JP2003239178A - Base fabric for artificial leather and artificial leather - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a base fabric for artificial leather having excellent flexibility, stretchability and stretch back properties and artificial leather. <P>SOLUTION: The base fabric for artificial leather comprises a woven fabric or knitted fabric which is interlaced with extra fine fiber having &le;1.1 dtex single fiber fineness. The yarn constituting the woven fabric or knitted fabric is a latent crimp developing polyester fiber in which at least one component is a polytrimethylene terephthalate to give the base fabric for artificial leather. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention has a soft texture,
TECHNICAL FIELD The present invention relates to a base fabric for artificial leather and an artificial leather which are excellent in stretchability and stretchback property.

[0002]

2. Description of the Related Art The present applicant has previously filed Japanese Patent Application Laid-Open No. 11-2697
In Japanese Patent Publication No. 51, it was proposed that by using polytrimethylene terephthalate fiber in a woven or knitted fabric constituting the base fabric for artificial leather, it is possible to obtain a base fabric for artificial leather with soft texture and excellent stretchability. However, especially in non-clothing applications such as upholstered fabrics, the stretchability and stretchback property are not sufficiently satisfactory.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a base fabric for artificial leather and an artificial leather which have a soft texture and are excellent in stretchability and stretchback property.

[0004]

As a result of intensive studies in view of the above problems, the present inventor has found that this can be achieved by using a specific fiber as a fiber constituting a woven or knitted fabric, and completed the present invention. It is a thing. That is, the present invention is a base fabric for artificial leather in which a woven fabric or knitted fabric and ultrafine fibers having a single fiber fineness of 1.1 dtex or less are entangled, and the fibers constituting the woven fabric or knitted fabric have at least one component. A base fabric for artificial leather, which is a latent crimp-developing polyester fiber made of polytrimethylene terephthalate. According to the present invention, it is possible to obtain a base fabric for artificial leather and an artificial leather which have a soft texture and are excellent in stretchability and stretchback property.

The latent crimp-developing polyester fiber in the present invention is composed of at least two types of polyester components (specifically, many are joined in a side-by-side type or an eccentric core-sheath type). Yes, heat treatment causes crimping. Composite ratio of two polyester components (generally 70/30 to 30/70% by weight)
Of the above), and the shape of the joint surface (there is a straight or curved shape) is not particularly limited. The total fineness is 2
0-300 dtex, single yarn fineness is 0.5-20 dtex
Is preferably used, but is not limited thereto.

The present invention is a latent crimp developable polyester fiber, characterized in that at least one component is polytrimethylene terephthalate. Specific examples include those containing polytrimethylene terephthalate as one component as disclosed in JP 2001-40537 A. That is, it is a composite fiber in which two types of polyester polymers are joined in a side-by-side type or an eccentric core-sheath type, and in the case of the side-by-side type, the melt viscosity ratio of the two types of polyester polymers is preferably 1.00 to 2.00. In the case of the eccentric core-sheath type, it is preferable that the sheath polymer and the core polymer have an alkali reduction rate ratio of 3 times or more faster than the sheath polymer.

As a concrete combination of polymers,
Two types of polytrimethylene terephthalate, polytrimethylene terephthalate and polyethylene terephthalate, and polytrimethylene terephthalate and polybutylene terephthalate are preferable, and polytrimethylene terephthalate is particularly preferably arranged inside the crimp.
Here, the polytrimethylene terephthalate is a polyester having terephthalic acid as a main dicarboxylic acid and 1.3-propanediol as a main glycol component, and glycols such as ethylene glycol and butanediol and isophthalic acid, 2.6. -A dicarboxylic acid such as naphthalene dicarboxylic acid may be copolymerized, or
Other examples include those which may contain additives such as polymers, matting agents, flame retardants, antistatic agents, pigments and the like.

Polyethylene terephthalate is a polyester containing terephthalic acid as a main dicarboxylic acid and ethylene glycol as a main glycol component. Glycols such as butanediol and isophthalic acid, and dicarboxylic acids such as 2.6-naphthalenedicarboxylic acid. Examples thereof include those which may be copolymerized with an acid or the like, and may further contain additives such as other polymers, matting agents, flame retardants, antistatic agents and pigments. Further, as polybutylene terephthalate, terephthalic acid is used as a main dicarboxylic acid, and
-A polyester containing butanediol as a main glycol component, which may be copolymerized with glycols such as ethylene glycol and isophthalic acid, dicarboxylic acids such as 2.6-naphthalenedicarboxylic acid, and other polymers and matting agents. Examples thereof include those which may contain additives such as agents, flame retardants, antistatic agents and pigments.

As described above, according to the present invention, at least one of the polyester components constituting the latent crimp-developing polyester fiber is polytrimethylene terephthalate. 43-19108, JP-A-11-18992.
No. 3, JP 2000-239927, and JP 2
000-256918, JP 2000-3283.
No. 82, JP 2001-81640 A, etc.
The first component is polytrimethylene terephthalate, and the second component is a side-by-side type or eccentric sheath-core type composite spinning in which polyesters such as polytrimethylene terephthalate, polyethylene terephthalate, and polybutylene terephthalate are arranged in parallel or eccentrically. What has been done is disclosed. Particularly, a combination of polytrimethylene terephthalate and copolymerized polytrimethylene terephthalate, or a combination of two kinds of polytrimethylene terephthalate having different intrinsic viscosities is preferable.

Further, in the present invention, the initial crimp resistance of the latent crimp developable polyester fiber is 10 to 30 cN /
dtex is preferable, and particularly 20 to 30 cN / dt
ex Further, 20 to 27 cN / dtex is preferable. 30 cN
Above / dtex, it is difficult to obtain a soft texture, 1
If it is less than 0 cN / dtex, it is difficult to manufacture. The expansion / contraction elongation ratio of the actual crimp is preferably 10 to 100%, particularly 10 to 80%, and more preferably 10 to 60%. If it is less than 10%, the stretchability tends to be insufficient, and if it exceeds 100%, it is difficult to manufacture. Furthermore, the elastic modulus of the actual crimp is preferably 80 to 100%, particularly 85 to 100%, more preferably 85 to 97%.
If it is less than 80%, the stretchability tends to be insufficient, and 1
If it exceeds 00%, it is difficult to manufacture.

Further, the heat shrinkage stress at 100 ° C. is preferably 0.1 to 0.5 cN / dtex,
Especially 0.1 to 0.4 cN / dtex, and further 0.1 to
It is preferably 0.3 cN / dtex. 100 ° C
The heat shrinkage stress is an important requirement for developing crimps in the scouring and dyeing steps of the fabric. That is,
In order to overcome the binding force of the knitted fabric and develop crimp,
The heat shrinkage stress at 100 ° C. is preferably 0.1 cN / dtex or more. If it is less than 0.1 cN / dtex, the stretchability tends to be insufficient, and 0.5 cN / d
Exceeding tex is difficult to manufacture.

The expansion / contraction rate after hot water treatment is 100 to 250.
%, More preferably 150 to 25
0%, especially 180 to 250%. If it is less than 100%, the stretchability tends to be insufficient, and if it exceeds 250%, it is difficult to manufacture. The elastic modulus after hot water treatment is preferably 90 to 100%, more preferably 95 to 100%. If it is less than 90%, the stretchability tends to be insufficient. Examples of the latent crimp-developing polyester fiber having such characteristics include a composite fiber composed of single yarns in which two kinds of polytrimethylene terephthalate having different intrinsic viscosities are mutually compounded side-by-side.

The difference in intrinsic viscosity between the two types of polytrimethylene terephthalate is preferably 0.05 to 0.4 (dl / g), particularly 0.1 to 0.35 (dl / g), and more preferably 0. 15 to 0.35 (dl / g) is preferable. For example, when the intrinsic viscosity on the high viscosity side is selected from 0.7 to 1.3 (dl / g), the intrinsic viscosity on the low viscosity side is 0.5 to 1.1.
It is preferably selected from (dl / g). The intrinsic viscosity on the low viscosity side is preferably 0.8 (dl / g) or more, particularly 0.85 to 1.0 (dl / g), and further 0.9 to 1.
0 (dl / g) is preferable. The average intrinsic viscosity of this composite fiber is preferably 0.7 to 1.2 (dl / g),
8 to 1.2 (dl / g) is more preferable. Especially 0.85
~ 1.15 (dl / g) is preferable, and further 0.9 ~
1.1 (dl / g) is preferable.

The value of the intrinsic viscosity referred to in the present invention refers to the viscosity of the spun yarn, not the polymer used. The reason for this is that, as a drawback peculiar to polytrimethylene terephthalate, thermal decomposition is more likely to occur as compared with polyethylene terephthalate and the like, and even if a polymer having a high intrinsic viscosity is used, the intrinsic viscosity is significantly reduced by thermal decomposition. This is because it is difficult to maintain a large difference in intrinsic viscosity between the two. Here, polytrimethylene terephthalate is a polyester having a trimethylene terephthalate unit as a main repeating unit,
About 50 mol% or more of trimethylene terephthalate units,
Preferably 70 mol% or more, further 80 mol% or more,
More preferably, it means 90 mol% or more. Therefore, the total amount of the other acid component and / or glycol component as the third component is about 50 mol% or less, preferably 30 mol% or less, further 20 mol% or less, further preferably 1 mol% or less.
It includes polytrimethylene terephthalate contained in an amount of 0 mol% or less.

Polytrimethylene terephthalate is produced by combining terephthalic acid or its functional derivative with trimethylene glycol or its functional derivative in the presence of a catalyst under suitable reaction conditions. In this production process, one or more appropriate third components may be added to obtain a copolyester, or
Polyesters other than polytrimethylene terephthalate such as polyethylene terephthalate and polybutylene terephthalate, nylon and polytrimethylene terephthalate may be separately produced and then blended.

As the third component to be added, aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexanedicarboxylic acid, etc.), aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.) ), Aliphatic glycols (ethylene glycol, 1, 2
-Propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanedimethanol, etc.), aliphatic glycols containing aromatics (1,4-bis (β-hydroxyethoxy) benzene, etc.), polyether glycols (polyethylene glycol) , Polypropylene glycol and the like), aliphatic oxycarboxylic acid (ω-oxycaproic acid and the like), aromatic oxycarboxylic acid (p-oxybenzoic acid and the like) and the like. Further, a compound having one or three or more ester-forming functional groups (benzoic acid or the like or glycerin or the like) can also be used within a range in which the polymer is substantially linear. Furthermore, matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, lubricants such as aerosil, antioxidants such as hindered phenol derivatives, difficult A flame retardant, an antistatic agent, a pigment, a fluorescent brightening agent, an infrared absorbing agent, an antifoaming agent, etc. may be contained.

In the present invention, the spinning of latent crimp-developing polyester fibers is disclosed in the above-mentioned various patent documents. For example, after obtaining an undrawn yarn at a winding speed of 3000 m / min or less, 2 to It is preferable to use a method of drawing and twisting about 3.5 times, but a direct drawing method (spin draw method) that directly connects the spinning and drawing and twisting steps, and a high speed spinning method (spin take-up method) with a winding speed of 5000 m / min or more are adopted. You may. The form of the fibers may be long fibers or short fibers, but long fibers are preferred. Further, it may be uniform or thick and thin in the length direction, and the cross-sectional shape is round, triangular, L-shaped,
T-type, Y-type, W-type, Yachiyo-type, flat (with a flatness of 1.3-4, W-type, I-type, Bou-Melang type, corrugated type, skewer dumpling type, eyebrow type, rectangular parallelepiped type) Etc.), a polygonal type such as a dogbone type, a multi-leaf type, a hollow type or an irregular type.

Within the range which does not impair the object of the present invention, other fibers such as natural fibers and synthetic fibers are usually contained within a range of 50% by weight or less, for example, natural fibers such as cotton, wool, hemp and silk, cupra and viscose. , Polynosic, purified cellulose,
Polyester fibers such as acetate, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, nylon (aliphatic nylon such as nylon 6 and 66), acrylic, polyolefin (polyethylene, polypropylene, etc.), polyurethane, polyacrylonitrile, vinyl polymer It is also possible to mix various artificial fibers such as, for example, copolymerized types thereof, and composite fibers using the same or different polymers (side by side type, eccentric sheath core type, etc.).

In the present invention, the latent crimp-developing polyester fiber is used to form a woven or knitted fabric of a base fabric for artificial leather. The latent crimp-developing polyester fiber has a twist coefficient represented by the following formula. K3000-32000,
Preferably 7,000 to 25,000, more preferably 7
It is more effective to impart the stretchability by twisting at 000 to 23,000. Twist coefficient K = T × D ^0.5 T: twist number (T / m), D: fiber fineness (dtex)

In producing a knitted fabric, it is preferable to use both warp and weft in a woven fabric, for example, because excellent stretchability can be obtained in both warp and weft. However, it may be used as one of the warp and the weft if necessary. Has excellent stretchability only in the direction used. As the woven structure, taffeta, twill, satin and its modified structure can be used, and the density is preferably 40 to 70 fibers / 2.54 cm. The knitting structure may be weft knitting (circular knitting, flat knitting) or warp knitting (tricot, Russell), and the gauge is preferably 22 to 36 gauge. In the present invention, such knitted woven fabric and ultrafine fibers are entangled, the entangled form may be knitted woven fabric and ultrafine fibers entwined three-dimensionally with each other, the fiber bundle comrades gathered ultrafine fibers They may be intertwined with each other three-dimensionally, or ultrafine fibers and this fiber bundle may be intertwined together.

As the material of the ultrafine fibers, known materials can be applied without any limitation. For example, polyester fibers such as polytrimethylene terephthalate, polyethylene terephthalate and polybutylene terephthalate, polyamide fibers such as nylon 6 and nylon 66, synthetic fibers such as polyacrylonitrile, and artificial fibers such as acetate, cupra, rayon and purified cellulose can be used. Further, the latent crimp-developing polyester fiber in which at least one component described above is polytrimethylene terephthalate may be used, and these may be appropriately mixed and used. Further, polyester-based or nylon-based binder fibers may be mixed, and high-shrinkable polyester short fibers may be mixed, as long as flexibility is not impaired.

The ultrafine fibers can be obtained by the direct spinning method, or by dissolving and removing at least one component of the fibers capable of generating ultrafine fibers, or by separating the components. The single fiber fineness of the ultrafine fibers is 1.1 dtex or less, but is preferably 0.6 dtex or less, particularly preferably 0.01 dtex or more and 0.4 dtex or less in view of texture, denseness and the like. The fiber cross-sectional shape is not particularly limited. When generating ultrafine fibers from the ultrafine fiber-generating type fiber, the polymer component to be removed is preferably different from the polymer of the ultrafine fibers in solvent solubility, or decomposing agent decomposability.
Further, any fiber-forming polymer that can be peeled and divided by heat treatment or mechanical treatment may be used. Specific examples include polystyrene, polyolefin and copolymers thereof, polyvinyl alcohol, polyamide, polyester and the like.

The artificial leather base fabric in which the woven or knitted fabric and the ultrafine fibers are entangled with each other is laminated on the woven or knitted fabric after forming an ultrafine web by the card method or the papermaking method, or by the direct spinning method. The obtained ultrafine web is laminated on a woven and knitted fabric, and the fibers in the web and the woven and knitted fabric are entangled and integrated with each other by needle punching, water jet punching, or a combination thereof to obtain a base fabric for artificial leather. When the ultrafine fiber-generating fiber is used, it is then ultrafine by a solvent, heat treatment, or mechanical treatment. At this time, there are a method of laminating a woven or knitted material on both sides or one side of the web and entangled, and a method of stacking a plurality of the entangled materials again and entangled them again, slicing them in a later step, and taking two pieces.

The base fabric for artificial leather of the present invention is made into an artificial leather by impregnating the inside with a polymeric elastic material. After impregnation, it may be napped to make suede-like artificial leather.
Further, an artificial leather having a silver surface may be obtained by coating the surface with a polymer elastic material. Before applying the polymer elastic material, a step of densifying the base fabric for artificial leather by shrinkage heat treatment, heat press, wet press or the like or fixing the form with a sizing agent such as polyvinyl alcohol may be combined. . Examples of the polymer elastic body include polyurethane elastic body, acrylonitrile-butadiene elastic body, styrene-butadiene elastic body, polybutadiene, and synthetic rubber such as neoprene.
There are polyacrylic acid ester and the like. If necessary, additives such as a coloring agent such as carbon black, an antioxidant, an antistatic agent, a dispersant, a softening agent, and a coagulation modifier are added to the elastic polymer.

The preferred impregnation rate is 3 to 20% by weight, more preferably 4 to 20% by weight, especially 5 to 15% by weight. For example, a polyurethane elastic body is impregnated with a high molecular weight elastic body by impregnating and drying an emulsion of a water-dispersed polyurethane elastic body or by impregnating a solution type polyurethane elastic body dissolved in a solvent such as DMF. Solidify by method. Then
If desired, an artificial leather can be obtained by subjecting to an alkali reduction treatment of about 3 to 30% by weight before dyeing, and then subjecting it to post-treatment such as dyeing treatment and antistatic water repellent treatment.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to these Examples. The evaluations in Examples and Comparative Examples were measured by the following methods. (1) Intrinsic viscosity Intrinsic viscosity [η] (dl / g) is a value obtained based on the definition of the following equation. Ηr in the definition formula is 35 ° C. of a diluted solution of polytrimethylene terephthalate yarn or polyethylene terephthalate yarn dissolved in an o-chlorophenol solvent having a purity of 98% or more.
It is a value obtained by dividing the viscosity in 1. by the viscosity of the solvent measured at the same temperature, and is defined as the relative viscosity. C
Is the polymer concentration expressed in g / 100 ml. In addition, since it is difficult to measure the intrinsic viscosities of the composite multifilaments using polymers having different intrinsic viscosities, it is difficult to measure the respective intrinsic viscosities of the composite multifilaments. The intrinsic viscosity measured by using the yarn obtained by spinning the fibers independently was defined as the intrinsic viscosity constituting the composite multifilament.

(2) Flexibility Measured according to JIS-L-1096: 45 ° cantilever method, and take the average value of the vertical direction (MD) and the horizontal direction (CD) as the flexibility. (3) The stretch recovery rate of the artificial leather is 90% when the stretchable artificial leather is pulled.
It evaluated by the elongation rate which becomes the above. 15% or more in both directions of history; ○ 10% or more in both directions of history; △ Less than 10% in both directions of history; ×

<Production of latent crimp-developing polyester fiber> Side-by-side composite multifilaments having different intrinsic viscosities were produced by the following Production Examples 1 to 4. Table 1 shows the physical property values of the obtained fibers. {Production Example 1} Two kinds of polytrimethylene terephthalate having different intrinsic viscosities are extruded in a side-by-side type at a ratio of 1: 1 and spun at a spinning temperature of 265 ° C and a spinning speed of 1500 m / min to obtain an undrawn yarn, and then a hot roll. Temperature 55
℃, hot plate temperature 140 ℃, stretching speed 400m /
Minutes, the draw ratio was set so that the fineness after drawing was 56 dtex, and twisted to obtain a 56 dtex / 12f side-by-side type composite multifilament. The intrinsic viscosity of the obtained composite multifilament is [η] =
It was 0.90 and [η] = 0.70 on the low viscosity side. Table 1 shows initial tensile resistance, expansion / contraction elastic modulus / expansion / contraction elastic modulus of the actual crimp, expansion / contraction elastic modulus / expansion / contraction elastic modulus after hot water treatment, and thermal contraction stress at 100 ° C.

{Production Example 2} A side-by-side type composite multifilament of 84 dtex / 12f was obtained in the same manner as in Production Example 1 above. The intrinsic viscosity of the obtained composite multifilament was [η] = 0.88 on the high viscosity side and [η] = 0.70 on the low viscosity side. Initial tensile resistance, expansion / contraction expansion ratio of actual crimp / expansion / contraction elastic modulus, expansion / contraction expansion ratio after hot water treatment /
Table 1 shows the elastic modulus and the heat shrinkage stress at 100 ° C.

{Production Example 3} 56 dtex / 12f side-by-side type composite multifilaments were obtained in the same manner as above using two kinds of polytrimethylene terephthalate having different intrinsic viscosities from the above Production Example 1. The intrinsic viscosity of the obtained composite multifilament was [η] = 0.86 on the high viscosity side and [η] = 0.69 on the low viscosity side. Table 1 shows initial tensile resistance, expansion / contraction elastic modulus / expansion / contraction elastic modulus of the actual crimp, expansion / contraction elastic modulus / expansion / contraction elastic modulus after hot water treatment, and thermal contraction stress at 100 ° C.

{Production Example 4} 56 dtex / 12 was prepared by using two kinds of polyethylene terephthalate having different intrinsic viscosities.
A side-by-side type composite multifilament of f was obtained. The intrinsic viscosity of the obtained composite multifilament is [η] = 0.66 on the high viscosity side and [η] = 0.50 on the low viscosity side.
Met. Initial tensile resistance, expansion / contraction elastic modulus / expansion / contraction elastic modulus of actual crimp, expansion / contraction elastic modulus / contraction elastic modulus after hot water treatment, 10
Table 1 shows the heat shrinkage stress at 0 ° C.

[0032]

[Table 1]

[0033]

[Examples 1 to 3 and Comparative Example 1] Twisted yarn (800 T / m) of the composite filament obtained in each production example was used as a warp and a weft, and the density was 55 filaments / 2.54 cm in both the warp and the weft.
(Example 2 only 45 / 2.54 cm), areal weight 80 g /
to prepare a taffeta m ^2. The composite filament of Production Example 1 is Example 1, the composite filament of Production Example 2 is Example 2, and the composite filament of Production Example 3 is Example 3 and Production Example 4.
The composite filament of No. 1 is Comparative Example 1. 38 dtex /
Ultrafine fibers of 350 f polyethylene terephthalate fiber were cut to a length of 5 mm and then dispersed in water to prepare a papermaking slurry for the surface layer and the back layer.

100 g / m ^{2 of} surface weight and 50 g of back layer weight
/ M ² , and the taffeta was inserted to form a laminated structure fiber sheet, and then a three-dimensional entangled nonwoven fabric was obtained by jetting a high-speed water stream. The high-speed water flow was 3920 kPa from the surface layer and 294 from the back layer with a straight flow injection nozzle with a hole diameter of 0.15 mmφ.
After processing with a pressure of 0 kPa, 6 between the sheet and the nozzle.
A 0-mesh wire net was inserted, treated with water pressure of 2450 kPa, dried with a pin tenter, and a non-woven sheet material having a basis weight of 200 g / m ² and a thickness of 0.8 mm was produced.

The surface of this sheet was buffed with # 400 emery paper, and then Evaphanol AP-12 (forced emulsification type nonionic polyether yellowing type polyurethane elastic body) manufactured by Nika Kagaku Co., Ltd. was used as an emulsion. An impregnating solution prepared by adding sodium sulfate as a heat-sensitive coagulant was impregnated at a concentration of 7% and squeezed with a mangle so that the impregnation rate was 160%. Then 130 with a pin tenter
C., dried for 3 minutes. This raw fabric for artificial leather was dyed with a jet dyeing machine. The performance of the obtained artificial leather is shown in Examples 1 to 3.
All had a softness of 33 to 34 mm and a stretchability of ○, but Comparative Example 1 had a softness of 43 mm and a stretchability of Δ, which was inferior to Examples 1 to 3 in terms of flexibility and stretchability. .

[0036]

COMPARATIVE EXAMPLE 2 Example 1 was repeated except that taffeta was prepared by using polytrimethylene terephthalate filament of one component having an intrinsic viscosity [η] = 0.76 instead of the composite filament. To produce artificial leather. The performance of the obtained artificial leather was 34 mm in flexibility and stretchability Δ, which was inferior to Example 1 in terms of both flexibility and stretchability.

[0037]

Example 4 An artificial leather was produced in the same manner as in Example 1 except that polytrimethylene terephthalate fiber was used as the ultrafine short fiber. The performance of the obtained artificial leather was a flexibility of 24 mm and a stretchability ◯, and as in Example 1, both the flexibility and the stretchability were excellent.

[0038]

Example 5 An artificial leather was produced in the same manner as in Example 4, except that the taffeta was replaced with a 28-gauge tricot. The performance of the obtained artificial leather is
The softness and stretchability were 23 mm and the softness and stretchability were excellent as in Example 1.

[0039]

[Example 6] In Example 1, the warp was 56 dtex /
An artificial leather was produced in the same manner as in Example 1 except that 12f of polyethylene terephthalate multifilament was used. Regarding the performance of the obtained artificial leather, the flexibility of 38 mm and the stretchability in the weft direction were ◯, and although the flexibility was inferior to Example 1, the stretchability in the weft direction was excellent.

[0040]

According to the present invention, it is possible to provide a base fabric for artificial leather and an artificial leather which are excellent in flexibility, stretchability and stretchback property.

Claims (2)

[Claims] 1. A woven or knitted fabric, and a single fiber fineness of 1.1 dt.
An artificial leather base fabric formed by interlacing with ultrafine fibers ex or less, wherein the fibers constituting the woven or knitted fabric are latent crimp-expressing polyester fibers having at least one component made of polytrimethylene terephthalate. A base fabric for artificial leather that is characterized by: 2. The artificial leather according to claim 1, wherein a polymeric elastic body is impregnated inside the base cloth for artificial leather.