JP2002069751A - Polyester monofilament and its use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester monofilament improved in hydrolytic resistance and life under high temperature and high humidity and an industrial woven fabric typified by papermaking drier canvas using its monofilament. SOLUTION: This polyester monofilament is characterized in that the monofilament comprises >=80 wt.% saturated polyester (A) containing 0.2-15 wt.% styrene-2-isopropenyl-2-oxazoline random copolymer (B) and >=0.02 wt.% unreacted monocarbodiimide compound and the terminal carboxyl group concentration is <=7 equivalent based on 106 g of the monofilament.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an industrial product represented by a saturated polyester monofilament having good hydrolysis resistance useful as a constituent material of various industrial fabrics, and a papermaking dryer canvas using at least a part of the monofilament. It is related to woven fabrics.

[0002]

2. Description of the Related Art Polyester monofilaments, which have excellent tensile strength and dimensional stability, have been widely used as constituent materials of various industrial materials. However, polyester monofilaments are used under conditions that are easily hydrolyzed such as high temperature and high humidity.For example, when used as a constituent material of a papermaking dryer canvas, they are used for a long time under high temperature and high humidity. Monofilaments cause strength reduction due to hydrolysis degradation,
In some cases, it could not be used.

[0003] The hydrolysis of polyester under high temperature and high humidity is accelerated by the catalytic action of the carboxyl end group possessed by the polyester itself and the carboxyl end group generated by hydrolysis of the polyester. Various attempts have been made to activate polyester monofilaments and extend the life of products using the monofilaments.

For example, a method has been proposed in which a carboxyl terminal group of a polyester is inactivated by adding a carbodiimide compound (Japanese Patent Publication No. 1-15604, Japanese Patent Application Laid-Open No. 4-289221).

Japanese Patent Application Laid-Open No. Hei 7-258524 proposes a method of further suppressing the hydrolysis of a polyester composition and a monofilament by adding a polyolefin, a polycyclic olefin, polystyrene and the like together with a carbodiimide compound.

However, the use conditions of a papermaking dryer canvas, which is a main use of polyester monofilaments, have become increasingly severe with the speeding up of papermaking, and further improvements in the hydrolysis resistance of polyester monofilaments have been required. .

[0007]

DISCLOSURE OF THE INVENTION The present invention is typified by a polyester monofilament having improved hydrolysis resistance and an improved life under high temperature and high humidity conditions and a papermaking dryer canvas using the monofilament. An industrial fabric is provided.

[0008]

Means for Solving the Problems The present inventors diligently studied to solve the above-mentioned problems, and found that the problems could be solved by applying a specific copolymer to a polyester monofilament, and reached the present invention. The object of the present invention is solved by the following means. 1. 80% by weight of a saturated polyester (A) containing 0.2 to 15% by weight of a styrene / 2-isopropenyl-2-oxazoline random copolymer (B) and 0.02% by weight or more of an unreacted monocarbodiimide compound (C) % Of carboxyl groups at a terminal carboxyl group concentration of not more than 7 equivalents per 10 ⁶ g of the monofilament, and a paper-making dryer canvas using at least a part of the polyester monofilament. fabric. 2. The saturated polyester (A) constituting the polyester monofilament comprises at least one polymer (D) selected from polyolefin (d1) and polystyrene (d2) in an amount of 0.1 to 15% by weight, and / or an aromatic polymer. 0.1 to 3.0 of the carbodiimide compound (E)
An industrial fabric typified by a polyester monofilament characterized by containing by weight and a paper dryer canvas using at least a part of the polyester monofilament.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The polyester in the saturated polyester (A) constituting the polyester monofilament of the present invention is a polyester comprising a dicarboxylic acid and a glycol. Examples of the dicarboxylic acid component include terephthalic acid, 2,6-naphthalenedicarboxylic acid, isophthalic acid, and 1,4-cyclohexanedicarboxylic acid. Examples of the glycol component include ethylene glycol, propylene glycol, tetramethylene glycol, 1,4-cyclohexanedimethanol, and the like. Part or all of the above dicarboxylic acid component may be replaced with adipic acid, sebacic acid, dimer acid, sulfonic acid metal salt-substituted isophthalic acid, or the like, and part of the above glycol component may be diethylene glycol, neopentyl glycol. , 1,4-cyclohexanediol,
It may be replaced with a polyalkylene glycol or the like. Furthermore, pentaerythritol, trimethylolpropane,
A small amount of a chain branching agent such as trimellitic acid, trimesic acid and boric acid can be used in combination. Also, polycondensation polymers of hydroxycarboxylic acids such as polylactic acid can be used. Among them, polyethylene terephthalate (hereinafter referred to as PET), in which 90 mol% or more of the dicarboxylic acid component is composed of terephthalic acid and 90 mol% of the glycol component is composed of ethylene glycol, is preferred.

The polyester includes particles such as various inorganic particles such as titanium oxide, silicon oxide, calcium carbonate, silicon nitride, clay, talc, kaolin and zirconate, crosslinked polymer particles, various metal particles, and the like. Conventionally known antioxidants, sequestering agents, ion exchange agents, anti-coloring agents, light-fast agents, inclusion compounds, antistatic agents, various coloring agents, waxes, silicone oil, various surfactants,
Various reinforcing fibers and the like may be added.

The intrinsic viscosity of the polyester is usually 0.1.
It is sufficient if it is 6 or more, and more preferably 0.7 or more. Here, the limiting viscosity is 2 in orthochlorophenol solution.
It is the intrinsic viscosity obtained from the viscosity measured at 5 ° C. and is represented by [η] (hereinafter abbreviated as [η]).

The polyester is obtained by polycondensing a monomer or prepolymer obtained by a known transesterification method or a method such as an esterification method in a molten state or in a solution. It can be obtained by increasing the degree of polymerization.

As the polyester, the carboxyl end group concentration before melt spinning is 20 per 10 ⁶ g of the polyester.
Equivalent (hereinafter, eq / PE10 ⁶ g) There is preferably used abbreviated) following as the further preferable to use the following 15eq / PE10 ⁶ g.

The quantitative analysis of the terminal carboxyl group concentration of the polyester is performed by dissolving a precisely weighed polyester sample in an o-cresol (water content: 5%) adjusting solution, adding an appropriate amount of dichloromethane to the solution, and adding 0.02 N KOH. It was measured by titration with a methanol solution.

The saturated polyester (A) contained in the polyester monofilament of the present invention is a styrene-2-isopropenyl-2-oxazoline random copolymer (B) (hereinafter referred to as polymer (B)) of 0.2 to 15%. % By weight, and the content of the polymer (B) is 0.1%.
More preferably, it is 5 to 13% by weight. When the content of the polymer (B) is less than 0.2% by weight, the hydrolysis resistance is insufficient, and when it is more than 15% by weight, the strength of the monofilament becomes insufficient.

Styrene-2-isopropenyl-2-oxazoline random copolymer (B) which is the polymer (B)
Is 90-98% by weight of styrene and 2-isopropenyl-
2-oxazoline is a random copolymer with 10 to 2% by weight, and the copolymerization ratio is 93 to 97% by weight of styrene and 2
-Isopropenyl-2-oxazoline tends to be more preferably 7 to 3% by weight.

The above-mentioned polymer (B) is commercially available as "Epocross" (registered trademark) RPS (Nippon Shokubai Co., Ltd.).
Products) are known and can be used for purchase.

The monofilament of the present invention contains the unreacted monocarbodiimide compound (C) in an amount of 0.02% by weight or more, and more preferably 0.05% by weight or more. When the content of the monocarbodiimide compound (C) is less than 0.02% by weight, the hydrolysis resistance becomes insufficient.

The monocarbodiimide compounds (hereinafter abbreviated as MCD compounds) which can be used in the present invention include, for example, N, N'-di-2,6-diisopropylphenylcarbodiimide, N, N'-di-2 , 6-di-te
rt-butylphenylcarbodiimide, N, N'-di-
2,6-diethylphenylcarbodiimide, N, N'-
Di-2-ethyl-6-isopropylphenylcarbodiimide, N, N'-di-2-isobutyl-6-isopropylphenylcarbodiimide, N, N'-di-2,4,6
-Trimethylphenylcarbodiimide, N, N'-di-
2,4,6-triisopropylphenylcarbodiimide, N, N'-di-2,4,6-triisobutylphenylcarbodiimide and the like. Further, one or more compounds may be arbitrarily selected from these MCD compounds to block the carboxyl terminus of the aliphatic polyester, but the heat resistance and reactivity and the affinity with the aliphatic polyester may be improved. In view of the above, N, N'-di-2,6-diisopropylphenylcarbodiimide (hereinafter abbreviated as TIC) is preferable, and TIC is a commercially available Rhein-C
“STABAXOL” ® I or Rasch from hemie
"Stabilizer" (registered trademark) 7000 manufactured by ig AG or the like can be used.

The quantitative analysis of the unreacted MCD compound contained in the monofilament of the present invention was carried out by the following method.

(1) Approximately 2 samples were placed in a 100 ml volumetric flask.
Weigh out 00 mg.

(2) Hexafluoroisopropanol /
2 ml of chloroform (volume ratio 1/1) is added to dissolve the sample.

(3) When the sample is dissolved, chloroform 8
Add ml.

(4) Acetonitrile / chloroform (volume ratio 9/1) was gradually added to precipitate the polymer while precipitating the polymer.
Make it 0 ml.

(5) The sample solution is filtered through a 0.45 μm disk filter and quantitatively analyzed by high performance liquid chromatography. The high-performance liquid chromatography analysis conditions are as follows.

Column: Inertsil ODS-2
4.6 mm × 250 mm Mobile phase: acetonitrile / water (volume ratio 94/6) Flow rate: 1.5 ml / min Sample quantity: 20 μl Detector: UV (280 nm).

The polyester monofilament of the present invention has a terminal carboxyl group concentration of 7 equivalents per 10 ⁶ g of the monofilament (hereinafter abbreviated as eq / MF10 ⁶ g), and more preferably 4 equivalents or less. When the terminal carboxyl group concentration is more than 7 eq / MF10 ⁶ g, the hydrolysis resistance becomes insufficient.

In the quantitative analysis of the terminal carboxyl group concentration described above, a precisely weighed monofilament sample was dissolved in o-cresol (water 5%) adjusting solution, and an appropriate amount of dichloromethane was added to the solution, and then 0.02 N KOH was added. It was measured by titration with a methanol solution.

For the monofilament having a terminal carboxyl group concentration of 7 eq / MF10 ⁶ g or less, a known compound such as oxazolines and carbodiimides which undergo an addition reaction with the carboxyl terminal group of the polyester during the production of the monofilament of the present invention is added and melt-kneaded. Can be obtained by
Since the monofilament of the present invention contains the unreacted MCD compound (C) in a specific amount, it is preferable to use the above-mentioned MCD compound.

The saturated polyester (A) constituting the polyester monofilament of the present invention is at least one polymer (D) selected from polyolefin (d1) or polystyrene (d2) (hereinafter abbreviated as polymer (D)). From 0.1 to 15% by weight, more preferably from 0.5 to 15% by weight.
When the content is 12% by weight, the hydrolysis resistance is further improved, which is preferable. When the content of the polymer (D) is less than 0.1% by weight, the effect of improving the hydrolysis resistance is insufficient, and when it is more than 15% by weight, the strength of the monofilament becomes insufficient.

The polyolefin (d1), which is a kind of the polymer (D), is a polymer different from the polymer (B), and is, for example, polyethylene, polypropylene, poly-1-methylpentene-2, Ring-opened polymers of cyclic olefins such as cyclododecene and hydrogenated products of the polymers, copolymers of cyclic olefins such as tetracyclododecene and α-olefins such as ethylene, and hydrogenated products of the polymers And one or more of these can be selected and used. As these polyolefins (d1), polymers widely commercially available from domestic and foreign companies can be used, and the cyclic olefin (co) polymer is, for example, "Apel" (registered trademark) (product of Mitsui Chemicals, Inc.) , "ZEONEX" (registered trademark) (product of ZEON Corporation) and "ZEONOR" (registered trademark) (product of ZEON Corporation), etc., which can be purchased and used.

The polystyrene (d2), which is a kind of the above-mentioned polymer (D), is a polymer different from the above-mentioned polymer (B), and includes polystyrene having an atactic structure, polystyrene having an isotactic structure, and syndiotactic. Polystyrene having a tick structure can be used, and a small amount of α-methylstyrene may be copolymerized mainly with styrene. Among them, polystyrene having a syndiotactic structure is particularly preferable.

For these polystyrenes (d2), polymers widely available from various companies in Japan and overseas can be used, and polystyrene having a syndiotactic structure is commercially available as "Zalek" (registered trademark) (Idemitsu Petrochemical Co., Ltd.). Products) are known and can be used.

When the polyester (A) in the present invention contains the aromatic polycarbodiimide compound (E) in an amount of from 0.1 to 3.0% by weight, more preferably from 0.15 to 1.5% by weight, it is resistant to hydrolysis. It is preferable because the decomposability is further improved. When the amount of the aromatic polycarbodiimide compound (E) is less than 0.1% by weight, the effect of improving the hydrolysis resistance is insufficient. When the amount is more than 3.0% by weight, the melt viscosity of the polyester increases and normal melt spinning is performed. It becomes difficult.

The aromatic polycarbodiimide compound (E) in the present invention refers to an aromatic compound containing a plurality of carbodiimide groups in one molecule, for example, 1,3,5-
Polycarbodiimide synthesized from tris (1-methylethyl) -2,4-diisocyanatobenzene, 2,6-diisopropylbenzene-1,4-diisocyanate (or 2,6-
Polycarbodiimide synthesized from diisopropylbenzene-1,3-diisocyanate), polycarbodiimide synthesized from 1,3,5-tris (isopropyl) -2,4-diisocyanatobenzene, 1,3,5-tris ( Synthesized from a mixture of 1-methylethyl) -2,4-diisocyanatobenzene and 2,6-diisopropylbenzene-1,4-diisocyanate (or 2,6-diisopropylbenzene-1,3-diisocyanate) Polycarbodiimide, 1,3,5-tris (1-methylethyl) -2,4-diisocyanatobenzene and 1,
Polycarbodiimide synthesized from a mixture with 3,5-tris (isopropyl) -2,4-diisocyanatobenzene and 2,6-diisopropylbenzene-1,4-diisocyanate (or 2,6-diisopropylbenzene-1) , 3-diisocyanate) and polycarbodiimide synthesized from a mixture of 1,3,5-tris (isopropyl) -2,4-diisocyanatobenzene, but are not limited thereto. Absent. Further, the aromatic polycarbodiimide compound may have an isocyanate group at a molecular terminal.

Among these aromatic polycarbodiimide compounds, polycarbodiimide synthesized from 1,3,5-tris (isopropyl) -2,4-diisocyanatobenzene,
Polycarbodiimides synthesized from 1,3,5-tris (1-methylethyl) -2,4-diisocyanatobenzene and 1,3,5-
A mixture of 5-tris (1-methylethyl) -2,4-diisocyanatobenzene and 2,6-diisopropylbenzene-1,4-diisocyanate (or 2,6-diisopropylbenzene-1,3-diisocyanate) Is particularly preferable, and the average molecular weight of the polycarbodiimide compound is from 2,000 to 16,000, preferably from 2,500 to 1
Those having an average molecular weight of 2,000 are mentioned.

The aromatic polycarbodiimide compound (hereinafter, referred to as
PCD compound) is commercially available and has an average molecular weight of
3,000 "STABAXOL" (registered trademark) P (manufactured by Bayer AG), average molecular weight 10,000 "STABAXOL" (registered trademark) P
100 (a product of Bayer) and "STABILIZER" 9000 (a product of Raschig) are available.

The PCD compound can be added as a masterbatch. The PCD compound masterbatch is commercially available as “STAB having an average molecular weight of 10,000 in PET.
"ST containing AXOL" (registered trademark) P100 at 15% by weight.
ABAXOL® (registered trademark) KE7646 (manufactured by Bayer), also “STABAXOL” (registered trademark) KE9291 (manufactured by Bayer)
And "STABAXOL" (registered trademark) P having an average molecular weight of 3,000
"STABAXOL" (registered trademark) KE8059 (manufactured by Bayer AG) and "STABILIZER" containing 8% by weight and 7% by weight of "STABAXOL" (registered trademark) P100 having an average molecular weight of 10,000.
"STABILIZER" containing 15% by weight of (registered trademark) 9000
(Registered trademark) 9000 MB (a product of Raschig) or the like can be obtained.

The content of the saturated polyester (A) in the monofilament of the present invention can be arbitrarily designed.
It is preferred that the content be not less than% by weight.

The production of the polyester monofilament of the present invention can be carried out by employing the following method. However, it is not limited to this.

For example, a saturated polyester and a polymer (B) dried by a conventional method, and if necessary, a polymer (D),
The PCD compound (E) is weighed or pre-measured and mixed in advance and fed to a single- or twin-screw extruder equipped with a spinning head at the tip, and at the same time, the melted MCD compound is weighed while the extruder kneading section inlet After mixing and melt-kneading from before the spinning head to the spinning head, the mixture is weighed with a gear pump, melt-spun from a spinneret through a filtration layer, stretched and heat-set as necessary, and wound up. Will be

In the production of the polyester monofilament, it is preferable that the polymer (B) and the polymer (D) are melt-kneaded in advance in the form of pellets. Further, the polyester and the polymer (B) or the pellets are preferably used. It is also preferable to use pellets produced by melt-kneading polyester, polymer (B) and polymer (D) in advance.

The amount of the MCD compound added is the sum of the carboxyl terminal group concentration of the polyester used, the carboxyl terminal group concentration generated in the step of melt kneading the polyester during spinning, and the amount of unreacted MCD compound contained in the polyester monofilament. Determined in consideration of the amount.

The polyester monofilament of the present invention is a continuous yarn composed of one single yarn. The cross-sectional shape of the polyester monofilament of the present invention may be any, for example, round, oval, triangular, T, Y, H, +, 5 leaves, 6
Multi-leaf shapes such as leaves, 7 leaves and 8 leaves, squares, rectangles, rhombuses, cocoons, horseshoe, dog bones, etc., and even if these shapes are partially modified Good. In use, the filaments having various cross-sectional shapes can be appropriately combined and used. The required strength of the yarn varies depending on the application, but is preferably about 3.2 cN / dtex or more.

The thickness of the polyester monofilament of the present invention is 2
Defined by the length of the line segment between the sides, a range of 0.1 to 4.0 mm is preferable.

The polyester monofilaments of the present invention may be selected from various inorganic particles such as titanium oxide, silicon oxide, calcium carbonate, silicon nitride, clay, talc, kaolin, zirconate, crosslinked polymer particles, various metal particles, etc. In addition to the above-mentioned particles, conventionally known antioxidants, sequestering agents, ion exchangers, anti-coloring agents, light-fast agents, inclusion compounds, antistatic agents, various coloring agents, waxes, silicone oil, various interfaces In addition to activators, various reinforcing fibers, etc., ethylene / tetrafluoroethylene copolymer, polyvinylidene fluoride, terpolymer of ethylene tetrafluoride / propylene hexafluoride / vinylidene fluoride and polytetrafluoroethylene Such as fluororesins, polyphenylene sulfides, polyamides, ethylene-glycidyl methacrylate copolymer, ethylene Rate copolymer may contain polyacrylates such as methyl methacrylate polymer, various rubbers, ionomers, and the like polymers such as polyurethanes and other thermoplastic elastomers.

The polyester monofilament of the present invention thus obtained is superior in hydrolysis resistance to the conventional one, and is used for a paper machine such as a dryer canvas, a press felt base fabric and a wire, a filter, a conveyor belt and the like. It is suitable as a constituent material of various industrial fabrics, and particularly as a constituent material of a paper dryer canvas requiring excellent hydrolysis resistance.

The industrial fabric of the present invention is obtained by weaving at least a part of the weft and / or warp constituting the fabric using the above-mentioned polyester monofilament of the present invention.

The weaving method of this industrial woven fabric can be appropriately selected depending on the application, for example, plain weaving, twill weaving,
Known weaving methods such as heavy weaving and triple weaving can be employed.

Specific examples of the industrial fabric referred to in the present invention include a papermaking drier canvas, a papermaking wire, a filter, a conveyor belt, and a screen gauze. Can be obtained.

Hereinafter, the present invention will be described in more detail with reference to Examples.

[0053]

EXAMPLES The evaluation of hydrolysis resistance of monofilaments in the following examples was carried out using a saturated super-accelerated life tester PC-305SIII manufactured by Hirayama Seisakusho Co., Ltd.
It carried out by the method of calculating | requiring the carboxyl terminal group density | concentration of the monofilament hydrolyzed at 5 degreeC for 18 hours.
Polyester molecules have the property that the carboxyl end group concentration increases with the progress of the hydrolysis reaction.The lower the carboxyl end group concentration after the hydrolysis treatment, the better the hydrolysis resistance, and the higher the temperature and the higher the humidity, Indicates that it can be used for a long time. Reference Example 1 (Production of PET) 100 parts by weight of dimethyl terephthalate, 80 parts by weight of ethylene glycol, 0.05 parts by weight of manganese acetate, and 0.0 part of antimony trioxide
Charge 3 parts by weight into a reaction vessel, and stir at 130 ° C to 230 ° C.
After the methanol was allowed to flow out while the temperature was raised to cause a transesterification reaction, 0.0035 parts by weight of an 85% aqueous phosphoric acid solution was added, and the mixture was heated at 235 ° C. for 30 minutes under normal pressure to distill off excess ethylene glycol. The resulting low polymer was heated to 235 to 285 ° C. and subjected to polycondensation under reduced pressure to obtain [η] 0.70, terminal carboxyl group concentration 16
eq / PE10 ⁶ g of PET was obtained.

The polymer is about 3 mm in diameter and about 4 mm in length.
After chipping into chips of a size of mm, using a rotary, decompression and heating solid phase polymerization apparatus, 235 ° C. for 10 hours, degree of vacuum 133 Pa
Solid-state polymerization was performed as follows to obtain a solid-state polymerized PET chip having [η] = 0.94 and a terminal carboxyl group concentration of 10 eq / PE10 ⁶ g. [Examples 1 to 15, Comparative Examples 1 and 2] The solid-phase polymerized PET chip obtained in Reference Example 1 which is a polyester (A), and "Epocross" (registered trademark) RPS-1005 which is a polymer (B)
(Product of Nippon Shokubai Co., Ltd.), polyethylene (hereinafter referred to as PE) which is a polymer (C) or "Zarek" (hereinafter referred to as SP) which is a polystyrene having a syndiotactic structure.
S), TIC which is an MCD compound (E) (“Stab
ilizer "7000 (a product of Raschig AG)" and "STABAXOL" P-100 which is a PCD compound (D) (hereinafter referred to as P100
Are melt-kneaded and spun at 285 ° C. using an extruder-type spinning machine while being weighed at the ratios shown in Table 1, cooled in a 70 ° C. hot water bath, stretched and heat-set to obtain a diameter of 0.40 mm. A polyester monofilament having a circular cross section and having a terminal carboxyl group concentration (hereinafter referred to as a COOH group concentration) having a concentration shown in Table 1 was obtained. Composition of each monofilament and CO after hydrolysis
Table 1 also shows the OH group concentration.

[0055]

[Table 1] [Examples 16 to 21, Comparative Example 3]
The polyester monofilaments obtained in 9, 11, 13, 14 and Comparative Example 1 were used for warp and weft to prepare seven types of twill canvas for paper dryers. This canvas was attached to the dryer of a neutral paper machine,
After use for drying the paper at 4 ° C. for 4 months, the canvas was removed. Table 1 also shows the remaining strength of the warp of this canvas.

[0056]

[Table 2]

[0057]

The polyester monofilament of the present invention has better hydrolysis resistance than the conventional one.
Dryer canvas, fabric for paper machine such as press felt base fabric and wire, and filter, suitable as a constituent material of various industrial fabrics such as conveyor belts, especially papermaking dryer canvas which requires excellent hydrolysis resistance It is suitable as a constituent material.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuhei Maeda 4845 Mishima-shi, Shizuoka Toray Industries, Inc. Mishima Plant (72) Inventor Shoji Aono 4845 Mishima-shi, Shizuoka Prefecture Toshima Inc. Mishima Plant (72) Inventor Akira Kinoshita 1 Kawara, Showa-cho, Okazaki City, Aichi Prefecture Toray Monofilament Co., Ltd. (72) Inventor Takayuki Yamagami 1 Kawahara, Showa-cho, Okazaki City, Aichi Prefecture Tomo Monofilament Co., Ltd. F-term (reference) 4L035 BB32 BB57 DD14 FF01 HH10 4L048 AA21 AA46 AA56 AB10 AC16 BA06 BB01 CA08 DA37 DA39 4L055 CF30 FA30

Claims (8)

[Claims] 1. A styrene / 2-isopropenyl-2-oxazoline random copolymer (B) in an amount of 0.2 to 15% by weight and an unreacted monocarbodiimide compound (C) in an amount of 0.0
A polyester monofilament comprising 80% by weight or more of saturated polyester (A) containing 2% by weight or more and having a terminal carboxyl group concentration of 7 equivalents or less per 10 ⁶ g of the monofilament. 2. The method according to claim 1, wherein the saturated polyester (A) constituting the polyester monofilament is a polyolefin (d1).
Or at least one selected from polystyrene (d2)
2. Polyester monofilament according to claim 1, which contains from 0.1 to 15% by weight of the polymer (D). 3. The saturated polyester (A) constituting the polyester monofilament contains the aromatic polycarbodiimide compound (E) in an amount of 0.1 to 3.0% by weight. The polyester monofilament according to any one of the above. 4. The polyester monofilament according to claim 1, wherein the saturated polyester in the saturated polyester (A) constituting the polyester monofilament is polyethylene terephthalate. 5. The monocarbodiimide compound (C) is
The polyester monofilament according to any one of claims 1 to 4, which is N, N'-di-2,6-diisopropylphenylcarbodiimide. 6. An aromatic polycarbodiimide compound (E)
Is a polycarbodiimide synthesized from 1,3,5-tris (isopropyl) -2,4-diisocyanatobenzene, 1,3,5-
Polycarbodiimide synthesized from tris (1-methylethyl) -2,4-diisocyanatobenzene and 1,3,5-tris (1-methylethyl) -2,4-diisocyanatobenzene
It is at least one selected from polycarbodiimides synthesized from a mixture with 2,6-diisopropylbenzene-1,4-diisocyanate (or 2,6-diisopropylbenzene-1,3-diisocyanate). The polyester monofilament according to any one of claims 1 to 5. 7. An industrial fabric using the polyester monofilament according to claim 1 for at least a part of a warp or a weft. 8. The industrial fabric according to claim 7, wherein the industrial fabric is a papermaking dryer canvas.