JP2008190057A - Clothes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide environment consideration type clothes, excellent in resistance to moist heat, color fastness, or the like, in spite of being made of fibers using biomass polymer for one part. <P>SOLUTION: The clothes are obtained by using a core-sheath type conjugated fiber composed of a core part of a biomass polymer and a sheath part of an oil-based polymer, and has a strength retention of ≥85% after 500 h under an environment of 50°C×95%RH. The color fastness to friction of the clothes is preferably ≥4th grade. The oil-based polymer of the sheath part is preferably copolyethylene terephthalate which has as the main ingredient of polyethylene terephthalate or ethylene terephthalate unit, and is obtained by copolymerizing 5-20 mol% of at least one ingredient selected from isophthalic acid, cyclohexane dimethanol, and cyclohexane dicarboxylic acid. The biomass polymer of the core part is preferably polylactic acid. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a garment comprising a composite fiber using a biomass polymer in the core, excellent in heat and moisture resistance, dry heat resistance, fastness to dyeing and the like, and capable of reducing the amount of carbon dioxide generated at the stage of production and disposal. .

  Conventionally, synthetic fibers have been widely used from the viewpoint of versatility, and have been used in various fields.

  However, synthetic fibers are mainly made from limited precious fossil resources such as petroleum, and there are concerns about resource shortages in the future. In addition, it is hardly decomposed in the natural environment, and when it burns, it generates high heat, causing severe damage to the incinerator, etc., and in addition to increasing carbon dioxide emissions, disposal processing becomes a problem. In general, the idea that reducing the amount of petroleum-based synthetic fibers used in the industry itself is environmental protection has become widespread.

In recent years, biomass polymer absorbs carbon dioxide at the stage of cultivating the plant that is the raw material, so the advantage of carbon neutral that it is offset even if carbon dioxide is generated at the time of combustion has attracted attention. Development is progressing. For example, Patent Document 1 proposes an upper garment using biomass polymer fibers.
JP 2000-265309 A

  In apparel use, it is used in various environments, and it performs processing such as washing and ironing, so its physical properties and dyeing fastness are high levels of tearing and bursting strength, abrasion resistance, which do not cause problems in practical use, Dimensional stability is required. However, when synthetic fibers made of biomass polymer are used, the mechanical properties of petroleum-based synthetic fibers are lower than those of petroleum-based synthetic fibers because of the effect of wet heat treatment such as scouring and dyeing in the dyeing process and dry heat treatment such as drying and heat setting. And the fastness to dyeing such as the fastness to friction were inferior. Furthermore, when used in washing and drying, especially tumbler drying, or when left in a high-temperature environment such as in a car or outdoors while wet with sweat or rain, it gradually deteriorates, resulting in reduced strength. was there.

  The present invention provides an environment-friendly garment that solves the above-mentioned problems and is excellent in moisture and heat resistance and dyeing fastness despite being partly made of fibers using biomass polymer. This is a technical issue.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have determined that by using a core-sheath type composite fiber in which the core part is made of a biomass polymer and the sheath part is made of a petroleum-based polymer, the heat-and-moisture resistance and dyeing fastness are achieved. The present invention has been achieved by finding that an environment-friendly garment excellent in degree and the like can be obtained.

That is, the gist of the present invention is as follows.
(1) A core-sheath type composite fiber having a core part made of biomass polymer and a sheath part made of a petroleum polymer is used, and the strength retention after 500 hours in a 50 ° C. × 95% RH environment is 85% or more. Clothing characterized by that.
(2) The clothing according to (1) above, wherein the dyeing fastness to friction is grade 4 or higher.
(3) The clothing according to (1) or (2) above, wherein the petroleum-based polymer in the sheath is polyethylene terephthalate.
(4) The sheath-based petroleum-based polymer is a copolymerized polyethylene terephthalate having an ethylene terephthalate unit as a main component and 5 to 20 mol% of at least one component copolymerized among isophthalic acid, cyclohexanedimethanol and cyclohexanedicarboxylic acid. The clothing according to (1) or (2) above, wherein
(5) The clothing according to any one of (1) to (4) above, wherein the biomass polymer in the core is polylactic acid.

  Since the garment of the present invention uses a fiber whose core is formed of a biomass polymer, the amount of carbon dioxide generated at the stage of production and disposal is reduced compared to a garment composed only of conventional petroleum-based synthetic fibers. In addition, it is possible to improve the heat and moisture resistance, the fastness to dyeing, and the like from the garment using the fibers of the biomass polymer alone.

  Hereinafter, the present invention will be described in detail.

  The apparel of the present invention uses a core-sheath type composite fiber having a core part made of a biomass polymer and a sheath part made of a petroleum polymer.

  First, the petroleum-based polymer constituting the sheath of the core-sheath composite fiber used in the present invention is not particularly limited as long as it can be melt-spun. Specifically, polyesters represented by polyalkylene terephthalates such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polytrimethylene terephthalate (PTT), nylon 6, nylon 66, nylon 46, nylon 11 and nylon 12 Polyamides represented by polypropylene, polyolefins represented by polypropylene and polyethylene, polychlorinated polymers represented by polyvinyl chloride and polyvinylidene chloride, polytetrafluoroethylene and copolymers thereof, fluorine represented by polyvinylidene fluoride, etc. System fibers and the like. Of these, low cost polyesters and polyamide polymers are preferred. More preferably, as the biomass polymer, since there are many aliphatic polyesters, polyesters such as PET are preferable in consideration of compatibility. In view of viscosity, thermal characteristics, and compatibility, polyester polymers include aromatic dicarboxylic acids such as isophthalic acid and 5-sulfoisophthalic acid, adipic acid, succinic acid, suberic acid, sebacic acid, and dodecanedioic acid. Aliphatic dicarboxylic acids and aliphatic diols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxypentanoic acid , Hydroxycarboxylic acids such as hydroxyheptanoic acid and hydroxyoctanoic acid, and aliphatic lactones such as ε-caprolactone may be copolymerized. Among these, copolymerized PET obtained by copolymerizing at least one component among isophthalic acid (IPA), cyclohexanedimethanol (CHDM), and cyclohexanedicarboxylic acid (CHDA) is preferable as the copolymerization component. The copolymerization amount is preferably 5 to 20 mol%, more preferably 5 to 10 mol%. By making the sheath part a copolymer polyester of the above components, the reaction temperature during the polycondensation reaction can be lowered, and furthermore, the temperature during spinning can also be lowered, so that the melting point of the biomass polymer used for the core part is reduced. When it is lower than the petroleum polymer in the sheath, thermal decomposition of the core biomass polymer that occurs during spinning can be suppressed. Moreover, the strong fall in a high humidity environment like 50 degreeC x 95% RH can also be suppressed. In order to further improve the strength, melt-polymerized polyester (prepolymer) chips are heated at a temperature below the melting point of the polyester under reduced pressure or under an inert gas flow to solid-phase polymerize the polymer obtained by increasing the degree of polymerization. It may be used.

  Next, the biomass polymer constituting the core of the core-sheath composite fiber used in the present invention is not particularly limited as long as it can be melt-spun. Specifically, polymers obtained by chemically polymerizing biomass-derived monomers such as polylactic acid, polytrimethylene terephthalate (PTT) and polybutylene succinate (PBS), and polyhydroxyalkanoates (PHA) such as polyhydroxybutyric acid ) And other microorganism-producing polymers. Among these, polylactic acid, which has stable heat resistance and is relatively mass-produced, is preferable. Examples of polylactic acid include poly D-lactic acid, poly L-lactic acid, poly D-lactic acid which is a copolymer of poly D-lactic acid and poly L-lactic acid, and a mixture of poly D-lactic acid and poly L-lactic acid (stereo Complex), a copolymer of poly D-lactic acid and hydroxycarboxylic acid, a copolymer of poly L-lactic acid and hydroxycarboxylic acid, poly D-lactic acid or poly L-lactic acid, aliphatic dicarboxylic acid and aliphatic diol It is preferable to use a copolymer or a blend thereof. The polylactic acid is one in which L-lactic acid and D-lactic acid are used alone or in combination as described above. Among them, the melting point is 120 ° C. or more, and the heat of fusion is 10 J / g or more. It is preferable that Poly L-lactic acid and poly D-lactic acid, which are homopolymers of polylactic acid, have a melting point of about 180 ° C., but in the case of a copolymer of D-lactic acid and L-lactic acid, the proportion of any component is 10 mol. When it is about%, the melting point is about 130 ° C.

  Furthermore, when the proportion of any of the components is 18 mol% or more, the melting point is less than 120 ° C. and the heat of fusion is less than 10 J / g, which is almost completely amorphous. When such an amorphous polymer is used, it becomes difficult to heat-stretch particularly in the production process, and it becomes difficult to obtain high-strength fibers. Even if fibers are obtained, the heat resistance and wear resistance are poor. Since it becomes a thing, it is not preferable. Therefore, as polylactic acid, L / D or D / which is the content ratio (molar ratio) of L-lactic acid and D-lactic acid indicated by the content ratio of L-lactic acid or D-lactic acid when polymerizing using lactide as a raw material. L is preferably 82/18 or more, more preferably 90/10 or more, and even more preferably 95/5 or more. In addition, among polylactic acid, a mixture (stereocomplex) of poly D-lactic acid and poly L-lactic acid as described above has a high melting point of 200 to 230 ° C., so that the process passability after forming into a fabric is good. Moreover, since ironing is also possible, it is particularly preferable. In the case of a copolymer of polylactic acid and hydroxycarboxylic acid, specific examples of hydroxycarboxylic acid include glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxypentanoic acid, hydroxyheptanoic acid, and hydroxyoctanoic acid. Can be mentioned. Of these, the use of hydroxycaproic acid or glycolic acid is preferable from the viewpoint of cost. In the case of a copolymer of polylactic acid, aliphatic dicarboxylic acid and aliphatic diol, the aliphatic dicarboxylic acid and aliphatic diol include sebacic acid, adipic acid, dodecanedioic acid, trimethylene glycol, 1,4-butane. Examples thereof include diol and 1,6-hexanediol. Thus, when making polylactic acid copolymerize another component, it is preferable that polylactic acid shall be 80 mol% or more. If it is less than 80 mol%, the crystallinity of the copolymerized polylactic acid tends to be low, the melting point tends to be less than 120 ° C., and the heat of fusion tends to be less than 10 J / g.

  The molecular weight of the polylactic acid is preferably 1 to 100 (g / 10 min) as measured by a temperature of 210 ° C. and a load of 2160 g according to the ASTM D-1238 method used as a molecular weight index. More preferably, it is 5-50 (g / 10min). By setting the melt flow rate within this range, strength, wet heat decomposability, and wear resistance are improved. For the purpose of enhancing the durability of polylactic acid, a terminal blocking agent such as an aliphatic alcohol, a carbodiimide compound, an oxazoline compound, an oxazine compound, or an epoxy compound may be added to polylactic acid.

  If necessary, various additives, thickeners and known nucleating agents may be added to the above petroleum-based polymers and biomass polymers as long as the effects of the present invention are not impaired. Can do. Specifically, carbon black, calcium carbonate, silicon oxide and silicate, zinc white, high-site clay, kaolin, basic magnesium carbonate, mica, talc, quartz powder, diatomaceous earth, dolomite powder, titanium oxide, zinc oxide , Antimony oxide, barium sulfate, calcium sulfate, alumina, calcium silicate, boron nitride, behenic acid amide and other aliphatic amide compounds, aliphatic urea compounds, benzylidene sorbitol compounds, crosslinked polymer polystyrene, rosin metal salts And glass fiber and whiskers. These may be added as they are, or may be added after necessary treatment as a nanocomposite. In order to reduce the price and achieve a good physical property balance, an inorganic filler is preferably blended. Also preferred is a crystal nucleating agent.

  Moreover, a plasticizer can also be mix | blended with said petroleum-type polymer and biomass polymer as needed if it is a range which does not impair the effect of this invention. By blending a plasticizer, it is possible to reduce the melt viscosity at the time of heat processing, particularly at the time of extrusion processing, to suppress a decrease in molecular weight due to shearing heat generation and the like, and in some cases, an improvement in crystallization speed can be expected. The type of plasticizer is not particularly limited, but ether-based plasticizers, ester-based plasticizers, phthalic acid-based plasticizers, phosphorus-based plasticizers, etc. are preferable, and ether-based plastics are excellent in compatibility with polyesters. A plasticizer and an ester plasticizer are more preferable. Specific examples of the ether plasticizer include polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Examples of ester plasticizers include esters of aliphatic dicarboxylic acids and aliphatic alcohols. Examples of aliphatic dicarboxylic acids include oxalic acid, succinic acid, sebacic acid, adipic acid, and the like. Examples of aliphatic alcohols include monohydric alcohols such as methanol, ethanol, n-propanol, isopropanol, n-hexanol, n-octanol, 2-ethylhexanol, n-dodecanol, stearyl alcohol, ethylene glycol, 1, 2 -Dihydric alcohols such as propylene glycol, 1,3-propylene glycol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol, neopentyl glycol, polyethylene glycol, Glycerin, trimethylol propane, may be mentioned polyhydric alcohols such as pentaerythritol. Also, two or more kinds selected from copolymers, di-copolymers, tri-copolymers, tetra-copolymers, or the like, or homopolymers, copolymers, etc. composed of combinations of two or more of the ether compounds and polyester compounds. A blend is mentioned. Furthermore, esterified hydroxycarboxylic acid and the like can also be used. One or a plurality of the above plasticizers can be used as necessary.

  Furthermore, in the above-mentioned petroleum-based polymer and biomass polymer, as long as the effects of the present invention are not impaired, coloring agents such as pigments and dyes, odor absorbents such as activated carbon and zeolite, vanillin, dextrin and the like Perfumes, antioxidants, UV absorbers and other stabilizers, lubricants, mold release agents, water repellents, antibacterial agents, and other secondary additives.

  Moreover, if it is a range which does not impair the effect of this invention, in order to improve the compatibility in the composite interface of a sheath part and a core part, a compatibilizing agent can be added to said biomass polymer or petroleum-type polymer. As the compatibilizing agent, a substance compatible with both the biomass polymer and the petroleum polymer can be used, and examples thereof include a surfactant copolymer and a block copolymer. Furthermore, a crosslinking agent that reacts with both polymers can be used, and examples thereof include epoxy compounds having epoxy groups at both ends, oxazoline compounds, oxazine compounds and copolymers thereof, carbodiimide compounds and copolymers thereof, and the like.

  As a core-sheath ratio of the core-sheath-type composite fiber used for this invention, 20 / 80-80 / 20 are preferable by the mass ratio of a core / sheath. If the mass ratio of the core / sheath is less than 20/80, the ratio of the core biomass polymer is decreased, and the merit of using the biomass polymer such as a carbon dioxide reduction effect is decreased. On the other hand, if the core / sheath mass ratio exceeds 80/20, it is difficult to obtain the desired strength retention of the present invention, which is not preferable.

The form of the core-sheath type composite fiber used in the present invention is not particularly limited, and any of staple, shortcut fiber, and filament may be used, and the filament may be monofilament or multifilament. Further, it may be a raw yarn, a processed yarn that has been subjected to false twisting, knit denit, fluid jetting, or the like, or may be used as a twisted yarn obtained by using a double twister, a ring twisting machine, or the like. Further, the core-sheath type composite fiber and another fiber may be composited, and examples thereof include blended yarn and blended yarn.
Furthermore, the core-sheath type composite fiber used in the present invention preferably has a strength retention of 70% or more after 30 minutes in a 130 ° C. water bath. For apparel use, fashionability and palatability are sought, usually used after dyeing, and in the case of PET suitably used as a petroleum-based polymer for the sheath, dyeing is performed for 15 to 60 minutes in a water bath at 125 to 135 ° C. The polylactic acid suitably used as the biomass polymer for the core is dyed in a water bath at 100 to 110 ° C. for 15 to 60 minutes. Therefore, in the core-sheath type composite fiber, there is a concern that the strength decreases depending on the dyeing temperature. If the strength retention after 30 minutes in a 130 ° C. water bath is less than 70%, the strength decrease during dyeing is large and it is used as clothing. In such a case, the tear strength, tensile strength, and burst strength are insufficient and are not suitable for practical use. In addition, when the dyeing temperature is lowered in order to suppress the decrease in strength, the color developability required for clothing is lowered, which is not preferable.

  The apparel of the present invention is formed using the above-described core-sheath type composite fiber, and the strength retention after 500 hours in a 50 ° C. × 95% RH environment is 85% or more, particularly 90% or more. preferable.

  Here, the term “strength retention” refers to the strength (strength) at the time of cutting the fiber taken out from the fabric constituting the garment of the present invention according to JIS L-1013, and the following formula (1) The value calculated by

 When the strength retention is less than 85%, it is washed and dried, especially tumbler drying or sun-drying in fine weather, or wet in sweat or rain when used as clothing. When it is left in a high temperature environment such as outdoors, it gradually deteriorates and causes a decrease in strength, resulting in poor practical durability.

  In addition, the clothing of the present invention preferably has a dyeing fastness to friction of 4 or more. The dyeing fastness with respect to friction here is measured based on the provisions of JIS L-0849. In apparel use, it is required that the dyeing fastness to friction is preferably quaternary or higher. The biomass polymer used for the core portion generally has poor friction fastness when used alone as a fiber. For example, polylactic acid has a dry friction fastness of 2 when dyed in a dark color with an L * value of less than 50. -3 level, not suitable for practical use. In the garment of the present invention, by using the core-sheath type composite fiber, the dyeing fastness to friction can be made to be quaternary or higher. However, in the present invention, the quaternary or higher is preferable in both the dyeing fastness of the drying test and the wet test.

  The apparel of the present invention may be composed only of the above-described core-sheath type composite fiber, but regenerated cellulose fiber such as rayon, cupra, polynosic, solvent-spun cellulose fiber, or natural fiber such as cotton, hemp, silk, wool, etc. , Polyamides such as nylon 6 and nylon 66, aromatic polyesters such as PET, PBT, and PTT, and synthetic fibers such as polyacrylonitrile and polyurethane.

  However, in order to obtain an environment-friendly garment that can reduce the amount of carbon dioxide generated at the stage of production and disposal, it is preferable to use the above-described core-sheath type composite fiber of 50% by mass or more, particularly 70% by mass or more. .

  The clothing of the present invention includes not only final products such as outerwear, T-shirts, windbreakers, trousers and skirts, but also fabrics such as woven fabrics, knitted fabrics and nonwoven fabrics used for these clothing applications. Is done.

  Next, the present invention will be specifically described with reference to examples. In addition, each physical property in an Example was measured and evaluated by the following method.

(A) Strong retention rate (clothing)
As described above, the measurement was performed based on JIS L-1013.
(B) Dye fastness to friction Measured based on the provisions of JIS L-0849. Specifically, a cloth for clothing is set as a test piece (220 × 30 mm) on a friction tester type 2 (Gakushin type) on a test piece base. Then, a white cotton cloth for friction is attached to the tip of the friction element, and it is worn back and forth 100 times at a reciprocating speed of 30 times per minute between 100 mm specimens with a load of 2N, and the degree of coloring of the white cotton cloth for friction is compared with the gray scale. To determine the color fastness to friction. In addition, it measures about both a 7.1 dry test and a 7.2 wet test.

(Example 1)
As a biomass polymer, a polylactic acid having a relative viscosity of 1.850, a melting point of 168 ° C., an L-lactic acid unit of 98.8 mol%, and a D-lactic acid unit of 1.2 mol% was used. An aromatic polyester (copolymerized PET) obtained by copolymerizing 8 mol% of isophthalic acid having a melting point of 230 ° C. was used. Each chip was dried under reduced pressure, and then supplied to a concentric core-sheath type composite melt spinning apparatus to perform melt spinning. At this time, the polylactic acid is arranged as a core and the copolymerized PET as a sheath, the core / sheath composite ratio (mass ratio) is 50/50, melted at a spinning temperature of 260 ° C. and a spinning speed of 3050 m / min. Spinning was performed to obtain a core-sheath type composite fiber that is a highly oriented undrawn yarn of 140 dtex48f. Subsequently, the highly oriented unstretched yarn was stretched 1.49 times through a 90 ° C. heat roller, further heat treated with a 150 ° C. heat plate, wound up, and a core-sheath type which is a 95 dtex 48f stretched yarn A composite fiber was obtained.

  The obtained drawn yarn was used for warp and weft, and a 2/2 twill woven fabric was woven in a water jet loom at a warp density of 160 / 2.54 cm and a weft density of 100 / 2.54 cm.

  The resulting fabric was scoured and relaxed in a treatment solution (nonionic active agent concentration: 1 g / L, soda ash concentration: 5 g / L) under the condition of 80 ° C. × 20 minutes using a liquid dyeing machine, and a shrink surfer After drying at 130 ° C. with a mold dryer, it was preset at 150 ° C. for 1 minute. Furthermore, it dye | stained on 130 degreeC * 30 minute conditions by the following dyeing | staining prescription 1 using the liquid flow dyeing machine. Next, the dyed fabric is 80 ° C. × 20 minutes in an aqueous solution containing 5 g / L of soda ash, 1 g / L of hydrosulfite, and 1 g / L of a nonionic surfactant (Sunmol FL: manufactured by Nikka Chemical Co., Ltd.). Reduced and washed under conditions. Then, it was dried at 130 ° C. and finished and set at 140 ° C. for 1 minute to obtain a woven fabric composed of core-sheath type composite fibers. The resulting woven fabric had a warp density of 170 / 2.54 cm and a weft density of 106 / 2.54 cm. A windbreaker was produced using this fabric.

(Dyeing prescription 1)
Disperse dye 3% omf (Dianix Navy SG 200%: manufactured by Dystar Japan Co., Ltd.)
Dispersing leveling agent 0.5g / L (Nikka Sun Salt SN-130: manufactured by Nikka Chemical Co., Ltd.)
Acetic acid (concentration 48% by mass) 0.2cc / L

(Comparative Example 1)
Use 95dtex48f drawn yarn made of polylactic acid alone instead of core-sheath type composite fiber, set drying at 120 ° C, set preset at 130 ° C x 1 minute, and dyeing at 110 ° C x 30 minutes A windbreaker was obtained in the same manner as in Example 1 except that the reduction cleaning was performed at 65 ° C. for 20 minutes and the finishing set was performed at 130 ° C. for 1 minute.

(Comparative Example 2)
Using 95 dtex 48f drawn yarn made of PET alone instead of the core-sheath type composite fiber, drying at 150 ° C., presetting at 180 ° C. × 1 minute, and finishing set at 170 ° C. × 1 minute A windbreaker was obtained in the same manner as in Example 1 except that.

(Example 2)
Using the highly oriented undrawn yarn in Example 1 as a feed yarn, false twisting was performed in the Z direction under conditions of a speed of 100 m / min, a heater temperature of 120 ° C., a draw ratio of 1.38 times, and a false twist number of 2900 times, A core-sheath type composite false twisted yarn was obtained.

Using this false twisted yarn, a smooth knitted fabric (weighing 150 g / m ² ) was knitted with an LPJ-H double-sided circular knitting machine (28 gauge) manufactured by Fukuhara Seiki Co., Ltd.

Next, except that the dyeing prescription was changed to the following dye prescription 2, it was post-processed by the same means as in Example 1 to obtain a knitted fabric made of core-sheath type composite false twisted yarn. The basis weight of the obtained knitted fabric was 180 g / m ² . A T-shirt was produced using this knitted fabric.

(Dyeing prescription 2)
Disperse dye 4% omf (Dianix Black SR 200%: manufactured by Dystar Japan Co., Ltd.)
Dispersing leveling agent 0.5g / L (Nikka Sun Salt SN-130: manufactured by Nikka Chemical Co., Ltd.)
Acetic acid (concentration 48% by mass) 0.2cc / L

(Comparative Example 3)
Use a 100 dtex 48f false twisted yarn made of polylactic acid alone instead of the core-sheath type composite false twisted yarn, set the drying to 120 ° C., set the preset to 130 ° C. × 1 minute, and set the dyeing to 110 ° C. A T-shirt was obtained in the same manner as in Example 2 except that the time was set to × 30 minutes, the reduction cleaning was set to 65 ° C. × 20 minutes, and the finishing set was set to 130 ° C. × 1 minute.

(Comparative Example 4)
Use a 100 dtex 48f false twisted yarn made of PET alone instead of the core-sheath type composite false twisted yarn, set the drying to 150 ° C, set the preset to 180 ° C for 1 minute, and set the finishing set to 170 A T-shirt was obtained in the same manner as in Example 2 except that the temperature was set to 1 ° C. for 1 minute.

  The windbreakers and T-shirts according to the above-described Examples and Comparative Examples were measured for their strength retention and dyeing fastness to friction, and the results are shown in Tables 1 and 2, respectively. In the table, “dry” means the result of the dry test, and “wet” means the result of the wet test.

  As is apparent from Table 1, the windbreaker of Example 1 and the T-shirt of Example 2 use core-sheath composite fibers in which polylactic acid is disposed in the core and copolymerized PET is disposed in the sheath. % Strength retention and dyeing fastness to grade 4 or higher friction and excellent practicality.

  On the other hand, since the windbreaker of Comparative Example 1 and the T-shirt of Comparative Example 3 use fibers made of polylactic acid alone, the strength retention was less than 85% and the heat and moisture resistance was poor. Furthermore, the dyeing fastness with respect to the friction in a dry state was also as low as 1st grade or 1-2 grade.

  Moreover, since the windbreaker of Comparative Example 2 and the T-shirt of Comparative Example 4 use fibers made of PET alone, they have a strength retention of 85% or more and a dyeing fastness to friction of Grade 4 or more. It was. However, since no biomass polymer is used, the present invention does not have the effect of reducing the amount of carbon dioxide generated at the stage of production and disposal.

From the above results, in the apparel of the present invention, the core portion is composed of biomass polymer and the sheath portion is composed of a petroleum sheath polymer, so that the sheath portion is composed only of conventional petroleum synthetic fibers. The amount of carbon dioxide generated at the stage of production and disposal can be reduced from clothing, and the moisture and heat resistance, dyeing fastness, etc. are improved and the practicality is superior to clothing using fibers made of biomass polymer alone. I was able to confirm.

Claims (5)

  It consists of a core-sheath type composite fiber in which the core part is composed of biomass polymer and the sheath part is composed of petroleum-based polymer, and has a strength retention of 85% or more after 500 hours in a 50 ° C. × 95% RH environment. And clothing. 2. The clothing according to claim 1, wherein the dyeing fastness to friction is 4 or more.   The garment according to claim 1 or 2, wherein the petroleum polymer in the sheath is polyethylene terephthalate.   The petroleum-based polymer in the sheath is a copolymerized polyethylene terephthalate having an ethylene terephthalate unit as a main component and 5 to 20 mol% of at least one component selected from isophthalic acid, cyclohexanedimethanol and cyclohexanedicarboxylic acid. The clothing according to claim 1 or 2. The garment according to any one of claims 1 to 4, wherein the biomass polymer in the core is polylactic acid.