JPH04361612A - Polyester fiber having excellent comfortableness - Google Patents

Abstract

PURPOSE:To provide the subject fiber comprising a blend of a fiber-forming polyester with a specific amount of a polyether ester amide, having good fiber physical properties, moisture-absorbing characteristics, a high commercial value, etc., and useful for underwears, sports wears, etc. CONSTITUTION:The objective fiber comprising a blend of (A) a fiber-forming polyester (preferably a modified polyethylene terephthalate copolymerized with a sulfonate compound) with (B) a polyether ester amide produced by polycondensing (i) a polyamide-forming component such as a lactam with (ii) a polyetherester-forming component comprising a dicarboxylic acid and a poly(alkylene oxide) glycol, is characterized in that the polyether ester amide is contained in an amount of 5-30wt.% (preferably 10-22wt.%) based on the total amount of the fibers.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a polyester blend fiber that has excellent moisture absorption properties, and more specifically, it is a comfortable polyester blend fiber that can be particularly suitably used for clothing materials such as innerwear, innerwear, and sports clothing. This invention relates to polyester blend fibers with excellent properties.

0002

[Prior Art] Polyester fibers represented by polyethylene terephthalate or polybutylene terephthalate have excellent mechanical strength, chemical resistance, heat resistance, etc.
It is widely used mainly for clothing and industrial purposes. However, these polyester fibers have extremely low hygroscopicity, so when used in areas that come into direct contact with the skin or are worn close to the skin, such as innerwear, innerwear, and sports clothing, , sweating from the skin causes stuffiness, stickiness, etc., and the comfort is inferior to that of natural fibers, so in reality, their expansion into these fields is limited. For this reason, for example,
As described in Publication No. 5, Japanese Utility Model Publication No. 60-40612, or Japanese Unexamined Patent Publication No. 60-215835, various types of blending, blending, and pulling together with fibers having a high equilibrium moisture content (moisture absorption rate) Attempts to provide comfort as a fabric have been proposed. Although the use of these methods certainly improves comfort, the effects cannot be said to be sufficient, and conversely, they may cause staining due to the disperse dyes used to dye polyester during dyeing, have poor same color properties, or cause problems with the inherent physical properties of polyester. There was a problem that the physical characteristics were lost.

[0003]Also, a method is known in which hygroscopicity is imparted to polyester fibers by graft polymerizing acrylic acid or methacrylic acid and further substituting their carboxyl groups with alkali metals after graft polymerization.
Polyester is a material that is difficult to graft polymerize,
Moreover, it has not been put into practical use because it has the potential to deteriorate color fastness, light fastness, fiber physical properties, texture, etc.

[0004] As described above, methods of imparting hygroscopicity at the post-processing stage have various problems during dyeing or in terms of the properties of the resulting fabric. In order to eliminate the
Publication No. 30010 proposes a method of copolymerizing or mixing polyoxyalkylene glycols. However, with this method, even if a large amount of polyoxyalkylene glycol is blended, the improvement in hygroscopicity is relatively small, and it is necessary to blend a fairly large amount to obtain sufficient hygroscopicity, resulting in a decrease in fiber properties such as strength and elongation. The problem was that it was large.

[0005]

[Problems to be Solved by the Invention] It is an object of the present invention to overcome the problems of the prior art, to provide fibers with good physical properties, high commercial value, good moisture absorption properties, and comfortable to wear when made into clothing. The purpose of the present invention is to provide a polyester blend fiber with excellent properties.

[0006]

[Means for Solving the Problems] The object of the present invention is to provide a blend fiber of a fiber-forming polyester and a polyether ester amide, in which the amount of the polyether ester amide is 5 to 30% by weight of the total weight of the fiber. It is characterized by excellent comfort that can be achieved by polyester fibers.

[0007] The polyether ester amide in the present invention is a block copolymer having an ether bond, an ester bond, and an amide bond within the same molecular chain. More specifically, one or more polyamide-forming components (A) selected from lactams, aminocarboxylic acids, salts of diamines and dicarboxylic acids, and a polyether ester consisting of a dicarboxylic acid and poly(alkylene oxide) glycol. This is a block copolymer obtained by polycondensation reaction of the forming component (B). The polyamide-forming component (A) of the polyether ester amide of the present invention includes caprolactam, enantlactam, dodecanolactam,
Lactams such as undecanolactam, ω-aminocarboxylic acids such as aminocaproic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid, nylons of diamine-dicarboxylic acids that are precursors of nylon 66, nylon 610, nylon 612, etc. There are salts, and these can be used alone or in combination of two or more. A preferred polyamide-forming component is ε-caprolactam, nylon 66 salt.

On the other hand, the polyetherester component (B) constituting the soft segment of polyetheresteramide
It consists of a dicarboxylic acid having 4 to 20 carbon atoms and poly(alkylene oxide) glycol. Carbon number 4-2
Examples of the dicarboxylic acids of 0 include aliphatic dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, and dodecadiic acid, and aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid. Examples include alicyclic dicarboxylic acids such as dicarboxylic acid and 1,4-cyclohexanedicarboxylic acid, which can be used singly or in combination of two or more. Preferred dicarboxylic acids are adipic acid, sebacic acid, dodecadiic acid, terephthalic acid, and isophthalic acid. In addition, poly(alkylene oxide) glycols include polyethylene glycol, poly(1,2- and 1,3-propylene oxide) glycol, poly(tetramethylene oxide) glycol,
Examples include poly(hexamethylene oxide) glycol, random or block copolymerization of ethylene oxide and propylene oxide or tetrahydrofuran, and polyethylene glycol is particularly preferred. The number average molecular weight of poly(alkylene oxide) glycol is 300 to 1
0,000, preferably in the range of 500 to 4,000.

The polyether ester amide block copolymer of the present invention can be obtained by polycondensing the above-mentioned polyamide-forming component (A) and polyether ester-forming component (B). The industrially preferred method is (
One example is a method of heating and polycondensing A) and (B) under reduced pressure. At that time, in order to obtain a polymer with a high degree of polymerization and little coloring, for example, antimony oxide, titanate ester, etc. are used as a polycondensation catalyst. Further, it is preferable to add phosphoric acid, phosphoric acid ester, etc. as a coloring preventive agent. The weight ratio of (A) and (B) in the polyether ester amide is 99:
1-5:95, preferably 80:20-10:90
It can be used effectively within the range.

The fiber-forming polyester resin in the present invention is not particularly limited, but includes, for example, terephthalic acid, 2,
Examples include linear polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene 2,6-naphthalate, which have 6-naphthalene dicarboxylic acid or an ester thereof as the main dicarboxylic acid component and ethylene glycol or tetramethylene glycol as the main glycol component. . Among these, polyethylene terephthalate is preferred, and modified polyethylene terephthalate copolymerized with a sulfonate compound is particularly preferred because it has good compatibility with polyether ester amide and can be finely dispersed in each other. Preferred sulfonate compounds as copolymerization components of the modified polyester are 5-sodium sulfoisophthalic acid, 5-(tetraalkyl)phosphonium sulfoisophthalic acid and their ester derivatives, sodium p-hydroxyethoxybenzenesulfonate, 2, Examples include potassium 5-bis(hydroxyethoxy)benzenesulfonate. The copolymerization amount of the sulfonate compound is preferably 0.1 to 7 mol %, more preferably 0.1 to 7 mol % based on the acid component, considering the compatibility with the polyether ester amide and the physical properties of the resulting blended fiber. It is 2 to 6 mol%, particularly preferably 0.5 to 5 mol%.

[0011] Further, a part of the dicarboxylic acid component of the linear polyester may be further added to a dicarboxylic acid such as adipic acid or isophthalic acid or an ester thereof, p-oxybenzoic acid,
Oxycarboxylic acids such as p-β-oxyethoxybenzoic acid or esters thereof may be substituted, and some of the aliphatic glycols may be replaced with bisglycols such as 1,4-bis(β-oxyethoxy)benzene and bisphenol A. Glycols such as ether and polyalkylene glycol may be substituted. Furthermore, a small proportion of a chain branching agent such as pentaerythritol, trimethylolpropane, trimellitic acid, trimesic acid, etc. may be used.

In the blend fiber of the present invention, polyether ester amide is the main moisture-absorbing component, and the amount of polyether ester amide is 5 to 30% of the total weight of the blend fiber.
It needs to be in weight%. Preferably 7 to 25% by weight,
More preferably, it is 10 to 22% by weight. If it is less than this range, sufficient hygroscopic properties cannot be obtained, which is not preferable, and if it is more than this range, the physical properties of the fiber deteriorate, which is not preferable.

[0013] In addition, the polyester fiber of the present invention includes:
Sodium polyacrylate, polyN vinylpyrrolidone, polyacrylic acid and its copolymers, polymethacrylic acid and its copolymers, polyvinyl alcohol and its copolymers, polyacrylamide and its copolymers, crosslinked polyethylene oxide polymers Moisture and water-absorbing substances such as, polyolefin, polyamide, and other general-purpose thermoplastic resins may be contained to an extent that does not impede the object of the present invention. Furthermore, in addition to pigments such as titanium oxide and carbon black, conventionally known antioxidants, anti-coloring agents, light-fastening agents, antistatic agents, etc. may also be added.

The polyester fiber of the present invention is a blend of a fiber-forming polyester resin and a polyether ester amide. Polyester, which originally has low moisture absorption,
By blending polyether ester amide, which has high hygroscopic properties and has an ester bond and has a high affinity with polyester, the hygroscopic properties can be enhanced without impairing the excellent mechanical properties of polyester fibers. This moisture absorption property is much higher than that of poly(alkylene oxide) glycol, polyether ester, or polyamide alone or in combination.

[0015] Here, the moisture absorption property as used in the present invention is 30°C.
Moisture absorption rate under ×90%RH environment and 20℃×65%RH
It is the difference in moisture absorption rate (ΔM) from the moisture absorption rate under the environment of Conventionally, the comfort of textile materials has been discussed at most in terms of moisture absorption rate under standard conditions, ie, in an environment of 20° C. and 65% RH. However, according to the inventors' study, when clothing is normally worn, it has already reached the standard moisture absorption rate, so when discussing comfort when worn, it is important to consider light to medium work or light to medium exercise. When doing this, we found it necessary to pay attention to the driving force that quickly releases the moisture inside the clothes to the outside air. The index of this driving force is the moisture absorption rate difference (△M) of the present invention, which is 20% different from the inside environment of clothes, typically 30°C x 90% RH, during light to medium work or light to medium exercise. This is the difference in moisture absorption rate from the outside air environment, which is represented by ℃ x 65% RH. When ΔM is less than 1.2%, sufficient wearing comfort cannot be obtained.

The polyester blend fiber of the present invention is
It can be obtained by the following method. Examples include a method in which polyester and polyether ester amide are mixed in the form of pellets and then melt-spun as is, and a method in which polyester and polyether ester amide are melt-kneaded in an extruder, pelletized, and then melt-spun. Here, the cross-sectional shape of the polyester blend fiber is not limited to a round shape, but may also be a polygonal, H-shaped, Π-shaped or other irregular cross-sectional shape, and the thread-like form may be either a filament or a staple. The form of the fabric may be appropriately selected depending on the purpose, such as woven fabric, knitted fabric, or non-woven fabric.

[0017]

EXAMPLES The present invention will now be explained in more detail with reference to Examples. In addition, each characteristic value in an Example was calculated|required by the following method. A. Intrinsic viscosity of polyester [η] Determined as an orthochlorophenol solution at 25°C. B. Difference in moisture absorption rate of fibers △M The moisture absorption rate is the weight at absolute dry time and 20℃ when the fiber is a tube-knitted fabric.
x 65% RH or 30°C x 90% RH atmosphere,
It was determined by the following formula from the weight change with the weight after being left in a constant temperature and humidity chamber (Tabai PR-2G) for 24 hours. Moisture absorption rate (%) = (weight after moisture absorption - weight when completely dry) x 100 20°C x 65% RH and 30°C x 90% measured above
From the moisture absorption rates under RH conditions (M1 and M2, respectively), the moisture absorption rate difference ΔM (%)=M2-M1 is determined. This ΔM is used as a parameter as a measure of moisture absorption property evaluation. Reference Example 1 (Synthesis of polyether ester amide block copolymer) 340 parts of ε-caprolactam, 18 parts of terephthalic acid, 100 parts of polyethylene glycol having a number average molecular weight of 1000, and 0. 1 part and 0.01 part of trimethyl phosphate were charged into a polymerization reaction vessel, heated and stirred at 240°C for 1 hour under a nitrogen stream, then 0.1 part of antimony trioxide was added, and the mixture was heated to 250°C under a temperature increase and pressure reduction program.
, 0.5 mmHg or less for 4 hours to obtain a polyether ester amide block copolymer in which the proportion of N6 component was 45% by weight. Orthochlorophenol solution of this copolymer (concentration: 0.5g/
The relative viscosity ηr of 100 ml) at 25° C. was 2.05. Furthermore, M1 of the polymer alone was 6.2%, and M2 was 15.
2%, ΔM was 9.0%.

Example 1 Polyethylene terephthalate (PE) with an intrinsic viscosity of 0.65
T) and the polyether ester amide block copolymer (abbreviated as PEEA) synthesized in Reference Example 1 were blended in the form of pellets (weight ratio = 85/15) and discharged from a die to obtain an undrawn yarn. Then, by drawing and heat treating, a blended fiber of 75 denier and 24 filaments was obtained. As shown in Table 1, the fiber properties were good, and the tube knitted fabric after scouring had a moisture absorption rate difference ΔM of 1.9%, indicating that it had good moisture absorption properties.

Examples 2 to 4, Comparative Examples 1 and 2 Polyethylene terephthalate (polyethylene terephthalate (
Example 2 was carried out in the same manner as in Example 1 except that the material was changed to modified PET (abbreviated as modified PET). Further, Examples 3 and 4 and Comparative Examples 1 and 2 were conducted by changing only the blend ratio from Example 2. Table 1 shows the results of evaluating the characteristics of each blend fiber using the same method as in Example 1. Examples 2 to 4 have good moisture absorption properties and fiber physical properties, whereas Comparative Example 1
However, in Comparative Example 2, although the moisture absorption properties were high, the strength and elongation decreased so much that it was not suitable for practical use.

Comparative Examples 3 to 5 Polyethylene glycol (average molecular weight 10,000, abbreviated as PEG), nylon 6 (ηr = 2.4) and polyether ester (polyethylene glycol/terephthalic acid, molar ratio 1
:1, abbreviated as PEE), a blended fiber was obtained in the same manner as in Example 2. As shown in Table 1, all the results showed low hygroscopicity and were not suitable for practical use.

[0021]

[Table 1]

[0022]

Effects of the Invention The polyester blend fiber obtained by the present invention has sufficient hygroscopic properties to provide wearing comfort and has sufficient fiber physical properties, so it can be used in a wide range of applications. The blended fiber of the present invention can be used for underwear, shirts, etc.
It is extremely practical and suitable for blouses, innerwear, sportswear, slacks, outerwear, linings, and even bedclothes such as sheets and futon covers.

Claims (1)

[Claims] 1. A polyester with excellent comfort, which is a blend fiber of a fiber-forming polyester and a polyether ester amide, and the amount of the polyether ester amide is 5 to 30% by weight of the total weight of the fiber. fiber.