JPH09228156A - Short fiber for filling - Google Patents

Abstract

(57) Abstract: In a short fiber containing a composite fiber having a core-sheath structure, the core of the composite fiber is composed of polyetheresteramide R1 and the sheath is composed of polyester R2, and R1 / R2
The weight ratio represented by 15/85 to 50/50 is
A short fiber for filling, which has a moisture absorption rate of 2% or more after being left for 24 hours in an atmosphere of 30 ° C. and 90% RH. [Effects] According to the present invention, a short fiber for stuffing of polyester fiber having good yarn-forming property at the time of manufacture of stuffing, excellent hygroscopicity and bulkiness, having a comfortable feeling of use and being easy to recycle is obtained. You can

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to quilts such as quilts, mattresses, skin quilts, and cushions, and short fibers for padding such as pillows and back cushions. More specifically, the present invention relates to polyester short fibers for padding. The purpose of the invention is to impart hygroscopicity and improve the comfort of use of these products for use.

[0002]

2. Description of the Related Art Conventionally, polyester-based synthetic fiber stuffed cotton has been used in many products for the above-mentioned purpose because of its excellent bulkiness, light weight and excellent heat retention. This polyester synthetic fiber stuffed cotton is made to have three-dimensional crimp by composite spinning or asymmetric cooling to be excellent in bulkiness, or, for example, as described in Japanese Patent Publication No. 6-51076, the forward direction. A combination of type three-dimensional crimped fiber and reversal type three-dimensional crimped fiber makes it excellent in bulkiness under no load or under load, has a modified cross-section such as hollow, and has a fineness of fiber. In some cases, the fiber length or oil is optimized to improve the bulkiness and texture. However, since all of these polyester synthetic fiber stuffed cotton have no hygroscopic property and easily steam, they are currently used as stuffed cotton for winter or compound, and are hardly used for summer. It is desired to eliminate this drawback and develop a cotton for all seasons including summer.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a short fiber for filling a polyester fiber which has a hygroscopic and comfortable feeling and is easy to recycle.

[0004]

The present invention has the following constitution in order to solve the above-mentioned problems.

That is, in a staple fiber containing a conjugate fiber having a core-sheath structure, the core portion of the conjugate fiber is composed of polyetheresteramide R1 and the sheath portion is composed of polyester R2,
The weight ratio represented by R1 / R2 is 15/85 to 50/5
A short fiber for filling, which is 0 and has a moisture absorption rate of 2% or more after being left for 24 hours in an atmosphere of 30 ° C. and 90% RH.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The staple fiber for filling of the present invention will be described in detail below with reference to the accompanying drawings, while referring to the embodiments.

The structure of the short fiber for filling according to the present invention is as follows:
A composite short fiber in which a polyether ester amide R1 is compounded in the core of the fiber and a polyester R2 is compounded in the sheath of the fiber, and the polyether ester amide R1 of the core has high hygroscopicity. As the structure of the short fiber for filling of the present invention, it is also preferable to take a multi-core sheath structure. FIG.
2 and FIG. 2 are schematic cross-sectional views of an embodiment of the conjugate fiber used in the present invention. FIG. 1 is a cross-sectional schematic view example of a concentric circular core-sheath composite, and FIG. 2 is a modified eccentric core-sheath composite. is there.

The core portion R1 of the short fiber for filling of the present invention is a polyetheresteramide, which is a block copolymer having an ether bond, an ester bond and an amide bond in the same molecular chain. More specifically, one or more polyamide-forming components (a) selected from salts of lactams, aminocarboxylic acids, diamines and dicarboxylic acids, and polyethers comprising dicarboxylic acids and poly (alkylene oxide) glycols It is a block copolymer polymer obtained by subjecting the ester-forming component (b) to a polycondensation reaction. Examples of the polyamide-forming component (a) of the polyetheresteramide of the present invention include lactams such as caprolactam, enantolactam, dodecanolactam, undecanolactam, aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid. Ω-aminocarboxylic acid such as nylon 66, nylon 610, nylon 612
Nylon salts of diamine-dicarboxy, which are precursors of these, can be used alone or in combination of two or more. Preferred polyamide-forming components are ε-caprolactam, a nylon 66 salt.

On the other hand, the polyether ester component (b) constituting the soft segment of the polyether ester amide is composed of a dicarboxylic acid having 4 to 20 carbon atoms and poly (alkylene oxide) glycol. Examples of the dicarboxylic acid having 4 to 20 carbon atoms include aliphatic dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, vimelic acid, suberic acid, sebacic acid and dodecadiic acid, terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid. Aromatic dicarboxylic acids such as, and alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid can be used, and
Species or a mixture of two or more can be used. Preferred dicarboxylic acids are adipic acid, sebacic acid, dodecadic acid, terephthalic acid, isophthalic acid. Examples of poly (alkylene oxide) glycols include polyethylene glycol, poly (1,2- and 1,3-propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, ethylene oxide and propylene oxide. Alternatively, random or block copolymerization with tetrahydrofuran can be used, and polyethylene glycol is particularly preferable. The number average molecular weight of the poly (alkylene oxide) glycol is preferably 300 to 10,000, more preferably 500 to 4,000.

The polyether ester amide block copolymer of the present invention is obtained by polycondensing the above-mentioned polyamide-forming component (a) and polyether ester-forming component (b). As an industrially preferable method, there is a method in which (a) and (b) are heated and polycondensed under reduced pressure. In this case, in order to obtain a polymer having a high degree of polymerization and less coloring, for example, antimony oxide, titanium It is preferable to add an acid ester or the like as a polycondensation catalyst, and add phosphoric acid, a phosphoric acid ester or the like as a coloring inhibitor. The weight ratio of (a) and (b) in the polyether ester amide is 99 /
1 to 5/90 is preferable, and more preferably 80/20 to
It can be effectively used in the range of 10/90.

The polyester R2 in the present invention is not particularly limited. For example, polyethylene having terephthalic acid, 2,6-naphthalenedicarboxylic acid or an ester thereof as a main dicarboxylic acid component and ethylene glycol or tetramethylene glycol as a main glycol component is used. A linear polyester such as terephthalate, polybutylene terephthalate, or polyethylene 2,6-naphthalate can be used. Of these, polyethylene terephthalate (ordinary polyester) is preferred.

In addition, the short fiber for filling of the present invention includes
Sodium polyacrylate, poly N vinylpyrrolidone, polyacrylic acid and its copolymer, polymethacrylic acid and its copolymer, polyvinyl alcohol and its copolymer, polyacramide and its copolymer, crosslinked polyethylene oxide system A moisture-absorbing / water-absorbing substance such as a polymer or a general-purpose thermoplastic resin such as a polyolefin or a polyamide may be contained to such an extent that the object of the present invention is not impaired. In addition to the pigments such as titanium oxide and carbon black, various antioxidants, anti-coloring agents, light-proofing agents, antistatic agents and the like may of course be added.

In the short fiber for filling of the present invention, the polyether ester amide R1 is the main moisture absorbing component, and the combined amount of the polyether ester amide component must be 15 to 50% by weight. If it is less than 15% by weight, it is difficult to obtain a sufficient feeling of use due to moisture absorption, and at the same time, it is difficult to give a sufficient structural difference due to asymmetric cooling at the time of producing the composite short fiber as described later, and a three-dimensional crimp is sufficiently obtained. There is a difficult problem. If it exceeds 50% by weight, there is a problem that not only the polyether ester amide component is exposed on the surface of the fiber to deteriorate the spinnability at the time of producing the short fiber, but also the costly component is increased and the cost is increased.

The short fiber for filling of the present invention has a temperature of 30 ° C.
Moisture absorption rate after leaving for 24 hours in an atmosphere of × 90% RH is 2
It is necessary to design the composite amount and composite form so that the ratio is at least%. If it is less than 2%, there is a problem that the desired comfort cannot be obtained due to moisture absorption. To make your comfort level higher,
It is more preferable that the moisture absorption rate be 4% or more. According to the knowledge of the present inventors, the moisture absorption rate is preferably 30% or less from the viewpoint of generally not impairing the spinnability during the production of short fibers.

Further, as the short fibers for filling, short fibers having a fineness of 0.5 to 30 denier and a fiber length of 10 to 100 mm are preferably used. If it is thinner than 0.5 denier, the bulk of the aggregate required for filling becomes low,
The resilience to compression and the recovery of bulk also tend to decrease. When it is thicker than 30 denier, the texture tends to be coarse and hard. Further, when the fiber length is shorter than 10 mm, the entanglement between the fibers is deteriorated and cotton breakage easily occurs, and when it is longer than 100 mm, the fiber-opening property and the cotton-making property tend to be deteriorated.

The crimping may be appropriately selected depending on the intended use, but mechanical crimping is preferably applied in order to improve the bulkiness, softness, resilience to compression, recovery and cotton production. It is more preferable that the fibers are subjected to asymmetric cooling treatment at the time of yarn making into short fibers and each fiber is given a structural difference to be three-dimensionally crimped. The number of crimps is preferably 3 to 10 peaks / 25 mm, and the degree of crimp is preferably 5 to 30%.

When the composite fiber used in the present invention is used in a futon or the like, the composite fiber is mixed with 30 to 70% by weight of the composite fiber, and a normal polyester stuffed cotton, particularly hollow fiber polyester stuffed cotton with the mixture of 70 to 30% by weight. Is preferable. By blending ordinary polyester wadding, the bulkiness is further enhanced, the moisture transferability in the blended cotton aggregate is improved, and the comfort in use is improved. If the normal polyester wadding is less than 30% by weight, the effect of improving the bulkiness tends to be small, and if it exceeds 70% by weight, the proportion of the composite fiber is small and the use comfort due to moisture absorption tends to be insufficient. .

The cross-sectional shape of the short fiber for filling according to the present invention is not limited to a circle, but may be a modified cross-section such as a polygon or a hollow cross-section thereof.

[0019]

Next, the present invention will be described more specifically with reference to examples. The measuring methods of various characteristics described in the present invention are as follows.

[Moisture absorption rate] From the weight of the short fiber for filling of the present invention in an absolutely dry state and the weight change after leaving it in a thermo-hygrostat for 24 hours in an atmosphere of 30 ° C. × 90% RH, the following formula is obtained. I asked for.

Moisture absorption rate (%) = [(weight after moisture absorption−weight in absolute dry) / weight in absolute dry] × 100 [Fineness] It was measured according to the method of JIS L1015-7-51A.

[Average fiber length (cut length)] JIS L1
The measurement was performed according to the 015A method (staple diagram method).

[Number of crimps and degree of crimping] The number of crimps and degree of crimping are JIS L1015-7-12-1 and JIS.
It measured according to the method of L1015-7-12-2.

[Spinning property during spinning / drawing] There were no problems such as yarn breakage during spinning / drawing, sticking, stain on the spinneret, etc., and a good spinnability (⊚) to a difficulty in spinning (x) were evaluated.

[Comfort when using as a comforter] The short fibers for padding of the present invention are carded with a roller card to laminate the web to make a cotton comforter on the polyester side, and the mattress is a commercially available cotton product. , The pillow is made of commercially available normal polyester chips, and the temperature is 27 ° C x 7
In a room controlled to 0% RH, cotton sleepwear for summer was actually worn, and an actual sleeping experiment was conducted, and 7 grades were evaluated from comfortable (⊚) to extremely damp (×).

Examples 1 to 4 and Comparative Examples 1 to 3 As polyether ester amide R1, 340 parts of ε-caprolactam, 18 parts of terephthalic acid and a number average molecular weight of 10
100 parts of polyethylene glycol of 00, 0.1 part of "Irganox 1330" (manufactured by Ciba Geigy) and 0.01 part of trimethyl phosphate were charged into a polymerization reaction vessel, and the mixture was heated and stirred at 240 ° C for 1 hour under a nitrogen stream. , 0.1 parts of antimony trioxide was added, and a polymerization reaction was carried out at a temperature of 250 ° C. and 0.5 mmHg or less for 4 hours under a temperature-reduced pressure program to obtain a polyether ester having a nylon 6 component ratio of 45 wt%. An amide block copolymer was obtained. The relative viscosity ηr at 25 ° C. of this orthochlorophenol solution (concentration 0.5 g / 100 ml) was 2.05. The moisture absorption rate of the polymer alone was 15.2%. Using ordinary polyethylene terephthalate as R1 and polyester R2, at a spinning temperature of 280 ° C. and a take-up speed of 1350 m / min, a concentric structure with R1 as a core was formed, and a usual asymmetric cooling treatment was performed immediately below the spinneret. The undrawn yarn of the composite fiber was spun.

Then, the undrawn yarn is drawn at a draw ratio of 3.0 times,
Stretching bath temperature: 80 ℃, mechanical crimping with a crimper, finishing oil agent, cutting, setting, and drying with a 145 ℃ heat setter, composite fine fibers with a fineness of about 6 denier and a cut length of 51 mm Got

In Table 1, the properties of short fibers obtained by changing only the composite ratio of polyetheresteramide R1 and ordinary polyethylene terephthalate R2, the spinnability during spinning, and commercialization of these short fibers as a summer comforter, The result of comfort evaluation when actually used is shown.

[Table 1] The short fibers of Examples 1 to 4 are polyetheresteramide R
When the composite ratio of 1 was 15 to 50% by weight, crimp due to asymmetric cooling was well expressed, and the spinnability during spinning was also good. Further, the moisture absorption rate of the composite short fibers was 2.2 to 7.7%, and the comfort feeling when used as a comforter was also good. In contrast,
Comparative Example 1 was produced by using only ordinary polyester without using the polyetheresteramide R1. There is no problem in the spinnability at the time of spinning, but the crimp is insufficient, the fluff of the futon is lacked, and the moisture absorption rate is low. When I used it as a comforter, I felt stuffy and had trouble sleeping. Comparative Example 2
Has a composite ratio of polyetheresteramide R1 of 14% by weight, relatively exhibits crimping due to asymmetric cooling, and has good spinnability during spinning, but has a low moisture absorption rate of 1.9%. Therefore, when used as a comforter, it felt stuffy and was difficult to sleep. Further, in Comparative Example 3, the polyether ester amide R1 composite ratio was 52% by weight, crimping due to asymmetric cooling was well expressed, the moisture absorption rate was 8.0%, and the comfort feeling when used as a comforter was also good. However, yarn breakage during fiber spinning and sticking between fibers were observed, resulting in poor spinnability.

In addition, 1.8 kg of the composite staple fiber of Example 3 was packed in a lateral side of commercially available cotton, and when it was actually used by wearing winter pajamas in a room with a winter atmosphere, a conventional polyester wadding was obtained. Although it was slightly less bulky than the commercially available comforter, it was a futon with practically no problem.

[Example 5] 50% by weight of the hygroscopic composite short fiber of Example 3, commercially available normal polyester short fiber (asymmetric cooling three-dimensional crimp having a circular cross section and a hollow ratio of 31%, 13 denier,
(64 mm) 50% by weight of cotton was blended and commercialized as a comforter for summer skin in the same manner as in Example 3, and the comfort feeling during use as a comforter was evaluated. The average moisture absorption rate of the whole stuffed cotton was 3.1%, and the comfort feeling when used as a comforter was also good.

[0031]

EFFECTS OF THE INVENTION According to the present invention, it is possible to provide a short fiber for filling a polyester fiber which is excellent in bulkiness, has a comfortable feeling of use, and is easily recycled.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view schematically showing an example of a concentric core-sheath structure of a composite short fiber for filling of the present invention.

FIG. 2 is a schematic cross-sectional view schematically showing, as a model, an example of a modified eccentric core-sheath structure of the composite short fiber for filling of the present invention.

[Explanation of symbols]

 1: Polyether ester amide R1 2: Polyester R2

Claims (3)

[Claims] 1. A staple fiber containing a composite fiber having a core-sheath structure, wherein the core portion of the composite fiber is composed of polyetheresteramide R1 and the sheath portion is composed of polyester R2, and R1 / R2.
The weight ratio represented by 15/85 to 50/50 is
A short fiber for filling, which has a moisture absorption rate of 2% or more after being left for 24 hours in an atmosphere of 30 ° C. and 90% RH. 2. A fineness of 0.5 to 30 denier and a fiber length of 1
The short fiber for filling according to claim 1, which has a length of 0 to 100 mm. 3. Composite fibers produced by asymmetric cooling 3
The short fiber for filling according to claim 1 or 2, which has a dimensional crimp and has a crimp number of at least 3 peaks / 25 mm and a crimp degree of at least 5%.