JP2003003327A - Polyester partially oriented undrawn filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester partially oriented undrawn filament that is suppressed the orientation while the filament is extruded, and has largely increased fiber-forming properties, process-passing properties and productivity. SOLUTION: The polyester partially oriented undrawn filament comprises a polyester bearing the side chains of the structures satisfying the following conditions (i) and (ii) and an optical birefringence of 0.020-0.060: (i) the average molecular weight of the side-chain moiety (M) is 100-10,000; (ii) the chemical structures in the side chain moiety is substantially unreactive in the chemical process in the production of the polyester.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a partially oriented polyester unoriented yarn. More specifically, the present invention relates to a polyester partially oriented unstretched yarn that is excellent in yarn formability, drawability, process passability, and productivity.

[0002]

2. Description of the Related Art Polyester has been used in a large amount and in a wide variety of fields because it has various properties such as dimensional stability and elastic recovery. Among them, polyester fibers such as polyethylene terephthalate have mechanical properties. It is widely used due to its excellent properties such as chemical properties and easy care, and is usually used after being subjected to processing such as melt spinning, drawing and heat setting.

In recent years, the take-up speed is 2000 to 4000.
The partially oriented undrawn yarn (hereinafter abbreviated as POY) having m / min has an advantage that it can be used not only for drawing but also for drawing false twisting, and is industrially important. Occupy a unique position. On the other hand, as the demand for improved productivity increases, attempts have been made to improve the productivity per unit time by increasing the POY take-up speed. Causes a problem that the mechanical properties of the fiber, such as an increase in orientation and a decrease in residual elongation, are changed as the take-up speed is increased. For the purpose of solving this problem and obtaining a fiber having a residual elongation equivalent to that at a low take-up speed even when the take-up speed is increased, the molecular orientation of the polyester, which increases as the take-up speed increases, is suppressed. Many means have been considered.

For example, there is known a method of suppressing the molecular orientation of polyester by adding a polyfunctional branching agent to polyester and copolymerizing the same.

JP-A-53-292 discloses a method of improving the stretching ratio by copolymerizing polyester with a polyfunctional branching agent (described as a chain branching agent in the publication). This technology improves the stretch ratio by increasing the elongation,
That is, although the effect of suppressing the orientation during spinning is recognized, a decrease in strength of the spun yarn is unavoidable, and in addition, due to this decrease in strength, spinnability, particularly high-speed spinnability and a process in which yarn breakage frequently occurs in the drawing process. Passability deteriorates, and as a result stable production becomes difficult, so improvement in productivity cannot be expected.

Further, Japanese Patent Laid-Open No. 11-61568 discloses that
Addition of a vinyl polymer having a low molecular weight modifying component such as 1200 or 3000 to polyester, and the vinyl polymer reacts with the polyester to form "molecular crosslinks", thereby suppressing polyester orientation. The technique of making it disclosed is disclosed. This technique is a technique in which a vinyl polymer having a low molecular weight is used to act as a molecular polyvalent crosslinking agent. However, the ester-forming reactive group on the side chain of the vinyl polymer has a distance (branching point) between the reactive groups. (Interval) is too small, gelation easily occurs inside the polymerization reactor or spinning machine,
There is a problem that foreign matter is formed and the yarn formability is deteriorated.

On the other hand, as a means for suppressing the oriented crystallization of polyester, a method of adding polyether (polyalkylene glycol) to polyester and copolymerizing it is also known.

In JP-A-58-186611, a low-molecular-weight polyether is added to polyester and copolymerized.
Techniques for melt spinning at high take-off speeds have been disclosed. According to the technique described in this publication, "crystallization" of polyester fibers melt-spun at a drawing speed of 2000 m / min or more is suppressed, while "highly oriented" fibers are obtained, and The yarn breakage is greatly reduced and the strength of the spun yarn is improved. However, at the same time, the elongation is also lowered, and orientation formation is rather promoted, and the productivity is not improved, which is not preferable.

[0009]

The object of the present invention is to solve the above-mentioned problems of the prior art, and to improve the spinnability, stretchability, stretch false twisting process passability, stretched yarn physical properties, and productivity. An object is to provide a partially oriented polyester undrawn yarn.

[0010]

DISCLOSURE OF THE INVENTION The present invention suppresses the molecular orientation which increases with an increase in the take-up speed, and has a spinnability,
In order to obtain a polyester partially oriented unstretched yarn having good stretchability and passability in the stretch false twisting process, diligent studies have been conducted, in which a polyester having a side chain with a specific number average molecular weight and a chemical structure is specified. The inventors have found that the drawbacks of the prior art can be solved by using an undrawn yarn having a birefringence, and arrived at the present invention.

That is, in the present invention, (i) the side chain portion has an average molecular weight (M) of 100 to 10,000, and (ii) the side chain portion has a chemical structure which is substantially non-reactive in the production of polyester. The present invention provides a partially oriented polyester unoriented yarn having a birefringence of 0.020 or more and less than 0.060, which is composed of a polyester having a side chain having a structure satisfying the condition.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester referred to in the present invention means
It is a polymer formed from an ester bond of a dicarboxylic acid compound and a diol compound, preferably polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate, more preferably polyethylene terephthalate. Further, other components may be copolymerized within a range not impairing the gist of the present invention, and examples of the dicarboxylic acid compound as a copolymerization component include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, Aromatic, aliphatic and alicyclic dicarboxylic acids such as diphenyldicarboxylic acid, adipic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 5-sodium sulfoisophthalic acid, 5-tetrabutylphosphonium isophthalic acid and their derivatives Among these dicarboxylic acid compounds, one kind may be used alone, or two or more kinds may be used in combination within a range not impairing the gist of the invention. As the diol compound,
Examples thereof include aromatic, aliphatic and alicyclic diol compounds such as ethylene glycol, propylene glycol, butylene glycol, tetramethylene glycol, 1,4-cyclohexanedimethanol and neopentyl glycol. Of these, one kind may be used alone, or two or more kinds may be used in combination as long as the gist of the invention is not impaired.

Further, the polyester of the present invention is a matting agent, a flame retardant, a lubricant, an antioxidant, within a range not impairing the gist of the invention.
UV absorber, infrared absorber, crystal nucleating agent, optical brightener,
You may contain a small amount of additives, such as an end group sealing agent.

The polyester of the present invention has a side chain, and the average molecular weight (M) of the side chain portion is 100 to 1000.
Must be 0. When the average molecular weight (M) of the side chain portion is less than 100, the orientation-inhibiting effect, which will be described later, is less likely to be exhibited, or the effect becomes small, and the target improvement in productivity can be achieved in the present invention. Absent. When the average molecular weight (M) of the side chain portion exceeds 10,000, the compatibility with the polyester of the main chain due to the chemical structure of the side chain is deteriorated, or phase separation easily occurs, and as a result, It is not preferable because it may cause deterioration of processability.

Although the polyester of the present invention has a side chain, it is necessary that the side chain portion has a chemical structure which is a substantially non-reactive structure in the production of polyester. Here, “substantially non-reactive in the production of polyester” refers to a compound added in producing a polyester by a polycondensation reaction in the present invention (hereinafter referred to as a side chain forming agent), and side chain formation to be added. During the polycondensation reaction of the polyester of the side chain forming agent to be added, only the functional group capable of reacting during the polycondensation reaction of the polyester of the agent, or only the functional structural unit composed of a plurality of functional groups reacts in the polycondensation reaction. Even if the portion other than the functional group capable of reacting with or a functional structural unit composed of a plurality of functional groups is some functional group or has some functional group, the "some functional group" is a polyester. It means that it does not participate in the polycondensation reaction of. When the side chain portion is reactive in the production of polyester, the formation of a "precision controlled branched structure" as described later cannot be performed, extension viscosity cannot be controlled, and a random branched structure is not formed. Expression, and then progresses from a branched structure to a crosslinked structure that binds polyester molecular chains to each other,
In addition to the possibility of infusible matter, deterioration of filterability during melt spinning, or deterioration of spinnability, even if melt spinning is successful, the strength and the strength of the drawn yarn or drawn false-twisted yarn may decrease. Such as frequent thread breakage
In the spinning or drawing process, there is a possibility that the spinning property and process passability may be deteriorated, which is not preferable.

Further, the chemical structure of the side chain portion is not particularly limited as long as it has a chemical structure consisting of a substantially non-reactive structure in the production of polyester, and for example, a polyethylene polymer, Repetitive structure such as so-called polyvinyl (vinyl addition polymerization type polymer) such as polystyrene-based polymer and polypropylene-based polymer or its derivative, polyalkylene oxide or its derivative, copolymer having alkylene oxide and vinyl group as a repeating unit or its derivative Examples of the polymer chain portion or oligomer chain portion having
These are preferred because they are formed of relatively flexible polymer chains. Among them, process handling and compatibility with polyester (compatibility) are particularly good,
A polyalkylene oxide or its derivative, a vinyl addition polymerization type polymer, from the viewpoints of achieving high strength and high elastic modulus derived from intermolecular interaction or being a crystalline molecule, and having a viscosity reducing effect. Further, a derivative thereof, a copolymer having an alkylene oxide and a vinyl group as a repeating unit, or a derivative thereof is more preferable. Further, a polymer chain portion or an oligomer chain portion having the repeating structure selected as the chemical structure of the side chain portion is, for example,
Either one kind may be used or a plurality of kinds may be used in combination.

The polyalkylene oxide or its derivative, vinyl addition polymerization type, which is considered to be preferable among the polymer chain portions or oligomer chain portions having the above-mentioned repeating structure selected as the chemical structure of the side chain portion will be described below. Specific examples of a polymer or its derivative, a copolymer having an alkylene oxide and a vinyl group as a repeating unit, or a derivative thereof will be described. Needless to say, the chemical structure of the side chain portion of these polyalkylene oxides or polyvinyl and polyalkylene oxides It is not limited to copolymers only.

The chemical structure of the polyalkylene oxide is a repeating structure in which an oxygen atom is alternately bonded to a group (or group) having a main chain of carbon such as aliphatic, aromatic or alicyclic. There is no particular limitation as long as it has the following formula, and for example, a polyalkylene oxide having a single alkylene oxide represented by the following general formula (a) as a repeating unit can be used. -[(CH2) a-O] m -... (i) As a thing satisfying a formula (i), for example, polyoxymethylene (a = 1), polyethylene oxide (a =
2), polypropylene oxide (a = 3), polytetramethylene oxide (a = 4), and other polyalkylene oxides.

As the polyalkylene oxide,
For example, it may be an alternating, random, or block copolymer of different alkylene oxides represented by the following general formula (b). -{[(CH2) a-O] m-[(CH2) b-O] n} x -... (b) (b) As a compound satisfying the formula, for example, poly (oxymethylene-oxyethylene) Polymer (a = 1 or 2, b = 1 or 2, and a and b may be the same or different), poly (oxyethylene-oxypropylene) copolymer (a = 2 or 3, b = 2 or 3, or a and b may be the same or different), poly (oxymethylene-oxyethylene-oxypropylene) copolymer (a = 1 or 2 or 3, b = 1 or 2 or 3, and a and b may be the same or different.) And the like, and copolymers of different alkylene oxides.

Further, as the polyalkylene oxide, one kind of the polyalkylene oxide represented by the above general formula (a) or (b) may be used alone, or within a range not impairing the gist of the invention. You may use what combined 2 or more types in the range which does not impair the gist of an invention.

As the polyvinyl (vinyl addition polymerization type polymer), the above-mentioned polyethylene-based polymer,
In addition to polystyrene-based polymers and polypropylene-based polymers, there are polybutylene-based polymers, polypentene-based polymers, poly (alkyl vinyl ether) -based polymers, etc. These may be used alone or in combination of two or more. However, it doesn't matter.

Further, the copolymer having alkylene oxide and vinyl group as a repeating unit may be any of the above-mentioned polyalkylene oxide copolymerized with polyvinyl (vinyl addition polymerization type polymer), for example, polyethylene- Polyalkylene oxide copolymers, polypropylene-polyalkylene oxide copolymers, polystyrene-polyalkylene oxide, and the like, these copolymers, block copolymers, alternating copolymers,
Any of random copolymers may be used, and these copolymers may be used alone or in combination of two or more.

The polyester of the present invention has side chains, and the number of side chains in the polyester molecular chain is as follows.
Although not particularly limited, the average molecular weight of the polyester main chain is X, and the number of side chains per polyester main chain, from the viewpoint of achieving a more effective orientation suppressing effect or improvement in productivity. When A is A, it is preferable that the relationships of the following formulas (1) and (2) are satisfied. B / 500 ≦ A ≦ 10B (1) B = X / 20000 (2) By satisfying the formulas (1) and (2), the number of side chains relative to the polyester main chain, or side chains Is optimized, and a more effective orientation suppressing effect is exhibited.

The polyester partially oriented undrawn yarn of the present invention has an average molecular weight (M) of the side chain of 100 to 10,000, and the side chain portion has a chemical structure which is substantially non-reactive in the production of polyester. It must have a special chemical structure and have a birefringence of 0.020 or more and less than 0.060. When the birefringence is 0.020 or more and less than 0.060, the process passability during drawing or draw false twisting is good, and the workability in false twisting is improved. However, the birefringence is 0.020
If it is less than the above, a large draw ratio can be set at the time of drawing or draw false twisting, but since a high draw ratio is required, the draw tension becomes large, so that yarn breakage easily occurs and fusion or fusion It is not preferable because deterioration of processability such as yarn breakage is observed. The birefringence is 0.0
When it exceeds 60, the draw ratio that can be set becomes small, the productivity is rather lowered, and the yarn feeding property in the drawing process or the draw false twisting process, so-called "ballooning", is likely to occur, resulting in poor processability. This is not preferable because it causes a problem in the yarn quality.

Further, the polyester partially oriented undrawn yarn of the present invention has a birefringence of 0.020 or more and less than 0.060, and as a method for obtaining a polyester partially oriented undrawn yarn having a birefringence range. Although not particularly limited, it can be obtained by performing melt spinning at a high take-up speed of, for example, 3000 m / min or more. However, compared with the melt-spun yarn of polyester having the side chain structure,
When a polyester having no side chain structure was melt-spun in the same manner and compared with a melt-spun yarn similarly obtained at a take-up speed of 3000 m / min or more, at the same take-up speed, a polyester having a side-chain structure was obtained. The birefringence of the melt-spun yarn obtained by melt-spinning polyester having no side chain structure portion at a take-up speed of 4000 m / min, in which the fiber orientation is largely suppressed, and the birefringence index is 0.60 or more, Have.
That is, when the polyester having a side chain structure of the present invention is melt-spun and a polyester partially oriented undrawn yarn having a birefringence of 0.020 or more and less than 0.060 is obtained, an orientation suppressing effect is exhibited. By using this polyester partially oriented unstretched yarn, it is possible to achieve an improvement in productivity such that a larger stretch ratio can be set during stretching or during false twisting. Although the details of the mechanism for suppressing the orientation are not clear, it is considered as follows.

The formation of molecular orientation in melt spinning of polyester is affected by the spinning tension (elongation stress), and this elongation stress is due to the elongation viscosity of polyester. Therefore, in order to obtain a fiber in which the molecular orientation is suppressed even when the take-up speed is increased in the yarn making process, a portion having a large extensional viscosity is formed in a part of the polyester so as to bear a stress, and the other polyester part The elongation stress may be reduced or the elongational viscosity of the entire polyester may be reduced.

Therefore, the polyester has a side chain structure having an average molecular weight (M) of the side chain part of 100 to 10,000 and a chemical structure of the side chain part having a substantially non-reactive structure in the production of polyester. By having it, a part of the polyester has a large elongation viscosity (takes an elongation stress) as a long-term relaxation component having a constant controlled relaxation time, and as a result, a polyfunctional branching agent or the like is added to the polyester. When a branched structure having a random length that is formed when a branched structure is formed or a crosslinked structure that binds the molecular chains of polyester is expressed, or compared with the case where the polymer components are simply mixed, The polyester having a side chain of the present invention has a characteristic effect such as "a partial extensional viscosity increase derived from a side chain structure whose length is controlled". It represents, when forming a partially oriented undrawn yarn with a polyester of the present invention is believed to be very large orientation suppressing effect is expressed.

In the prior art, as described in, for example, Japanese Patent Application Laid-Open No. 53-292, the branch structure derived from the copolymerization of only the branch structure-forming molecule with the polyester causes a large degree of orientation suppression. Although effective, on the other hand, it could not control the formation of the branched structure, which was also the cause of the strength reduction. In addition, JP-A-11-6156
The vinyl-based polymer introduced with the low-molecular weight modifying component used in JP-A No. 8 has an excessive distance (distance between branch points) between the reactive groups of the ester-forming reactive group in the side chain of the vinyl-based polymer. Since it is small, the formation of a branched structure cannot be controlled, and there is a problem that foreign matter is formed inside the polymerization reactor or the spinning machine and the spinnability is deteriorated. In other words, in the method in which a compound capable of forming a branched structure is simply added to the polyester and copolymerized, an orientation-inhibiting effect is exhibited but an effective branched structure is poorly formed, and a controlled branched structure is formed. Not only that, but rather it forms a branched structure with an excessive length that is the root of the excessive increase in extensional viscosity, or "gelation" occurs, resulting in frequent yarn breakage. This resulted in deterioration of the yarn formability and process passability, and a good partially oriented undrawn yarn could not be obtained.

However, as used in the present invention, the average molecular weight (M) of the side chain portion is 100 to 10,000, and the chemical structure of the side chain portion is substantially non-reactive in the production of polyester. The polyester having a side chain structure is not only improved in strength due to good mechanical properties of the side chain portion but also controlled in the length of the side chain structure and never exhibits a crosslinked structure. Since the expression of a branched (side chain) structure has been achieved, the effect of suppressing the orientation is sufficiently expressed, and the generation of foreign substances resulting from the lack of the formation of an excessive branched structure / crosslinked structure is significantly suppressed. As a result, the strength is not reduced, and the contact running friction derived from the side chain structure is significantly improved. A very favorable effect, which could not be achieved by the method, is multi-dimensionally expressed, and as a result, it has an appropriate birefringence, that is, a degree of molecular orientation, and also improves the spinnability and process passability. Conceivable. In addition, these effects can be achieved only by having a side chain in the polyester molecular chain, and a great merit in the manufacturing process can be obtained, which is very preferable.

For the above reasons, the polyester partially oriented undrawn yarn of the present invention is obtained as a result of exhibiting a more effective orientation suppressing effect by precisely controlling the extensional viscosity, and the yarn formability, surface Due to the change in frictional properties and the improvement in mechanical properties of the fiber, it has excellent drawability and process passability, and since productivity improvement such as improvement in draw ratio can be achieved, it can be used as a base yarn for drawing or draw false twisting process. It is suitable.

The present invention will be specifically and more specifically described with reference to the following examples. However, the present invention is not limited to the following examples. The physical property values in the examples were measured by the following methods.

[0032]

EXAMPLES A. Intrinsic Viscosity Number [η] Measured by the Ostwald method in orthochlorophenol at 25 ° C. B. Strength / Elongation Using a Tensilon tensile tester manufactured by Orientec, an initial sample length of 50 mm for a partially oriented undrawn yarn and a pulling speed of 400 mm / min, and an initial sample length of 2 for a drawn yarn.
The measurement was performed at 00 mm and a pulling speed of 200 mm / min. C. Birefringence (Δn) It was determined from retardation and fiber diameter by a normal interference fringe method using a BH-2 polarizing microscope compensator manufactured by OLYMPUS.

Reference Example 1 In the production of polyester, a low polymer obtained by a usual esterification reaction from 166 parts by weight of terephthalic acid and 75 parts by weight of ethylene glycol was mixed with 0.03% of 85% aqueous phosphoric acid solution as a coloring inhibitor. By weight, antimony trioxide as a polycondensation catalyst is added in an amount of 0.06 part by weight, and cobalt acetate tetrahydrate is added as a toning agent in an amount of 0.06 part by weight to perform a polycondensation reaction. Got

Melt spinning was performed using this polyester, and a polyester yarn was obtained by taking it off at a take-up speed of 3000 m / min. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 1 shows the strength, elongation and Δn of this spun yarn.

The obtained polyester spun yarn is drawn at a drawing speed of 4
00m / min, 1st hot roller temperature 90 ° C, 2nd
Stretching was performed at a hot roller temperature of 120 ° C. so that the residual elongation was about 37%. No yarn breakage occurs during drawing,
No fluff was found in the wound yarn, and the drawability and process passability were excellent. The strength, elongation, and draw ratio of this drawn yarn are shown in Table 1.
Shown in.

[0036]

[Table 1] Reference Example 2 The polyester obtained in Reference Example 1 was melt-spun and drawn at a take-up speed of 4000 m / min to obtain a polyester yarn. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 1 shows the strength, elongation and Δn of this spun yarn. Δn compared to when the take-up speed is 3000 m / min
Increased and the elongation also decreased.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 1 shows the strength, elongation and draw ratio of this drawn yarn. As compared with when the take-up speed was 3000 m / min, the draw ratio was decreased due to the large Δn.

Reference Example 3 The polyester obtained in Reference Example 1 was melt-spun and drawn at a take-up speed of 5000 m / min to obtain a polyester yarn. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 1 shows the strength, elongation and Δn of this spun yarn. As compared with Reference Example 2, Δn was further increased and the elongation was further lowered.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. Although yarn breakage occurred several times during drawing, no fluff was found in the wound yarn, and drawability,
The process passability was generally good. Table 1 shows the strength, elongation and draw ratio of this drawn yarn. Collection speed is 4000m
A further decrease in the draw ratio due to the larger Δn was observed as compared with the case of / min.

Comparative Example 1 Polyethylene glycol (hereinafter abbreviated as PEG) having a number average molecular weight (Mn) of 1000 was used for the polyester after the polycondensation reaction was carried out in the same manner as in Reference Example 1. Add PEG component to 0.5% by weight,
Copolymerization was carried out by terminating the polymerization by adjusting the conditions so that the polyester main chain has the same average molecular weight as the polyester obtained by the method of Reference Example 1, and a copolymerized polyester was obtained.

A polyester yarn was obtained in the same manner as in Reference Example 2 using this copolymerized polyester. Although yarn breakage occurred several times during spinning, the spinnability was generally good.
Table 1 shows the strength, elongation and Δn of this spun yarn. Elongation is 1
At 19%, Δn was 54 × 10 ⁻³ , and the orientation was slightly suppressed as compared with Δn of the spun yarn shown in Reference Example 2.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. Frequent yarn breakage occurred during drawing. The strength, elongation, and draw ratio of this drawn yarn are shown in Table 1.
Shown in. The draw ratio was 1.3 times, which was larger than that of Reference Example 2, and although a slight improvement in productivity was observed, the drawn yarn strength decreased and the process passability was deteriorated.

Comparative Example 2 When a polycondensation reaction was carried out in the same manner as in Reference Example 1, the TMA component was adjusted to 0.3% by weight with respect to the polyester after formation of trimellitic acid (abbreviated as TMA). Polymerization was terminated by adjusting the conditions such that the polyester main chain having the same average molecular weight as the polyester obtained by the method of Reference Example 1 was added and copolymerized to obtain a copolyester.

Using this copolymerized polyester, a polyester yarn was obtained in the same manner as in Reference Example 2. Frequent yarn breakage occurred during spinning, resulting in poor spinnability. Table 1 shows the strength, elongation and Δn of this spun yarn. The elongation was 168% and Δn was 36 × 10 ⁻³ , which was Δ of the spun yarn shown in Reference Example 2.
The orientation was suppressed compared to n.

The polyester spun yarn obtained was drawn in the same manner as in Reference Example 1. Frequent yarn breakage occurred during drawing. Table 1 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio is 1.6 times, which is larger than that of Reference Example 2,
Although the productivity was improved, the drawn yarn strength was excessively reduced and the process passability was deteriorated.

Example 1 When a polycondensation reaction is carried out in the same manner as in Reference Example 1, the main chemical structure part has a value of a number average molecular weight (Mn) of about 2000 with respect to one polyester main chain after production. A side chain forming agent was added and copolymerized so that 1.8 polypropylene type side chains were formed, and the conditions were adjusted so that a polyester main chain having the same average molecular weight as the polyester obtained by the method of Reference Example 1 was obtained. After adjustment, the polymerization was stopped to obtain a copolyester.

Using this copolyester, a polyester spun yarn was obtained in the same manner as in Reference Example 2. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 1 shows the strength, elongation and Δn of this spun yarn. Elongation is 160%
In addition, Δn was 39 × 10 ⁻³ , and the orientation was largely suppressed as compared with Δn of the spun yarn shown in Reference Example 2.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 1 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was greatly increased to 1.7 times as compared with Reference Example 2, and it was shown that the draw ratio can be increased to obtain a drawn yarn having the same elongation.
The drawn yarn strength was also good. As a result, Reference Example 2
Compared with the above, in order to obtain a yarn having the same yarn physical properties, a polyester spun yarn can be obtained at a higher take-up speed, and a stretched yarn with a higher draw ratio without a decrease in strength can be obtained, and the productivity can be improved. Greatly improved.

Example 2 When a polycondensation reaction was carried out in the same manner as in Reference Example 1, the main chemical structure portion was a number average molecular weight (Mn) of about 1,000 with respect to 10.4 polyester main chains after production. A side chain forming agent is added and copolymerized so as to form one polyethylene oxide type side chain having a condition of obtaining a polyester main chain having the same average molecular weight as the polyester obtained by the method of Reference Example 1. Was adjusted to stop the polymerization, and a copolyester was obtained.

Using this copolyester, a polyester spun yarn was obtained in the same manner as in Reference Example 2. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 1 shows the strength, elongation and Δn of this spun yarn. 172% elongation
In addition, Δn was 37 × 10 ⁻³ , and the orientation was largely suppressed as compared with Δn of the spun yarn shown in Reference Example 2.

The polyester spun yarn obtained was drawn in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 1 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was greatly increased to 1.8 times as compared with Reference Example 2, and it was shown that the draw ratio can be increased to obtain a drawn yarn having the same elongation.
The drawn yarn strength was also good. As a result, Reference Example 2
Compared with the above, in order to obtain a yarn having the same yarn physical properties, a polyester spun yarn can be obtained at a higher take-up speed, and a stretched yarn with a higher draw ratio without a decrease in strength can be obtained, and the productivity can be improved. Greatly improved.

Example 3 Using the polyester obtained in Example 2, 3100 m
A polyester spun yarn was obtained by taking it off at a take-off speed of / min. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 1 shows the strength, elongation and Δn of this spun yarn. The elongation was 245% and Δn was 22 × 10 ⁻³ , and the orientation was largely suppressed.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 1 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was greatly increased by 2.6 times as compared with Reference Example 1, and as a result, similar to Example 2, in order to obtain a yarn having the same yarn physical properties, polyester spinning was performed at a higher take-up speed. A yarn was obtained, and a stretched yarn with no reduction in strength was obtained at a higher draw ratio, and productivity was also greatly improved.

Example 4 Using the polyester obtained in Example 2, 6000 m
A polyester spun yarn was obtained by taking it off at a take-off speed of / min. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 1 shows the strength, elongation and Δn of this spun yarn. Although the elongation was 110% and Δn was 58 × 10 ⁻³ , a spun yarn in which the orientation was suppressed was obtained despite the high take-up speed.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 1 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was 1.3 times, which was the same draw ratio as that of Reference Example 2 even though the take-up speed was greatly increased. As a result, a spun yarn was obtained at a higher take-up speed, and a drawn yarn with no reduction in strength was obtained at a large draw ratio, and productivity was greatly improved.

Comparative Example 3 Using the polyester obtained in Example 2, 1900 m
A polyester spun yarn was obtained by taking it off at a take-off speed of / min. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 1 shows the strength, elongation and Δn of this spun yarn. A spun yarn having an elongation of 380% and a Δn of 8 × 10 ⁻³ was obtained.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. Frequent yarn breakage occurred during drawing. The strength, elongation, and draw ratio of this drawn yarn are shown in Table 1.
Shown in. The draw ratio was 4.5 times, and although the spun yarn had a large elongation and a very low orientation degree, deterioration of the process passability due to the orientation degree being too small was observed.

Comparative Example 4 Using the polyester obtained in Example 2, 7200 m
A polyester spun yarn was obtained by taking it off at a take-off speed of / min. Although yarn breakage occurred several times during spinning, the spinnability was generally good. Table 2 shows the strength, elongation and Δn of this spun yarn. The elongation was 70%, and Δn was 90 × 10 ⁻³ , and an excessive increase in the orientation degree due to the high take-up speed was observed, and the effect of suppressing the orientation was small.

[0059]

[Table 2] The obtained polyester spun yarn was drawn by the same method as in Reference Example 1. Frequent yarn breakage occurred during drawing. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was as small as 1.1 times, the productivity was lowered, and the process passability was deteriorated due to the reduction of the drawn yarn strength.

Example 5 When a polycondensation reaction is carried out in the same manner as in Reference Example 1, the main chemical structure portion has a value of a number average molecular weight (Mn) of about 190 with respect to one polyester main chain after production. A side chain forming agent is added and copolymerized so that one side chain of polyethylene oxide-polyethylene copolymer type is formed, and a polyester main chain having the same average molecular weight as the polyester obtained by the method of Reference Example 1 is obtained. The polymerization was stopped by adjusting the conditions as described above to obtain a copolyester.

A polyester spun yarn was obtained by the same method as in Reference Example 2. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 2 shows the strength, elongation, and Δn of this spun yarn.
Shown in. The elongation was 189%, and Δn was 27 × 10 ⁻³ , and the orientation was suppressed as compared with Δn of the spun yarn shown in Reference Example 2.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, and no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio increased to 2.0 times as compared with Reference Example 1 or 2, and it was shown that it is possible to increase the draw ratio to obtain a drawn yarn having the same elongation. The drawn yarn strength was also good. as a result,
Compared with Reference Example 2, in order to obtain a yarn having equivalent yarn physical properties, a polyester spun yarn can be obtained at a higher take-up speed, and a stretched yarn without a decrease in strength can be obtained at a higher draw ratio. Greatly improved productivity.

Example 6 When a polycondensation reaction was carried out in the same manner as in Reference Example 1, the number of the main chemical structure portion of the 8.8 polyester main chain after production was a number average molecular weight (Mn) of about 8900. A side chain forming agent is added and copolymerized so as to form one polyethylene oxide type side chain having a condition of obtaining a polyester main chain having the same average molecular weight as the polyester obtained by the method of Reference Example 1. Was adjusted to stop the polymerization, and a copolyester was obtained.

A polyester spun yarn was obtained by the same method as in Reference Example 2. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 2 shows the strength, elongation, and Δn of this spun yarn.
Shown in. The elongation was 180% and Δn was 31 × 10 ⁻³ , and the orientation was largely suppressed as compared with Δn of the spun yarn shown in Reference Example 2.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. Although yarn breakage occurred several times during drawing, no fluff was seen on the wound yarn, and the drawability,
The process passability was generally good. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was greatly increased to 1.9 times as compared with Reference Example 2, and it was shown that the draw ratio can be increased to obtain a drawn yarn having the same elongation. The drawn yarn strength was also good. As a result, in comparison with Reference Example 2, a polyester spun yarn can be obtained at a higher take-up speed in order to obtain a yarn having equivalent yarn physical properties, and a drawn yarn with a larger draw ratio and no reduction in strength. Was obtained, and productivity was greatly improved.

Comparative Example 5 When the polycondensation reaction was carried out in the same manner as in Reference Example 1, the main chemical structure portion was a number average molecular weight (Mn) of about 12,000 with respect to 12.0 polyester main chains after formation. A side chain forming agent is added and copolymerized so as to form one polyethylene oxide type side chain having a condition of obtaining a polyester main chain having the same average molecular weight as the polyester obtained by the method of Reference Example 1. Was adjusted to stop the polymerization, and a copolyester was obtained.

A polyester spun yarn was obtained by the same method as in Reference Example 2. Although yarn breakage occurred several times during spinning, the spinnability was generally good. Table 2 shows the strength, elongation and Δn of this spun yarn. The elongation was 165%, and Δn was 39 × 10 ⁻³ , and the orientation was largely suppressed as compared with Δn of the spun yarn shown in Reference Example 2.

The polyester spun yarn obtained was drawn in the same manner as in Reference Example 1. Frequent yarn breakage occurred during drawing, and process passability was poor. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio increased to 1.7 times as compared with Reference Example 2, but a decrease in drawn yarn strength and a deterioration in process passability were observed.

Comparative Example 6 When a polycondensation reaction was carried out in the same manner as in Reference Example 1, the main chemical structure portion was a number average molecular weight (Mn) value of about 70 with respect to 3.6 polyester main chains after formation. A side chain forming agent is added and copolymerized so that one polyethylene oxide-polyethylene copolymer type side chain having a
Polymerization was terminated by adjusting the conditions so that the main chain of the polyester has the same average molecular weight as the polyester obtained by the above method, and a copolyester was obtained.

A polyester spun yarn was obtained by the same method as in Reference Example 2. Frequent yarn breakage occurred during spinning, resulting in poor spinnability. Table 2 shows the strength, elongation and Δn of this spun yarn. The elongation was 130%, and Δn was 51 × 10 ⁻³ , which is because the orientation was not suppressed so much as compared with Δn of the spun yarn shown in Reference Example 2, and the side chain portion was excessively generated. The deterioration of the spinning property was observed.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. Frequent yarn breakage occurred during drawing, and process passability was poor. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio increased to 1.4 times as compared with Reference Example 2, but a decrease in draw yarn strength and a deterioration in process passability were observed.

Example 7 When a polycondensation reaction is carried out in the same manner as in Reference Example 1, the main chemical structure part has a value of a number average molecular weight (Mn) of about 1500 with respect to 600 polyester main chains after formation. A side chain forming agent is added and copolymerized so that one side chain of polyethylene oxide-polyethylene copolymer type is formed, and a polyester main chain having the same average molecular weight as the polyester obtained by the method of Reference Example 1 is obtained. The polymerization was stopped by adjusting the conditions as described above to obtain a copolyester.

A polyester spun yarn was obtained by the same method as in Reference Example 2. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 2 shows the strength, elongation, and Δn of this spun yarn.
Shown in. The elongation was 142% and Δn was 48 × 10 ⁻³ , and the orientation was slightly suppressed as compared with Δn of the spun yarn shown in Reference Example 2.

The obtained polyester spun yarn was drawn in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio increased to 1.5 times as compared with Reference Example 2, and it was shown that it is possible to increase the draw ratio to obtain a drawn yarn having the same elongation. Also,
The drawn yarn strength was also good. As a result, in comparison with Reference Example 2, a polyester spun yarn was obtained at a high take-up speed in order to obtain a yarn having equivalent yarn physical properties, and a stretched yarn without a decrease in strength was obtained at a large draw ratio. Productivity was improved.

Example 8 When a polycondensation reaction is carried out in the same manner as in Reference Example 1, the main chemical structure portion has a number average molecular weight (Mn) of about 740 with respect to one polyester main chain after production. A polyester main chain having an average molecular weight similar to that of the polyester obtained by the method of Reference Example 1 by adding and copolymerizing a side chain forming agent so that 11.1 polyethylene oxide-polyethylene copolymer side chains are formed. The conditions were adjusted so that the polymerization was stopped, and a copolyester was obtained.

Polyester POY was obtained by the same method as in Reference Example 2. Although yarn breakage occurred several times during spinning, the spinnability was generally good. Table 2 shows the strength, elongation, and Δn of this POY. The elongation was 189% and Δn was 29 × 10 ⁻³ , and the orientation was largely suppressed as compared with Δn of POY shown in Reference Example 2.

The obtained polyester POY was stretched by the same method as in Reference Example 1. Although yarn breakage occurred several times during drawing, no fluff was found in the wound yarn, and drawability,
The process passability was generally good. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was greatly increased to 2.0 times as compared with Reference Example 2, and it was shown that the draw ratio can be increased to obtain a drawn yarn having the same elongation. The drawn yarn strength was also good. As a result, in comparison with Reference Example 2, a polyester spun yarn was obtained at a high take-up speed in order to obtain a yarn having equivalent yarn physical properties, and a stretched yarn without a decrease in strength was obtained at a large draw ratio. Productivity was also improved.

Example 9 When a polycondensation reaction is carried out in the same manner as in Reference Example 1, the main chemical structure part has a value of a number average molecular weight (Mn) of about 1500 with respect to one polyester main chain after production. A side chain forming agent was added and copolymerized so that five side chains of polyethylene oxide-polyethylene copolymer type were formed, and then Reference Example 1
Polymerization was terminated by adjusting the conditions so that the main chain of the polyester has the same average molecular weight as the polyester obtained by the above method, and a copolyester was obtained.

Polyester POY was obtained by the same method as in Reference Example 2. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 2 shows the strength, elongation, and Δn of this POY.
Shown in. The elongation was 175%, and Δn was 36 × 10 ⁻³ , and the orientation was largely suppressed as compared with Δn of POY shown in Reference Example 2.

The polyester POY thus obtained was stretched in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was 1.8 times as large as that of Reference Example 2.

Compared with Examples 7 and 8, by optimizing the number of branches (side chain sites) per polyester main chain, the process passability was improved and a polyester POY having a large elongation was obtained. Obtained and with a larger draw ratio,
A drawn yarn having no strength reduction was obtained, and the productivity was further improved.

Example 10 When a polycondensation reaction was carried out in the same manner as in Reference Example 1, the main chemical structure portion had a value of a number average molecular weight (Mn) of about 2000 with respect to 450 polyester main chains after formation. A side chain forming agent is added and copolymerized so that one side chain of polyethylene oxide-polyethylene copolymer type is formed, and a polyester main chain having the same average molecular weight as the polyester obtained by the method of Reference Example 1 is obtained. The polymerization was stopped by adjusting the conditions as described above to obtain a copolyester.

Polyester POY was obtained by the same method as in Reference Example 2. No yarn breakage occurred during spinning, and the spinnability was excellent. Table 2 shows the strength, elongation, and Δn of this POY.
Shown in. The elongation was 180%, and Δn was 33 × 10 ⁻³ , and the orientation was largely suppressed as compared with Δn of POY shown in Reference Example 2.

The obtained polyester POY was stretched in the same manner as in Reference Example 1. No yarn breakage occurred during drawing, no fluff was found on the wound yarn, and the drawability and process passability were excellent. Table 2 shows the strength, elongation and draw ratio of this drawn yarn. The draw ratio was 1.9 times as large as that of Reference Example 2.

As in Example 9, as compared with Examples 7 and 8, by optimizing the number of branches (side chain sites) per polyester main chain, process passability was improved and A polyester POY having an elongation was obtained, and a stretched yarn with no reduction in strength was obtained at a larger draw ratio, and the productivity was further improved.

[0086]

INDUSTRIAL APPLICABILITY The polyester partially oriented undrawn yarn of the present invention has suppressed orientation, and can achieve improvement in productivity per unit time, yarn-forming property, process passability, drawing and draw ratio during drawing false twisting. That is, it has very favorable characteristics in production. Further, the polyester of the present invention can be obtained by a very simple method in which a compound having a specific structure is copolymerized as a side chain site and the compound is collected at a specific collection rate.

Continued front page    F-term (reference) 4J029 AA04 AB01 AC05 AE02 BA03                       BA05 BA08 BA10 BD07A                       CA02 CA06 CB05A CB06A                       CB10A CC06A CD03 CH03                       CH06 DC08 JE042 JE052                       JE182                 4L035 BB33 BB34 BB77 BB89 BB91                       EE08 EE20 GG01 HH01 HH10

Claims (3)

[Claims] 1. A polyester partially oriented undrawn yarn having a birefringence of 0.020 or more and less than 0.060, which is made of polyester having a side chain having a structure satisfying the following conditions (i) and (ii). (I) The average molecular weight (M) of the side chain part is 100 to 1000.
0. (Ii) The chemical structure of the side chain portion is a structure which is substantially non-reactive in the production of polyester. 2. The average molecular weight X of the polyester main chain and the number A of side chains per polyester main chain are represented by the following formulas (1) and (2). 1. The polyester partially oriented undrawn yarn according to 1. B / 500 ≦ A ≦ 10B (1) B = X / 20000 (2) 3. The chemical structure of the side chain portion is at least one of polyalkylene oxide or its derivative, vinyl addition polymerization type polymer or its derivative, copolymer having alkylene oxide and vinyl group as a repeating unit or its derivative. 3. The polyester partially oriented undrawn yarn according to claim 1, wherein the partially oriented polyester yarn is composed of a seed.