JPH0455215B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing a polyester film that is transparent, has excellent antistatic properties, and has excellent adhesion properties. As is well known, polyester films have a high degree of crystallinity, excellent transparency, gloss, mechanical properties, chemical resistance, heat resistance, etc., and are therefore rapidly being used in a wide range of applications year after year. However, since general polyester films have a high degree of electrical insulation, they have the disadvantage that they tend to generate and accumulate static electricity, causing various problems due to static electricity. for example,
In the film forming process, printing, adhesion, bag making, packaging, and other secondary processing processes, there may be a reduction in work efficiency such as wrapping around rolls, electric shock to the human body, difficulty in handling, the occurrence of printing whiskers, and film This causes dirt on the surface, which reduces the product value. As methods for preventing such electrostatic damage, there are generally two methods: kneading an antistatic agent into a resin to form a film, and coating the surface of a film with an antistatic agent. Regarding polyester films, this so-called kneading-type antistatic treatment method produces an antistatic effect by causing the antistatic agent to ooze out from inside the film to the surface, but due to the high secondary transition temperature of polyester resin, After the film is formed, the antistatic agent does not seep into the film at temperatures around room temperature.
On the other hand, due to the high film-forming temperature conditions and the high reactivity of the polar groups of polyester itself, the addition of antistatic agents may cause deterioration of the polymer during film-forming, and may cause discoloration and deterioration of physical properties. It was difficult because there were problems such as bringing In particular, in the case of biaxially stretched polyester films, the antistatic agent on the surface of the film escapes and disappears during the stretching process, often resulting in no antistatic effect at all.Furthermore, many of the antistatic agents are compounded in polyester films. This extremely reduces the transparency of the film, making it difficult to put it to practical use. Further, the conventional method of applying an antistatic agent to the film surface requires an extra processing step, which is economically disadvantageous. Furthermore, it is extremely rare to use a polyester biaxially stretched film alone for various purposes; for example, when used as a photographic film base, the adhesion between the gelatin layers and the magnetic layer when used as a magnetic tape base are important. In the case of a drafting base, the adhesion with the matting agent layer, in the case of metal vapor deposition, the adhesion with the vapor-deposited metal, and in the case of packaging, the adhesion with ink mainly based on nitrocellulose binder and heat sealing agent. At present, films are usually given appropriate surface treatments to improve their properties depending on their use. However, in general, undercoating agents that have an affinity for the surface of a polyester biaxially stretched film have poor adhesion to the surface layer agent, and those that have an affinity for the surface layer agent generally have poor adhesion to the surface of the polyester biaxially stretched film. There is a drawback. Furthermore, as is well known in the art, if the coefficient of friction of polyester film is large, the films will not slide against each other, and if it is extremely bad, blocking will occur, making it difficult not only to handle the film but also to make it difficult to wind it up. Conventionally, this objective has been achieved by adding inorganic or organic substances to the film, either singly or in combination, in order to lower the coefficient of friction of the film. However, if a small amount is added to such a film, the effect will be small, and if a large amount is added, the transparency, turbidity, etc. of the film will rapidly decrease. That is,
There has never been a film in which the transparency is almost the same as that without additives and the coefficient of friction is significantly lowered. Furthermore, even if the same amount of the same additive is added to polyester, the rate of decrease in the coefficient of friction largely depends on the heat treatment conditions, and the greater the heat coverage history, the greater the rate of decrease. On the other hand,
A method has been proposed to obtain a film with excellent lubricity and transparency by adding polyorganosiloxane or the like to a polyester film. The decrease in transparency is not negligible, and mechanical properties such as dimensional stability and Young's modulus also tend to decrease.Furthermore, there is a method of applying knurl processing before winding, but the knurled part is removed by slitting in secondary processing. Conventional manufacturing methods have had various problems, such as being trimmed or being present only on one side. As a result of intensive research, the inventors discovered a method to solve these problems. That is, in the present invention, on at least one side of a melt-extruded unstretched polyester film or a uniaxially stretched polyester film having an external lubricant amount of 300 ppm or less, (A) 0.5 to 15 mol % of the wholly aromatic dicarboxylic acid component is added.
Weight of a polyester copolymer formed from a mixed aromatic dicarboxylic acid component containing a sulfonic acid metal group-containing dicarboxylic acid and a glycol component after stirring in excess 80°C hot water for 24 hours Water-insoluble polyester copolymer with a decrease of 5% by weight or less (B) Water-soluble organic solvent with a boiling point of 60 to 200°C (C) Water (D) Inorganic particles and (E) Polyethylene glycol or its derivative or/and (F) Anion Antistatic agent (A)/(B)=100/20~
5000, (B)/(C)=100/50~10000, (A)/(D)=
A method for producing an easily adhesive antistatic polyester film, which comprises applying an aqueous dispersion of polyester resin blended at a weight ratio of 100,000/0.5 to 3,000, and then further biaxially or uniaxially stretching the coated film. [However, the water-soluble organic solvent is one in which the solubility of 1 in water at 20°C is 20 g or more. ] The polyester copolymer (A) contained in the aqueous dispersion of the present invention is composed of 0.5 to 15 mol% of a dicarboxylic acid containing a sulfonic acid metal group and 85 to 99.5 mol% of a dicarboxylic acid containing no sulfonic acid metal group. It is a substantially water-insoluble polyester copolymer obtained by reacting a mixed dicarboxylic acid with a glycol component. Substantially water-insoluble means that the polyester copolymer does not dissipate in hot water even if the polyester copolymer is stirred in hot water at 80°C, and specifically, the polyester copolymer does not dissipate in hot water. The weight loss of the polyester copolymer after being stirred in 80°C hot water for 24 hours is 5% by weight or less. Examples of the above-mentioned dicarboxylic acids containing sulfonic acid metal groups include metals such as sulfoterephthalic acid, 5-sulfoisophthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, and 5[4-sulfophenoxy]isophthalic acid. salt was given,
Particularly preferred are 5-sodium sulfoisophthalic acid and sodium sulfoterephthalic acid. These sulfonic acid metal base-containing dicarboxylic acid components are 0.5 to 15 mol% of the total dicarboxylic acid components.
If it exceeds 15 mol%, the water dispersibility will improve, but the water resistance of the polyester copolymer will be significantly reduced, and if it is less than 0.5 mol%, the water dispersibility will decrease significantly. The dispersibility of the polyester copolymer in water varies depending on the copolymer composition, the type and blending ratio of the water-soluble organic compound, etc., but the above dicarboxylic acid containing a sulfonic acid metal group can be used as long as it does not impair the dispersibility in water. , a small amount is preferred. As the dicarboxylic acid containing no sulfonic acid metal base, aromatic, aliphatic, and alicyclic dicarboxylic acids can be used. Aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, orthophthalic acid,
Examples include 2,6-naphthalene dicarboxylic acid. These aromatic dicarboxylic acids preferably account for 40 mol% or more of the total dicarboxylic acid components. If it is less than 40 mol%, the mechanical strength and water resistance of the polyester copolymer will decrease. Addition of aliphatic dicarboxylic acids or alicyclic dicarboxylic acids may improve adhesive performance in some cases, but usually reduces the mechanical strength and water resistance of the polyester copolymer. The glycol component to be reacted with the mixed dicarboxylic acid is an aliphatic glycol having 2 to 8 carbon atoms or an aliphatic glycol having 6 to 12 carbon atoms, and specifically, ethylene glycol, 1,2-
Propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol These include methanol, p-xylylene glycol, diethylene glycol, triethylene glycol, and the like. Examples of polyethers include polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Polyester copolymers are obtained by conventional melt polycondensation. In other words, there is a direct esterification method in which the above dicarboxylic acid component and glycol component are directly reacted, water is distilled off and esterified, and then polycondensation is performed, or the dimethyl ester of the above dicarboxylic acid component and the glycol component are reacted to form methyl alcohol. It can be obtained by a transesterification method, etc., which involves distilling off, transesterifying, and then polycondensing it. In addition, solution polycondensation, interfacial polycondensation, etc. may also be used, and the polyester copolymer of the present invention is not limited by the polycondensation method. To obtain the aqueous dispersion of the polyester copolymer described above, it is necessary to disperse it in water together with a water-soluble organic solvent. For example, the above polyester copolymer and a water-soluble organic compound are mixed in advance at 50 to 200°C, and water is added to this mixture and dispersed by stirring, or conversely, the mixture is added to water and dispersed by stirring. method, or by coexisting a polyester copolymer, a water-soluble organic solvent, and water.
There is a method of stirring at °C. The above-mentioned water-soluble organic solvent is an organic solvent having a solubility of 1 in water of 20 g or more at 20°C, and specifically includes aliphatic and alicyclic alcohols, ethers, esters, and ketone compounds, such as methanol, ethanol, Monohydric alcohols such as isopropanol and n-butanol, glycols such as ethylene glycol and propylene glycol. Glycol derivatives such as methyl cellosolve, ethyl cellosolve, n-butyl cellosolve, dioxane,
These include ethers such as tetrahydrofuran, esters such as ethyl acetate, and ketones such as methyl ethyl ketone. These water-soluble organic solvents can be used alone or in combination of two or more. Among the above compounds, butyl cellosolve and ethyl cellosolve are preferred in terms of dispersibility in water and coatability on films. The weight ratio of (A) polyester copolymer, (B) water-soluble organic solvent and (C) water is (A)/(B)=100/20~5000 (B)/(C)=100/ It is important to satisfy the range of 50 to 10,000. (A)/(B) has less water-soluble organic solvent than polyester copolymer.
When the ratio exceeds 100/20, the dispersibility of the aqueous dispersion decreases. In this case, dispersibility can be assisted by adding a surfactant, but if the amount of surfactant is too large, adhesiveness and water resistance will decrease. Conversely, if (A)/(B) is less than 100/5000, or (B)/(C) exceeds 100/50, the amount of water-soluble organic solvent in the aqueous dispersion will increase, making it difficult to perform in-line coating. There is a risk of explosion due to the solvent used, and explosion-proof measures must be taken to prevent this from occurring, further causing environmental pollution and
Since the cost is high, it is necessary to consider compound recovery. When (B)/(C) is less than 100/10,000, the surface tension of the aqueous dispersion increases, the wettability to the film decreases, and coating spots are likely to occur. in this case,
Although wettability can be improved by adding a surfactant, if the amount of surfactant is too large, the adhesiveness and water resistance will decrease as described above. Furthermore, the (D) inorganic particles added to this dispersion include chalk, chiyolk, heavy carbon, light carbon, ultrafine carbon, basic magnesium carbonate, dolomite, special calcium carbonate, kaolin, and calcined clay. , birofluorite, bentonite, serisarite, zeolite, nepheline, sinite,
Talc, attabuldianite, synthetic aluminum silicate,
There are synthetic calcium silicate, diatomaceous earth, silica powder, finely divided silicic acid, finely divided silicic anhydride, aluminum hydroxide, barite, precipitated barium sulfate, natural gypsum, gypsum, calcium sulfite, etc. Which one should be used in relation to transparency and slipperiness? Particularly preferred are natural and synthetic silicic acids. It is preferable to use particles with a particle size of 0.01μ to 10μ. If the particle size is 0.01 μm or less, a large amount must be used, and if the particle size is 10 μm or more, coarse protuberances will occur and the slipperiness will deteriorate. The amount of (D) used for (A) is (A)/(D)=100000/
A ratio of 0.5 to 3000 is good, preferably (A)/(D)=
1000/20 to 100. Polyethylene glycol or its derivatives usually have a molecular weight of 1,000 to 50,000, and those represented by the following general formula are typical, but are not limited thereto. R-O (C ₂ H ₄ O) - _n R' R, R′: Hydrogen, C _1-20 hydrocarbon group, epoxy group or -COR group (R is C _1-28 hydrocarbon group) R″: C _1-28 hydrocarbon group m, n: 3 -100 In addition, all of the above _C1-28 hydrocarbon groups are preferably _C1-20 alkyl groups and alkylaryl groups. Examples of commonly used polyethylene glycol derivatives include the following: Yes. R・O(-C ₂ H ₄ O)- _n H(R: lauryl, n-octyl, stearyl, cetyl) (R: octylphenyl, nonylphenyl, dodecylphenyl) (R: lauryl, stearyl) (R: lauryl, stearyl) (R: lauryl, stearyl) (R: lauryl, stearyl) Polyethylene glycol or its derivatives are used in an amount of 1 to 20% based on the water-insoluble polyester copolymer. In addition, anionic antistatic agents include higher alcohols, phosphoric acid ester salts of alkylphenol oxide adducts, various other phosphoric acid derivatives such as phosphonic acids, phosphinic acids, and phosphite esters, Na salts of higher alcohol sulfuric esters,
Organic amine salts, sulfuric acid ester salts of alkylphenol ethylene oxide adducts, alkyl sulfonates, sulfuric acid derivatives such as alkylaryl sulfonic acids, sodium salts of sarcosinate stearate, and carboxylic acid derivatives such as triethanolamine salts of sebacic acid. Preferred examples include those containing a sulfone group, such as Na salt of dodecylbenzenesulfonate, potassium salt of octylsulfonate, sodium salt of oligostyrene sulfonate, sodium salt of dibutylnaphthalenesulfonate, and sodium salt of lauryl sulfosuccinate ester. If the amount of polyethylene glycol or derivatives and anionic antistatic agent is too small, antistatic properties cannot be achieved, and if the amount is too large, easy adhesion and transparency will be reduced. The aqueous dispersion of the polyester copolymer thus obtained is applied to a polyester film, either as an unstretched film obtained by melt-extruding the polyester film, or as a uniaxially stretched film. Coating on a biaxially stretched film is not preferred because it is difficult to coat uniformly because the film is wide and the film travels at a high speed. The amount of the aqueous dispersion applied to the polyester film is 0.01 to 5 as the amount of polyester copolymer present on the film after biaxial stretching.
g/ ^m2 . If the coating amount is less than 0.01 g/m ² , the force for fixing inorganic particles will be weak and the durability will be poor. If you apply ^more than 5.0g/m2, the slipperiness will worsen. The polyester film obtained by the method described above has excellent transparency, easy sliding properties, antistatic properties, and easy adhesion properties. In addition, by subjecting the polyester film to a corona discharge treatment before applying the aqueous dispersion of the polyester copolymer, the coating properties of the aqueous dispersion are improved, and the coating of the polyester film and polyester copolymer is improved. The adhesive strength between the two is improved. In addition, the wettability and adhesion of the film surface can be improved by subjecting the polyester copolymer layer after inline coating or biaxial stretching to corona discharge treatment, corona discharge treatment under a nitrogen atmosphere, ultraviolet irradiation treatment, etc. can be done. The coated polyester film produced by the above method is used as a base film for magnetic tapes, a base film for label stickers, a base film for chemical mats, a film for overhead projectors, a film for food packaging, and films for other uses. be done. Examples of the present invention will be described below. In the examples, parts and % are based on weight. Example 1 (1) Production of transparent polyethylene terephthalate Lead hydroxide in 200ml of ethylene glycol
PbO・pb(OH) ₂ 2.2g (pb0.95×10 ^-2 mol) was dissolved, GeO ₂ 2.0g (1.9×10 ^-2 mol) was added to this solution, and the mixture was heated at the boiling point of ethylene glycol at 197℃. A clear solution was obtained in about 30 minutes upon heating to reflux. Next, polyethylene terephthalate was produced using this solution as a polycondensation catalyst. 620 parts of dimethyl terephthalate, 480 parts of ethylene glycol, zinc acetate as transesterification catalyst
Add 0.036 parts of Zn(OAc) 2.2H _{2 O} to a transesterification reactor, and conduct the transesterification reaction from 150℃ to 230℃.
It took 120 minutes to complete the distillation of methanol. Next, the contents were transferred to a polycondensation apparatus, and the above catalyst solution was added as a polycondensation catalyst.
Add 2.7 parts, gradually raise the temperature and reduce the pressure,
The polycondensation reaction was carried out for 25 minutes at 280°C under a high vacuum of 0.5 mmHg, and the resulting polymer had an intrinsic viscosity of 0.63 and a melting point of 262°C. (2) Production of aqueous dispersion of polyester copolymer 117 parts of dimethyl terephthalate (49 mol%),
Dimethyl isophthalate 117 parts (49 mol%), ethylene glycol 103 parts (50 mol%), diethylene glycol 58 parts (50 mol%), zinc acetate 0.08
40 parts and 0.08 parts of antimony trioxide in a reaction vessel.
The temperature was raised to ~220°C to carry out the transesterification reaction for 3 hours, and then 9 parts (2 mol%) of 5-sodium sulfoisophthalic acid was added and the mixture was heated to 220°C to 260°C for 1 hour.
The esterification reaction was carried out for a period of time, and further under reduced pressure (10~
A polyester copolymer having an average molecular weight of 18,000 and a softening point of 140°C was obtained by carrying out a polycondensation reaction at 0.2 mmHg) for 2 hours. 300 parts of this polyester copolymer and 140 parts of n-butyl cellosolve were mixed in a container at 150 parts
Stir at ~170℃ for about 3 hours to obtain a homogeneous and viscous melt. 560 parts of water is gradually added to this melt, and after about 1 hour, a uniform pale white solid content is obtained.
Obtain a 30% aqueous dispersion and add thyroid to this.
150 to 500ppm to polyester copolymer,
5% polyethylene glycol with a molecular weight of 20,000,
Sodium dodecylbenzenesulfonate 1%, water
4,500 parts of ethyl alcohol were added to dilute the solution to obtain a coating solution with a solid content concentration of 3%. (3) Production of inline coated film The polyethylene terephthalate produced in (1) is
Melt extrusion at 280-300℃ and cooling with a cooling roll at 15℃ to obtain an unstretched film with a thickness of 1000 microns.This unstretched film is rolled 3.5 times in the longitudinal direction between a pair of rolls at different circumferential speeds at 85℃. Stretch it, apply the previous coating solution using an air knife method, dry it with hot air at 70℃, and then use a tenter to spread it horizontally at 98℃.
The film was stretched 3.5 times and further heat-set at 200 to 210°C to obtain a biaxially stretched coated polyester film with a thickness of 100 microns. The compound numbers of polyethylene glycol and its derivatives in the examples are as follows. Compound No. Polyethylene glycol (MW20000) [] (MW5000) [] Polyoxyethylene nonyl phenol ether (EO:15) [] The compound numbers of the anionic antistatic agents are as follows. Sodium dodecylbenzenesulfonate [1] Lithium oligostyrene sulfonate [2] Sodium dialkyl sulfosuccinate [3]

[Table] In Table 1, TPA is equivalent to terephthalic acid, IPA is equivalent to isophthalic acid, SSI is 5-sodium sulfoisophthalic acid, EG is ethylene glycol, DEG is diethylene glycol, NPG is neopentyl glycol, and PEG is polyethylene glycol. Water-insoluble means that the polyester copolymer has an excess of 80%
The weight loss rate (%) of the polyester copolymer was measured after being stirred in hot water for 24 hours. Examples 2 to 3 Biaxially stretched films were obtained in the same manner as in Example 1 except that the PEG derivative was changed. Examples 4-5 Except for changing the antistatic agent in Example 1,
A biaxially stretched film was obtained in the same manner as in Example 1. Examples 6 to 7 Biaxially stretched films were obtained in the same manner as in Example 1, except that the amount of Thyroid 150 added was changed. Example 8 A biaxially stretched film was obtained in the same manner as in Example 6 except that Thyroid 240 was added to the polyethylene terephthalate. Example 9 A biaxially stretched film was obtained in the same manner as in Example 1 except that DEG was replaced with NPG. Example 10 A biaxially stretched film was obtained in the same manner as in Example 9 except that the amount of SSI was increased. Example 11 A biaxially stretched film was obtained in the same manner as in Example 9 except that PEG was added instead of 1 mol EG. Example 12 A biaxially stretched film was obtained in the same manner as in Example 12 except that the PEG compound in Example 11 was changed. Comparative Examples 1 to 3 Biaxially stretched films were obtained in the same manner as in Example 1 except that Thyroid 150, PEG, and one of the antistatic agents were not added. Comparative Examples 4 to 5 A biaxially stretched film was obtained in the same manner as in Example 1 except that the amount of PEG was changed to a value other than the claimed range. Comparative Examples 6 to 7 Biaxially stretched films were obtained in the same manner as in Example 1, except that the amount of antistatic agent in Example 1 was changed to a value other than the claimed range. Comparative Example 8 A biaxially stretched film was obtained in the same manner as in Example 1 except that Thyroid 150 in Example 1 was replaced with Thyroid 600 having a large particle size. Comparative Example 9 A biaxially stretched film was obtained in the same manner as in Example 8 except that the amount of thyroid 240 in the polyethylene terephthalate was changed to a value other than the claimed range. Comparative Example 10 Example 1 except that in Example 1, the amount of SSI and Thyroid 150 were added in an amount exceeding the claimed range.
A biaxially stretched film was obtained in the same manner as above.

【table】

[Table] The haze in Table 2 was measured according to JIS K6714 using a haze meter manufactured by Nippon Seimitsu Kogaku. The friction coefficient is a value measured on both coated and uncoated surfaces using Tensilon manufactured by Toyo Seiki Co., Ltd. in accordance with ASTM-1894. Blocking property was determined by placing the coated and uncoated surfaces in close contact, cutting the pieces into 8 x 12 cm pieces, sandwiching them between two silicone rubber sheets, sandwiching them between glass plates, and applying a 2 kg load from above the glass plate. , this at 40℃, 80
%RH for 24 hours, then remove the film and visually judge the blocking condition between the films. 5% or less of the blocking area is ○, 5 to 20% is △, and 20% or more is ×. Indicated. For adhesion, apply polyvinyl alcohol vinyl chloride vinyl acetate copolymer polymethyl methacrylate with a highly compatible red dye added to a thickness of 3μ, and apply Nichiban sellotape so that the peeling angle is 180°. It was then peeled off. It was ranked as 10 if there was no peeling at all, 5 if half of it was peeled off, and 1 if all of it was peeled off. The surface resistance was measured using a specific resistance measuring device manufactured by Takeda Riken under conditions of an applied voltage of 500 V, 20° C., and 65% RH. In Table 2, the present invention exhibits good characteristics in all of the haze friction coefficient, blocking properties, adhesion properties, and surface resistance (antistatic properties). However, when no thyroid was added (Comparative Example 1), the sliding and blocking properties were poor, and when no PEG or antistatic agent was added (Comparative Examples 2 and 3), the adhesion and antistatic properties were poor, and the amount of PEG was When it is too small (Comparative Example 4)
Poor adhesion and too much PEG (Comparative Example 5) Poor haze, slipperiness, and adhesion, easy blocking, and too little antistatic agent (Comparative Example 6) Poor antistatic properties; When the amount is too high (Comparative Example 7) When the haze and adhesion are poor and blocking occurs easily, and the particle size of thyroid is large (Comparative Example 8) When the haze and slipperiness are poor and a large amount of thyroid is added to polyethylene terephthalate (Comparative Example 9) ) When the haze is poor and the amount of SSI is too large and the amount of Thyroid 150 is too large (Comparative Example 10), it can be seen that the haze is poor and the blocking property is poor. Comparative Example 11 Except for using a water-insoluble polyester having the following composition in Example 1 [(Polyester copolymer consisting of 50 mol% TPA, 40 mol% IPA, 10 mol% SSI, 30 mol% EG, and 70 mol% DEG) Water-insoluble 15.2
%] The same procedure as in Example 1 resulted in a haze of 2.4.
%, static friction coefficient is 0.44, blocking property is ×, adhesion is 7, 9, and 9 respectively, and surface resistance is 1.2.
It was ×10 ⁹ .

Claims (1)

[Scope of Claims] 1. On at least one side of a melt-extruded unstretched polyester film or uniaxially stretched polyester film having an external lubricant amount of 300 ppm or less, (A) 0.5 to 15 mol % of the wholly aromatic dicarboxylic acid component.
A polyester copolymer formed from a mixed aromatic dicarboxylic acid component containing a dicarboxylic acid containing a sulfonic acid metal group and a glycol component was stirred in excess hot water at 80°C for 24 hours. Water-insoluble polyester copolymer with a weight loss of 5% or less (B) Water-soluble organic solvent with a boiling point of 60 to 200°C (C) Water (D) Inorganic particles and (E) Polyethylene glycol or its derivatives or/and (F) Anionic antistatic agent (A)/(B)=100/20~
5000, (B)/(C)=100/50~10000, (A)/(D)=
A method for producing an easily adhesive antistatic polyester film, which comprises applying an aqueous dispersion of polyester resin blended at a weight ratio of 100,000/0.5 to 3,000, and then further biaxially or uniaxially stretching the coated film. [However, the water-soluble organic solvent is one in which the solubility of 1 in water at 20°C is 20 g or more. 2. The manufacturing method according to claim 1, wherein the polyester film is a polyethylene terephthalate film. 3. The manufacturing method according to claim 1, wherein the inorganic particles have an average primary particle size of 0.01μ to 10μ. 4. The manufacturing method according to claim 1, wherein the amount of external lubricant in the melt-extruded unstretched polyester film or uniaxially stretched polyester film is 300 ppm or less. 5 The amount of polyethylene glycol or its derivative added is 1 to the water-insoluble polyester copolymer.
20% by weight. 6. The manufacturing method according to claim 1, wherein the amount of anionic antistatic agent added is 0.1 to 10% by weight based on the water-insoluble polyester copolymer.