TWI278542B - Polytrimethylene terephthalate conjugate fiber and method of preparing the same - Google Patents

Abstract

Disclosed is a polytrimethylene terephthalate conjugate fiber having high self-crimpability, which is prepared by conjugate-spinning two types of polytrimethylene terephthalates having different intrinsic viscosities in which a difference between the intrinsic viscosities ranges from 0.05 to 0.15 into a side-by-side fiber. Also, the polytrimethylene terephthalate conjugate fiber prepared by the conjugate-spinning undergoes a false twisting process, leading to development of three-dimensional high self-crimpability and sufficient bulky property in the resulting fiber.

Description

1278542 玖, invention description: [Technical field to which the invention pertains] This I month (generalized &) is a polyester-based conjugate fiber and a method for preparing the same, and the present invention is as follows: The present invention relates to a polyester conjugate, a cut, a bismuth and a method for preparing such a fiber, which comprises conjugated two types of small steroids having different characteristics, and is formed into a kind. a fiber having juxtaposed cross-sections, followed by heat treatment and loosening to produce the fibers

Self-invulnerability and total quality. In particular, the present invention relates to a preparation? K 酉 类 共 共 共 共 共 共 共 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆 盆Good spinning operability. [Prior Art] Several methods for producing a gas-supplemented sub-conjugated conjugate fiber are known in the art. A representative example is the conjugate spinning of a polyester 盥苴 〃 / copolymer having a south shrinkability to produce a side-by-side fiber 、, - ☆, and I In another example, the fibers are juxtaposed by two kinds of papers. However, the disadvantages of these, 'v, and production methods are that the copolymer has a degraded physical property and a poor spinnability. The above two methods are wrinkled. The flat I stock flat yarn produced by the conventional method is subjected to the shrinkage ratio (the fabric manufactured by the method provided by the present invention. However, "&quot; two" can provide elasticity, and has many It is especially difficult to obtain the octagonality of the cross-latitude and longitude cross-linking. It is especially difficult to obtain the octagonality on the altar. The v-man full-featured bullet 127842 Another light-weight difference made by utilizing the intrinsic viscosity difference between the two polymers An example of a spinning method is disclosed in Japanese Patent Laid-Open Publication No. 2000-25691 No. 2000-- discloses a wrinkable polyester conjugate fiber which has a propylene terephthalate containing a repeating unit in an amount of more than 85% and has a polyester having three or more ester-forming functional groups of unpolymerized composition, A, and propylene terephthalate containing a repeating unit in an amount of more than 85 mol% and an amount of 0.5-0.2 mol% having three or a plurality of poly-b, which forms a composition of a functional group, or an un-copolymerized with propylene glycol phthalate containing a repeating unit in an amount of more than 85 m〇1% and having three or more ester-forming functional groups The composition of the side, C' (, its characteristic stickiness Co-spinning: A side-by-side or eccentric sheath-core fiber. To make the conjugate fibers have shrinkable properties, the two polyesters are composed. The difference in intrinsic viscosity must be greater than 〇.15. And 'because it is not easy to produce shrinkage in the form of flat yarn, & the fiber in the form of flat noisy must be purely treated and reinforced into a false twist yarn. Shrinkage. Due to the difference in intrinsic viscosity, the lower portion of the filament nozzle is severely bent, which makes the spinning operation very poor. The difference in the intrinsic viscosity between the two components of the parallel fiber is small ==: Good spinning operation can be obtained, but it is difficult to make: shrinkage. 缄 缄 产生 产生 产生 [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ The ester yoke yoke loses its dimension, and it does not have the aforementioned shortcomings. /, The inventor of the present case is dedicated to the singularity of the research, trying to achieve 1,279,542 production of <2, and thus found that the conjugate fiber can be Different properties of each other are 0.05-0.15 different polytrimethylene terephthalate _ class carries out: 4 曰 糸, 糸 — 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有Shrinkage, &amp; externally, when the conjugated fibers prepared by conjugated spinning of different polymers have a small characteristic viscous: The difference in the intrinsic viscosity of the polymer causes the shrinkage of the poly-materials to be inconspicuous, and the false twist at high temperatures produces a latent twist, which makes the conjugate fibers highly retractable and has sufficient build-up properties. [Common Application Mode] [Best Mode for Carrying Out the Invention] According to the present invention, there is provided a method for preparing a polytrimethylene terephthalate yoke, which comprises two kinds of polyparaphenylene having different intrinsic viscosities. The co-fibrillation of the formic acid propylene is a kind of parallel fiber, and the characteristic viscosity difference range is from 〇· 〇5 to 〇.丨5, which makes the fusion between the two bismuth compounds. The difference in viscosity reaches a range of less than 1000 poises /, Zhonghai - The para-phenylene benzoate contains propylene glycol propylene glycol (PPT_H) with high intrinsic viscosity ([. is 0.9 to 1.1 ' and contains poly-terephthalic acid propylene glycol with low intrinsic viscosity). (PTT-L), the intrinsic viscosity (shirt) is 0.8 to U, and the PTT_H and 曰TT L satisfy the K value (^(4) genus, which is calculated according to the following equation: 1278542 Further, the present invention provides a winter匕3 two kinds of polytrimethylene terephthalate vinegars with different intrinsic viscosities (the range of intrinsic viscosity differences between them are 0.05 to 0.15) and have a parallel structure of polytrimethylene terephthalate S 曰Fiber, wherein the two kinds of poly- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Η) is ο·9 to ι·ι, and white gauze & * and contains a characteristic viscosity of polytrimethylene terephthalate (ΡΤΤ-L) with low intrinsic viscosity, Degree ([Wl) is 0.8 to 1.0, the PTT-H and ptt_l satisfy n rabbit, and the value of χ is 0; Κ^0·06 It is calculated according to the following equation: &gt; Κ = {[η]Η- [η]]/{[η]Η+ h]L} The two types of conjugated spinning roots are juxtaposed according to the present The poly-p-propyl propylene glycol esters of the fibers have a characteristic viscosity difference range between 0 and 0 5 to 〇·1 5 , and 〇^, station degree. ^Intrinsic viscosity difference is adjusted ^ · The narrow range of soil 〇15, and 咕兮一ώ: ^ « 吏5hai a polymer between the melt viscosity to different than 1 〇〇〇 纺 纺 纺 纺 得 亍: 槿 smelting and spinning operability without additional nozzle design, in addition:; the side-by-side fiber 'and has a good % ^ ^ ^ ', can only be straw Different polymer combinations, 6 fibers that are expected to be obtained and have a good shrinkability at the extruder temperature. Hereinafter, it has a high intrinsic viscosity, and the PTT fi"di-I is a so-called bismuth propylene glycol S, which is called PTT i , and the water is propylene glycol diacetate. It is used to prepare the present invention. (It contains PMT_^PTT-L which is depleted m X month 4&quot; conjugated fiber 1278542 for the present dicaprate propylene glycol ester each having the same diterpene ester|one propanone ester as the main component), preferably containing unpolymerized The trifunctional vinegar is formed, and in the composition, the amount of bis(3-propyl)trans (DPG) and cyclic dimer produced as a by-product during the polymerization can be less than 3.0. 1%/dihydric alcohol and less than 3 ^. In general, when the intrinsic viscosity difference between ρττ_ΗPTT-L is less than 〇15, it is known that the two polymers are also small due to the small melt viscosity between the two polymers. The amount of shrinkage between the two is small, so that the fiber which is desired to have a satisfactory shrinkage ratio is not produced. According to the present invention, when the difference in the melt viscosity between the two polymers and the combination ratio thereof are adjusted, _ Preparation of polyterephthalic acid having the desired shrinkage ratio: diol Even if a polymer having the same viscosity difference as described above is used, when the melt viscosity of the two polymers is Poise (and more preferably lower than 3. Poise), even a difference of less than a small point can be used (M5 The polymer is made to have a satisfactory shrinkage rate over the fiber, the method of measuring the enemy shrinkage rate will be listed below, and the I shrinkage rate should exceed 30 / 〇 to make a fabric with sufficient elasticity. The second polymer can be extruded at different temperatures to produce a different color in the melting of the polymer, and the product is different in the product. Having a combination ratio of::::2 with a low viscosity polymer and adjusting the difference in the melt viscosity to be lower than..., the spinning is in the range of 235 to 275t. Further, according to the present invention, ·Η and PTT-L have different intrinsic properties of 〇, and the ratio between the two polymers is preferably 0.05 to (Μ5. When the polymer is widely produced... Viscosity is less than 〇·7 or higher than 10 operability Poor. In particular, according to the equation, shown in the equation, K, the value is better. . Between &lt; ..6 similar range of [Formula 1] ^ Κ = {[η ^ - [η] ί} / {[η] Η + [η] ί)

'The heart is the characteristic viscosity of ΡΤΤ_Η, and [吣 is the F viscosity of PTT-L. Characteristics of UL 1 1 L Only 2 good grounds ' PTT_L has an intrinsic viscosity. Μ·... is made of fiber and 30·7()%’ in the ^ and PTT_H has an intrinsic viscosity of 0.85] and accounts for 7〇_3〇% of the total weight of the fiber obtained. .1 A side-by-side fiber having a shrinkage ratio of 3 G% can be obtained by using the dipolymer at a difference of less than 1 Å. Such fibers; 2 are suitable for the preparation of elastic fabrics' but are not suitable for the preparation of highly elastic fabrics which are made of elastic fibers and which require high shrinkage. According to the present invention, a flat yarn of the type (four) is prepared and then subjected to a false twisting process to produce a raw yarn which can be used for preparing a highly elastic fabric. The spinning speed suitable for use in the present invention is preferably set at, but not limited to, 1,500 to 4,000 m/min. In addition, 'a high-elastic twin-fiber with stereo-shrinking is obtained by false-twisting the flat yarn prepared for the second garment at the spinning speed'. Temperature _ is an important factor. The false twist ratio is preferably from 1 to 15' and the false twist temperature is preferably from 100 to 180 °C. When the stretching ratio is U·1.5, the stretching method is carried out, accompanied by the use of the first feeding drum (the -FR), the heater, the cooling plate, the friction 1278542 device and the second feeding roller (second FR) (where the order of each component is arranged according to the frying line processing step), the preferred stretching method is between the first FR and the third FR, The extension ratio is completed under 0-1·0-1.5. In such cases, the yarn is falsely twisted in the upstream region of the friction crucible device and thermally fixed by a heater, and the cooling plate is used to fix the yarn shape. The false twist-stretch ratio is preferably from ι to 1.50, and more preferably from (5) to ^^ when the false twist ratio is less than 1.0, it is difficult to maintain proper false twist tension and thus the processing workability is poor. And can not get high shrinkability. When the false twist-stretch ratio exceeds 1.5 and fine hair and yarn fragments increase, poor workability is caused. The friction stir plate that can be used in the present invention includes an internal or external friction (4) device capable of acting on the feed and feeding, and is preferably an outer shaft vertical type machine and a belt type crucible. machine. The stretching ratio is determined by the polybutanic acid; the propylene glycol ester undrawn yarn or the physical properties of the false twisted yarn, wherein the residual elongation is preferably 3〇_65%, and more preferably 35_5〇 %.疋In order to increase the shrinkability of the false twisted yarn and thus improve the pullability and stacking properties of the fabric, the false twisting temperature of the purely crying yarn in the false twisting and drawing process is compared to war. When false: Yu Gang. C when 'fabric quality deteriorates as follows: false twist tension increase = this leads to an increase in the production of yarn fragments and improper inspection during the false twist process, steric stability or shrinkage reduction, and Shrinkage is caused by the processing of the yarn after the processing of the yarn: the color of the garment is changed. When the false grip temperature is high, the yarn still maintains a very sturdy shape, so the quality is deteriorated, πσ; the fusion of the king and the V-line 12 1278542 can not be obtained, and it is impossible to obtain the general knowledge. The pleats are pleated and the workability is deteriorated. The flat yarn prepared by the above false twisting method has a potential twist, and the potential twist is produced by the processing of the post-processing pine 敎 Μ Μ ,, 2, thereby being manufactured Good knockability, build-up performance and abundance of the final total fiber. According to the invention, a polytrimethylene terephthalate conjugate is provided

Fiber, which consists of two types and right; ^ Ρ1 gentleman L 3 Π7颔/, polytrimethylene terephthalate I with different intrinsic viscosities, the characteristic viscosity difference between them is between 〇〇5 To 〇·15. The resulting conjugate fibers have a side-by-side structure with an elongation of 2 〇 _3 5 g/den' elongation of 3 〇 _ 65%, a sensitivity reduction ratio of more than 2 〇 %, and an elongation of 30 Å. /. The elastic recovery rate is higher than 9〇%. When the strength is less than 2 〇, the yarn shards are often generated due to the low strength, and the workability in manufacturing the fabric is not good. When the strength is higher than 3 5 g/den, the texture of the fabric is poor. Also, when the elongation is less than 30%, many fine hairs are generated on the resulting yarn during spinning. When the elongation is higher than 65%, the uniformity (U%) of the fiber scale deteriorates. When the shrinkage ratio is less than 30%, it is difficult to obtain the desired elasticity. When the elastic recovery rate at an elongation of 30% is less than 9〇%, the elastic restoring force is poor and the clothes are not worn, and the yarn is intended to maintain its originality due to repeated deformation and frictional damage to the yarn. The ability to state is reduced, resulting in the loss of the original shape of the garment. The invention will be further described in detail with reference to the following embodiments and the accompanying drawings. However, the following examples are merely intended to illustrate the invention, and the invention is not limited to the examples. Example 1 Using a extruder equipped with a spinning split as shown in Fig. 2, a total amount of 1278542 50% by weight, having a characteristic viscosity _ m ^ iV of 10, of polyparaxamic acid

Propylene glycol ester (used as ΡΤΤ-Η)盥i 士Ψ S &quot; "There is IV is 〇·9, used as p L of poly-p-propylene glycol dicarboxylate in ^, u, square wire catching degree of 2000 m / min And the temperature of the dressing machine is 260 and 9^ respectively. Under the slash 265 C, the yarn is spun using a parallel penguin nozzle, and then stretched 1 汸〇r ^ . , , the elongation ratio is L5, the stretching temperature The film was stretched for 55 C ', and the degree of 4 22 GtT. The cold air set to 23 C was supplied to the lower side of the nozzle at a rate of 0.3 m/sec for $•(10) metric, and the oil absorption rate (0PU) was determined as % by weight. The obtained fiber is used as the warp and weft, the weaving weight is the cloth and then dyed under the sacrificial. The intrinsic viscosity difference between the two polymers (PT...PT; L) is G1, and κ, the value 〇〇53. Embodiments 2 to 4 The method of &lt;described&quot; is used to prepare a woven fabric and dyed, but there is a polybutylene terephthalate of 1 Å... and PT is a PTT-L having an IV 〇 9 One machine - 庐 micro "V to one - formazan propylene glycol squeezing - 'in the ' and then 'more as shown in Table 1 below. Only examples 5 to 1 have the intrinsic viscosity and various combinations of PTT-L shown in Table 2 below, and are spun at a speed of 2000 m for 7 minutes and at a spinning reel temperature using a parallel type spinning nozzle. And in the case of stretching, the example is ^ 1 r , and the stretching is carried out at a temperature of 2 ° C and a heat treatment temperature of 2 ° C. ^ Examples 11 to 6 A spinning machine equipped with an extruder, having 50% by weight of 14 1278542 having an intrinsic viscosity of 1 (), as a ρττ_Η poly-p-propyl benzoate 'With 50% by weight of IV with 〇9, as a poly-p-benzene: formic acid: alcohol _ at a spinning speed of 3, then m/min, at a spinning reel temperature of 4 265 ° C, used A flat yarn is prepared by spinning a side-by-side spinning nozzle. The speed of w 〇·3 m/s will be set to say that cold air is supplied to the position 5-10 cm below the nozzle, and the measured absorption is 2; (OPU) is 0.4 to 0.8% by weight. The resulting yarn was accompanied by various false twist temperatures and various stretching ratios as listed in Table 3 below, and false twisting was performed using a false twisting machine (Murata 33H) to obtain a false ^搓 fiber. Using these fibers as warp and weft, a woven fabric having a weight of 200 g/m 2 was produced and then dyed at 1 〇 5 . The intrinsic viscosity difference between the two polymers was 0.1, and K was 〇.053. The physical properties of the polymers and fibers were evaluated in the following manner. Intrinsic viscosity (IV): After fully dissolving each polymer in 12 (rc i % o-chlorophenol solution), the intrinsic viscosity was measured using a Ubbel〇hde viscometer in a 30 ° C water bath. Shrinkage rate (TC) ' : At a tension of 50 mg/de, obtain a bundle of yarn samples with 3000 de. The sample was heat treated in 10 (rc hot water for 20 minutes, and its load was 〇·5 mg/de without yarn Tangle, thereby causing shrinkage. After the load is removed, the sample is cooled for 4 hours and air dried. After the weight of 2 mg/de is applied to the air-dried sample, the length L纱线 of the yarn is measured. After the L丨, the load of 2 nig/de + 200 mg/de was applied to the sample, and after 1 minute, the length L2 of the yarn was measured. According to the following Equation 2, the measured L! and L2 values were used. Calculate the shrinkage rate (TC) 】 5 1278542

[Equation 2J

' / V x~z - 1 y — 2 / Λ 1 UU system / kg fiber elastic elongation rate of 30% elongation. , %): :: Three pieces of fabric with 5·5 cm x 30 cm (five) weft. Place the knife in the tensile tester and apply the initial load _ the test piece. According to the low speed elongation measurement method 'v L 1018-70 ), the paper is stretched at a speed of 100%/min. To elongation Dana. Its

After the test piece is returned in the opposite direction at the same speed. When the stress reaches the initial load stress, the elongation and elongation are estimated in the stress/elongation curve, and the average elongation in the direction of each warp and weft is calculated, and then FR3Q is calculated according to Equation 3 below. [Equation 3] FR30 (〇/〇) = {(30- ε)/30} χΐ〇〇 Table 1 Example Spinning reel temperature (.〇) K value ΡΤΤ-Η PTT-L 1 260 265 265 _ 〇 2 255 265 265 ^ 〇3 250 265 265 〇053 4 广 265 260 265 \J · \J 0.053 Table 2 Example PTT-H PTT-L IV difference K value IV ratio (wt0/〇) IV ratio (Wt0/o 5 1.0 50 —-~~~— 0.90 50 0.10 0.053 6 1.0 50 —-——-__ 0.85 50 0.15 0.008 7 1.0 55 ------ 0.90 45 0.10 0.053 8 1.0 60 0.90 40 0.10 0 053 9 1.0 —^z〇0.90 30 0.10 0.053 10 1.0 40 0.90 60 0.10 0.053 16 1278542 Table 3 Example Spinning Reel Temperature (°C) K Value False 拉伸 Stretch Ratio Stretching Temperature (°c) 11 265 0.053 1.1 120 12 265 0.053 1.1 140 13 265 0.053 1.1 160 14 265 0.053 1.05 160 15 265 0.053 1.10 160 16 265 0.053 1.20 160 The physical properties and shrinkage ratio (TC) of the conjugated fibers prepared in the above examples are summarized. In Table 4 below. 17 1278542

[Industrial Applicability] From the data of the above-mentioned examples, it is obvious that there is a low keke reserve month, and S combines the difference of the two other viscous viscosities in the fusion viscous # s The propylene glycol esters have a π degree difference of less than 1000 poises. In addition, by the amount of self-wrinkle, the heart can be faked to promote the performance of the potential to reverse the twist, * 4 days / acupoints can be sensitive and piled, sub-edge supply Good spinning _ stretching operability $ take 舻 um 4, * - I born IS conjugate fiber. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, advantages and other advantages of the present invention will become more apparent from the detailed description of the following formula 0, wherein FIG. 1 exemplifies a 77 according to the present invention. An example of a cross section of a propylene glycol conjugated fiber of 8 1278542; and FIG. 2 is a schematic view of a spinning machine equipped with an extruder for producing an embodiment of the present invention. fiber. 19

Claims (1)

1278542 Picking up, patent application scope: 1 · A method for preparing polytrimethylene terephthalate conjugate fiber, comprising conjugate spinning two kinds of polytrimethylene terephthalate having different intrinsic viscosities into a juxtaposition a fiber, wherein the characteristic viscosity difference is in the range of 0.05 to 0.1 5, so as to achieve a difference in melt viscosity between the two polymers in a range of less than 丨000 poise, wherein the two kinds of poly The propylene terephthalate type comprises a polyethylene terephthalic acid propylene glycol vinegar (ΡΡΤ·Η) having a high intrinsic viscosity, and has an intrinsic viscosity (10)η) of 0.9 to 1_1, and comprises a polytrimethylene terephthalate having a low intrinsic viscosity. The characteristic viscosity (called) of (PTT-L) is u to U, and the ΡΤΤ_Η盘ρττ L satisfies, K, the value is 0 Κ^)·06, which is calculated according to the following equation: κ={[η]Η ~[η]]/{[η]Η+[η]". π, knives, co-drying The two types of poly(polypropylene terephthalate) include poly-p-dimethyl propylene glycol with high intrinsic viscosity, and poly-p-butyl phthalate with low intrinsic viscosity Ester (PTT-L), the ΡΤΤ-Η ΡΤ TR TR 丄 PTT~L has different intrinsic viscosities ranging from 0.7 to 1.1. 3. According to the method of claim 1, wherein the two kinds of poly The propylene terephthalate esters contain propylene terephthalate (PPT-H) having a 4 inch viscosity and a propylene terephthalate having a low viscosity of 4 inches. (PTT-L), the PTT-H invites X&gt; D'L satisfies 'K, and the value is 〇n〇6, which is calculated according to the following equation. κ= {[η]Η- where [η]Η is Ρττ# [η]^/{[η]Η+ [η]^ characteristic viscosity, and [r|]L is the characteristic viscosity of PTT-L 20 1278542. 4. According to the method of the third paragraph of the patent scope, The two kinds of polytrimethylene terephthalate vinegars include polytrimethylene terephthalate (PPT-H) with high intrinsic viscosity and polyparaphenylene with low intrinsic viscosity. Acid propylene glycol vinegar (PTT-L), and the content of Yanhai PTT-H is 3〇_7〇% of the total weight of the total fiber, and the content of far PTT_L is _3〇% of the total weight of the total fiber. " 5. According to the method of claim 1 of the patent application, wherein the two types of poly(p-para-benzoic acid) have a high intrinsic viscosity of polytrimethylene terephthalate (PPT-H) and have The low intrinsic viscosity of polytrimethylene terephthalate 叩 TT-L), and the spinning temperature of the PTT_H and pTT_L is as high as 275 ° C. 6 · According to the application for patent paradigm jfi Chu, the work ^ W brother 1 method, which is the combination of the poly-p-formic acid: alcohol s purpose! ^ Spinning becomes a kind of juxtaposed fiber, and the obtained fiber is subjected to false twisting using a rubbing device, and (4) is stretched. 0 7. According to the method of claim 6 of the patent application, it will be Μ. . · 4, the parallel fiber prepared at the spinning speed of glutinous rice / minute uses a false grip device, the ratio of false twist-stretch 1 is 1.0-1 · 5, and the false twist temperature is 1 〇 (M80 ° C and stretching H 捻搓 processing this 痄 认 η η , , , , , , , , , , , , , , , 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. The propylene-co-ester conjugate fiber comprises two kinds of bismuth and different intrinsic viscosities of poly-p- 1 _ two-fold propylene glycol acrylate, wherein the characteristic viscosity difference ranges from 〇〇5 to 〇. And having a side-by-side structure, wherein the two poly-p-benzoic acid propyl-/, inner-S-esters comprise a high intrinsic viscosity of 21 1278542 poly(p-phenylene terephthalate) (ΡΡΤ-H) Viscosity ([η]Η)Α JJ, and contains a poly-W with low intrinsic viscosity as the intrinsic viscosity of PY-L ([〇〇·δ·h到,〇ρττ,Η^ The value of 'Κ' is 0 &lt; Κ 〇 , 6, which is calculated according to the following equation {[η]Η - [η]]/{[η]Η+ [η]ί}. 8 pairs of pairs a phthalic acid conjugated fiber in which the conjugate fiber has high shrinkability, an elongation of /3·5 g/den 'elongation of 30-65°/., and a shrinkage ratio of more than 20%.聚·Polythrylene terephthalate fiber according to item 8 of the patent application scope, wherein the total fiber has high shrinkability, and has an elastic recovery rate of more than 90% at an elongation. Schematic: For example, the next page °*9 ^ diol test pTT^L diol 6%% 2.0- diol ester 30% of 22 1278542 柒, designated representative figure: (1) The representative figure of the case is: (1) (2) A brief description of the symbol of the symbol of the representative figure: (none) 捌 If there is a chemical formula in this case, please disclose the chemical formula (none) that best shows the characteristics of the invention.