (degree of puckering, seam defects such as skipped stitches, etc.) Cleanliness) and tactile sensation (flexibility of the seam portion and tingling sensation when the thread was broken when touched with the hand) were evaluated as Excellent ◎, Good or Bad. The results are shown in Table 1.

(Table 1) As shown in the table above, a single fiber denier of 5 d has insufficient transparency, and when the PTG content is 2% by weight, the thicker the single fiber denier, the harder the filament yarn becomes, causing puckering to occur easily and causing yarn breakage. It becomes a tingling sensation, and PTG
Those with a content of 50% by weight have a low modulus and are easy to stretch.
Seam formation was interrupted, skipping occurred, and the seam appearance was poor.

PTG content within the scope of the present invention: 15.15.35% by weight
, monofilament Denny/I/15d, 75d is transparent,
The seam appearance and feel were both good.

Patent applicant: Toyobo Co., Ltd.

Claims (1)

[Claims] Polyester component 60 containing 60 mol% or more of tetramethylene terephthalate units based on the polyester component
-97% by weight of polyester polyether glycol and 40 to 3% by weight of a polyalkylene ether glycol component containing 60 mol% or more of polytetramethylene ether glycol units based on the polyalkylene ether glycol component. A sewing thread comprising: a single fiber fineness of 7 deniers or more and a total fineness of 20 to 2'000 deniers.