TW454052B - Process for the manufacture of spandex and the spandex made thereby - Google Patents

Abstract

A process for preparing spandex comprising the steps of: (A) preparing a polymer solution of an elastomeric segmented polyurethane, based on 1,1'-methylenebis(4-isocyanatobenzene), a polyether glycol selected from the group consisting of poly(tetramethyleneether) glycol and poly(tetramethyleneether-co-3-methyletetra-methyleneether) glycol, and a diol selected from the group consisting of ethylene glycol, 1,3-propane diol, and 1,4-butane diol; (B) adding to the solution prepared in step (A) 1-10% by weight of total polymer solids content a polymer selected from the group consisting of poly(N-vinyl-2-pyrrolidone) and PVP copolymers; (C) dry-spinning the solution prepared in step (B) to form spandex; and (D) winding up the spandex.

Description

454 052 5. Description of the Invention (1) Background of the Invention The present invention relates to a method for manufacturing dry-spun elastic fibers, and more specifically, relates to the use of poly (N-vinyl_2_pyrrolidone) and elasticity. Bulk block polyurethane in a dry spinning process. Description of the background technology "Due to its excellent stretch characteristics, elastic fibers have been widely used in clothing such as socks, underwear and sportswear." Reliable fiber spinning is an economic advantage in fiber manufacturing because the waste is reduced. Published patent application 48_80 1 50 discloses the use of 2-pyrrolidone) in the manufacture of wet-spun polyurethane- and polyurethane urea-based elastic fibers to improve whiteness retention. A base T acid · ester that has excellent dry spinnability and can be spun into elastic fibers. SUMMARY OF THE INVENTION The method for preparing elastic fibers according to the present invention includes the following steps: Preparation of a polymer solution consisting of: 1, -Methylene: 5 (4-iso-1 acid benzene) -based elastomer is embedded in a group consisting of poly (tetramethylene ether) ethylene glycol and poly (tetramethylene ether) Selected polyethylene glycol :: X 'monool' 1,3-propanol and 1 4 -but-t glycol;, selected from the group consisting of alcohols. B. In the solution prepared in step A Add A ± human 1 1 Λ Θ ft / ^ A, the total polymer solids will be 10% by weight of self-polymerized (N-ethylene Base #A, Zhiqiutu 2 drolrolidone) and PVP copolymer C: \ ProgramFiles \ Patent \ 555l7.ptd ^ 4 54 §§ 2 5. Description of the invention (2) Polymer; and C * dry out the solution prepared in step β to make γ mountain β • take up the elastic fiber and dry it, “A brief description of the drawing of the rabbit fiber and the winding device (schematic figure 1 shows-typical Rotate the display into the 4 (guide wire) roller. The detailed description of the invention is as used here. The elastic fiber has 1 made fiber. J: 中 迠 _ 扎 ”逋 hanging tolerance, that is, a kind of 匍 其 田 秘 # 、 肀 成Fibrous material: A fiber that is adhered by at least 85 heavy-duty nozzles-a large number of nj f # fibers composed of ^ elastic fibers that have passed through agglutination lines (or fiber-forming polymer formic acid used in the method of the invention) can be manufactured With marginal quality; = A t. Polyamino f: Spin spinning in the method, especially when multi-filaments are combined to make U: 2 in force fibers. For example *, elastic yarn along the yarn "sentence i" P: if Sensitive measure of elasticity may be g ^, + kinds of spinnable. Amazingly comfortable and cannot be used for clothing purposes such as knitted socks Yukiji Discovered the elasticity of polyurethane base _ The dry spinnability of Uygur and the uniformity of the yarn along the thread are improved. The effect is improved by the elastic fibers of polyurethane. Not found. The polyaminoacetic acid polymer of the present invention is prepared from polymerized ethylene glycol, diacid and low molecular weight glycol chain extender, and the polymer can be polymerized.

I 1

I C: \ ProgramFiles \ Patent \ 55517.ptd Page 5 5. Description of the Invention (3) Glycol, polyester glycol, polycarbonate diol, and the like are used as the substrate. Polyether glycol is preferred. More preferred are poly (tetramethylene ether) ethylene glycol (hereinafter referred to as P04G) and modified P04G, which is a copolymer of tetrahydrofuran and 3-methyltetrahydro & an (poly (tetramethylene ether-co- _3_methyltetramethylene ether) ethylene hereinafter referred to as 3MeP04G. When P04G is used in the method of the present invention ", the pot generally has a number average molecular weight in the range of about 100-300. TaiMei 3MeP04G generally has a number average molecular weight of at least about 15,000 but ^ 800, preferably at least about 250,000 but not more than about 6,000, and more preferably about 3 Mo .: 4_. 3MeP04G The content of the 3-methyltetramethylene group is about η. The diisocyanate used in the month may be an aromatic diisocyanate, such as 1 1, ΐ :: diisocyanatobenzene (hereinafter referred to as abbreviation) M D1). M D1 is used with diisocyanate ear ratio (" blocking ratio ") of about h5-4. °; 3.K. . The low molecular weight diol chain extender is ethylene glycol biyobutanediol (referred to as " 2.G ", " 3G " and " criminal) and & he & It can be achieved by adjusting the composition of the polymerized ethylene dicyanate and chain extender, and the molecular weight of the monoisodiol is high, so that two miles ... t. For example, if polymer B is high. Similarly, if the chain extender and: two: t mesh to Xia (i.e., 'end-capping ratio) should be low. θ extends the molecular weight, and the relative of the chain extender is used to prepare the polyurethane used in the method of the invention. ^ The formic acid is prepared in the melt and redissolved 4 5 4 Ο δ: ί. V. Description of the invention (4) In a solvent to obtain a polyurethane solution, bulk polymerization and dissolving method. In the first & $ 4 ° this is the "melt synthesis directly in the solvent. When it is formed, 'polyaminoacetic acid in the solvent to form a solution, and then dry spinning. This is H 曱 ㈣ Dissolution method. Each general method has a variety of different methods ^. Luoye polymerization " methods, for example, polyaminoacetic acid brewing can use polyether ethylene di_ to form diisocyanate-terminated ethylene glycol, lack of ^: iso Titrate first: react with for bond extension (" Second variant method, the appropriate polyethylene glycol method). In and appropriate glycol chain extender can be used in The presence of solvents; several purposes are to synthesize polyamino esters (" one step dazzling body " 5 = '' different types of polyols, diisocyanate, and polyol mixtures using molecular weight polyols, etc. The magic field is used differently, although it is better to use substances with greatly different reaction rates: do not react, and then mix the reaction products together. Sha 4 ^ The melting system used to make the fiber of the present invention is available: Known technology Soluble in solvents, typically: ^^ wave 'shear speed and similar methods Combining and dissolving. If necessary, it can also dissolve auxiliary agents. Use powdered or small pieces of polyurethane to make polyurethane dissolution. J Promote the same, when preparing polyurethane directly in solution In this case, polyetherethylene glycol and diisocyanate can be mixed and reacted to form an isocyanate-terminated prepolymer. The method used for this reaction is not particularly limited. These methods include ordinary mixing, applying ultrasound to the solution while stirring, and / Or use homogenized mixed mothers

454 05 2. V. Description of the invention (5) Device 'Static Mixing, 雔 &' Cyanate I Terminal ("End-kneading Kneader or the like. Then the solvent of different polyols will be used in the process. If the When the end-capped solvent is the same, it will be a dry, square polyurethane solution. This is the method of adding diol to form a polyurethane chain. n. Ethyl glycol and diol are directly dissolved in the solvent in the solvent. For example, the polymerization is polymerized. This means that,-,,, and then a cyanate ester is added for preparation in the present invention. Method ". When using one, two or two or more alcohol-extended polyurethanes, it is helpful to mix catalysts * methylamine, triethylamine, N_methyl Porphyrin ?: Di-N, N-tetramethylethylenediamine, N-ethylmorpholine, N, N, N, N, N ', N, -tetramethylhexamethylenediamine,', -tetramethyl -i, 3-propanediamine, N, N, N ,, [f, N, -pentamethyldiethylene di-amidinoamino ether, Ν, r-dimethylpyridine, N-fluorenyl ;: Group :, triethylenediamine 1 (2-dimethylaminoethylmorphine), p-diylaminomethyl, wow L dimethylamino-ethanol, n, n, n, :: diamine, N-methyl-N , -2- (Lion, its ethoxyethyl ethyl group, u-dimethyl; =) hexane = ^ A. ® gg, S alcohol monoethanolamine, and the like. Dibutyltin dilaurate, caprylic acid The solvent of dibutyl formic acid is not particularly limited. However, the dissolving composition should include at least one kind of dimethylacetamide (I, Neuc "), dimethyl C: \ Program Files \ Patent \ 55517. ptd Article 454 OB 2. V. Description of the invention (6) = Ammonium amine and dimethylimine (,, _ 1;? Polyurethane s is intended to polymerize in a solvent: ::: C. 疋 is better No matter which method is used ^ its general solid makeup: ulcer * 丄 eight milk total 1r acid ester solution, the hardness of the shape is in the range of about 30 to 40% by weight. After the solution is formed, specific eye additives can be added to the solution as appropriate, and various light absorbers to be used dry, other stabilizers that are resistant to benzodiazol, UV mineral oil, and lithone oil, Antistatic: J Diqiang anti-adhesive Turbidity agent such as static electricity and the like. Pot of additives he will 丨 〇 hindered phenol stabilizers such as 2, 6-bis-third Ding Fu _4_ as light stabilizers: Jipan, antioxidants such as " Sumilizer " GA-80 (manufactured by Sumitomo Chemical Industries, Ltd.), benzo: razole sentence cutting " T .. ^ ^ vegetable strain σ is not inferior-sits including various TinuvirT stabilizers (Ciba special ^? For sale), phosphorus chemicals such as " SumUizer " p_i6 (made by Sumitomo Corporation), nitrogen oxide traps such as HN-150 (manufactured by Japan Hydrazine Corporation), light stabilizers such as jumisorb "30 0 # 622 (made by Sumitomo), Hindered amine stabilizers include various 1 nuv 1 η type, inorganic pigments such as titanium oxide, titanium oxide, carbon black and the like, metal salts such as magnesium stearate and barium sulfate, and bactericides containing silver, zinc or their compounds , Deodorant, various antistatic agents, thorium oxide, betaine, phosphoric acid and so on. In the method of the present invention, 'Poly (N-vinyl-2-pyrrolidone is hereinafter referred to as PVP11) and / or a copolymer of vinyl-2-pyrrolidone is added to a polyaminoacetic acid solution', and the final elastic fiber has ρνρ Or ρνρ copolymer content in the range of about 10% by weight (preferably about 1.5-7%), based on the total polymer

V. Description of the invention (7) The solid content (based on the f-dimensional polymerization of strontium hydrazolidine) is based on the weight. ° It can be used in the PVP copolymerization of the present invention in comparison with N_2-diluted 2-B Proper copolymerization of things. Any suitable volume: acid vinyl vinegar and N-J monobutenyl pyrrolidine formate. You can use ☆ to add PVP or its copolymer to polyamines. The typical example of right brake recognition θ includes the use of a static mixer, stirring, etc., and adding PVP evenly and strictly, because it will make it easy to add it to the ammonia solution. In addition, you can also add Bu, + at the same time, several invitations from the local encryption 败 丨, ancestor ten fine Γ The above chemicals, such as light stabilizers, antioxidants, cosmetics, or similar, such as Join as a body. In order to obtain the best spinnability of the polyurethane pV-8 + fiber denier, the value of "κ" of a certain ii j :: pvp polymer is 20-70 (preferably 26-34). When spinning is low, the viscosity of the spinning solution is excessively reduced, and the yarn is continuous. When the molecular weight of pvp is too high, the spin: heart 1 is too high to spin. For a discussion of the K value and its relationship with PVP points, please read " PVP_ Acrltic Knife the Kinetics and Toxicology of 〇ί

Polyvinylpyrrolidone (Povidone), B. V. Robinsonf Λ ::: W1S Publishing Company, 199. year. In order to improve the purity of PVP, PVP is better. ‘Synthesis of β in isopropanol solvent, car 乂 22, the method of Ming’ is to spin polyurethane to form elastic fibers, and then take up. As shown in Figure i, the household = fencarboxate solution is extruded from the inside and outside of the dry spinning chamber 12. In the solution, the ## P lifeπ A spray from the spinneret, the enthusiasm and the enthusiasm flowing into the room along with the enthusiasm gas flow from the inlet 14). Spin solution 4 54 01 *-V. Description of the invention (8) / together 丨 It is evaporated into the hot inert gas, so 4 f they are converted into a continuous bomb solution stream as the inert gas flow is Available via inlet 18 = force fiber 16. The countercurrent body flow now contains the evaporating radon, that is, the two inert gases 20 are extracted. The aspiration device to the bottom The filament bundle emerges from the hole 30 at the bottom of the chamber to the first wire feeding (guide wire) roller 28. ㈣22 series ^ = coagulation nozzle M flow is selected. Then, the elastic fiber is supplied through the optional supply port 24 to apply J (msh wide 32 drive and optional drive 2) from the optional storage tank 33, and the circular guide 2 moves the guide rod 36. The optional figure 1 shows the seven chromium M & The elastic fiber is wound on it. Many (including 7, rr2, 4 = ^ ^ f ^ # 1 *, 4 ") ^ ^ ^ ^ ^ ^ ^ ^ can also be agglomerated by the method of the present invention: tr: i 1 Multi-filament. The configuration of single-filament can be made;. The shape of the spinning room and the speed of the first V silk roll (feed roll) of the roll other than those shown in the figure ... Linear migration (ie, improved, low early filament detection frequency and less agglomeration of monofilaments). This-effect is obvious in aggregating multifilaments 早, '', '', is obvious, although single Fibrils also saw some improvements

Ptd Page 11 C: \ Program Files \ Patent \ 55517.

Λ 54 G

Fibrils usually have a higher decitex, which is higher than the higher decitex of the yarn, such as 50 cents, 77 cents and higher. When spinning more filaments, such as 24 to 12: 拄, the effect can be more significant. "Shi" improvement is also, more subtle spinnability improvement is shown in the reduction of denier variability coefficient (hereinafter referred to as CDV "). The decrease in CM indicates polyurethane: the uniformity of the yarn along the yarn is improved, This reflects the improvement of spin spinning /: The effect of adding PVP on CDV is the most expensive in yarns with higher cents taxis, but 'can also be observed in smaller filaments. · &Quot; ,,'-Bay Polyurethane urea-This is an amine that is a specific subgroup of polyurethanes with chain extension by low molecular weight amines such as (hereinafter referred to as " EDA ") ^ Benefit from the addition of PVP. At 1% by weight and 6% by weight of PVP, the spinnability and CDV of polyacetate urea-based elastic fibers were actually worse than those of the control group without pvp H 2 = gallate urea. ^ The present invention will be described in more detail in the following examples. The viscosity of the polyurethane / DMAc solution is based on ASTM D1 343_69 — Method DV-8 Falling Ball Viscosity Meter (Duratech, ffaynesborr, VA sold) at 40 The measurement is performed at 〇c. For J, determine the amount of PVP present in the elastic fiber, and dissolve 100 mg of fiber sample in 5 mM DMAc. 20 ml of ethanol was added to the obtained solution for the second time, and the components of this polymethylene carbamate (or polyurethane urea, depending on the nature of the sample) were precipitated. The remaining solution was subjected to high-speed liquid chromatography Analysis. Quantitatively determine PVP using a predetermined calibration curve made from a known concentration of P vp solution. Calculate pVp content using the following equation:

^ D5 2

4 54 OS 2 V. Description of the invention (11) The fiber system is composed of three agglomerated filaments, 44 cents taxi elastic agglomerated filaments, and 77 cents taxi elastic fiber is composed of 5 filaments =

Use K-value of 30 (available from Japan International Specialty Products Co., Ltd. or P Division or German BASF Company). "Chemical Glycol" in the table "Glycol" refers to the polymer COMP used "table is not a comparative example, " v " refers to the pole, " n m " means not " co-pvp " Denotes that Baozhong-Ethyl-2_2, OH, and 疋 'are used, and CE refers to the chain extender used. ^ ^ In the example, the CDV of the 20-point taxi monofilament elastic fiber is 10, and m When the content is within the present invention, 6 to 8 β νρι is about 9 Example 1 At 6,050 g of DMAC +, 2730 g of molecular weight 2100 p 9 was added: 1 (end-capped ratio 3.). . Then add two ... to 70 C and stir for 7 hours. This is an example of a one-step solution polymerization method. The molecular weight of this polymer is about 85,000, and the obtained polymethyl 3 = m39% weight concentration) viscosity ( The centroid is measured by the falling ball viscosity method. The spin spinning solution is prepared: 61.8 g of PVP2DMAc solution (Kanto Chemical === manufacturing '40% PVP weight concentration) and additive polymer are added to 202 g Acetic acid / DMAc solution, and the mixture was stirred for 2 hours. The spin 2 cold liquid was dry-spun at a speed of 540 m / min. The speed ratio between the second godet roller and the take-up roller (& quot The take-up draw ratio is 1.40 to obtain a spandex fiber containing 27% by weight pvp 2 0 cents.

Comparative Example 1 A A solution of 19.9 g of PVP in DMAc (40% by weight, Kanto Chemical Co., Ltd.)

C: \ Program Files \ patentX55517 > ptd page 14 4S40ii V. Description of the invention (12) Added to 197 g of the same polyurethane solution of Example i as the spinning solution. The resulting spin-spun solution was dry-spun with quick-strength rice to obtain 0.8% by weight of 20 cents taxi spandex fiber. · Under low-knife taxis, CDV 戍 A between 0.8% by weight and 0% pvp. The difference in his spinnability measures is small, as shown in Table 丨. ] [CDV or its Example 2] 63.0 grams of PVP in DMAc (40% by weight, "Rubiskol" manufactured by BASF) was added to 1 983 grams of polyamino group substantially the same as the example plant, followed by stirring for 2 hours and A spin spinning solution was obtained. The elastic fiber was spun as in Example 2. ..., '

Comparative Example 1 B means that the polyurethane ^ / DMAc solution (39% by weight) prepared in Example 1 but without pvp was dry-spun. The speed ratio between the second godet roller and the take-up roller was 4 °, and the speed was 540 m / min to obtain 20 cents of taxi stretch fiber. Table Example 1 Comp. (I GLYCOL P04G P04G (ethylene glycol) C.E. 2G 2G PVP, wt% 2. 7 0. 8 cents Taxi 20 20 Spinnability Excellent (V) Excellent

(Comparison) 1A 2 Corap · (Comparison) 1B P04G P〇G

2G 2G 3.0 〇 2 0 2 0 pole (V) Jiajia 'as shown in Table 1 ’Adding PVP to homopolyether substrate, ethylene glycol extended polyamine

C: \ ProgramFiles \ Patent \ 55517.ptd page 15

4β4觧 V. Description of the invention. (14) Table II 3 Comp · (comparison) 2 4 Comp. P04G P04G P04G P0G 2G 2G 2G 2G 2. 0 0.0 2.0 0. 0 50 50 77 77 14 22 30 n. M. Example GLYCOL C. E.

PVP, wt% Fentex CDV Table II presents the results showing that when dry spinning agglomerates multifilaments, it is beneficial to add PVP to a polyurethane solution. At about 50 cents taxis, the CDV was improved from 22 to 14 when 2% by weight PVP was added. At about 77 cents taxi, the fiber cannot be collected without PVP, but when 2% by weight of PVP is added, the fiber can be dry-spun. Example 5 In 6,000 g of DMAc, 2900 g of molecular weight of PO4G, 879 end: 3.5) and 225 g of 1,4-butanediol were added. The solution was heated to and stirred for 5 hours, after which 20 g of n-butanol was added to stop the polymerization. The liquid concentration was about 40% by weight of polyurethane. The meaning of the polymer is 440 °, and the v valley fluid is obtained by adding an additive paddle and g 2 p swallowing " Rubiskol " PVP in a DMAc solution (40% PVP weight, Tri · g polyamino / DMAc solution). The spin-spinning solution was weighed to 20 g / min and the take-up draw ratio was U0. Night-dry spinning ’speed is 540 meters Comparative Example 4

C: \ ProgramFiles \ Patent \ 55517.ptd page 17

It will be prepared as in Example 6. Polyamide, which has been mixed with He Li Tian You / nuAP, orally, but has not been added with PVP.

The meaning of the base 8: § / DMAC spin solution dry weight M is 540 m / min * c, η soil / eight squares, and the pick-up stretch ratio is 1. 40 'speed Example GLYCOL CEPVP, wt ° / 〇fende Spinnability Table III 5

P04G 4G

Very good (V)

Comp. (Comparison) 4 P04G 4G 0.9 20 It shows that when PVP is added to the polyurethane solution, the dry spinnability of the polyurethane s extended by u-butylene is also improved, even if spinning is 20 cents When monofilament. Example β: In 6000 grams of DMAc, '2916 grams of 3-fluorenyltetramethylene ether groups containing 1 is 12.5 mole% and molecular weight is 3 ^ 134.0 (^, 837 grams swollen 1 (End-capping ratio 4.0) and 225 grams of 1,4-butanediol. The mixture was heated to 65 ° and stirred for 5 hours. Butanol (20 grams) was then added to stop the polymerization and form a 40% 1% polymerization Concentration of polyurethane / DMAc solution. The number and molecular weight of polyurethane is 85,000, and the viscosity of the solution is about 4,300 poise. The stabilizer additive slurry and 55.4 grams " Rubiskol " PVPiDMAc solution (40% PVP weight concentration) was added to 1 792 grams of polyaminoacetic acid solution, followed by stirring for 2 hours. The resulting solution was dry-spun at a speed of 54 m / min

'Μ4 # 4 · 6'6' V. Description of the invention (16) '一-and the take-up stretching ratio is 1.4. Comparative Example 5 In the polyurethane / DMAc solution of Example 6, 'additive slurry was added without PVP, and the resulting spinning solution was dry-spun, and the speed ratio between the second godet roller and the take-up roller was 1. 40, the speed is 540 m / min. Example 7 A knife was used to prepare a polyurethane-based elastic fiber in substantially the same manner as in Example 6, but the end-capping ratio was 3.0, the chain extender was ethylene glycol, and the content of pVp in the dry-spun elastic fiber was 3 〇wt%. Comparative Example 6 The polyurethane of Example 7 was dry-spun, but not MPVp.

Table IV Example 6 Comp. (Comparison) 5 7 Comp. (Comparative) 6 GLYCOL 3MeP04G 3MeP04G 3MeP04G 3MeP〇4G CE 4G 4G 2G 2G PVP, wt ° / 〇2.9 0.0 3. 0 0.0 0.0 cents 20 20 20 20 Spinnability (V) Allison (V) Allison As shown in Figure IV, the dry spinnability of copolyether urethane-based elastic fibers is also improved by adding PVP to the spinning solution. When manufacturing monofilaments 0 Example 8 Ganex P-904 (Ethylpyridoxone / 1-butylpyridylpyridone

C: \ ProgramFiles \ Patent \ 55517.ptd Page 19 V. Description of the invention (17) 90/1 0 copolymer, Tokyo International Specialty Products Co., Ltd.) was added to the same polyurethane as in Example 1 in the heavy solution of ⑽ μ Ester soluble / hour. Dry spinning the spinning solution at a speed of fine meters per minute and take-up and draw-out = with monofilament elastic fibers with 2G cents taxi, excellent spinnability. Elastic fibers contain 2.6% by weight pv p copolymer. Example 9 ', S-630 (vinylpyrrolidone / vinyl acetate copolymer, International Specialty = $ Division) in a 40% by weight solution of DMAc was added to the same carboxylic acid vinegar solution as in Example 丨, and mixed 2 hour. The spinning conditions are true and the spinnability is excellent. Elastic fibers contain 3.0% by weight pvp copolymer.

Table V Examples GLYCOL C. E. PVP, wt% Pentex Spinnability Dry spinnability of the osmic esters is also shown in Table V. The effect of copolymers of PVP on the benefits of polyamino groups is shown in Table V. Comparative Example 7 Po4G (9,000 g) with a molecular weight of 18,000 was mixed with MDI (20 g) (blocking ratio 1.58) 'heated to 9 (rc and stirred for 2 hours to prepare isocyanate) Cyan '4§4§§ t

V. Description of the invention (18) Prepolymer of acid and vinegar termination. The prepolymer was cooled to room temperature. Five hundred grams of the prepolymer were dissolved in 1,000 grams of DM Ac. 7.8 g of ethylenediamine and 1.17 g of diethylenediamine were dissolved in 80.7 g of DMAc 'and the resulting solution was added to the prepolymer solution and stirred rapidly. The resulting polyurethane solution contained 33% by weight solids. A 33% by weight solution of PVP in DM Ac (98 g) was added to the polyurethane solution. The spin-spinning solution was dry-spun, the suction temperature was 4200c, the spin-spinning speed was 670 m / min, and the take-up draw ratio was 121 to form 4-fibril filaments, 44 centimeters of agglomerated elastic fibers. 〇wt% pvp. The CDV is 22. Comparative Example 8 Table Repeat Comparative Example 7 but save PVP. The CDV of the obtained elastic fiber is 17 which shows that the uniformity and spinnability are better than when PVP is present. Table VI Example C0mP. (Comparative) 7 GLYCOL P04G C. Ε · 2G PVP, wt% 6.0 Fentex 44 CDV 22

Comp. (Comparison) 8 P04G 2G 0.0 44 17 Table VI shows that the adverse effects of the 'polyurethane's self-determining brain, even on the presence of PVP in agglomerated multifiber: spun solution, were observed to the contrary. 'Q ’which is related to polyurethane

C: \ Program Files \ Patent \ 55517. Ptd

Claims (1)

~~~ ---- The scope of patent application for a method for preparing elastic fibers A Mao includes the following steps: • Prepare a polymer solution consisting of: 1,1, ~ methylene bis (tetramethylene glycol and poly (tetramethylene): ^ methyl "" "selected from the group consisting of diols 13 ~ Proxyl; 51 / selected polyether ethylene glycol; and-alcohol selected from the group consisting of ethylene glycol, D.. '_ Butanediol; D. in step A He Yanxi Leng V 丄 丫 进 £ 〇 〇 1 — ，, weight% of poly (ethylene): 加入 added to the total polymer solids content of the group consisting of the polymer '2 2 垸 垸 垸 2 垸) And the PVP copolymer ^ The solvent dry spinning bomb prepared in step B D. Take up the elastic fibers. 2. Take the elastic fibers, and 2. According to the scope of the patent application, gather multiple filaments. The core method, where the elastic fibers are Ning 3. According to the second entry in the scope of the patent application, the elastic I dimension has a PVP polymer (thus the pvp polymer plus the weight), and = 1.5-7% (to the elastic fiber 4. According to the patent application: the first taxi is at least about 40. The value is 20-70, and the elastic fiber is in the $ method, where K of the MP polymer 5. Take the stretch ratio 1 according to item 3 of the scope of the patent application 1 5 -1. 6 5 Take-up. Poly (tetramethylene ether-co-3-methyltetramethylene method, in which the polyether glycol alcohol and 1,4-butanediol are composed) Ethylene glycol, which is selected from ethylene glycol according to item 5 of the scope of the patent application. 3. A method in which the content of monomethyl tetramethylene ether group is 4, wherein the average molecular weight of the polyether ethylene glycol is 2500. -6000. Within the range of 20 mol% and the amount is flat C: \ Program Files \ Patent \ 55517. Ptd 4S40 窆 6. Patent application scope 7. According to the method of patent application scope item 3, wherein the polyether glycol is poly (tetramethylene ether) glycol, and The diol is selected from the group consisting of ethylene glycol and 1,4-butanediol. 8. —An elastic fiber prepared by the method of the first patent application. 9. An elastic fiber prepared by the method in the patent application No. 6. C: \ Program Files \ Patent \ 55517.ptd page 23