JPS6019522A - Coating polyester film - Google Patents

Abstract

PURPOSE:To prepare explosion-proof and safe polyester film capable of recycling by dispersing specific water-insoluble polyester copolymer with watersoluble organic compound in water and laminating it by the in-line coat method. CONSTITUTION:At least one side of a molten, extruded and unstretched polyester film or a uniaxial stretched polyester film is processed by corona-discharge. Aqueous dispersing liquid comprising (A) water insoluble polyester copolymer composed of mixed di-carbonic acid containing 0.5-7mol% sulfonic acid metallic base contained di-carbonic acid to total di-carbonic acid component, (B) water soluble organic compound with a boiling point 60-200 deg.C and (C) water and having polyester resin with polymerizing rate of (A)/(B)=100/20-5,000, (B)/(C)=100/50-10,000 is applied to said processed surface and then said coated film, further, is stretched biaxially or uniaxially.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for making coated polyester films.

Biaxially stretched linear polyester film, especially biaxially stretched film made of polyethylene terephthalate, has excellent mechanical strength, heat resistance, chemical resistance, transparency, dimensional stability, etc., so it can be used as a beine film for magnetic tapes. It is used in a variety of applications such as insulating tape, photographic film, tracing film, and food packaging film. However, polyester films generally have poor adhesion.

When laminating a magnetic material, a photosensitive agent, a matting agent, etc., it is common to apply a corona discharge to the film surface every tl and further provide an anchor coating agent. When used in fresh food packaging, there is a drawback that the overall heat sealing strength is reduced because the adhesiveness with the printed layer and the heat seal layer is weak. Corona discharge treatment is generally used as a method to improve the adhesion of polyester film surfaces, and other physical treatment methods include ultraviolet irradiation treatment, plasma discharge treatment, flame treatment, and corona discharge treatment under a nitrogen atmosphere. or,
Chemical treatment methods such as alkali treatment and primer treatment, and treatment methods that use these in combination are known. Although the method of coating with a suitable primer after corona discharge treatment provides relatively high adhesion performance, it increases the number of steps and costs, which limits its application. Further, as a method of performing primer treatment at low cost, a method of performing primer treatment during the film forming process is known. Namely.

It is known that a thermoplastic resin film uniaxially stretched in the longitudinal direction is coated with a solution or emulsion containing a polymeric substance as a main component, and then stretched in the transverse direction to obtain a biaxially stretched film coated in the film forming process. This method is called the in-wine coating method.

This in-wine coating method has the problem that the coating agent is mixed into the film during the film forming process, making it impossible to recycle the waste film generated by cutting edges of the film forming process. There may be problems such as insufficient adhesion. For example, polyacrylate emulsions and water-soluble polyurethane resins are known as coating agents for in-line coating of polyester films, but these coating agents reduce the transparency of the film and make it difficult to recycle. In order to do this, it is necessary to wash the recycled film, which increases the cost. As a coating agent for the in-line Co-1 method for polyester films, 50 mol% or more of the total dicarboxylic acid component is an aromatic dicarboxylic acid component, and an ester-forming alkali metal nulphonic acid salt compound 2 to 40% is used.
Mol% (''A dicarboxylic acid component) and glyco/ll
In the polyester segment containing r, the molecule i 600
~6000 polyethylene glycol 20-80% by weight
A block polyether ester obtained by copolymerizing (paired polymer) is known (see Japanese Patent Publication No. 16557/1983). However, since this known coating agent is water-soluble and can be coated as an aqueous solution, it has the advantage that no explosion-proof measures against organic solvents are required during the coating process.

It has extremely poor water resistance, and the coating layer tends to peel off under high temperature and humidity, so it is used for packaging fragile foods.

Packaged products cannot be boiled or totorted.

As a result of intensive research aimed at solving all of the above problems, the present inventors have discovered that a specific polyester copolymer that is insoluble in water is dispersed in water together with a water-soluble organic compound, and a seta coating agent is applied using an in-line co-) method. The present invention provides a method for producing a coated polyester film with improved adhesion, which allows the film to be recycled by laminating, has good explosion-proof safety in the coating process, and has improved adhesion.

That is, this invention applies corona discharge treatment to at least one side of an unstretched polyester film or a uniaxially stretched polyester film that has been extruded by melt cutting, and then applies a corona discharge treatment to this treated side.
(2) A water-insoluble polyester copolymer consisting of a mixed dicarboxylic acid containing 05 to 7 mol % of a dicarboxylic acid containing a metal base of nurphonate to the total dicarboxylic acid components; compound and (C)
Consisting of water, (A)/of) = 100/20~5000
, ■/(C)-Production of a coated polyester film characterized by coating an aqueous dispersion of polyether resin in a weight ratio of 100,150 to 100,000 and then further biaxially or uniaxially stretching the coated film. It is the law.

The polyester copolymer (8) contained in the aqueous dispersion of this invention is a dicarboxylic acid containing a sulfonic acid metal group.
It is a substantially water-insoluble polyester copolymer obtained by reacting a mixed dicarboxylic acid of 5 to 7 mol % and 93 to 995 mol % of a dicarboxylic acid not containing a metal nurphonate base with a polyol component. Substantially water-insoluble means
This means that even if the polyester copolymer is stirred in hot water at 80°C, the polyester copolymer will not dissipate in the hot water.

Specifically, the weight loss of the polyester copolymer after being stirred for 24 hours in 80° C. hot water containing excess polyester copolymer is 5% by weight or less.

The above-mentioned sulfonic acid metal base-containing dicarboxylic acids include:
Examples include metal salts of sulfoterephthalic acid, 5-nulphoisophthalic acid, 4-nulphophthalic acid, 4-nulfonaphthalene-2,7-dicarboxylic acid, 5[4-nulphophenoxy]isofucric acid, and particularly preferred are 5-nulphophthalic acid. -Sodium sulfoisophthalate, sodium nulphoterephthalate. These dicarboxylic acid components containing nurphonic acid metal bases are present in an amount of 0.5 to 7 mol % based on the total dicarboxylic acid components, and if it exceeds 7 mol %, the dispersibility in water will improve, but the water resistance of the polyester copolymer will decrease. decreased significantly and also decreased to 0
If the amount is less than 5 mol %, the dispersibility in water will be significantly reduced. 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-mentioned sulfonic acid metal group-containing dicarboxylic acid may be used as long as it does not impair its dispersibility in water. A small amount of force is preferable.

As a dicarboxylic acid that does not contain nurphonic acid metal base,
Aromatic, aliphatic, and alicyclic dicarboxylic acids can be used.

Examples of aromatic dicarboxylic acids include terephcuric acid, isophthalic acid, orthophthalic acid, and 2,6-knack dicarboxylic acid. It is preferable that these aromatic dicarboxylic acids account for 40 mol% or more of the total dicarboxylic acid components, and if it is less than 40 mol%, the mechanical strength and water resistance of the polyester copolymer will decrease. Aliphatic and alicyclic dicarboxylic acids include succinic acid, adipic acid, and sebacin F! Ll, 3-cyclopentanedicarboxylic acid = 1.2
- Cyclohexanedicarboxylic acid.

(2) 3-cyclohexanedicarboxylic acid% 1,4-cyclohexanedicarboxylic acid and the like. Addition of these non-aromatic dicarboxylic acid components may improve adhesive performance in some cases, but generally reduces the mechanical strength and water resistance of the polyester copolymer.

The polyol component to be reacted with the mixed dicarboxylic acid is an aliphatic glycol having 2 to 8 carbon atoms or an alicyclic glycol having 6 to 12 carbon atoms, and in the M orientation, ethylene glycol-1,2- Propylene glycol-1
,3-propanediol.

1.4-butanediol, neopentyl glycol, l
, 6-hexanedio-lv% 1,2-cyclohexane dimetatool, 1,3-cyclohexane dimetatool,
These include 1,4-cyclohexane dimetatool, p-gysylylene glycol, diethylene glycol), triethylene glycol, and the like. Examples of polyethers include polyethylene glycol, polypropylene gelylcol, and Bolite I/ramethylene 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, followed by esterification through sonic distillation, and then single polycondensation is performed, or methyl alcohol is obtained by reacting the dimethyl ester of the above dicarboxylic acid component with the glycol component. It can be obtained by a transesterification method, which involves distillation, transesterification, and then polycondensation. 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.

During melt polycondensation, antioxidants, slip agents, inorganic fine particles, antistatic agents, and the like can be added as appropriate.

To obtain the aqueous dispersion of the above polyester copolymer,
It is necessary to disperse it in water together with water-soluble organic compounds. For example, the above-mentioned polyester copolymer and a water-soluble organic compound are mixed in advance (at 50 to 200°C), water is added to this mixture and the mixture is stirred to disperse, or conversely, the mixture is added to water and dispersed. There is a method of stirring and dispersing, or a method of stirring the polyester copolymer, a water-soluble organic compound, and water together at 40 to 120°C.

The water-soluble organic compound is an organic compound having a solubility in water of 11 of 20f or more at 20°C.

Specifically, aliphatic and alicyclic alcohols, ethers,
Ester and ketone compounds, such as monohydric alcohols such as methanol, ethanol, isopropanol, and n-butanol; glycols such as ethylene glycol and propylene glycol; and glycols such as methyl cellosolve, ethyl cellosolve, and n-butyl cellosolve. Derivatives - ethers such as dioxane and tetrahydrofuran, esters such as ethyl acetate, and ketones such as methyl ethyl ketone. These water-soluble organic compounds may be used alone or in combination.
More than one species can be pressured together. Among the above-mentioned compounds, butyl cellosolve and ethyl cellosolve are preferred in terms of dispersibility in water and applicability to films.

The weight ratio of the above (5) polyester copolymer, ■) water-soluble organic compound, and (C) water is (A)/(Bl=
100/20~5000a3)/(O-100150
It is important to satisfy 10,000. Contains less water-soluble organic compounds than polyester copolymer (A)/
When (g) 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. vice versa(
If A)/Q3) is less than 10015000, or if)/(C) exceeds 100150, the amount of water-soluble organic compounds in the aqueous dispersion will increase and there will be a risk of explosion due to the solvent during in-line coating. For this reason, it is necessary to take explosion-proof measures, and furthermore, it is necessary to take into account the recovery of the compound, as it will cause environmental pollution and increase the core. (B)/(
When C) is less than 100/10000, the surface tension of the aqueous dispersion increases, the wettability to the film decreases, and coating spots are likely to occur. In this case, the wettability can be improved by adding a surfactant, but if the amount of the surfactant is too large, the adhesiveness and water resistance will decrease as described above.

A slip agent, an antistatic agent, an antiblocking agent, an ultraviolet absorber, a crosslinking agent, etc. may be added to the above aqueous dispersion.

Aqueous dispersion of polyester resin as polyester 7, ()
For coating on L-frames, the polyester film is either a melt-extruded unstretched film or a -axially oriented film. Coating on a biaxially stretched film is not preferred because the film is wide and the film travels at a high speed, making uniform coating difficult. .

The amount of the aqueous dispersion applied to the polyester film is 0.01 to 597 nl as polyester copolymer to the film after biaxial stretching. Application amount is 0.0
1 da/n? If it is less than 1, the adhesiveness of the ink layer, magnetic material layer, photosensitive agent layer, etc. provided on the polyester copolymer layer will be insufficient. If the coating amount exceeds 59/n ('f), the mechanical strength of the polyester film will decrease, and the amount of polyester copolymer in the recovered and recycled film will increase, resulting in a decline in the mechanical strength and heat resistance of the recycled film. However, if the coating amount exceeds 59Ay?'z, it becomes possible to impart heat-sealing properties, but the slipperiness and blocking resistance of the film decrease.This decline in slipperiness and blocking resistance is caused by aqueous dispersion This can be prevented by adding fine particles of inorganic or organic compounds to the product.

By subjecting the polyester film to corona discharge treatment before applying the aqueous dispersion of the polyester resin described above, the applicability of the aqueous dispersion is improved and the adhesive strength between the polyester film and the polyester copolymer coating is improved. 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. I can do it.

The coated polyester film produced by the above method is used as a Beine film for magnetic tapes, a Beine 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.

This invention will be explained in detail below. In the examples, part 1% indicates weight.

Example 1 (a) Aqueous dispersion of polyester copolymer containing 117 parts (49 mol%) of dimethyl terephthalate, 117 parts (49 mol%) of dimethyl isophthalate, 103 parts (50 mol%) of ethylene glycol, diethylene glycol
/L'58 parts (50 mol%), zinc acetate 0.08 parts, and antimony trioxide 0-08 parts in a reaction vessel at 40-220 parts.
The temperature was raised to 220-260°C and the transesterification reaction was carried out for 3 hours. Then, 9 parts (2 mol%) of 5-sodium nurphoisophthalic acid was added and the transesterification reaction was carried out at 220-260°C for 11 hours. The polycondensation reaction was carried out for 2 hours with Q2 (Hg), and the mixture was stirred for about 3 hours on average to obtain a homogeneous and viscous melt.

560 parts of water was gradually added to this melt, and after about 1 hour, a uniform pale white aqueous dispersion with a solid content concentration of 30% was obtained.To this, 4500 parts of water and 4500 parts of ethyl alcohol were further added to dilute the solid content. A coating solution having a concentration of 3% was obtained.

(2) Production of inline coated film Polyethylene terephthalate t Melt extrusion at 280-300°C, 1
Cooled with a cooling roll at 5°C to obtain an unstretched film with a thickness of 130 microns, and stretched 3.5 times in the longitudinal direction between a pair of rolls at 85°C with different circumferential speeds of this unstretched film 711'. This axially stretched film is subjected to corona discharge treatment,
The above coating solution was applied to the corona discharge treated surface using an air knife method, dried with hot air at 70°C, and then heated at 98°C using a tenter.
Stretched 3.5 times in the transverse direction at °C and further stretched 200-210 times.
A biaxially stretched coated polyester film having a thickness of 12 microns was obtained by heat setting at °C. In addition, corona discharge treatment is performed when the contact angle of water to one film is 73~
The test was carried out to the extent that 76 degrees was reduced by 64 to 68 degrees. The contact angle of water was measured with a goniometer type contact angle measuring device Elma G-1 model (manufactured by Elma Optical Instruments Manufacturing Co., Ltd.).

Examples 2 to 4 The same procedure as described in Example 1 was carried out except that when applying the aqueous dispersion using the air knife method, the air pressure was adjusted and the amount of polyester copolymer applied was changed as shown in Table 1. A biaxially stretched coated polyester film was obtained in the same manner as in Example 1.

Examples 5 to 6 A biaxially stretched coating material was prepared in the same manner as in Example 1, except that the copolymer components of the polyester copolymer in the aqueous dispersion were changed as shown in Table 1. I got Telfilm.

Comparative Example 1 A coated polyester film was obtained in the same manner as in Example 1, except that the polyester film was not subjected to corona discharge treatment before applying the aqueous dispersion.

Comparative Examples 2 and 3 In Example 1, a hot water soluble polyester was prepared by adding 10 mol % of IIumnulfoisophthalic acid to the total dicarboxylic acids and changing the blending amount of the polyol component as shown in Table 1. A coated polyester film was obtained in the same manner as in Example 1 except that an aqueous dispersion of the copolymer was used.

Comparative Example 4 In Example 1, methyl methacrylate:ethyl acrylate-1 was used instead of the aqueous dispersion of polyester copolymer.
Coating was carried out in the same manner as in Example 1, except that an acrylic emulsion obtained by emulsion polymerization at a molar ratio of (nigericidyl acrylate: hydroxylethyl methacrylate) k41:41:8:3 was used as the coating liquid. A polyester film was obtained. The emulsion polymerization was carried out using 32% of 1-lium sulfate based on the acrylic monomer as an emulsifier, dodecyl mercaptan as a chain transfer agent, and potassium persulfate as a catalyst.

Comparative Example 5 A polyester film was obtained in the same manner as in Example 1, except that after longitudinal stretching, transverse stretching and heat setting were performed without applying an aqueous dispersion, and then corona discharge treatment was performed.

The formulation, coating amount, and various physical properties of the polyester copolymer components of each of the above Examples and Comparative Examples are shown in Tables 1, 2, and 3 below.
Shown in Table and Table 4.

(Blank below) In Table 1, TPA is equivalent to terephthalic acid, and IPA is Isophthalic acid equivalent.
In terms of t&e, SSI is 5-sodium sulfoisophthalic acid, AA is adipic acid, EG is ethylene glycol, DEG is diethylene glycol, NPG is neopentyl glycol, and I-'EG is polyethylene glycol (average molecular weight 4000).

Table 2 In Table 2, the haze was measured using a haze meter manufactured by Nippon Seimitsu Kogaku Co., Ltd. in accordance with J.K. S-6714. Recycling shows the haze of the recycled film, and the inline coated film fragments and the polyethylene terecrate after polymerization are 1:1.
1 and mix at 280-3o.

The unstretched film was melt-extruded at 60°C, cooled with a cooling roll at 60°C, and then stretched to a thickness of 130 microns. This is a value measured using the above method to measure the haze of a film heat-set in a hot air dryer for 1 minute.

The friction coefficient is a value measured on both coated and uncoated surfaces using Toyo Seiki Co., Ltd.'s Tensilon according to ASTM-1894.

Blocking properties are determined by the coated surface, uncoated surface, and total adhesion sassete 8.
It was cut into 12cm x 12cm pieces, sandwiched between two silicone rubber seals, and further sandwiched between glass plates, and a load of 2kt) was applied from above the glass plate.
The film was left in an atmosphere of R1 for 24 hours, and then the film was removed and the blocking state between the films was visually judged. 5% or less of the blocking area was 0.5 to 20%, and 20% or more was indicated by ×. .

As can be seen in Table 2 above, the haze of the recycled film of the films of each Example was similar to that of the conventional polyethylene terrestrial film (Comparative Example 5) that was not coated with polyethylene ether copolymer, whereas The film coated with an emulsion (Comparative Example 4) is difficult to recycle because the haze of the recycled film deteriorates. Furthermore, the slipperiness of the film is almost the same as that of Comparative Example 5, but the slipperiness of Comparative Example 4 is lower. Furthermore, Comparative Examples 2 and 3 in which the 5-sodium sulfoisophthalic acid component of the polyester copolymerization component was water-soluble had a large blocking property.

In addition, Example 3.4 where the amount of polyester copolymer applied is large.
tends to have strong blocking properties.

(Blank below) Table 3 Table 3 shows the ink adhesion properties.Nitrocellulose-based ink (trade name Cellocolor CC3T, 61 white, 16 red/61 white, manufactured by Toyo Ink Co., Ltd.) and vinyl acetate-based ink are applied to the coated polyester film. Ink (product name Multiset 62 White-3 Red 762 White, manufactured by Toyo Ink Co., Ltd.) and water-based ink (
Each ink (trade name: Aqua Color 39 Indigo, manufactured by Toyo Ink Co., Ltd.) was printed using a gravure printing machine to a coating amount of 2 Vnf (4 f/Ad for red/white), and the tape was removed (a). Scratching (b) and kneading (C) tests were conducted. In the tape peeling test (a), cellophane tape (trade name: L-Pack, manufactured by Nichiban Co., Ltd.) is applied uniformly to the ink-printed surface, then quickly peeled off in 180-degree and 360-degree directions, and the ink remaining on the film is removed. Visually judge the amount and make sure that 95% or more of the total area has remaining ink.
−50 to 95% is indicated by ◯, 10 to 50% is indicated by ◯, and 1.0% or less is indicated by ×. The scratch test (b) shows that almost no ink comes off even if you put your fingernail on the ink surface and rub it sideways.○
The ink does not come off even if you rub it with the back of your fingernail, but the ink does come off if you hold up your nail and rub it sideways. Massage test (C)
Place the ink-printed surfaces on top of each other and press them with the thumbs of both hands, rub them back and forth 20 times, and visually judge whether the ink has peeled off. Significant peeling is indicated by an x.

As seen in Table 3 above, each of the Examples has good ink adhesion, and is particularly superior to the Comparative Example in (a) tape peel test. Comparative Example 1, which was not subjected to corona discharge treatment, had ('b) poor adhesion in the scratch test.

Table 4 Table 4 shows the peel strength when the ink printed surface of Table 3 above is coated with another film.
In the table, for PE extrusion, polyethyleneimine (product name FJL4.20, manufactured by Toyo Morton Co., Ltd.) is anchor-coated on the printed surface of Cerocolor CC3T in Table 3 using a gravure coater, and then low-density polyethylene (product name Sumi Rikisen) is coated with a gravure coater. L70
5-manufactured by Sumitomo Chemical Industries, Ltd.) was extrusion laminated at an extrusion temperature of 300°C. This laminated film was cut into strips with a width of about 15 cm, and a sample was peeled at a 90 degree between the polyester film and the polyethylene film at a tensile speed of 200 mm/min using Toyo Seiki Co., Ltd.'s Tensilon for 3M.
It is a measured value in degrees (ii'/15 mm). CP Dry has the name Keratsuku 971/Takene) A-3 (manufactured by Takeda Pharmaceutical Company) on the printed side of the multi-set in Table 3.
- After anchor-coating with a 9/1 ethyl acetate solution using a gravure coater, a 60 micron thick unstretched polypropylene film (manufactured by Tsuruga Film Co., Ltd.) was dry laminated with a heated roll at 50°C, and this laminated film
After seasoning at 0℃ for 4 days, the same width as above
5. This is the measured value of the 90 degree peel strength of a sample that was severely cut.

0''] Boiling after drying refers to the measured value of 90 degree peel strength similar to the above after the dry laminate film is immersed in hot water at 90°C for 30 minutes.

As seen in Table 4 above, Comparative Example 1 is inferior in both peel strengths.Also, in Comparative Example 13.4, the laminate film peels off when heated with hot water after laminating the polypropylene film, but this Example This shows that the film of the present invention is suitable for food packaging films that require water resistance.

Patent Applicant Toyobo Co., Ltd. Agent Patent Attorney Takeo Sakano Uko Ryo Yoshi Continued from page 10 Inventor Katsuhiko Nose 2-1C-202 Katata, Otsu City 0 Inventor Hajime Suzuki 360-65 Mano-cho, Otsu City Procedural amendment August 9, 1981 1. Indication of the case 1988 Patent Application No. 128456 2. Name of the invention Coated polyester film 3. Person making the amendment Relationship to the case Patent application Person 1+'i Place 2-2-8 Dojimahama, Kita-ku, Osaka Name (316) Toyobo Co., Ltd. 7 Contents of amendment (1) Specification page 14, line 15 〃 Page 14, line 16 "( 49 mol%)" were deleted.

(2) On page 14, line 17 of the Sun Moon Deposit, "103 copies (50 mol%)" was corrected to "140 copies."

(3) Specification @ page 14, line 18 "58 parts (50 mol%)" was corrected to "44 parts."

(4) Akira! I] Ancient 20th page, line 1 ``It is.Following J, the following - Bunzen joins.

"Also, the mol% of dicarboxylic acids and polyols in Table 1 are the values measured by nuclear magnetic resonance Nuvector." (5) Specification, page 22, lines 7-8 (-Same, but Comparative Example 4 is a slip sexuality is declining.”
t Corrected to "They are the same."

Procedural Amendment (Second) Kazuo Wakasugi, Commissioner of the Patent Office (Examiner of the Patent Office) 1. Indication of the case Patent Application No. 128456 of 1982 2. Name of the invention Coated polyester film 3. Case of the person making the amendment Relationship with Patent Applicant Residence 2-2-8 Dojimahama, Kita-ku, Osaka Name (81)
6) Toyobo Co., Ltd. 6, subject of amendment Contents of amendment in Column 7 of the details of the invention in the specification (1) Description section, page 16, line 17, "Examples 5-6" changed to "Examples 5-6" Corrected to 5-7.

(2) Lines 1-14 of page 19 of the specification tube Table 1 was corrected as shown in the attached sheet (Example 7 added).

(3) Lines 2 to 15, page 20 of the specification tube Table 2 was corrected as shown in the attached sheet (Example 7 added).

(4) Specification Section, page 23, lines 1-15 Table 3 was corrected as shown in the attached sheet (addition of Example 7).

(5) Specification Section, page 25, lines 9-22 Table 4 was corrected as shown in the attached sheet (Example 7 added).

Attachment Table 2 Table 3 Table 4

Claims (1)

[Scope of Claims] [1] At least one side of an extruded unstretched polyester film or uniaxially stretched polyester film is subjected to corona discharge treatment, and this treated side is subjected to corona discharge treatment. France) Water-insoluble polyester co-ffi combination consisting of a mixed dicarboxylic acid containing 0.5 to 7 mol % of sulfonic acid metal base-containing dicarboxylic acid to the total dicarboxylic acid component, 03
) water-soluble organic compound J with a boiling point of 60 to 200°C and (
C>consists of water, (Al/(B)=100/20~
5000. ■ A method for producing a coated polyester film characterized by applying an aqueous dispersion of polyester resin blended in a weight ratio of 100150 to 10000, and then further biaxially or uniaxially stretching the coated film. . (2'l Polyester film Kapolyethylene terephthalate 1-film N'
Method for producing l+ coated polyester film.