JP2001072842A - Polyester composition and polyester film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film excellent in heat resistance and tenacity, on the other hand moldable by a relatively simple molding process, having constant slipperiness at low temperatures to high temperatures, and stably handleable. SOLUTION: The polyester composition characterized in that it comprises a polyester having a glass transition temperature (Tg) of 20-85 deg.C determined by dynamic viscoelastic method, and fine particles of synthetic zeolite or crosslinked silicone, and the concentration of the fine particles is 0.01-1.0 wt.% based on the total composition. A polyester film made of the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester composition comprising a polyester and a specific slipperiness improver, and a monolayer or multilayer film comprising the same. Specifically, a polyester system, which is usually extremely excellent in surface gloss and transparency, is inferior in slipperiness and has a drawback in that it has a problem in suitability for film processing. Therefore, the present invention relates to a polyester composition in which the slipperiness of a polyester film is improved and the suitability for film processing is improved, and a polyester film using the composition.

[0002]

2. Description of the Related Art Polyester is widely used in the field of films and bottles. In particular, polyethylene terephthalate (PET) is produced and consumed worldwide as a biaxially stretched film. PET films exhibit excellent transparency, toughness, and heat resistance, but do not exhibit strength and are inferior in toughness unless biaxially stretched. Therefore, in order to obtain physical properties that can withstand actual use as a film, a stretching step is indispensable, requiring a large amount of initial capital investment, and the equipment is large, so the versatility is low, and it is suitable for mass small-scale production. However, there are also points that are not suitable for small-quantity multi-product production. Furthermore, due to the characteristics of PET, production by the inflation method is not usually performed, and heat sealing cannot be performed directly. Therefore, in order to use it as a bag-like packaging material, it is necessary to form a sealant layer by laminating, etc. There is also a problem that a post-process is required to perform the process.

On the other hand, polyamide films are used in large quantities as films exhibiting toughness and transparency. Polyamide expresses toughness without biaxial stretching and can be produced by the inflation method.
Suitable for bag packaging materials. However, the slipperiness is extremely reduced in a high-humidity environment, and the workability changes depending on the season.In addition, for foods that use a large amount of water, such as konjac and Shirataki, the film running performance often decreases significantly in the packaging process. Was causing trouble.

In the field where such slipperiness is a problem, there is a case where so-called "powder shaking" is performed for spraying fine particles of starch treated with silicone for the purpose of improving slipperiness. Since it is starch, mold is generated, and if it is kept in a high-temperature and high-humidity environment for a long time, blocking of the film surface may be induced, which has been regarded as a problem by film users.

[0005] For the purpose of improving the slipperiness of polybutylene terephthalate (PBT), it has been proposed to use crosslinked organic fine particles as an antiblocking improver (see JP-A-11-77937). However, the crosslinked organic fine particles are decomposed at the time of molding to generate an unpleasant odor, and the odor may remain on the film. In addition, under an environment of relatively high humidity applied to actual fresh food or processed meat packaging, it is easily expected that there is a problem in properties as a packaging film.

As described above, a film which is excellent in heat resistance and toughness, formed by a relatively simple forming method, does not change its slipperiness from low humidity to high humidity, and can be used stably at present is known. Not obtained. Biaxially stretched PE
Numerous improvements have been studied in the past for T films and polyamide films, and moderate effects have been observed, but PBT whose main component is butanediol among the diol components has hardly been studied. The situation.

[0007]

Further, the PBT has a P
As compared with ET, although the heat resistance is slightly inferior, the film obtained without any particular stretching has toughness, and can be formed by a relatively simple method such as an inflation method. It is possible to simplify the production process and easily obtain a tubular film excellent in suitability for bag packaging material.
However, the PBT film has extremely poor slipperiness, and easily runs wrinkles when the film runs in a molding machine,
Loud squeaking noise was generated, and there was a problem in the working environment.
In addition, even in the completed bag making process of the film, the bags could not be aligned while being stacked, and there were many problems in the bag shipping operation.

[0008]

The inventors of the present invention have made intensive studies to develop a polyester composition for a film having excellent slipperiness. As a result, the inventors have found that a specific polyester and a fine particle of synthetic zeolite or cross-linked silicone are used. By the combination, it is possible to surprisingly improve the slipperiness, and to obtain a film having high transparency, furthermore, the effect is further enhanced by the combination of a specific higher fatty acid derivative,
In particular, the present inventors have found that the improvement of the slip property also improves the slip property under a high humidity environment, which has been a problem with the conventional polyamide film, and the like, and have led to the present invention.

That is, the gist of the present invention is to contain fine particles of polyester and synthetic zeolite or crosslinked silicone having a glass transition temperature (Tg) of 20 ° C. to 85 ° C. measured by the dynamic viscoelasticity method, Composition basis) is 0.
The present invention relates to a polyester composition characterized in that the content is from 0.01% by weight to 1.0% by weight, and a film comprising the composition.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. Polyester The polyester used in the present invention needs to have a glass transition temperature Tg measured by a dynamic viscoelasticity method in a range of 20 ° C to 85 ° C. That is, if the Tg is lower than 20 ° C., the resulting film is inferior in transparency, causing a problem in suitability as a packaging material. When Tg exceeds 85 ° C., the toughness in an unstretched state is low, and the elongation in a low-temperature environment is particularly low. Therefore, there is a problem in packaging of processed meat or the like for which low-temperature storage is desired.

In the present specification, T by dynamic viscoelasticity method
g is measured by measuring Tg as the temperature at which Tan δ shows the maximum value.
Is the measurement. Specifically, it is performed by collecting dynamic viscoelasticity data by an appropriate measuring device and calculating Tg by analyzing the collected data. In practice, this can easily be done using a commercially available automatic dynamic viscoelasticity measurement device suitable for this purpose. Here, the dynamic viscoelasticity data was collected using a sample cut from a film under the conditions of a measurement frequency of 110 Hz, a heating rate of 2 ° C./min, and a data sampling interval of 2 ° C.

The dicarboxylic acid component of the polyester used in the present invention (more precisely, it is a divalent dicarboxylic acid residue lacking two OHs, but is abbreviated as such for convenience. The same applies to the following specific examples). ) Includes terephthalic acid,
Isophthalic acid, 2,6-dinaphthalenedicarboxylic acid,
1,5-dinaphthalenedicarboxylic acid, bis (4,4'-
(Carboxyphenyl) methane, an aromatic dicarboxylic acid such as anthracene dicarboxylic acid, 4,4'-diphenyl ether carboxylic acid, an alicyclic dicarboxylic acid such as 1,4-cyclohexane dicarboxylic acid, 4,4'-dicyclohexyl dicarboxylic acid, and adipic acid And aliphatic carboxylic acids such as sebacic acid, azelaic acid and dimer acid. The proportion of the aromatic dicarboxylic acid in the dicarboxylic acid component, preferably the proportion of terephthalic acid and / or isophthalic acid, is determined from the viewpoint of mechanical properties, gas barrier properties, and heat resistance temperature.
It is preferably at least 70 mol%, more preferably 9 mol%.
0 mol% or more.

The diol component used in the present invention (this is also a divalent diol residue lacking two Hs, but is abbreviated as such for convenience. The same applies to the following specific examples) Is mainly composed of tetramethylene glycol. The proportion of tetramethylene glycol in the diol component is preferably 70 to 100 mol%, and more preferably 90 to 100 mol%. Examples of the diol component other than tetramethylene glycol include aliphatic or alicyclic diols having 2 to 20 carbon atoms and bisphenol derivatives. Specific examples include ethylene glycol, propylene glycol, 1,5-pentadiol, Examples thereof include 6-hexanediol, neopentyl glycol, decamethylene glycol, cyclohexanedimethanol, 4,4′-dicyclohexylhydroxypropane, ethylene oxide addition diol of bisphenol A, and a mixture thereof. If necessary, a triol component such as glycerin or trimethylolpropane may be used instead of a part of these diol components.

The polyester used in the present invention preferably comprises a dicarboxylic acid component containing terephthalic acid and / or an ester derivative thereof as a main component and a diol component containing tetramethylene glycol as a main component. In each case, the Tg measured by the dynamic viscoelasticity method described above was 2
It is necessary to select the type and amount of the comonomer so as to fall within the range of 0 ° C to 85 ° C.

Fine particles of synthetic zeolite or crosslinked silicone
In the present invention, the selection of fine particles of synthetic zeolite or cross-linked silicone means that the transparency of the film can be maintained together with the effect of improving the slipperiness, and that it does not decompose itself during molding to generate toxic components and off-flavor components. It depends on the effect. The type of fine particles of synthetic zeolite or crosslinked silicone used in the present invention can be arbitrarily selected from commercial products. The reason for selecting a synthetic zeolite instead of a natural zeolite and selecting a crosslinked silicone which is an already crosslinked product of silicone rubber is that fine particles having a uniform particle size are easily available. Among the synthetic zeolites, especially the composition and skeleton are exactly the same as ordinary synthetic zeolites, but an inert treatment was performed to reduce the molecular pores by performing a specific acid treatment or calcination treatment. Zeolites are preferably used. Such a zeolite is preferable because it has no adverse effects such as a small oil absorption and a small amount of moisture absorption and a small surface acidity which are generated when the resin is dispersed in a resin. Examples of such zeolites include Shilton JC and AMT series manufactured by Mizusawa Chemical Industry Co., Ltd. The particle size of these fine particles is not particularly limited. However, if the particle size is too large, the film becomes practically fish-eye-like, or the film can be easily discriminated by visual observation. The effect of improving the properties is not exhibited. Therefore, the average particle size is preferably 1 to 15 μm, more preferably 3 to 10 μm, and still more preferably 3 to 6 μm.

In the present invention, the addition of these fine particles to the polyester requires that the concentration of the fine particles relative to the total amount of the polyester composition be 0.01% by weight to 1.0%, preferably 0.1% by weight. % To 0.8% by weight or less. That is, when the concentration of the fine particles is 0.01
If the amount is less than 10% by weight, the effect of improving the slip property hardly appears,
If the content exceeds 1.0% by weight, zeolite particles can be visually confirmed, the surface of the film has large irregularities, and a rough feeling is generated, which is not preferable because it causes ink to fly. The method of adding these fine particles to the polyester is, for example, an internal polymerization method added at the time of polymerization, or a master batch using a composition (master batch) previously mixed with a resin at a high concentration diluted to a predetermined concentration at the time of molding. Any method can be used, such as a dry blending method in which the resin pellets are directly scattered during molding, but an internal polymerization method or a master batch method is preferable from the viewpoint of stability of the amount added.

Higher Fatty Acid Derivative In the present invention, in order to obtain good slipperiness, a higher fatty acid derivative having a melting point of 50 ° C. to 220 ° C., specifically a metal salt, amide, ester or the like of a higher fatty acid is used. 0.01% by weight to 1.0% by weight based on the total amount of the polyester composition.
It is effective to add so as to have a concentration of 0.05% by weight, preferably 0.05% by weight to 0.5% by weight, more preferably 0.1% by weight to 0.3% by weight. If the melting point of these substances is less than 50 ° C., these substances may be melted near the supply port to the extruder, causing poor biting. Further, if the melting point of these substances is higher than the melting point of the resin, especially exceeding 220 ° C., the composition does not mix well with the molten resin in the extruder, causing compositional irregularities. Cause
Not preferred. If the concentration of these substances is less than 0.01% by weight, the slipperiness improving effect is not exhibited, and
Exceeding this is not preferred because these substances may bleed out to the surface to cause a problem in printability, or may cause the surface to stick.

The higher fatty acid constituting the higher fatty acid derivative used in the present invention includes a saturated or unsaturated monocarboxylic acid having 12 or more carbon atoms, and specifically, lauric acid, myristic acid, palmitic acid, stearic acid and the like. Acids, oleic acid, linoleic acid, linolenic acid, behenic acid, montanic acid and the like. As the metal salt, a salt with sodium, calcium, aluminum, magnesium, lithium, potassium, zinc, or the like is preferable, as the amide, an alkylenebisamide such as ethylenebisamide or methylenebisamide is preferable, and as the ester, octanol, decanol, lauryl alcohol, or Mytil alcohol,
Esters with higher alcohols having 8 or more carbon atoms, such as stearyl alcohol and behenyl alcohol, are preferred. Most desirable higher fatty acid derivatives include stearyl stearate, sodium montanate and potassium montanate. These higher fatty acid derivatives may be used alone or in combination of two or more.

The method of adding these higher fatty acid derivatives is not particularly limited, and any of a conventional dry blending method, a master batch method, and a method of adding at the time of polymerization can be used. Also, together with the above-mentioned synthetic zeolite or crosslinked silicone microparticles, a method of adding at the time of production of a masterbatch, a method of adding a part at the time of production of a masterbatch, and a method of adding the rest by a dry blending method, etc. be able to.

Polyester Composition In the present invention, a polyester composition obtained by adding fine particles of synthetic zeolite or crosslinked silicone and, if necessary, a higher fatty acid derivative to a specific polyester, has a temperature of 250 ° C.
The melt viscosity measured at 9 ° C. and a shear rate of 91.2 sec ⁻¹ is 1
000 poise to 30,000 poise, preferably 3000
Poise to 23,000 poise, more preferably 5000
Desirably, it is poise to 20,000 poise. If the melt viscosity is less than 1000 poise, the molten resin discharged from the die at the time of molding is unsteady due to a slight environmental change, so that stable molding cannot be performed or the strength of the film is reduced, which is not preferable. If it exceeds 30,000 poise, the extrusion torque becomes high, thickness unevenness due to discharge pressure fluctuation occurs, and the pressure balance with other resins during multilayer molding is poor,
It is not preferable because a uniform film cannot be formed.

Polyester Film In the present invention, the film comprising the above-mentioned polyester composition has remarkably improved slipperiness, and this fact can be confirmed by measuring the coefficient of friction. Thus, in a desirable embodiment of the polyester film of the present invention, the distance between the film surfaces is 2 in accordance with ASTM D-1894.
Static friction coefficient (μs65) measured at 3 ° C and 65% RH
Is preferably from 0.2 to 2.0. If the value of μs65 is less than 0.2, the film may be unwound when the film is wound up, or undesirably during transportation. If μs65 exceeds 2.0, the line aptitude is poor, squeaking noise, film meandering, and problems such as not being able to properly align the film even when trying to align bags made of this film may occur. So it is not preferable.

Further, in accordance with the same standard, 23 ° C., 65% RH
It is preferable that the ratio (μd65 / μs65) of the dynamic friction coefficient (μd65) measured under the environment to the static friction coefficient (μs65) is 0.5 to 1.0. If the value of this ratio is too small, in the bag making process that repeatedly moves and stops,
When the film starts to move, it needs a large force, and once it starts moving, the film slips too well and loosens without stopping in a line shape, and if you apply a large braking force to the feeding part to prevent this, the film Is undesirably stretched to the extent that the set bag size is not obtained, or a part of the heat-sealed film may become tight. On the other hand, if the value of this ratio is too large,

Further, in accordance with the same standard, 25 ° C., 90% R
Ratio of static friction coefficient (μs90) measured under H environment to the above static friction coefficient (μs65) (μs90 / μs65)
Is preferably 0.7 to 1.1. This is because if the coefficient of static friction changes with changes in humidity, the film running properties during film formation and processing suitability will change when using a film, for example, in summer and winter, when the weather is fine and when it rains. Is required to be changed, and the workability may be deteriorated.

The method of forming the polyester film of the present invention is not particularly limited, but a forming method capable of rapidly cooling the molten resin is desirable due to the properties of the polyester, and specifically, a water-cooled inflation method and a T-die casting method are preferable. It is. The film comprising the polyester composition of the present invention, obtained by these molding methods, can be further stretched to obtain a high-strength film. It can be used as a film having

In forming the film, in addition to the fine particles and the higher fatty acid derivative, various additives such as a known lubricant for stabilizing biting, an antioxidant, a weathering agent, a fluorescent brightener, and a dye / pigment are used. You may use the compounded polyester composition.

Multilayer Film The polyester film of the present invention is composed of the polyester composition of the present invention and has a heat-sealing property, so that it can be used as a single-layer film. Achieved. As such a multilayer structure, a film made of the polyester composition of the present invention is used as one surface layer of the multilayer film, and the other surface layer of the film has a melting point of 60 ° C to 170 ° C.
(Eg, ethylene-vinyl acetate copolymer or partially saponified product thereof, ethylene-ethyl acrylate copolymer, polyethylene, polypropylene, block copolymer containing propylene and various comonomers, random copolymer, etc.) Those having a film are preferred. The surface layer made of the polyolefin is suitable for performing simple and strong heat sealing during bag making.

As a method for producing the multilayer film, for example, a layer comprising the polyester composition and a melting point of 60 ° C.
A layer of polyolefin at 170 ° C.
A method of co-extrusion by the extrusion method or the T-die method, a method of dry laminating both layers separately formed using an adhesive, and an extrusion lamination method of continuously extruding and laminating a resin heated to a high temperature. To form a multilayer.

[0028]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. The evaluation of various physical properties in the following examples was performed as follows. (1) Dynamic viscoelasticity A sample of about 3 mm width × about 40 mm length cut out from a film was used and measured using an automatic dynamic viscoelasticity measuring apparatus (Oriental Tech Co., Ltd., Leo Vibron DDY-II-EA). The dynamic viscoelasticity data measured at a frequency of 110 Hz, a heating rate of 2 ° C./min, and a data sampling interval of 2 ° C. was analyzed, and the temperature at which Tan δ became the maximum (α dispersion temperature) was defined as Tg. (2) Slip property Using a friction measuring device (TR type, manufactured by Toyo Seiki Co., Ltd.)
23 ° C, 65% R in accordance with ASTM D-1894
Coefficient of static friction μs65 and μs90 measured at 25 ° C. and 90% RH under the conditions of H and 25 ° C. and 90% RH.
The dynamic friction coefficient μd65 measured under the condition of H was evaluated. (3) Toughness The film is rolled by hand at room temperature around a certain fold line.
° Bending was repeated and evaluated by the number of times until whitening or cracking occurred. (4) Melt viscosity Using a Capillograph (C type, manufactured by Toyo Seiki Co., Ltd.), measurement temperature: 250 ° C., shear rate: 91.2 sec ⁻¹ , L / D = 1
0, D = 1 mm, measured using a nozzle with an inflow angle of 90 degrees. (5) Haze Measured according to JIS K 7105.

(Manufacture of master batch) PBT (Novadur 50 manufactured by Mitsubishi Engineering-Plastics Corporation)
10, melt viscosity 5300 poise, glass transition temperature 83
° C) and various fine particles blended at a weight ratio of 85:15 to a twin-screw extruder (caliper = 30 mm, L / D = 3).
2, using a screw rotation speed of 200 rpm)
Strands continuously extruded at a temperature of 70 to 285 ° C. and a discharge rate of 10 kg / hr were cut to prepare respective master batches (MB1 to MB6). No. Fine particles Average particle size MB-1 Synthetic zeolite 7.5 μm (Shilton JC-70, spherical, manufactured by Mizusawa Chemical) MB-2 zeolite 10 μm (Shilton AMT100, cubic, manufactured by Mizusawa Chemical) MB-3 Crosslinked silicone particles 6 μm ( GE Toshiba Silicone Co., Ltd., Tospearl 2000B) MB-4 silica 3.5 μm (Fuji Silysia Chemical Ltd., Cycilia 740) MB-5 silica 6.5 μm (Fuji Silysia Chemical Co., Ltd., Cycilia 770) MB-6 cross-linked methyl methacrylate 6.5 μm (Art Pearl F-7P, manufactured by Negami Kogyo Co., Ltd.) In addition, at the time of production, MB-6 has an acrylic smell not only from the discharged strand but also from the cooled strand after cutting, and is used for food packaging films and the like. It turned out to be unsuitable for use.

(Polyester Composition and Film) Examples 1 to 7 and Comparative Examples 1 to 8 The above-mentioned MB-1 to PBT (Mitsubishi Engineering Plastics Co., Ltd., Novadour 5020S, melt viscosity 12,000 poise, glass transition temperature 84 ° C.) 5 were directly blended with various raw material polyester compositions by a T-die film forming machine (extruder diameter 40 mmφ, L / D = 25,
Screw compression ratio 3.5 rapid compression type, coat hanger type T die, width 600mm, lip opening 0.4mm)
Was extruded at a resin temperature of 265 ° C. and taken up by a mirror-finished cast roll having a surface temperature of 32 ° C. to form various cast films having a thickness of 30 μm. The results of evaluating the haze and slipperiness of each of these films are shown in Table 1 below. In addition, when the toughness of the films prepared in Examples 1 to 7 was evaluated, there was no change in appearance even when bent 50 times.

[0031]

[Table 1]

Comparative Example 9 In Example 1, PBT was replaced with a polyester elastomer (Hytrel 5557, manufactured by Toray Dupont, melt viscosity 1).
0000 poise, glass transition temperature 7 ° C) and MB
A film was obtained in the same manner as in Example 1, except that the additive particle concentration of -1 was changed from 0.3% by weight to 0.45% by weight. This film was milky white, and the contents could hardly be confirmed.

Example 8 In Example 3, the raw polyester composition was changed to PBT
In addition to the resin and MB-1, sodium montanate (H
OECHST product, trade name Hostamont NaV10
1, melting point 170 ° C.), except that it was dry-blended to a concentration of 0.2% by weight to form a cast film in exactly the same manner as in Example 3. The results of evaluating the haze and slipperiness of this film are shown below. Haze 9.5% Static friction coefficient μs65 = 0.5 μs90 = 0.5 μs90 / μs65 = 1.0 Dynamic friction coefficient μd65 = 0.5 μd65 / μs65 = 1.0

(Multilayer Film) Example 9 The outermost layer of the polyester composition of Example 1, an intermediate layer of an adhesive resin (Modick F534, manufactured by Mitsubishi Chemical Corporation), and a low-density polyethylene (Novatec LD, manufactured by Nippon Polychem Co., Ltd.)
FL243M, melting point 115 ° C.) was used for the innermost layer, and a three-layer three-layer inflation molding machine made by Placo (outermost layer 3) was used.
5 mmφ L / D = 24, middle layer 35 mmφ L / D =
24, innermost layer 40 mmφ L / D = 22, die diameter 7
BUR = 1.1, water cooling temperature 20 ° C.
Water-cooled inflation molding with polyester layer 3
0 μm, adhesive resinous fat layer 10 μm, polyolefin layer 50
A μm tubular film was obtained. The results of evaluating the slipperiness of this film are shown below. Static friction coefficient μs65 = 0.6 μs90 = 0.6 μs90 / μs65 = 1.0 Dynamic friction coefficient μd65 = 0.5 μd65 / μs65 = 0.8

The above tubular multi-layer film is placed in a thickness of 20 cm.
The bag was cut into lengths, and the lower portion was heat-sealed to prepare three bags each packed with 100 g of Novadur 5020S pellets. After the openings of the three bags were overlapped, the bags were sandwiched between two heat seal bars heated to 190 ° C. and sealed at a gauge pressure of 1 kg / cm ² for 30 seconds (so-called overlap seal). There was no problem with the heat sealing of each bag, and the three bags could be easily separated. No fluff and no fraying were observed in the heat-sealed portion of each bag.

[0036]

According to the present invention, a specific polyester is
By blending the synthetic zeolite or the crosslinked silicone particles in a certain range, it is possible to significantly improve the slipperiness especially at high humidity in the film forming and practical use stages, and further blend a specific higher fatty acid derivative. As a result, a film having a particularly remarkable improvement effect can be obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/09 C08K 5/09 5/098 5/098 // (C08L 67/02 83:04) (72 ) Inventor Nobukatsu Wakabayashi F-term in Technical Center, Mitsubishi Engineering-Plastics Co., Ltd. 5-6-2 Higashi-Hachiman, Hiratsuka-shi, Kanagawa 4F071 AA44 AA84 AA86 AA88 AB30 AC09 AF27 AF28 AF30 AH04 BB02 BB09 BC01 4F100 AA20H AC04H AJ11H AK01C AK03 AK03B AK06 AK41A AK42 AL05A BA03 BA07 BA10A BA10B DE01A EH17 EH172 EJ05H GB08 JA04B JA05A JA06A JK16 JN01 JN21 YY00A 4J002 CF031 CF051 CF061 CF071 CF081 CF101EG03 CF081

Claims (8)

[Claims] 1. A polyester and synthetic zeolite or a crosslinked silicone fine particle having a glass transition temperature (Tg) of 20 ° C. to 85 ° C. measured by a dynamic viscoelasticity method, and the concentration of the fine particle (based on the total composition) is A polyester composition having a content of 0.01% by weight to 1.0% by weight. 2. A polyester comprising terephthalic acid or isophthalic acid as a dicarboxylic acid component, tetramethylene glycol as a diol component and a temperature of 25%.
0 ° C., shear rate 91.2 sec ⁻¹ , 1000-3000
2. The composition according to claim 1, which has a melt viscosity of 0 poise.
The polyester composition according to item 1. 3. The polyester composition according to claim 1, comprising a higher fatty acid derivative having a melting point of 100 ° C. to 220 ° C. in a concentration of 0.01% by weight to 1.0% by weight. 4. The polyester resin composition according to claim 3, wherein the higher fatty acid derivative is stearyl stearate, sodium montanate or calcium montanate. 5. A polyester film comprising the polyester composition according to claim 1. 6. A method according to ASTM D-1894.
Coefficient of static friction (μs6
5) is 0.2 to 2.0 and the coefficient of static friction (μ
The polyester film according to claim 5, wherein the ratio (μd65 / μs65) of (s65) to the dynamic friction coefficient (μd65) measured under the same conditions is 0.5 to 1.0. 7. The ratio (μs90 / μs65) of the coefficient of static friction (μs65) in an environment of 23 ° C. and 65% RH to the coefficient of static friction (μs90) in an environment of 25 ° C. and 90% RH is 0.7. 7 or 1.1.
Polyester film according to 1. 8. A multilayer film, wherein the polyester film according to claim 5 and a film made of polyolefin having a melting point of 60 ° C. to 170 ° C. are arranged as both surface layers.