JP2001316958A - Fabric for garment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject unconventional fabric having enough mechanical properties when wearing and excellent in ultraviolet translucency. SOLUTION: The fabric for garments is characterized by being based on an aliphatic polyester fiber composed of L-lactic acid and/or D-lactic acid as the main recurring unit (s) and having a tenacity of >=2 cN/dtex and boiling water shrinkage of 0-15%, and also characterized by being <=1.0 Abs in the maximum value of absorbance within the wavelength range of 290 to 390 nm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth for clothing mainly composed of aliphatic polyester fibers. More specifically, the present invention relates to a garment fabric suitable for use in summer, in which "sunburn" can be caused by sunlight while being worn, since it has almost no absorption in the ultraviolet wavelength region.

[0002]

2. Description of the Related Art Fibers made of a polymer having a benzene ring in a molecular chain such as polyethylene terephthalate have an effect of blocking an ultraviolet spectrum part contained in sunlight because the polymer itself absorbs ultraviolet rays. In addition, fibers containing inorganic particles such as titanium oxide and silica particles have an effect of shielding ultraviolet rays because the ultraviolet rays are scattered by the particles. In addition, fibers containing a large amount of organic dyes, which are aromatic compounds, because the dye molecules absorb ultraviolet light,
It has the effect of shielding ultraviolet rays. That is, when a fabric made of these fibers is worn, the body part covered with the fabric does not receive "tanning" due to ultraviolet rays, and therefore, it is preferable that the untanned portion has an unbalanced skin tone. There was nothing.

[0003] The concept of a fabric that transmits ultraviolet light has been proposed so far. For example, JP
Japanese Patent Application Laid-Open No. 1-93004 proposes a swimsuit made of ultraviolet transmitting fibers, but does not disclose a method of actually implementing the invention. Further, Japanese Patent Application Laid-Open No. 9-26816 proposes a tan pattern forming tool in which an ultraviolet ray transmitting sheet is attached to a punched portion. In this case, ultraviolet light was not transmitted except for the punched portion.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cloth for clothing which has sufficient strength and shrinkage properties for wearing and is excellent in ultraviolet transmittance.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to mainly use L-lactic acid and / or D-lactic acid having a strength of 2 cN / dtex or more and a boiling water shrinkage of 0 to 15%. The problem can be solved by a cloth for clothing mainly composed of aliphatic polyester fibers as a unit, wherein the maximum value of absorbance in the wavelength range of 290 to 390 nm is 1.0 Abs or less. It is more preferable that the maximum value of the absorbance is 0.5 Abs or less.

In this case, it is preferably applied that the fiber is crimped and the crimp restoring ratio CR value is 10 to 40%. In addition, it is substantially free from inorganic particles in the fiber and is dyed with a disperse dye, and the content of the disperse dye in the fiber is 0.01 to 10 wt% from the viewpoint of good ultraviolet transmittance. It is preferably applied. Fabrics made with these fibers have good UV transmission.

[0007] These fabrics can be particularly preferably used as swimwear in view of their excellent ultraviolet transmittance.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION
The maximum value of absorbance in the wavelength range of 390 nm is 1.0
It is important that it be Abs. The wavelength range of 290 to 390 nm is an ultraviolet region, and if the maximum value of the absorbance in this region is larger than 1.0 Abs, the ultraviolet light is blocked by the cloth. The maximum value of the absorbance is preferably 0.5 Abs or less, and most preferably 0.3 Abs or less.

The fibers mainly constituting the clothing fabric of the present invention are composed of polylactic acid which is an aliphatic polyester having L-lactic acid and / or D-lactic acid as a main repeating unit.
Polylactic acid, which is an aliphatic polyester, does not contain an aromatic ring in the molecular chain and does not substantially absorb ultraviolet light, and thus is suitable for obtaining the ultraviolet-permeable clothing fabric of the present invention.

The method for producing polylactic acid includes L-lactic acid and / or
Alternatively, a two-stage lactide method in which lactide, which is a cyclic dimer, is once produced from D-lactic acid as a raw material, followed by ring-opening polymerization, and direct dehydration condensation in a solvent using L-lactic acid and / or D-lactic acid as a raw material Is known as a one-step direct polymerization method. The polylactic acid used in the present invention may be obtained by any production method.

The higher the average molecular weight of the polylactic acid, the better, usually at least 50,000, preferably at least 10
10,000, preferably 100,000 to 300,000. If the average molecular weight is lower than 50,000, it is not preferable because only a fiber having low strength physical properties can be obtained.

The melting point of polylactic acid is 100 ° C. or higher, preferably 140 ° C. or higher, and most preferably 160 ° C. or higher. When the melting point is less than 100 ° C., poor stretchability due to occurrence of fusion between single yarns, dyeing, heat setting,
Since the quality of the product is extremely low, such as the occurrence of melting defects during frictional heating, the product cannot be used for clothing fabrics. Here, the melting point means the peak temperature of the first run melting peak obtained by DSC measurement.

Further, the polylactic acid in the present invention may be a copolymerized polylactic acid obtained by copolymerizing other components having an ester-forming ability in addition to L-lactic acid and D-lactic acid. The copolymerizable components include glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid,
-Other than hydroxycarboxylic acids such as hydroxycaproic acid, ethylene glycol, propylene glycol, butanediol, neopentyl glycol, polyethylene glycol, glycerin, compounds containing a plurality of hydroxyl groups in the molecule such as pentaerythritol or derivatives thereof, Compounds containing a plurality of carboxylic acid groups in the molecule, such as adipic acid, sebacic acid, and fumaric acid, and derivatives thereof are included. It is desirable that the copolymer component does not contain an aromatic ring in the molecular structure. Further, in order to maintain good ultraviolet transmittance and mechanical properties, 80% by mole or more of the aliphatic polyester is L-lactic acid and / or D-lactic acid.
Desirably, it is composed of a lactic acid component.

In order to reduce the melt viscosity, an aliphatic polyester polymer such as polycaprolactone, polybutylene succinate and polyethylene succinate can be used as an internal plasticizer or as an external plasticizer. Further, inorganic fine particles and organic compounds as a matting agent, a deodorant, a flame retardant, a yarn friction reducing agent, an antioxidant, a coloring pigment and the like can be added as required.

The aliphatic polyester fiber used in the present invention has a fiber strength of 2 cN / dtex or more and a boiling water shrinkage of 0 to 15%. Strength 2cN /
If it is less than dtex, it is not preferable because yarn breakage stops during weaving and knitting, and the strength of the fabric and knitted fabric cause a decrease in product strength. More preferably, 3 cN /
dtex or more, most preferably 4 cN / dtex
That is all. If the boiling water shrinkage is greater than 15%,
When hot water treatment such as scouring and dyeing is performed, the shrinkage becomes large, and it becomes difficult to spread the fabric, and the texture tends to harden, which is not preferable.

The aliphatic polyester fiber used in the present invention has been subjected to crimping and has a crimp restoring ratio CR value of 10%.
It is preferably about 40%. By using crimped fibers, stretchability is improved, and a fabric suitable for clothing fabric can be obtained. The crimping of the fiber
Although a thread processing method such as false twisting, indentation shaping, and knit denitration can be applied, false twisting is most preferable from the viewpoints of good crimping characteristics and simple process.

If the crimp restoring ratio CR value is less than 10%, it is not preferable because crimping occurs over time.
On the other hand, if it exceeds 40%, it is not preferable because the texture of the fabric is increased. The crimp restoration rate CR value is more preferably 15 to 30%.

It is desirable that the aliphatic polyester fiber used in the present invention does not substantially contain inorganic particles in the fiber. It is not preferable to contain inorganic particles such as titanium oxide, silica, and calcium carbonate, because ultraviolet rays are scattered and transmission of the ultraviolet rays into the swimsuit may be suppressed.

When the clothing fabric of the present invention is dyed with a disperse dye, the content of the disperse dye in the fiber is desirably 0.01 to 10% by weight. If the content of the disperse dye is more than 10 wt%, the ultraviolet rays are absorbed, and the transmission of the ultraviolet rays through the clothing fabric may be suppressed. 0.01wt
When the amount is less than%, the coloring may be insufficient. When dyed with a disperse dye, the content in the fiber is more preferably 0.1 to 8 wt%, and most preferably 1 to 5 wt%.

The clothing fabric of the present invention can be used in the form of a woven or knitted fabric, and is suitable for clothing that can be "tanned" by sunlight while worn. Therefore, to satisfy this object, the aliphatic polyester is preferably used in the fabric of the present invention in an amount of 50 wt% or more, more preferably 80 wt% or more. Other fibers to be mixed include natural fibers such as cotton, hemp, wool, and synthetic and semi-synthetic fibers such as rayon, acetate, polyester, nylon, and urethane in consideration of the comfort and handling characteristics of summer clothing. Any of these can be used.

The form of the fiber yarn constituting the fabric is a long fiber,
Short fibers or any combination of these may be used. Also,
These fibers may be flat yarns or crimped yarns.

In addition, examples of summer clothing using the fabric of the present invention include swimming-related clothing such as swimwear, pareos, and towels.
Examples include summer wear such as T-shirts, athletic shirts, polo shirts, short-sleeved shirts, hoodies, skirts, shorts, shorts, socks, and caps.

When the cloth for clothing of the present invention is used as a swimsuit, stretchability can be increased by cross-knitting polyurethane elastic yarns within a range that does not impair the gist of the present invention.
The type of knitted fabric is preferably a single circular knitted fabric, a double circular knitted fabric which is a circular knitted fabric, a tricot fabric which is a warp knitted fabric, or a Russell fabric, but is not limited thereto. .

[0024]

The present invention will be described in more detail with reference to the following examples. Each characteristic value in the examples was obtained by the following method. A. Ultraviolet absorbance (Abs) The reflectance spectrum of the knitted fabric sample was measured using a spectrophotometer (Co., Ltd.)
Measured using Shimadzu Corporation UV-2100), and
The maximum value of the absorbance in the wavelength range of 0 to 390 nm was defined as ultraviolet absorbance (Abs). B. Strength Tennile UCT-1 tensile tester manufactured by Orientec
00 type), sample length 20 cm, tensile speed 20 cm
The tensile test was performed under the conditions of / min, and the stress at the breaking point was defined as the fiber strength. C. Boiling water shrinkage (boil recovery) The sample is made into a skein of 10 turns, and 0.1 cN / dtex
The original length (L ₀ ) is measured under a load of. The skein of the sample is treated in a boiling water bath adjusted to 100 ° C. for 15 minutes, taken out, air-dried, and the length (L ₁ ) after treatment is measured under a load of 0.1 cN / dtex. The value obtained by the following equation was defined as the boiling water shrinkage (boiling yield).

Boiling yield (%) = ｛(L₀-L₁) / L₀｝ × 100 D. Crimping restoration rate (CR value) The fiber is skeined into 10 turns, and 90 ° C under no load, 2
Perform warm water treatment for 0 minutes. After air drying overnight, water at 20 ° C
Initial load of 0.0353 cN / dtex and 1.76
The actual load of cN / dtex is applied to the skein and the length of the skein after 2 minutes
Is measured (L ₀). Immediately remove the actual load and after 2 minutes
Measure the length again (L₁). Obtained by the following equation
The value was taken as the crimp restoration rate (CR value).

CR value (%) = {(L ₀ −L ₁ ) / L ₀ } × 100 Melting point PerkinElmer differential scanning calorimeter (DSC-7)
Was measured at a heating rate of 15 ° C./min, and the peak temperature of the obtained melting peak was defined as the melting point. F. Quantitative Determination of Dye Concentration in Fiber A solution was prepared by diluting the dye bath before dyeing used for dyeing with a mixed solvent of water: acetone = 1: 1 by 10 times, and U-3010 type spectrophotometer manufactured by Hitachi, Ltd. 500-7 using a total
The absorbance was measured in the 00 nm region to determine the wavelength (nm) at which the maximum peak was obtained and the absorbance LA (Abs) at that time. Similarly, the dyeing bath after dyeing after dyeing is treated with water:
A solution diluted 10-fold with a mixed solvent of acetone = 1: 1 was prepared, and the absorbance L at the previously determined maximum peak wavelength was determined.
B (Abs) was determined, and the dye concentration in the fiber was calculated by the following equation.

Dye concentration (wt%) = ｛(LA−LB) /
LA｝ × Dye concentration in bath (% owf) Using an ultraviolet-permeable polyethylene terephthalate fiber (Toray Co., Ltd. "Tetron" (registered trademark) 84T-36-H202),
Vertical yarn density 100 yarns / cm, weft yarn density 100 yarns / cm
And a standard cloth dyed under the following conditions is prepared. A knitted fabric sample to be worn on top of the standard cloth is overlaid and irradiated with ultraviolet rays for 40 hours using a fade meter (U48-AU) manufactured by Suga Test Instruments Co., Ltd. The discoloration and discoloration of the standard fabric were visually judged, and those in which discoloration and fading were clearly observed were rated as ◎, those in which discoloration were recognized were evaluated as ○, and those in which they were not recognized were evaluated as ×.

Dye: Dianix Navy Blue BNE Dye concentration: 1% owf Bath ratio: 1:20 Dyeing temperature: 130 ° C. × 1 hr Example 1 Polylactic acid containing no inorganic particles having a melting point of 168 ° C. and a weight average molecular weight of 120,000 Was dried in a vacuum dryer set at 105 ° C. for 12 hours. The dried chips were melted at a melter temperature of 220 ° C. by a pressure melter type spinning machine, introduced into a melt pack at a spinning temperature of 220 ° C., and spun out from a 0.23D-0.30 L die hole. The spun yarn was cooled by a chimney style at 20 ° C. and 30 m / min.
It was taken in to obtain an undrawn yarn. The variety of the obtained undrawn yarn was 80.5 dtex-36f.

The undrawn yarn was subjected to a 1 HR temperature of 90 ° C. and a 2 HR using a hot roller-hot roller drawing machine.
Temperature 120 ° C, stretching ratio 1.45 times, stretching speed 800m
/ Min. The obtained drawn yarn is pin-twisted under the conditions of a hot plate temperature of 130 ° C. and a number of false twists of 2500 T / m,
A false twisted yarn of 55.5 dtex-36f was used. The fiber properties are as shown in Table 1 and were excellent in mechanical properties, and did not cause any problems in fabric handling.

The obtained false twisted yarn was formed into a tricot knitted fabric by a warp knitting machine, and a swimsuit was prepared using the knitted fabric. The swimsuit had good stretchability and excellent wearing comfort. Further, the absorbance of the knitted fabric was 0.32 Abs, and the ultraviolet transmittance was extremely excellent. Example 2 A tricot knitted fabric obtained in the same manner as in Example 1 was dyed under the following dyeing conditions, and then a swimsuit was prepared. The dye concentration in the fiber was 5.8 wt%. The swimsuit had good stretchability and excellent wearing comfort. The absorbance of the knitted fabric was 0.62 Abs, and the ultraviolet transmittance was excellent.

Dye: Dianix Navy Blue BNE Dye concentration: 6% owf Bath ratio: 1:20 Dyeing temperature: 120 ° C. × 1 hr Example 3 Melt spinning was carried out in the same manner as in Example 1 to obtain 55.5 dte.
A drawn yarn of x-36f was obtained. The fiber properties were as shown in Table 1, and were excellent in mechanical properties and did not cause any problems in fabric handling.

The drawn yarn was used to form a tricot knitted fabric by a warp knitting machine, and a swimsuit was prepared using the knitted fabric. Although the stretchability of the knitted fabric was inferior to Examples 1 and 2, it was sufficient for wearing. Further, the absorbance of the knitted fabric was 0.24, and the ultraviolet transmittance was extremely excellent. Example 4 A tricot knitted fabric obtained in the same manner as in Example 3 was dyed under the following dyeing conditions, and then a swimsuit was prepared. The dye concentration in the fiber was 1.8 wt%. Although the stretchability of the knitted fabric was inferior to those of Examples 1 and 2, it was sufficient for wearing. Further, the absorbance of the knitted fabric was 0.41, and the ultraviolet transmittance was extremely excellent.

Dye: Dianix Navy Blue BNE Dye concentration: 2% owf Bath ratio: 1:20 Dyeing temperature: 120 ° C. × 1 hr Example 5 Melt spinning was carried out in the same manner as in Example 1 to obtain 55.5 dte.
A drawn yarn of x-36f was obtained. The fiber properties were as shown in Table 1, and were excellent in mechanical properties. 9
0wt%, 20d-4f polyurethane fiber 10wt
% Knitting was performed to prepare a tricot knitted fabric with a warp knitting machine.

When a swimsuit was prepared using the obtained knitted fabric, one having very good stretchability was obtained. The ultraviolet transmittance was as low as 0.88 Abs, and the ultraviolet transmittance was recognized. Comparative Example 1 Polyethylene terephthalate containing 0.05 wt% of titanium dioxide as inorganic particles and having a melting point of 262 ° C.
It dried for 5 hours with the vacuum dryer set to 150 degreeC. The dried chips were melted at a melter temperature of 285 ° C. by a pressure melter type spinning machine, introduced into a melt pack at a spinning temperature of 290 ° C., and spun from a 0.23D-0.30 L die hole. The spun yarn was cooled by a 30 m / min chimney wind, and after applying an oil agent and converging,
It was pulled at 00 m / min to obtain a drawn yarn. The type of the obtained undrawn yarn was 100 dtex-36f.

The undrawn yarn was subjected to false twisting by a friction type false twisting machine at a hot plate temperature of 210 ° C. and a draw ratio of 1.8 times. The fiber physical properties are as shown in Table 2, and those having excellent mechanical properties were obtained. The obtained false twisted yarn was made into a tricot knitted fabric by a warp knitting machine, and a swimsuit was prepared using this knitted fabric. The swimsuit had good stretchability and excellent wearing comfort.

When the absorbance of the knitted fabric was measured, it was 1.88 Abs.
And a high value, and no ultraviolet transmittance was observed. Comparative Example 2 A knitted fabric and a swimsuit made of the same were prepared in the same manner as in Example 2 except that dyeing was performed under the following conditions. The dye content in the fiber was 12.0 wt%.

When the absorbance of the knitted fabric was measured, it was 1.26 Abs.
And a high value, and no ultraviolet transmittance was observed.

Dye: Dianix Navy Blue BNE Dye concentration: 20% owf Bath ratio: 1:20 Dyeing temperature: 120 ° C. × 1 hr Comparative Example 3 Titanium dioxide slurried with the polylactic acid polymer described in Example 1 and ethylene glycol Kneading was performed using a vented twin-screw extruder. The amount of titanium dioxide in the fiber was 4.8 wt%.

Using this titanium dioxide-containing polylactic acid,
In the same manner as in Example 1, a false twisted yarn of 55.5 dtex-36f was obtained. The fiber physical properties are as shown in Table 2, and those having excellent mechanical properties were obtained.

When the absorbance of the knitted fabric was measured, it was 1.55 Abs.
And a high value, and no ultraviolet transmittance was observed. Comparative Example 4 An undrawn yarn of 80.5 dtex-36f was obtained in the same manner as in Example 1, and a tricot knitted fabric was prepared using the undrawn yarn. In the knitting process, yarn feed yarn breakage and knitting of the knitted fabric frequently occurred, and the product passed through the process was defective. Further, when dyeing was performed, the fibers were significantly shrunk, and the fabric texture became extremely coarse and hard, making the fabric unsuitable for use in swimwear.

[0041]

[Table 1]

[0042]

Industrial Applicability The clothing fabric of the present invention has sufficient strength and shrinkage properties for wearing, and particularly when used for water wear, a swimsuit having good wearing comfort can be obtained. In addition, since the absorption in the ultraviolet region is low, the ultraviolet transmittance of the cloth is high, and a clothing cloth that can be "tanned" while worn can be obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D03D 15/00 D03D 15/00 A 102 102Z D04B 1/16 D04B 1/16 21/00 21/00 B / / A41D 7/00 A41D 7/00 Z F term (reference) 4L002 AA05 AA07 AB04 AC01 AC02 CA01 DA04 EA00 FA01 4L036 MA05 MA33 PA05 RA04 UA10 UA25 4L048 AA20 AA26 AA42 AA50 AA51 AB07 AB09 AB21 AC01 AC07 AC04 CA03

Claims (5)

[Claims] (1) L-lactic acid and / or D-lactic acid having a strength of 2 cN / dtex or more and a boiling water shrinkage of 0 to 15%.
A cloth for clothing mainly composed of an aliphatic polyester fiber having lactic acid as a main repeating unit, and having a maximum absorbance of 1.0 Abs or less in a wavelength range of 290 to 390 nm. 2. The clothing fabric according to claim 1, wherein the fibers are subjected to a crimping process and have a crimp restoring ratio CR of 10 to 40%. 3. The garment fabric according to claim 1, wherein the fibers substantially do not contain inorganic particles. 4. The garment fabric according to claim 1, wherein the garment is dyed with a disperse dye, and the content of the disperse dye in the fiber is from 0.01 to 10% by weight. 5. The clothing fabric according to claim 1, wherein said fabric is a knitted fabric for water wear.