JP3212829B2 - OHP film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OHP (overhead projector) film and, more particularly, to an OHP film comprising a polyester film and an antistatic lubricating film laminated on the polyester film.
For film.

[0002]

2. Description of the Related Art Polyester films, particularly polyester films using polyethylene terephthalate or polyethylene naphthalate, are widely used as magnetic recording materials, packaging materials, graphic materials and the like, and are also used as OHP films.

[0003] Such a polyester film is easily charged, and has the drawback that the charged films are in close contact with each other and are hardly peeled off. In order to remedy this drawback, for example, a method has been proposed and put to practical use in which an antistatic coating containing a low molecular weight antistatic agent or a high molecular weight antistatic agent is applied to the surface of a polyester film to reduce the charge of the film. ing.

As the low molecular weight antistatic agent, for example, a surfactant type anionic antistatic agent such as a long chain alkyl compound having a sulfonate group (JP-A-4-28728) is known. The polymer type antistatic agent includes a polymer having an ionized nitrogen element in the main chain (JP-A-3-255139, JP-A-Hei.
-288127, JP-A-6-172562) and sulfonate-modified polystyrene (JP-A-5-3).
No. 20390) is known.

[0005] However, in a polyester film in which an antistatic coating film using such a low-molecular type antistatic agent is laminated, the antistatic agent moves in the coating film while the film is wound in a roll and stored. And the adhesion of the antistatic agent accumulated on the coating surface to a part of the film is transferred to the adjacent film surface, reducing the adhesiveness of the film surface.For example, the toner of a copying machine adheres to the film surface. There is a problem that is difficult to perform. In addition, since the coefficient of friction of the surface of the antistatic coating film is large, the slipperiness between the films deteriorates.For example, when a plurality of films are continuously supplied to a copying machine one by one, the film is supplied in a state where a plurality of films are stacked. Will be done (double feed)
Problems arise.

On the other hand, in a polyester film in which an antistatic film using a polymer type antistatic agent is laminated, a large amount of an antistatic agent is blended in order to improve the antistatic property. It is not economical because it is necessary to form a thick antistatic coating film, and it also collects scrap film that does not become a product (for example, the end of a film that has been cut and removed from the product) and recycles it for film production. When used as, the coating film component contained in the recycled material during the melt film formation is thermally degraded,
There is a problem that the obtained film is remarkably colored and lacks practicality (recoverability is poor).

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, to reduce the coefficient of friction between films, and to reduce the charge caused by friction and peeling between films, thereby conveying the film. An object of the present invention is to provide an OHP film having improved handling properties such as properties.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to provide, according to the present invention, at least one side of a polyester film,
Structural unit (i) represented by the following formula (I): 60 to 98 mol%, structural unit (ii) represented by the following formula (II): 0 to 25 mol%, and structural unit represented by the following formula (III) (iii) ) 1-1
5 to 85% by weight of copolymer (A), 8 to 30% by weight of fine particles (B) having an average particle size of 40 to 800 nm, and 4 to 15% by weight of bisamide compound (C) having 15 to 60 carbon atoms. %, Surfactant (D) 3 to 25% by weight and at least one kind of binder resin (E) 0 selected from the group consisting of polyester resin, acrylic resin and acrylic-modified polyester resin having a secondary transition point of 30 to 90 ° C. OH provided with an antistatic lubricious coating film formed by applying an aqueous coating solution containing a composition consisting of
Achieved by P film.

[0009]

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[0010]

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[In the formula (II), R ¹ and R ² are H or C
H ₃ ; X is a saturated hydrocarbon group having 1 to 6 carbon atoms]

[0012]

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[In the formula (III), R ¹ and R ² are H or CH
_3; R ³ is a carbon number 2-10 alkylene group; R ^4,
R ^5, R ⁶ is a saturated hydrocarbon radical H or carbons 1-5; R ⁷ represents a saturated hydrocarbon group having 1 to 5 carbon atoms. ]
Hereinafter, the present invention will be described in detail.

[Base Film] In the present invention, a polyester film is used for the base film. The polyester constituting the base film is a linear polyester comprising a dicarboxylic acid component and a glycol component.

Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, hexahydroterephthalic acid, 4,4'-diphenyldicarboxylic acid, adipic acid, sebacic acid and dodecanedicarboxylic acid. Among them, terephthalic acid and 2,6-naphthalenedicarboxylic acid are particularly preferred.

Examples of the glycol component include ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, cyclohexanedimethanol, and polyethylene glycol. And the like, and ethylene glycol is particularly preferred.

Of these polyesters, homopolymers of polyethylene terephthalate or polyethylene-2,6-naphthalate have excellent mechanical properties such as high Young's modulus and good thermal properties such as good heat resistance dimensional stability. It is preferable because an excellent film can be obtained.

The above-mentioned polyester may be a polyester obtained by copolymerizing the above-mentioned dicarboxylic acid component or glycol component in order to improve the adhesiveness between the polyester film and the coating film. A polyester obtained by copolymerizing a small amount of the above polyvalent compound in a range in which the polyester becomes substantially linear (for example, 5 mol% or less) may be used.

Such a polyester can be produced by a conventional method. Further, the intrinsic viscosity of the polyester is 0.45
The above is preferable because the mechanical properties such as high rigidity of the film are improved.

The above polyester has an average particle size of 0.1 as a lubricant in order to improve the slipperiness of the film.
It is preferable to contain organic or inorganic fine particles having a particle size of about 01 to 20 μm, for example, in a mixing ratio of 0.005 to 20% by weight. Specific examples of such fine particles include silica, alumina, kaolin, calcium carbonate, calcium oxide, titanium oxide, graphite, carbon black, zinc oxide, silicon carbide, tin oxide, crosslinked acrylic resin particles, crosslinked polystyrene resin particles, melamine resin particles, Preferable examples include crosslinked silicone resin particles.

In addition to the fine particles, antioxidants, known antistatic agents, organic lubricants (slip agents), catalysts, colorants, pigments,
A fluorescent whitening agent, a plasticizer, a crosslinking agent, an ultraviolet absorber, other resins, and the like can be added as needed.

In the present invention, the film to which the aqueous coating solution is applied is a film which can be stretched after the application of the aqueous coating solution. As such a film, an unstretched film, a uniaxially stretched film or a stretchable biaxially stretched film is used. Can be used. Such a film can be obtained by a conventionally known method. For example, an unstretched film can be obtained by melting the polyester with an extruder and extruding the film into a film shape, and cooling the film with a rotary cooling drum.The unstretched film is uniaxially stretched in the machine direction or the transverse direction. A uniaxially stretched film can be obtained. In addition, the stretchable biaxially stretched film is a method of sequentially biaxially stretching a uniaxially stretched film in a longitudinal direction or a transverse direction in a transverse direction or a longitudinal direction, or simultaneously biaxially stretching an unstretched film in a longitudinal direction and a transverse direction. Can be obtained in a way.

The above-mentioned stretching temperature is preferably not lower than the secondary transition point (Tg) of the polyester. The stretching ratio is 2 to 8 times in the uniaxial direction for a uniaxially stretched film, and 2 to 8 times in each direction for a biaxially stretchable film that can be stretched.
It is preferable that the ratio be 2 times, especially 2 to 6 times.

[Copolymer (A)] The copolymer (A) according to the present invention comprises the structural unit (i) 6 represented by the above formula (I).
0 to 98 mol% of the structural unit (i) represented by the formula (II)
i) a copolymer of 0 to 25 mol% and the structural unit (iii) of 1 to 15 mol% represented by the formula (III), wherein the structural unit (i) is 80 to 95 mol% and the structural unit (ii) Is 2 to 15
When the mole% and the structural unit (iii) are 2 to 10 mole%, O
It is preferable because the antistatic property and the recoverability of the HP film are more excellent.

The structural unit (i) is a unit obtained by using ethylene as a monomer, and the structural unit (ii) is, for example, methyl methacrylate, ethyl methacrylate, ethyl acrylate, methyl acrylate as a monomer. And a unit obtained by using an acrylic acid monomer such as butyl acrylate. The structural unit (iii) is, for example, an acrylic acid component of an ethylene / acrylic acid copolymer or an ethylene / acrylic acid / acrylic ester (methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, etc.) copolymer A part or all of the methacrylic acid component of the ethylene / methacrylic acid copolymer or the ethylene / methacrylic acid / methacrylic acid ester copolymer, an ethylene / crotonic acid copolymer or ethylene / methacrylic acid copolymer
The copolymer is obtained by reacting a part or all of the crotonic acid component of the crotonic acid / crotonic acid ester copolymer with N, N-dialkylaminoalkylamine to amidate and then performing a quaternary alkylation reaction. It can be introduced as a component of (A).

The average molecular weight of the copolymer (A) is 2,
It is preferably from 000 to 50,000. If the average molecular weight is less than 2,000, the heat resistance of the film may be insufficient, and if it exceeds 50,000, the water dispersibility in the aqueous coating solution may be poor.

[Fine Particles (B)] The fine particles (B) in the present invention have an average particle size of 40 to 800 nm.
Particularly, those having an average particle size of 50 to 700 nm are preferable.
When the average particle size is less than 40 nm, the transportability of the OHP film is insufficient, and when it exceeds 800 nm, the coating film is easily shaved. The fine particles (B) are fine particles having the above-mentioned particle size in the coating film. For example, inorganic fine particles such as silica, alumina, titanium oxide, calcium carbonate, kaolin, and carbon black, a crosslinked polystyrene resin, a crosslinked acrylic resin, Organic fine particles such as a melamine resin, a silicone resin, a fluorine resin, a urea resin, a benzoguanamine resin, and a polyamide resin can be given. Examples of the organic fine particles include fine particles of a thermosetting resin, a thermoplastic resin, a crosslinked thermoplastic resin, and the like, and the degree of crosslinking of the crosslinked thermoplastic resin can be freely adjusted according to the purpose.

[Bisamide compound (C)] The bisamide compound (C) in the present invention is a bisamide compound having 15 to 60 carbon atoms, and examples thereof include the following alkylenebisalkylamides.

[0029]

Embedded image C ₁₅ H ₃₁ CONHCH ₂ CH ₂ NHCOC ₁₅ H ₃₁ C ₁₈ H ₃₇ CONHCH ₂ CH ₂ NHCOC ₁₈ H ₃₇ C ₁₈ H ₃₇ CONH (CH ₂ ) ₆ NHCOC ₁₈ H ₃₇ C ₂₁ H ₄₃ CONHCH ₂ CH ₂ NHCOC ₂₁ H _{43 When the} number of carbon atoms of the bisamide compound (C) is less than 15, the slip property of the coating film is insufficient, and the bisamide compound (C) is liable to bleed from the coating film having more than 60, which is not preferable.

[Surfactant (D)] As the surfactant (D) in the present invention, a nonionic, cationic or anionic surfactant can be used, and among these, a nonionic surfactant is used. Agents are preferred. Examples of the surfactant (D) include alkylphenol / alkylene oxide adducts, alkylene oxide copolymers, polyol / long chain fatty acid esters, polyolamines, sulfonates of alcohol / alkylene oxide adducts,
And a quaternary ammonium base-containing compound.

[Binder Resin (E)] The binder resin (E) in the present invention is at least one selected from the group consisting of polyester resins, acrylic resins and acrylic-modified polyester resins having a secondary transition point of 30 to 90 ° C. Resin. These resins can be used alone or in combination of two or more. The secondary transition point of the binder resin (E) is 30 to 90 ° C. When the secondary transition point is lower than 30 ° C, the film is easily blocked,
If it exceeds, the coating film is easily scraped and the transparency is insufficient, so that it is not preferable. It is preferable that the secondary transition point is from 40 to 80 ° C., because the blocking resistance and transparency of the film are further improved.

[Polyester Resin] The above polyester resin is soluble in water formed from a dicarboxylic acid component and a glycol component or emulsified or dispersible in water, and has a secondary transition point of 30 to 90 ° C. (preferably 40 to 90 ° C.). -80 ° C). Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, adipic acid, sebacic acid, dodecanedicarboxylic acid, hexahydroterephthalic acid, and phenylindanedicarboxylic acid. be able to. Examples of the glycol component include ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, and dipropylene. Glycol, triethylene glycol, bisphenol A-alkylene oxide adduct, hydrogenated bisphenol A-alkylene oxide adduct, polyerylene glycol and the like can be mentioned.

The copolymerized polyester having a secondary transition point of 30 to 90 ° C. uses an aromatic dicarboxylic acid as a main component as a dicarboxylic acid component, and selects a glycol component such that the secondary transition point falls within the above range. Can be obtained by

[0034] In order to improve the aqueous conversion of the polyester resin in the aqueous coating solution, a component having a sulfonate group can be used as a copolymerization component. Examples of the component having a sulfonate group include 5-Na sulfoisophthalic acid, 5-K sulfoisophthalic acid, 5-tributylphosphonium sulfoisophthalic acid, 1-Na
Examples include sulfosuccinic acid and 3,3′-di-K sulfobisphenol A ethylene oxide adduct.

[Acrylic resin] The acrylic resin is
A copolymer having a secondary transition point of 30 to 90 ° C (preferably 40 to 80 ° C) obtained by polymerizing two or more acrylic monomers. Examples of the acrylic monomer include methyl methacrylate, ethyl methacrylate, ethyl acrylate, methyl acrylate, butyl acrylate, acrylonitrile, acrylic acid, acrylamide, N-methylolacrylamide, glycidyl methacrylate, and 2-hydroxy. Ethyl acrylate and the like can be mentioned.
The acrylic resin may be a copolymer of a monomer other than an acrylic monomer such as vinyl acetate, vinyl chloride, and styrene. The part may be a crosslinked resin.

The acrylic resin having a secondary transition point of 30 to 90 ° C. uses a hard component such as methyl methacrylate or ethyl methacrylate as a main component and a soft component such as an acrylate as a copolymer component. It can be obtained by copolymerizing the secondary transition point at a ratio within the above range. Further, the secondary transition point of the acrylic resin can be adjusted by using a component having a methylol group, a methoxymethyl group, or the like as a copolymerization component and crosslinking these groups.

[Acrylic-Modified Polyester Resin] The above-mentioned acrylic-modified polyester resin has a secondary transition point of 30 to 90 in which a polyester chain and an acrylic polymer chain are bonded.
C. (preferably 40 to 80 C.), and can be obtained by, for example, graft copolymerizing the acrylic monomer in the presence of the polyester resin.

The acrylic-modified polyester resin having a secondary transition point of 30 to 90 ° C. is different from a copolymerized polyester having a secondary transition point of 20 to 100 ° C. in that a hard component such as methyl methacrylate or ethyl methacrylate is mixed with an acrylic resin. It can be obtained by copolymerizing a soft component such as an acid ester at a ratio at which the secondary transition point of the acrylic-modified polyester resin is 30 to 90 ° C.

[Other Resins] In the binder resin (E), polyurethane resin, epoxy resin, vinyl resin, polyether resin, water-soluble resin or the like is used in a small amount (for example, 10% by weight or less as the binder resin). Can be blended.

[Electrostatic Anti-Slip Coating] The anti-static anti-slip coating of the present invention comprises 20 to 85% by weight of the copolymer (A) and the fine particles (B) 8 on at least one surface of the polyester film.
An aqueous coating liquid containing a composition consisting of -30% by weight, a bisamide compound (C) 4-15% by weight, a surfactant (D) 3-25% by weight and a binder resin (E) 0-65% by weight is applied. , Dried and stretched.

In this composition, the proportion of the copolymer (A) is from 20 to 85% by weight, preferably from 25 to 70% by weight. 20% by weight of copolymer (A)
If it is less than 80%, the antistatic property of the film is insufficient, and if it exceeds 85%, the slipperiness is insufficient.

The proportion of the fine particles (B) is 8 to 30% by weight, preferably 10 to 20% by weight.
If the ratio of the fine particles (B) is less than 8% by weight, the film has insufficient slipperiness, and if it exceeds 30% by weight, the coating film is easily shaved.

The ratio of the bisamide compound (C) is 4 to 15
% By weight, but preferably 5 to 12% by weight.
If the ratio of the bisamide compound (C) is less than 4% by weight, the film has insufficient slipperiness, and if it exceeds 15% by weight, it tends to stick.

The ratio of the surfactant (D) is 3 to 25% by weight.
However, it is preferably 5 to 15% by weight. If the proportion of the surfactant (D) is less than 3% by weight, the coatability of the aqueous liquid is reduced, and if it exceeds 25%, the coating film tends to be blocked.

The proportion of the binder resin (E) is from 0 to 65% by weight, preferably from 5 to 60% by weight.
When the proportion of the binder resin (E) exceeds 65% by weight, the film transportability is reduced. When the content is less than 5% by weight, the coating film may be easily scraped.

The thickness of the antistatic lubricating coating film is 0.01 to
It is preferably 0.5 μm, particularly preferably 0.015 to 0.2 μm. If the thickness of the coating film is less than 0.01 μm, the antistatic effect may be insufficient, and if it exceeds 0.5 μm, the coating film surface may be rough or the coating film may be easily shaved, which is not preferable.

In addition, the non-coated surface of the polyester film and the antistatic lubricating coated surface or the antistatic lubricating coated film surfaces
It is preferable that the coefficient of static friction under a load of 1 kg is from 0.1 to 0.6, particularly from 0.15 to 0.55, because the film winding property and the transport property of the OHP film are improved.

The thickness of the coated polyester film is preferably from 20 to 200 μm because the film rigidity and handleability when used as an OHP film are good. Preferably, the ratio is 65% or more.

[Aqueous coating liquid] In the present invention, an aqueous coating liquid containing the above-mentioned composition is used in order to coat an antistatic lubricating coating film on a base film. This aqueous coating liquid is preferably an aqueous solution, emulsion, dispersion or the like of the modified copolymer.

Further, in addition to the above components, the aqueous coating liquid may contain an antioxidant, another antistatic agent, a coloring agent, a pigment, a fluorescent whitening agent, a plasticizer, a crosslinking agent, a slipping agent (lubricating agent), and an ultraviolet absorber. Etc. can be added.

The total solid content in the aqueous coating solution is preferably 1 to 30% by weight, more preferably 2 to 20% by weight. The aqueous coating liquid may contain a small amount of an organic solvent.

[Application of Coating Film] In the present invention, the above-mentioned aqueous coating solution is applied to at least one side of the polyester film, and the coating film is applied by heating, drying and stretching. As the method, any known coating method can be applied, for example, gravure coating, reverse roll coating, die coating, kiss coating, reverse kiss coating, offset gravure coating, Meyer bar coating, roll brushing, spraying A coating method, an air knife coating method, an impregnation method, a curtain coating method and the like can be applied alone or in combination. The WET application amount of the aqueous coating solution is 1 to 1 m ² of the running film.
20 g, especially 2 to 12 g, is preferred. It is preferable that the coating amount be in this range, since drying becomes easy and coating unevenness hardly occurs.

In the present invention, the above-mentioned unstretched film, uniaxially stretched film or stretchable biaxially stretched film can be used as the polyester film to be coated with the aqueous coating solution. The use of a uniaxially stretched film in the direction is preferable because the coating film has good abrasion resistance and can efficiently produce a laminated film. For example, polyester is hot melted by an extruder, extruded into a sheet and cooled to form an unstretched film,
This unstretched film is stretched 2 to 8 times in the machine direction to form a uniaxially stretched film, then coated with an aqueous liquid, dried by heating, and then stretched 2 to 9 times in the transverse direction. By re-stretching and / or heat-treating in the transverse direction, a laminated film having good abrasion resistance of the coating film can be produced.

[Drying and Stretching Temperature] After applying the aqueous coating liquid in the present invention, the drying temperature is preferably from 70 to 120 ° C., since the coating liquid can be dried quickly, and thus it is preferable. The heating for drying can also serve as the heating in the process of stretching the polyester film. The stretching temperature of the polyester film can be 80 to 170 ° C, and the heat treatment temperature can be 120 to 260 ° C.

[0055]

The present invention will be described in more detail with reference to the following examples. Each characteristic value was measured by the following method. The average molecular weight indicates a number average molecular weight.

1. Surface specific resistance The coated surface of the film (in Comparative Example 1, one side of the film)
With a surface specific resistance value of 23 ° C. and 55% RH, a vibration capacitance type potentiometer (TR-84M, manufactured by Takeda Riken Co., Ltd.)
(Type machine).

2. Coefficient of friction Coated surfaces of the films were compared with each other (uncoated surfaces of the film in Comparative Example 1), and a load of 1 was measured using a friction coefficient measuring device.
The coefficient of static friction when kg was added was measured.

3. Transportability 100 sheets of the film cut to A4 size were set in a copying machine (U-Bix4060 type machine manufactured by Konica Corporation), and the number of times of double feeding when the film was continuously supplied was measured.

4. Recoverability A polyester film without a coating film (the film of Comparative Example 1) was pulverized, melted and held at 300 ° C. for 25 minutes in a nitrogen atmosphere, and then the molten polymer was transferred onto a cooling metal plate and rapidly cooled to obtain a disk. -Shaped blank sample. On the other hand, a disc-shaped sample for evaluating the degree of coloring was prepared in the same manner as described above, using a laminated film provided with a coating film. The coloring degree of the disc-shaped sample was compared with the coloring degree of the blank sample, and the film recoverability was evaluated according to the following criteria. Rank A: Light yellow with a degree of coloring comparable to that of the blank sample (good recoverability) Rank B: Light yellow with a degree of coloring that is stronger than the blank sample (slightly better recoverability) Rank C: Yellow with an extremely strong coloring degree than the blank sample ( Poor recoverability)

5. Light transmittance Light transmittance measuring device (HR-1 manufactured by Murakami Color Research Laboratory)
00 type machine).

Example 1 A polyethylene terephthalate having an intrinsic viscosity of 0.65 was melted by an extruder, and a film-like molten polymer was extruded from a die onto a cooling drum, rapidly cooled to obtain an unstretched film. 9 films
The film was stretched 3.4 times in the machine direction at 1 ° C. to obtain a uniaxially stretched film. On both sides of the uniaxially stretched film, acidic components are terephthalic acid (48 mol%), isophthalic acid (46 mol%), 2,6-naphthalenedicarboxylic acid (6 mol%), and glycol component is ethylene glycol (56 mol%). , Neopentyl glycol (23 mol%), diethylene glycol (17 mol%), 1,4-cyclohexanedimethanol (2 mol%) and polyethylene glycol (2 mol%) polyester resin (E-1, Tg 52 ° C, average molecular weight) = 2,500) 6% by weight, ethyl methacrylate (69 mol%), butyl methacrylate (3 mol%), glycidyl methacrylate (5 mol%), ethyl acrylate (10 mol%), 2-hydroxy acrylate Ethyl (1
1 mol%) and an acrylic resin (R-1, Tg54) obtained using N-methylol acrylamide (2 mol%).
° C, average molecular weight = 72,800) 28% by weight, 12% by weight of silica fine particles having an average particle size of 162 nm, and an average particle size of 6%.
5% by weight of 6 nm crosslinked polystyrene resin fine particles, 86% by mole of an ethylene component, 7% by mole of an ethyl acrylate component, and a component represented by the following formula (III-1) (—CH ₂ CH—
[(CONH) (CH ₂ ) ₃ N ⁺ (CH ₃ ) ₃ ] [CH
₃ SO ₃ ^-]) 7 mol% of the copolymer (A) (A-1, average molecular weight 6,900) 31 wt% of ethylene bis-stearyl amide 8 wt% and ethylene oxide-propylene oxide copolymer (average molecular weight 9 , 200) A 4% by weight aqueous coating solution having a composition of 10% by weight was applied using a gravure coater. Next, after drying at 102 ° C, the film was stretched 3.9 times in the transverse direction at 104 ° C, and heat-treated at 219 ° C to obtain a total thickness of 1
02 μm, coating thickness 0.048 μm, light transmittance 82%
Was obtained. Table 2 shows the characteristics of this film.

[0062]

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[Examples 2 to 8 and Comparative Examples 1 to 3] Types of polyester resin, acrylic resin and copolymer (A)
A laminated film was obtained in the same manner as in Example 1 except that the mixing ratio and the coating film thickness were changed as shown in Table 1. Table 2 shows the characteristics of these films.

[0064]

[Table 1]

[0065]

[Table 2]

In Table 1, [R-2] and [A-2] represent the following polymers. [R-2]: Methyl methacrylate (72 mol%), butyl methacrylate (3 mol%), glycidyl methacrylate (4 mol%), methyl acrylate (8 mol%), 2-hydroxyethyl acrylate (10 mol%) Mol%) and a copolymer obtained using N-methoxymethylacrylamide (3 mol%) (Tg: 58 ° C, average molecular weight: 57,90).
0) [A-2]: a polymer of a repeating unit represented by the following formula (IV-1) (average molecular weight: 18,340)

[0067]

Embedded image

[0068]

According to the present invention, since the antistatic lubricating coating film having a specific composition is used, the coefficient of friction between the films can be reduced, and the charge generated by the friction and peeling between the films can be reduced. An OHP film having improved handling properties such as transportability can be provided.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 27/00-27/42 C08J 7/04

Claims (2)

(57) [Claims] 1. Structural units (i) 60 to 98 represented by the following formula (I) are provided on at least one surface of a polyester film.
Mol%, structural unit (ii) represented by the following formula (II): 0 to 2
5 mol% and a structural unit (iii) 1 represented by the following formula (III):
20 to 85% by weight of a copolymer (A) of 15 to 15% by mole, 8 to 30% by weight of fine particles (B) having an average particle diameter of 40 to 800 nm, and a bisamide compound (C) having a carbon number of 15 to 60
15% by weight, 3 to 25% by weight of a surfactant (D) and at least one binder resin (E) having a secondary transition point of 30 to 90 ° C. selected from the group consisting of polyester resins, acrylic resins and acrylic-modified polyester resins. ) 0
An OHP film provided with an antistatic lubricious coating film formed by applying an aqueous coating liquid containing a composition comprising 65% by weight, drying and stretching. Embedded image Embedded image [In the formula (II), R ¹ and R ² are H or CH ₃ ; X is a saturated hydrocarbon group having 1 to 6 carbon atoms.] [In the formula (III), R ¹ and R ² are H or CH ₃ ; R ³ is an alkylene group having 2 to 10 carbon atoms; R ⁴ , R ⁵ and R ⁶ are H or saturated carbon atoms having 1 to 5 carbon atoms. A hydrogen group; R ⁷ represents a saturated hydrocarbon group having 1 to 5 carbon atoms. ] 2. A polyester film having a thickness of 20 to 200 μm, and having a thickness of 0.01 to 0.5
A μm antistatic lubricating coating film is provided, and the static friction coefficient under a 1 kg load between the polyester film surface and the antistatic lubricating coating film surface or the antistatic lubricating slip coating film surface is 0.1 to 0.1%.
2. The OHP film according to claim 1, wherein the ratio is 0.6.