JP2003301383A - Synthetic leather - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic leather of very soft feeling having high exfoliation durability even if used under conditions of undergoing repeated stretch action. <P>SOLUTION: The synthetic leather is such one that at least one side of a fibrous ground fabric 50-200 g/m<SP>2</SP>in basis weight is provided with a synthetic resin coating film layer, wherein the fiber constituting the ground fabric is a latently crimp-developable polyester fiber meeting the following requirements: (a) initial tensile resistance degree is 10-30 cN/dtex, (b) the stretch elongation percentage and the stretch elastic modulus of actual crimp are 10-100% and 80-100%, respectively, and (c) heat shrinkage stress at 100&deg;C is 0.1-0.5 cN/dtex. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a synthetic leather having a soft feel and excellent peeling resistance when repeatedly stretched. [0002] Conventionally, what is called synthetic leather is cow,
It is used to resemble natural leather such as horses and sheep, but it is made by coating or laminating a synthetic resin dissolved using a solvent on a fiber base fabric such as woven or knitted fabric by a dry method. There are known dry synthetic leather and wet synthetic leather made by coating a synthetic resin dissolved using a solvent on a fiber base fabric such as a woven or nonwoven fabric by a wet method. [0003] Natural leather has a structure in which ultra-fine collagen fibers are three-dimensionally entangled, and the density is coarser toward the inside and denser toward the surface, and the dense fiber layer on the surface is dyed with a dye. And those that have been colored with a pigment. On the other hand, for example, wet synthetic leather is formed on a woven or non-woven fabric layer by applying a synthetic resin by a wet method to obtain elasticity and moisture permeability and forming a sponge, and further formed thereon. It consists of three layers of colored surface layers,
There are fundamental differences between the two in terms of structure. As described above, due to the difference in structure between synthetic leather and natural leather, there are many differences in their characteristics. The differences are strength, feel, feeling, moisture release, moisture absorption, coloring, weather resistance, stretchability, peel resistance, etc.
In particular, peel resistance is a particular problem due to the structure of synthetic leather. Strength, feel, feel, and peel resistance have been significantly improved as a result of studies such as improving the properties of synthetic resins, adjusting the thickness of the resin film, or adjusting the degree of penetration of the resin into the base layer. However, it is still not enough. In view of the current situation, the present applicant has previously proposed in Japanese Patent Application Laid-Open No. H11-100779 that the use of polytrimethylene terephthalate fiber as a fiber constituting a fiber base fabric greatly improves the use of the fiber. The market is currently demanding even higher levels. [0005] The present invention is to provide a synthetic leather meeting such a demand. In view of the above problems, the present invention is different from the conventional study means, and particularly, the fiber base fabric, that is, the fibers constituting the woven fabric, knitted fabric or non-woven fabric have been eagerly studied. As a result of the study, the present invention has been completed. That is, the present invention is a synthetic leather having a synthetic resin coating layer formed on at least one surface of a fiber base fabric having a basis weight of 50 to 200 g / m ² , wherein the fibers constituting the fiber base fabric exhibit latent crimping. It is a synthetic polyester fiber, which satisfies the following (a) to (c). (A) The initial tensile resistance is 10 to 30 cN / dtex. (B) The stretching and elongation of the actual crimp is 10 to 100%, and the stretching and elasticity is 80 to 100%. 1 to 0.5 cN /
dtex The latently crimp-expressing polyester fiber in the present invention is a polyester fiber composed of at least two kinds of polyester components (specifically, many are bonded in a side-by-side type or an eccentric core-sheath type). And a crimp is developed by the heat treatment. Composite ratio of two polyester components (generally 70/30 to 30/70 by mass%)
), And the joining surface shape (there is a straight or curved shape) is not particularly limited. The total fineness is 2
0 to 300 dtex, single yarn fineness is 0.5 to 20 dtex
Is preferably used, but is not limited thereto. [0008] In the present invention, the initial tensile resistance of the latent crimp developing polyester fiber is 10 to 30 cN / dte.
x, especially 20 to 30 cN / dtex,
Further, 20 to 27 cN / dtex is preferable. 10cN
Those with less than / dtex are difficult to manufacture, and 30 cN /
If it exceeds dtex, the object of the present invention will not be achieved. or,
The elongation and contraction rate of the actual crimp needs to be 10 to 100%, particularly 10 to 80%, and more preferably 10 to 60%. If it is less than 10%, the object of the present invention cannot be achieved. 1
If it exceeds 00%, it is difficult to manufacture. Further, the elastic modulus of the actual crimp needs to be 80 to 100%, and especially 85 to 10%.
0%, more preferably 85 to 97%. If it is less than 80%, the object of the present invention cannot be achieved. Further, the heat shrinkage stress at 100 ° C. needs to be 0.1 to 0.5 cN / dtex, more preferably 0.1 to 0.4 cN / dtex, especially 0.1 to 0.3 cN / dtex.
More preferably, it is cN / dtex. The heat shrinkage stress at 100 ° C. is an important requirement for developing crimps in the fabric refining and dyeing steps. In other words, in order to overcome the restraining force of the fabric and develop crimp,
The heat shrinkage stress at 0 ° C. needs to be 0.1 cN / dtex or more, and if it is less than 0.1 cN / dtex, the object of the present invention is not achieved. If it exceeds 0.5 cN / dtex, it is difficult to manufacture. The stretch ratio after hot water treatment is 100 to 250.
%, More preferably 150 to 25%.
0%, especially 180-250%. In addition, if it exceeds 250%, it is difficult to manufacture. The elastic modulus after hot water treatment is 90 to 10
0%, preferably 95 to 10%.
0%. Examples of the latent crimp developing polyester fiber having such properties include a composite fiber composed of a single yarn in which two types of polytrimethylene terephthalate having different intrinsic viscosities are combined in a side-by-side type. The difference in intrinsic viscosity between the two kinds of polytrimethylene terephthalate is preferably 0.05 to 0.4 (dl / g), particularly 0.1 to 0.35 (dl / g), and more preferably 0.1 to 0.35 (dl / g). It is preferably from 15 to 0.35 (dl / g). 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
Preferably, it is selected from 1.1 (dl / g). still,
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 more preferably 0.9 (dl / g).
~ 1.0 (dl / g) is good. The intrinsic viscosity of the conjugate fiber itself, that is, the average intrinsic viscosity is 0.7 to 1.2 (d
l / g), preferably 0.8 to 1.2 (dl / g), more preferably 0.85 to 1.15 (dl / g), and even more preferably 0.9 to 1.1 (dl / g). / G) is preferred. The value of the intrinsic viscosity referred to in the present invention indicates not the viscosity of the polymer used but the viscosity of the spun yarn. The reason for this is that, as a disadvantage peculiar to polytrimethylene terephthalate, thermal decomposition tends to occur as compared with polyethylene terephthalate, etc., and even when a polymer having a high intrinsic viscosity is used, the intrinsic viscosity is significantly reduced due to 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,
At least about 50 mol% of trimethylene terephthalate units,
Preferably at least 70 mol%, more preferably at least 80 mol%,
More preferably, it is 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, more preferably 20 mol% or less, and further preferably 1 mol% or less.
It includes polytrimethylene terephthalate contained in a range of 0 mol% or less. Polytrimethylene terephthalate is produced by combining terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions. In this production process, an appropriate one or two or more third components may be added to form a copolymerized polyester, or
Polyesters other than polytrimethylene terephthalate such as polyethylene terephthalate and polybutylene terephthalate, nylon, and polytrimethylene terephthalate may be separately produced and then blended. The content of polytrimethylene terephthalate in blending is preferably at least 50% by mass. The third components to be added include aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexane dicarboxylic acid, etc.), and aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.). ), Aliphatic glycols (ethylene glycol, 1,2
-Propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexane dimethanol, etc.), aliphatic glycols containing aromatics (1,4-bis (β-hydroxyethoxy) benzene, etc.), polyether glycols (polyethylene glycol) , Polypropylene glycol and the like), aliphatic oxycarboxylic acids (such as ω-oxycaproic acid), and aromatic oxycarboxylic acids (such as p-oxybenzoic acid). Compounds having one or more ester-forming functional groups (such as benzoic acid or glycerin) can also be used as long as the polymer is substantially linear. Further, matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, lubricating agents such as aerosil, antioxidants such as hindered phenol derivatives, and the like. A fuel, an antistatic agent, a pigment, a fluorescent brightener, an infrared absorber, an antifoaming agent, and the like may be contained. In the present invention, the spinning of a latent crimp developing polyester fiber is described in, for example, JP-A-2000-23.
No. 9927, for example, 3000 m
After obtaining an undrawn yarn at a winding speed of not more than 2 / 3.5,
The method of drawing and twisting about twice is preferable, but the direct drawing method (spin draw method) directly connecting the spinning and drawing steps, and the winding speed of 500
A high-speed spinning method (spin take-up method) of 0 m / min or more may be employed. Further, the form of the fiber may be a long fiber or a short fiber, may be uniform in the length direction or may be thick and thin, and the cross-sectional shape may be round, triangular, L-shaped, T-shaped,
Y-type, W-type, Yatsuha-type, flat (approximately 1.3 to 4 flatness, including W-type, I-type, Boomerang type, corrugated type, skewered dumpling type, cocoon type, rectangular solid type, etc. ), A polygonal type such as a dog bone type, a multi-leaf type, a hollow type or an irregular type. Further, the form of the yarn may be a spun yarn such as a ring spun yarn or an open-end spun yarn, a multifilament raw yarn (including an ultrafine yarn) having a single yarn denier of about 0.1 to 5 denier, a sweet twisted yarn or the like.
There are strong twisted yarn, false twisted yarn (including drawn false twisted yarn of POY), air jet yarn, push-in yarn, knit denitted yarn, and the like. In addition, other fibers such as natural fibers and synthetic fibers such as natural fibers such as cotton, wool, hemp and silk, cupra, and the like are usually used in an amount of 50% by weight or less within a range not to impair the object of the present invention. Viscose, polynosic, purified cellulose, acetate, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, various man-made fibers such as nylon and acrylic, as well as their copolymerized types, and the same or different polymers Blending (core yarn, silospan, silofil, hollow spindle, etc.), covering (single, double), low shrinkage yarn with boiling water shrinkage of about 3 to 10% or For example, blending, twisting, and false twisting with a high shrinkage yarn having a boiling water shrinkage of about 15 to 30% ( Degrees difference false twisting, composite or the like in the draw texturing of the POY), or may be used together with 2 feed air blasting, etc. means. The present invention is characterized in that a fiber base fabric is made of such a latently crimp-expressing polyester fiber. The fiber base fabric of the present invention is composed of one or more of a woven fabric, a knitted fabric, and a nonwoven fabric, and has a basis weight of 50 to 200 g / m ^2, preferably 50 to 150 g / m ^2. , The strength is insufficient, and when it exceeds this, the texture becomes hard.
The content of the latent crimp developing polyester fiber in the fiber base fabric is optimally 100% by mass, preferably 10% or more, particularly preferably 20% or more, and more preferably 30% or more, and is preferably used for a knitted fabric. Is 10% or more, especially 15% or more,
The content is more preferably 20% or more, and preferably 20% or more, particularly 30% or more, and more preferably 40% or more for woven or nonwoven fabrics. The fibers to be mixed with the latently crimp-expressing polyester fibers include other fibers such as natural fibers and synthetic fibers, for example, natural fibers such as cotton, wool, hemp and silk, cupra, viscose, polynosic, and purified cellulose. Polyester fiber such as acetate, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, nylon (aliphatic nylon such as nylon 6 or 66), acrylic, polyolefin (polyethylene or polypropylene, etc.), polyurethane, polyacrylonitrile, vinyl Various artificial fibers such as coalesced fibers and the like, and copolymer fibers of these and composite fibers (side-by-side type, eccentric sheath-core type, etc.) using the same or different polymers are used. Mixed by means such as knitting, weaving and needle punching It may be Re. Particularly, a mixture of a disperse dye-stainable fiber, preferably a cellulose fiber such as cupra or a nylon fiber, and a latent crimp-expressing polyester fiber is used, and only the disperse dye-stainable fiber is subjected to one-sided dyeing. In the case of mixing with cupra, for example, which does not dye polyester fibers, when dyed with reactive dyes or direct dyes, and when mixed with nylon fibers, dyed with acid dyes, the problem of transfer sublimation of disperse dyes to the synthetic resin coating layer is a problem of sublimation. Is avoided because it is avoided. In the present invention, the fiber base fabric is constituted by using the latent crimp developing polyester fiber. The latent crimp developing polyester fiber has a twist coefficient K represented by the following formula of 3000 to 32000. , Preferably 70
00 to 25000, more preferably 7000 to 230
Twisting at 00 is more effective in imparting peeling durability during repeated expansion and contraction. Twist coefficient K = T × D ^1/2 T: Twist number (T / m) D: Fiber fineness (dtex) In producing a knitted fabric, for example, if both the warp and the weft are used in the woven fabric, the weft is excellent. However, if necessary, it may be used for one of the warp and the weft, and in this case, excellent peeling durability at the time of repeated expansion and contraction is obtained only in the used direction. Can be Further, as the woven structure, taffeta, twill, satin and their changed structures can be used. As the knitting structure, a tricot knitting machine, a Russell knitting machine, or a circular knitting machine can be used as the knitting machine, and the dtex, knitting model, and gauge to be used may be appropriately selected depending on the thickness of the yarn to be used and the purpose of the product. As a knitting structure, a tricot knitting machine has a half reed structure of two reeds, a satin structure, or a changed structure formed by a combination of these structures, a Russell knitting machine has a power net structure, a satin net structure,
Examples include, but are not limited to, smooth and milled tissues. In particular, in a warp knitted fabric, a disperse dye-contaminated fiber is used at the front and a latent crimp-expressing polyester fiber is used at the back (closed stitches are preferable to open stitches).
The directions of swinging the front and back may be the same or different. ) And the latent crimp developing polyester fiber is located in the intermediate layer of the knitted fabric, so that single dyeing of only the disperse dye stain type fiber is sufficient, and the problem of migration and sublimation of the disperse dye is avoided. The density is preferably 40 to 80 wales and 60 to 90 courses, and the gauge is 22 to 3
6 gauge is preferred. Also, if necessary, the fiber base fabric
In order to obtain the anchoring effect of the synthetic resin coating layer, the surface on which the synthetic resin coating layer is formed may be raised, and the raised may be before or after dyeing. The synthetic leather of the present invention may be produced by either a wet method or a dry method. Here, the wet method means that a woven or knitted fabric or a non-woven fabric is coated with a synthetic resin dissolved in a predetermined concentration in a solvent, solidified in a coagulation bath containing a poor solvent, and sponge-like in the resin layer. Is a method in which fine communication holes are created, followed by washing and drying steps to produce a product.The dry method is a known method of coating a woven or knitted fabric or nonwoven fabric with a synthetic resin dissolved in a solvent at a predetermined concentration in a known concentration. A method such as knife-on-roll coating, roll-on-roll coating or the like, and a direct coating method in which a solvent is volatilized and solidified by evaporating the solvent, or a resin is applied to a release paper by a known coating method and dried to form a skin layer. Is formed. As the release paper here, silicone type,
There is a polypropylene type and the like, and the surface treatment shape also includes a flat type, an enamel type, a mat type and an emboss type, but is not limited. Next, there is a laminating method in which a two-pack type polyurethane resin-based adhesive is applied onto the skin layer by the above-mentioned known coating method, bonded to a woven or knitted fabric or a nonwoven fabric by thermocompression bonding and dried to obtain a product. The synthetic resin used in the present invention may be any resin that has adhesiveness to a woven or knitted fabric or a nonwoven fabric and forms a flexible film, such as an acrylic resin, a urethane resin, an acrylic / vinyl chloride copolymer resin, and an acrylic resin. / Vinyl acetate copolymer resin or the like is used. Embodiments of the present invention will be described below in detail with reference to embodiments, but the present invention is not limited to the embodiments. In addition, physical property evaluation was performed by the following methods. (1) Bending resistance: Measured according to JIS-L-1096 (45 ° cantilever method). The larger the value, the harder the texture. (2) Peeling durability during repeated expansion and contraction: 200 mm x 50
The both ends of a synthetic leather sample of mm size are repeatedly gripped with a gripping length of 20 mm with a stretching tester (De-Matcher), and repeatedly stretched 15% at a rate of 60 times / min. The number of occurrences was evaluated. (3) Intrinsic viscosity: intrinsic viscosity [η] (dl /
g) is a value obtained based on 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.
Is a value obtained by dividing the viscosity of the solvent by the viscosity of the solvent measured at the same temperature, and is defined as a relative viscosity. C
Is the polymer concentration in g / 100 ml. Since it is difficult to measure the intrinsic viscosities of the composite multifilaments using polymers having different intrinsic viscosities, it is difficult to measure each of the two types of polymer under the same spinning conditions as the composite multifilaments. The yarn was spun alone, and the intrinsic viscosity measured using the obtained yarn was defined as the intrinsic viscosity of the composite multifilament. (4) Initial tensile resistance: JIS-L-10
13; 0.088 per unit fineness of the sample according to the test method for chemical fiber filament yarn and the test method for initial tensile resistance
A tensile test was performed by applying an initial load of 2 cN / dtex, and the initial tensile resistance (cN / dt) was obtained from the obtained load-elongation curve.
ex) was calculated, and an average value of 10 times was obtained. (5) Stretch elongation rate, stretch elastic modulus: JIS-L-109
0: Measured according to the synthetic fiber filament bulked yarn test method, elasticity test method, and method A, calculate the elasticity (%), the elasticity (%), and calculate the average value of 10 times. Was. The elongation and the elongation and the elongation of the actual crimp were measured at a temperature of 20 ± 2 ° C for the sample unwound from the winding package.
The measurement was performed after standing for 24 hours in an environment of a humidity of 65 ± 2%. The stretch elongation and stretch elasticity after the hot water treatment were as follows.
A sample that was air-dried and dried for 4 hours was used. (6) Heat Shrinkage Stress: Using a thermal stress measuring device (manufactured by Kanebo Engineering Co., Ltd., trade name: KE-2), cut a sample into a length of 20 cm, connect both ends to form a ring, and load it into the measuring device. And the initial load is 0.044 cN / dt
ex, the shrinkage stress was measured at a heating rate of 100 ° C./min.
Read the heat shrinkage stress at 00 ° C. <Production of latent crimp developing polyester fiber> Side-by-side composite multifilaments having different intrinsic viscosities were produced according to Production Examples 1 to 4 below. Table 1 shows the physical property values of the obtained fibers. << Production Example 1 >> Two types 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 /
The draw ratio was set such that the fineness after stretching was 56 dtex, and the fiber was twisted to obtain a side-by-side composite multifilament of 56 dtex / 12f. The intrinsic viscosity of the obtained composite multifilament is [η] =
0.90, and [η] = 0.70 on the low viscosity side. Table 1 shows the initial tensile resistance, the stretch / elongation / stretch elasticity of the actual crimp, the stretch / elongation / stretch elasticity after hot water treatment, and the heat shrinkage stress at 100 ° C. Production Example 2 A side-by-side 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, Stretch Elongation Rate of Obvious Crimp / Stretch Elasticity, Stretch Elongation Rate After Hot Water Treatment /
Table 1 shows the elastic modulus and the heat shrinkage stress at 100 ° C. << Production Example 3 >> Two types of polytrimethylene terephthalate having different intrinsic viscosities from Production Example 1 were used, and 56 dtex / 12f was prepared in the same manner as in Production Example 1.
Was obtained.
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. Initial Tensile Resistance, Stretch Elongation / Stretch Elasticity of Applicable Crimp, Stretch Elongation / Stretch Elasticity after Hot Water Treatment, 100 ° C.
Are shown in Table 1. Production Example 4 56 dtex / 12 using two types of polyethylene terephthalate having different intrinsic viscosities
Thus, a side-by-side composite multifilament of f was obtained. The intrinsic viscosity of the obtained composite multifilament was [η] = 0.66 on the high viscosity side and [η] = 0.50 on the low viscosity side.
Met. Initial tensile resistance, stretching / extension rate of apparent crimp / stretching elasticity, stretching / extension rate after hot water treatment / stretching elasticity, 10
Table 1 shows the heat shrinkage stress at 0 ° C. [Table 1] Examples 1-3, Comparative Example 1 The composite filaments obtained in each of the production examples were twisted (800 T / m) and used for warp and weft, with a warp density of 136 / 2.54 cm and a weft. Woven in a taffeta having a density of 104 strands / 2.54 cm (only Example 2 has a density of 111 strands / 2.54 cm, a weft density of 85 strands / 2.54 cm), and uses this as a fiber base fabric (basis weight 80 g / m ² ). Thereafter, synthetic leather was manufactured in the steps (1) to (8).
Note that the composite filament of Production Example 1 was used in Example 1 and Production Example 2
The composite filament of Example 2 is the composite filament of Example 3, the composite filament of Production Example 3 is Example 3, and the composite filament of Production Example 4 is Comparative Example 1. (1) Water-repellent treatment of the fiber base fabric The fiber base fabric is immersed in the following aqueous solution and then squeezed with a rubber roll to a draw ratio of 40.
% And heat-treated at 150 ° C for 2 minutes.・ 1.8 parts of Asahigard LS-317 (Fuso-based water repellent manufactured by Meisei Chemical Co., Ltd.) ・ 99.2 parts of water (2) Coating of synthetic resin The following composition is water-repelled by (1) One surface of the prepared fiber base fabric was coated with a knife coater. The thickness of the synthetic resin film was 500 μmm. • Chris Bon 166 40 parts (Dai Nippon Ink Co., Ltd. 1-pack polyurethane) • Dimethylformamide 60 parts (3) Wet coagulation After immersion in 30 ° C. water for 5 minutes, desolvation treatment at 70 ° C. for 15 minutes Was done. (4) Heat treatment Heat treatment was performed at 150 ° C. for 2 minutes using a pin tenter. (5) Manufacture of skin layer An appropriate colored polyurethane resin was applied to release paper having a desired pattern using a bar coater so that the thickness after drying became 20 µm, to form a skin layer. 100 parts of one-pack type polyurethane resin 15 parts of methyl ethyl ketone 15 parts of pigment (6) Adhesive layer The above skin layer has a thickness of 10 after drying using a bar coater.
An adhesive layer was formed by applying an appropriately colored polyurethane resin to a thickness of μm, and then dried at 100 ° C. for 1 minute.・ 100 parts of two-pack type polyurethane resin ・ 15 parts of dimethylformamide ・ 15 parts of trifunctional aromatic isocyanate (7) Lamination of base layer and skin layer
And pressed together with a hot roll (392 kPa). (8) Peeling of Release Paper After laminating the skin layer and the fiber base cloth at 40 ° C. for 24 hours, the release paper was peeled off to obtain the synthetic leather of the present invention. The results of evaluating the physical properties of the obtained synthetic leather were as follows. That is, all of Examples 1 to 3 are 38 to 41.
mm softness and peeling durability during repeated expansion and contraction were 400 times or more, but Comparative Example 1 had 45 mm softness and 280 times peeling durability during expansion and contraction, Both the flexibility and the peeling durability during repeated expansion and contraction were poor. Comparative Example 2 The procedure of Example 1 was repeated, except that a polytrimethylene terephthalate filament having one component of intrinsic viscosity [η] = 0.76 was used instead of the composite filament. , Synthetic leather was produced. The performance of the obtained synthetic leather was 41 mm in softness and softness, and the peeling durability during repeated expansion and contraction was 210 times. As compared with Example 1, the peeling durability after repeated expansion and contraction was inferior. Example 4 Using a 28GG tricot knitting machine,
6dtex / 30f cupra multifilament yarn is placed on the front (tissue; 1-0 / 2-3) and back (tissue;
1-2 / 1-0; closed line), a half tricot was knitted in 83 courses on machine using the composite filament obtained in Production Example 1. Next, scouring was carried out by a conventional method, only cupra was dyed with a reactive dye, and after brush raising, finishing setting was performed. Using this as a base cloth, a synthetic leather was subsequently produced in the same manner as in Example 1. The performance of the obtained synthetic leather was 39 mm in softness and softness, and the peeling durability during repeated stretching was 400 times or more. As in Example 1, both the softness and peeling strength during repeated stretching were excellent. Was. The synthetic leather according to the present invention is very soft and has excellent peeling durability even when used under such conditions as to be subjected to repeated stretching and contraction. Gloves, windbreakers, and other sports clothing applications.

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Claims (1)

Claims: 1. A synthetic leather comprising a synthetic resin coating layer formed on at least one surface of a fiber base fabric having a basis weight of 50 to 200 g / m ² , wherein the fibers constituting the fiber base fabric are provided. Is a latent crimp-expressing polyester fiber, which satisfies the following (a) to (c): (A) The initial tensile resistance is 10 to 30 cN / dtex. (B) The stretching and elongation of the actual crimp is 10 to 100%, and the stretching and elasticity is 80 to 100%. 1 to 0.5 cN /
dtex