JPH09228157A - Staple fiber for stuffing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide polyester staple fibers for stuffing having excellent spinnability in producing the staple fibers, bulkiness and comfortable use feeling, and readily recyclable. SOLUTION: This staple fiber for stuffing is a hollow three-layered conjugate staple fiber having an intermediate layer composed of polyether esteramide R1 component (1) between an outer layer and an inner layer both composed of polyester R2 components (2), and a content of the polyester esteramide R1 component (1) is 15-50wt.%, and a moisture absorptivity of the fiber after holding in an atmosphere of 30 deg.C×90% RH for 24hrs is >=2 %.

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-based synthetic fiber stuffed cotton is made to have three-dimensional crimps by composite spinning or asymmetric cooling so as to have an excellent bulkiness, or, for example, as described in Japanese Patent Publication No. 6-51076, the forward direction. A combination of type three-dimensional crimped fibers and reversal type three-dimensional crimped fibers makes it excellent in bulkiness under no load or under load, and makes the cross-section of the fiber irregularly shaped such as hollow, fiber fineness, fiber length Alternatively, it is disclosed that the bulkiness and the texture are improved by optimizing the oil agent. Further, in order to obtain a soft texture by adding a silicone resin, for example, Japanese Patent Publication No. 52-28426,
There are inventions described in Japanese Utility Model Publication No. 53-5353 and Japanese Patent Publication No. 4-43435. However, since all of these polyester synthetic fiber stuffed cotton have no hygroscopicity and tend to be stuffy, they are 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 short fiber for filling of the present invention has the following constitution in order to solve the above problems.

That is, in the hollow three-layered composite staple fiber having a hollow portion, which is obtained by compounding an intermediate layer composed of a polyetheresteramide R1 component between an outer layer composed of a polyester R2 component and an inner layer, a polyetheresteramide R1 component is combined in an amount of 15 to 50% by weight, and 30
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 ° C x 90% RH.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings with reference to embodiments.

The short fiber for filling of the present invention is a hollow three-layer composite fiber having a hollow portion in which an intermediate layer made of a polyetheresteramide R1 component is compounded between an outer layer made of a polyester R2 component and an inner layer. Is. This polyetheresteramide R1 component has high hygroscopicity. 1 and 2 are schematic cross-sectional views schematically showing an example of the conjugate fiber of the present invention. FIG. 1 shows a circular hollow form and FIG. 2 shows a trilobal hollow form. .

The short fiber for filling of the present invention refers to a composite fiber of polyetheresteramide R1 component and polymer of polyester R2 component, which is spun as a hollow fiber into three layers. The polyether ester amide R1 component that constitutes the intermediate layer of the three-layer composite fiber is a hygroscopic component, and is generally easily deformed at low temperatures, and is placed in the intermediate layer of the three-layer composite fiber
The structure is such that it is wrapped with the polyester R2 component polymer that constitutes the outer layer and the inner layer, and the yarn-forming property and the fiber structure stability during the production of short fibers for filling are improved. Polyether ester amide R constituting the intermediate layer of the three-layer composite fiber
One component is a hygroscopic component, and as the R1 component, a block copolymer having an ether bond, an ester bond and an amide bond in the same molecular chain can be used. For example, one or more polyamide-forming components (a) selected from lactams, aminocarboxylic acids, salts of diamines and dicarboxylic acids, and polyether ester-forming components composed of dicarboxylic acids and poly (alkylene oxide) glycols. A block copolymer polymer or the like obtained by subjecting (ii) to a polycondensation reaction can be used.

As the polyamide-forming component (a) of the polyether ester amide of the present invention, caprolactam,
Lactams such as enantolactam, dodecanolactam and undecanolactam, ω-aminocarboxylic acids such as aminocaproic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid, precursors of nylon 66, nylon 610, nylon 612, etc. Certain diamine-dicarboxylic nylon salts can be used, and 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, as the polyether ester component (b) constituting the soft segment of the polyether ester amide, a dicarboxylic acid having 4 to 20 carbon atoms and poly (alkylene oxide) glycol can be used. As the dicarboxylic acid having 4 to 20 carbon atoms, succinic acid,
Aliphatic dicarboxylic acids such as glutaric acid, adipic acid, vimelic acid, suberic acid, sebacic acid, dodecadiic acid, etc., aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid An alicyclic dicarboxylic acid such as an acid can be used, and one kind or a mixture of two or more kinds can be used.
Preferred dicarboxylic acids are adipic acid, sebacic acid, dodecadic acid, terephthalic acid, isophthalic acid.

The poly (alkylene oxide) glycol may be polyethylene glycol, poly (1,2).
-And 1,3-propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, random or block copolymerization of ethylene oxide and propylene oxide or tetrahydrofuran, and the like can be used. The number average molecular weight of the poly (alkylene oxide) glycol is preferably 300 to 10,000, more preferably 500 to 4000.

The polyetheresteramide block copolymer of the present invention can be obtained by polycondensing the above-mentioned polyamide-forming component (a) and polyetherester-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
The range is 10/90.

The polyether ester amide R1 component constituting the intermediate layer of the three-layer composite fiber is polyester R
A blended component of the two components and the polyetheresteramide R1 component is preferable because it improves the spinnability in the spinning and drawing steps during the production of short fibers for filling.

The blending state of the polymers may be either a state in which the individual polymers are mixed with each other to be homogeneous, or a state in which the individual polymers coexist without being completely mixed. In the present invention, the states of the polymers are not particularly limited, but from the viewpoint of moisture absorption efficiency, it is preferable that the polyether ester amide R1 component and the polyester R2 component are present separately in one fiber. .

The polyester R2 component constituting the outer layer and the inner layer of the short fiber of the present invention is not particularly limited, but for example, terephthalic acid, 2,6-naphthalenedicarboxylic acid or their ester is the main dicarboxylic acid component, and ethylene glycol or A linear polyester such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene 2,6-naphthalate containing tetramethylene glycol as a main glycol component can be used. Of these, polyethylene terephthalate (normal polyester) is preferably used from the viewpoint of increasing the strength of the short fiber of the present invention.

When the polyether ester amide R1 component constituting the intermediate layer of the three-layer composite fiber is used as a blend component, the polyester R2 component used for the outer layer, the inner layer and the intermediate layer, especially the intermediate layer is poly. Because of its good compatibility with the ether ester amide R1 component,
Modified polyethylene terephthalate obtained by copolymerizing a sulfonate compound is preferable. Here, a preferable sulfonate compound as a copolymerization component of the modified polyester is 5-sodium sulfoisophthalic acid, 5- (tetraalkyl) phosphonium sulfoisophthalic acid and ester derivatives thereof, sodium р-hydroxyethoxybenzenesulfonate, 2,5- Potassium bis (hydroxyethoxy) benzenesulfonate and the like can be used. The copolymerization amount of the sulfonate compound is preferably 0.1 to 7 mol% with respect to the acid component, more preferably 0. 0, in view of the compatibility with the polyetheresteramide R1 and the physical properties of the obtained composite short fiber. It is 5 to 5 mol%.

Further, part of the dicarboxylic acid component of the polyester R2 component is a dicarboxylic acid such as adipic acid or isophthalic acid and its ester derivative, ρ-oxybenzoic acid,
It may be replaced by an oxycarboxylic acid such as р-β-oxyethoxybenzoic acid and its ester derivative.

Further, a part of the glycol component is, for example,
It may be replaced with glycol such as 1,4-bis (β-oxyethoxy) benzene, bisglycol ether of bisphenol A, and polyalkylene glycol. Furthermore, pentaerythritol, trimethylolpropane,
A chain branching agent such as trimellitic acid or trimesic acid can also be used.

In addition, the polyester R2 component 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. Moisture absorption of polymer, polyacrylamide and its copolymer, cross-linked polyethylene oxide type polymer, etc.
A general-purpose thermoplastic resin such as a water-absorbing substance or polyolefin or 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 stabilizers, antistatic agents and the like are preferably added to the composite short fibers, if necessary. .

In the short fiber for filling of the present invention, the polyether ester amide R1 component is the main moisture absorbing component, and the combined amount of the polyether ester amide component is 15 to 15.
It must be 50% by weight. If it is less than 15% by weight, there is a problem that it is difficult to obtain a sufficient feeling of use due to moisture absorption. 5
If the amount exceeds 0% by weight, the rigidity of the entire fiber is lowered, which may easily cause the crimp toughness and insufficient rebound when compressed as a wadding, and at the same time, due to the asymmetric cooling during the production of the composite short fiber described later. It is difficult to give a sufficient structural difference,
Not only is it difficult to obtain a three-dimensional crimp and the polyetheresteramide component of the intermediate layer is likely to appear on the fiber surface, which causes sticking between the single fibers and deteriorates the yarn production during the production of short fibers. There is a problem that the amount of high components increases and the cost increases.

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 of the polyether ester amide component and the fiber morphology so that the content is at least%. If it is less than 2%, there is a problem that the desired comfort cannot be obtained due to moisture absorption.
In order to further improve the comfort of use, it is more preferable that the moisture absorption rate be 4% or more.

The upper limit of the moisture absorption rate is not particularly limited, but according to the knowledge of the present inventors, it is generally 30% or less from the viewpoint of not impairing the spinnability during the production of short fibers.

Furthermore, the short fibers for filling have a fineness of 0.5.
Short fibers having a fiber length of 10 to 100 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 as a filling tends to be low, and the resilience to compression and the recoverability of bulk tend to be low. 30
When it is thicker than denier, the texture tends to be rough. Further, if the fiber length is shorter than 10 mm, the entanglement between the fibers is deteriorated and the cotton breaks easily, and if it is longer than 100 mm, the fiber-opening property and the cotton-making property tend to be deteriorated.

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

When the short fiber of the present invention is used in a futon or the like, 30 to 70% by weight of the short fiber of the present invention is used as a stuffed cotton, and 70 to 30% by weight of a normal polyester stuffed cotton, particularly a hollow fiber polyester stuffed cotton. % Blending is preferred. 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 content of ordinary polyester wadding is less than 30% by weight, the effect of improving bulkiness may be reduced, and if it exceeds 70% by weight, the proportion of the composite fibers may be reduced and the comfort of use due to moisture absorption may be insufficient. .

The cross-sectional shape of the short fiber for filling of the present invention is not limited to a round shape, and may be a hollow having an irregular cross-section such as a polygon.

[0028]

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.

(1) Moisture Absorption Rate The dry weight of the short fiber for filling of the present invention and 30 ° C. × 9
The value was calculated from the following formula from the weight change after standing for 24 hours in a thermo-hygrostat under an atmosphere of 0% RH.

Moisture absorption rate (%) = [(weight after moisture absorption−weight in absolute dry) / weight in absolute dry] × 100 (2) Fineness It was measured according to the method of JIS L1015-7-51A.

(3) Average fiber length (cut length) JIS L1015A method (staple diagram method)
It measured according to.

(4) Number of crimps and degree of crimp The number of crimps and the degree of crimp are JIS L1015-7-12-
1 and the method of JIS L1015-7-12-2.

(5) Spinnability 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 difficult spinnability (×) were evaluated.

(6) Comfortability as a quilt The short fiber for filling of the present invention is carded with a roller card to laminate the web for cotton, and the polyester lining is used as a skin quilt. The mattress is a commercially available cotton product. , Pillows with commercially available ordinary polyester chips are packed at a temperature of 2
In a room controlled at 7 ° C. and 70% RH, cotton sleepwear for summer was actually worn, and an actual sleep experiment was conducted, and 7 grades from comfortable (⊚) to extremely damp (×) were evaluated.

[Examples 1 to 4 and Comparative Examples 1 to 3] As polyether ester amide R1, 340 parts of ε-caprolactam, 18 parts by weight of terephthalic acid, 100 parts by weight of polyethylene glycol having a number average molecular weight of 1000, and "IRGA Knox 1330 "(made by Ciba Geigy)
0.1 parts by weight and trimethyl phosphate 0.01
Charge into a polymerization reaction vessel together with 1 part by weight, and under a nitrogen stream, 2
After heating and stirring at 40 ° C. for 1 hour, antimony trioxide (0.
1 part by weight was added, and the temperature was raised under reduced pressure at 250 ° C.,
By carrying out a polymerization reaction for 4 hours under a condition of 0.5 mmHg or less, a polyetheresteramide block copolymer having a nylon 6 component ratio of 45% by weight was obtained. The melting point of this copolymer was 176 ° C., and the relative viscosity ηr of the orthochlorophenol solution (concentration 0.5 g / 100 ml) at 25 ° C. was 2.05.

The moisture absorption rate of this copolymer alone is 15.2.
%Met. Using ordinary polyethylene terephthalate having a melting point of 255 ° C. as the R1 and the polyester R2,
The spinning temperature is 280 ° C., the take-up speed is 1350 m / min, and the hollow cross-section structure is 29% hollow. The ordinary asymmetric cooling treatment is performed directly under the spinneret to obtain the unstretched yarn of the three-layer composite hollow fiber as shown in FIG. Spun

Then, the undrawn yarn is drawn at a draw ratio of 3 times at a drawing bath temperature of 80 ° C., a mechanical crimp is applied by a crimper, a finishing oil is applied and cut, and then set and dried by a heat setter at 145 ° C. And fineness of about 6 denier, cut length 51
mm composite short fibers were obtained.

Table 1 shows the properties of the composite short fibers obtained by changing only the composite ratio of the outer layer and the inner layer of the polyether ester amide R1 and the normal polyethylene terephthalate R2, the spinnability at the time of spinning, and the composite short fibers for summer skin. The results of evaluation of comfort when used as a comforter and actually used are shown.

[0039]

[Table 1] The composite short fibers of Examples 1 to 4 had a polyether ester amide R1 composite ratio of 16 to 50% by weight, showed very good crimping due to asymmetric cooling, and had good spinnability during spinning. The hygroscopic rate of the composite short fibers was 2.4 to 7.7%, and the comfort feeling when used as a comforter was also good.

On the other hand, Comparative Example 1 was produced by using only ordinary polyester without using the polyetheresteramide R1. The spinning property was good at the time of spinning and the crimp was sufficiently developed to give a futon. Although it had sufficient bulkiness, it had a low moisture absorption rate and felt stuffy when used as a comforter, which made it difficult to sleep. Comparative Example 2 has a polyether ester amide R1 composite ratio of 14% by weight, exhibits sufficient crimping due to asymmetric cooling, and has good spinnability during spinning, but has a moisture absorption rate of 1.9%. Since the rate was low, I felt stuffy when I used it as a comforter, and I had difficulty sleeping. Further, in Comparative Example 3, the polyether ester amide R1 has a composite ratio of 52% by weight.
As a result, crimping due to asymmetrical cooling was relatively well expressed, the moisture absorption rate was 8.1%, and the comfort feeling when used as a comforter was also good, but yarn breakage and sticking between fibers during spinning were slightly observed. The spinnability was poor.

Further, 1.8 kg of the composite staple fiber of Example 3 was packed in a lateral side of commercially available cotton, and as a result of actually using it by wearing winter pajamas in a room with a winter atmosphere, as a result, a conventional polyester cotton wadding was obtained. It was a futon whose bulkiness was comparable to that of a commercially available comforter using.

[Example 5] 40% by weight of the composite short fibers of Example 4, commercially available normal polyester short fibers (asymmetric cooling three-dimensional crimp having a circular cross section and a hollow ratio of 31%, 6 denier, 64 m)
m) Similar to Example 4, except that 60% by weight of cotton was mixed, the product was commercialized as a comforter for summer skin, and the comfort feeling when used as a comforter was evaluated. The average moisture absorption rate of the whole stuffed cotton was 3.9%, and the comfort feeling when used as a comforter was also good.

[0043]

Industrial Applicability According to the present invention, it is possible to obtain a polyester fiber short fiber for filling, which has good spinnability during the production of short fiber, is excellent in bulkiness, has a comfortable feeling of use, and is easy to recycle. You can

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a staple fiber for filling of the present invention as a model.

FIG. 2 is a schematic cross-sectional view schematically showing another example of the short fiber for filling according to the present invention.

[Explanation of symbols]

 1: Polyether ester amide R1 component 2: Polyester R2 component

Claims (3)

[Claims] 1. A hollow three-layered composite staple fiber having a hollow portion, wherein an intermediate layer composed of a polyether ester amide R1 component is composited between an outer layer composed of a polyester R2 component and an inner layer, and a polyether ester amide is formed. R1
15-50% by weight of components are combined and 30 ° C x 90%
A short fiber for filling, which has a moisture absorption rate of 2% or more after being left in an RH atmosphere for 24 hours. 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. The short fiber has a three-dimensional crimp generated by asymmetric cooling, and has a crimp number of at least 3 peaks / 25 mm and a crimp degree of at least 5%. The short fiber for filling according to 2.