JPH0781017A - Laminated polyester film - Google Patents

Abstract

PURPOSE:To obtain excellent running property without causing sticking, eliminate repellency at inking, and reduce contamination and abrasion of a head in a thermal printer of a considerably wide range by making a laminated polyester film of a base material film of thermal transfer material and providing an ink layer on the face opposite to the laminated face. CONSTITUTION:In a laminated polyester film, a laminated film is provided, on at least one face of a polyester film, with a laminated membrane having as principal components a wax composition and a phosphoric acid ester and/or amino acid ester. In the laminated film, the content of the phosphoric acid ester and/or amino acid ester in the laminated membrane is 0.5-80wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated polyester film, and more particularly to a laminated polyester film suitable as a base film for a thermal transfer material.

[0002]

2. Description of the Related Art In recent years, various recording systems have been developed with the development of office automation. Among them, a thermal recording system which produces less noise during printing and is easy to operate is noted. Has been done. In the thermal recording method, a thermal printer such as a thermal printer is used to bring the recording paper into contact with the thermal ink layer of the thermal transfer material, and the film is selectively heated by a pulse signal from the heating head on the opposite side of the ink layer. .
As a result, the ink heated through the film is melted or sublimated and transferred to the recording paper. As the heat-sensitive transfer material, a thin-film plastic film is generally used in order to improve the heat efficiency.

However, in general, when a plastic film is used as a base film of a heat-sensitive transfer material, a phenomenon occurs in which the film partially fuses to the thermal head due to the amount of heat given by the thermal head. This phenomenon is called a stick phenomenon, and when this phenomenon occurs, not only the thermal transfer material does not smoothly run, but also the thermal head is significantly contaminated and the sharpness of printing is impaired. In order to avoid this sticking phenomenon, it has been proposed to apply various surface treatments to the surface of the plastic film that comes into contact with the thermal head. For example silicon
With a heat-resistant protective layer of melamine, melamine, phenol, epoxy, polyimide, etc. (JP-A-55-7467), with an anti-stick layer made of a highly slippery inorganic pigment and a highly heat-resistant resin There is one (JP-A-56-1)
55794). Further, a layer comprising a water-soluble or water-dispersible silicone and a resin is provided (Japanese Patent Laid-Open No. Sho 60).
No. 192628), a layer comprising a water-dispersible fluororesin and an aqueous polymer is provided (JP-A-60-19226).
No. 30), wax and / or a liquid or paste-like substance applied or transferred at room temperature (JP-A-59-148697 and JP-A-60-56583).

[0004]

However, since the one provided with the heat-resistant protective layer is insufficient in slipping with the head, the runnability of the thermal transfer ribbon is poor in a printer having a low pulse width or a platen drive type printer. However, there is a drawback that the printing stops in the extreme cases such as uneven printing and extreme cases. Further, the one to which an inorganic pigment is added has a problem that the life of the head is shortened due to friction with the thermal head, or the surface is roughened so that the thermal conductivity is poor and clear printing cannot be obtained. Those laminated with silicone resin and fluorine resin are
Transfer of these resins to the surface to which the ink is applied after being wound on a roll is likely to occur, which causes problems such as repellency during ink application and poor ink adhesion. The laminated film obtained by applying wax etc. to a plastic film and drying it has excellent lubrication with the thermal head, but it does not slide well with the fixed shaft of the printer, resulting in sticking. It had the drawback of Particularly in recent years, thermal transfer printers have
The printing speed tends to be further increased, and development of a heat-sensitive transfer material capable of coping with this is desired.

An object of the present invention is one which does not have the above-mentioned drawbacks, that is, no stick is generated, such as from a low pulse width region such as a word processor, a facsimile, a bar code printer to a video printer. It has good runnability in a wide range up to the high pulse width range, has very little head wear and head contamination, has no repellency during ink application, and has excellent ink adhesion and printing clarity. It is intended to provide a laminated polyester film suitable as a base film for a material.

[0006]

The present invention is a laminated film having a wax-based composition and a laminated film containing a phosphoric acid ester and / or an amino acid ester as a main component on at least one surface of a polyester film. The main point is a laminated polyester film characterized in that the content of phosphoric acid ester and / or amino acid ester in the film is 0.5 to 80% by weight.

The polyester film referred to in the present invention is a general term for a polymer film having an ester bond as a main bonding chain of its main chain, and polyethylene terephthalate is particularly preferable as a base film for a thermal transfer material, Films such as polyethylene 2,6-naphthalate, polyethylene α, β-bis (2-chlorophenoxy) ethane 4,4, -dicarboxylate, polybutylene terephthalate, and the like, among which quality and economical efficiency Polyethylene terephthalate film is most preferable in consideration of the above. Therefore, hereinafter, the description will proceed with polyethylene terephthalate film (hereinafter, polyethylene terephthalate film is abbreviated as PET film) as a representative example of polyester film.

Here, polyethylene terephthalate means
Although 80 mol% or more, preferably 90 mol% or more, more preferably 95 mol% or more, has ethylene terephthalate as a repeating unit, a part of the acid component and the glycol component is as follows. It may be replaced with the third component.

-Acid component-Isophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,
5-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 4,4
′ -Diphenylsulfone dicarboxylic acid, 4,4′-diphenyl ether dicarboxylic acid, p-β-hydroxyethoxybenzoic acid, adipic acid, azelaic acid, sebacic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, ε-oxy Caproic acid, trimellitic acid, trimesic acid, pyromellitic acid, α, β-bisphenoxyethane-4,4′-dicarboxylic acid, α, β-bis (2-chlorophenoxy) ethane-4,4′-dicarboxylic acid 5,
-Sodium sulfoisophthalic acid etc.

-Glycol component-Propylene glycol, butylene glycol, hexamethylene glycol, decamethylene glycol, neopentylene glycol, 1,4-cyclohexane dimethano-
2,2-bis (4-β-hydroxyethoxyphenyl) propane, bis (4-β-hydroxyethoxyphenyl) sulfone, diethylene glycol, triethylene glycol, pentaerythritol, trimethylolpropane, Polyethylene glycol, polytetramethylene glycol, etc.

Further, known additives such as heat resistance stabilizer, oxidation resistance stabilizer, weather resistance stabilizer, ultraviolet absorber, organic slippery agent, pigment, dye, organic or inorganic fine particles, and filler are contained in this PET. , An antistatic agent, a nucleating agent and the like may be added.
In particular, inorganic and / or organic fine particles are added, and the average surface roughness of the PET film after biaxial orientation is 0.03.
˜0.4 μm, preferably 0.05 to 0.2 μm, the running property of the present invention can be further improved. In addition, it is preferable to add an organic slippery agent, for example, a wax component to the base polyester because the sticking property can be further improved.

The PET has an intrinsic viscosity (measured in orthochlorophenol at 25 ° C.) of 0.40 to 1.20 dl /
g, preferably 0.50 to 0.80 dl / g, and more preferably 0.5 to 0.75 dl / g are suitable for the present invention.

The PET film is preferably biaxially oriented in terms of mechanical strength and dimensional stability. Biaxially oriented PE
The T film (hereinafter abbreviated as PET-BO) is a PET sheet in a non-stretched state that is stretched in the so-called biaxial direction in the longitudinal direction and the width direction by about 2.5 to 5.0 times, and further heated. It is made by fixing and completing the crystal orientation.
Wide-angle X-ray diffraction indicates a biaxially oriented pattern.

Although the thickness of PET-BO is not particularly limited,
When the laminated polyester film of the present invention is used as a base film for a thermal transfer material, it is 0.5 μm or more and 30 μm or more.
m or less, preferably 1 μm or more and 10 μm or less is preferable from the viewpoint of heat transfer property and mechanical strength.

When a polyester resin having a glass transition point higher than that of PET is laminated on at least one side of this PET film and stretched, wrinkles of the film due to printing energy are less likely to occur, and therefore printing is performed. Is excellent in sharpness and is particularly preferable. This stack is preferably provided on the side in contact with the thermal head. Such P
Polyethylene-2,6-naphthalate is a typical polyester having a glass transition point higher than that of ET.

The present invention is a laminated film having a laminated film containing a mixture of a wax composition and a phosphoric acid ester and / or an amino acid ester as a main component on at least one surface of the above polyester film. The main component here is
It means that the weight ratio in the laminated composition is 50% or more, preferably 60% or more.

As the wax compound, various commercially available waxes such as petroleum wax, plant wax, mineral wax, animal wax, low molecular weight polyolefins and the like can be used, and are not particularly limited. However, in the present invention, the use of petroleum wax and plant wax is preferable from the viewpoint of stick resistance.

Examples of petroleum waxes include paraffin wax, microcrystalline wax, and oxidized wax. Among them, the use of oxidized wax is particularly preferable from the viewpoint of protrusion formation for imparting slipperiness.

As the vegetable wax, candelilla wax, carnauba wax, wooden wax, oricure wax.
Examples thereof include re-wax, sugar cane wax, and rosin-modified wax. In the present invention, compositions comprising the following compounds are particularly preferable. That is, {rosin or disproportionated rosin, or hydrogenated rosin. Α, β-substituted ethylene (α-substituent :: carboxyl, β-substituent: hydrogen or methyl or carboxyl) adduct} ・ alkyl or alkenyl (each having 1 to 10 carbon atoms) 8) It is preferable to use an ester adduct of poly (repeating units: 1 to 6) alcohol from the viewpoint of slipperiness and releasability, and it is more preferable to use it in a mixed system with the above oxidized wax.

The laminated film of the present invention must contain a phosphoric acid ester and / or an amino acid ester. When this phosphoric acid ester and / or amino acid ester is allowed to coexist with a wax-based composition in a laminated film, when used as a backside treatment layer of a heat-sensitive transfer material, it is extremely slippery and gives high-load energy. However, it has the effect of preventing sticking.

The phosphoric acid ester is not particularly limited, but a nonmetallic ester having 4 to 25 carbon atoms is preferable from the viewpoint of the sticking prevention effect, and monoester, diester,
Any triester may be used. Examples of such compounds include nonylphenyl phosphate, dinonylphenyl phosphate, dodecylphenyl phosphate, tridecyl phosphate, lauryl phosphate, oleyl phosphate, stearyl phosphate. -G, ethylene glyco-
Rumonobutyl phosphate, nonyl phosphate, trioctyl phosphate, cresyl diphenyl phosphate
, Octyl diphenyl phosphate, trilauryl phosphate, tricetyl phosphate, tristearyl phosphate, trioleyl phosphate, and polyoxyethylene alkyl phosphate ester, polyoxyethylene alkylphenyl Examples thereof include phosphoric acid esters (where C _n H _{2n + 1} is preferable as the alkyl group, and n = 4 to 25). Among the above, polyoxyethylene alkyl phosphates and polyoxyethylene alkylphenyl phosphates are preferable because they are excellent in slipperiness and more effectively develop the sticking resistance of the present invention. Examples thereof include polyoxyethylene lauryl phosphate ester, polyoxyethylene stearyl phosphate ester, polyoxyethylene oleyl phosphate ester polyoxyethylene nonyl phosphate ester, oryoxyethylene nonylphenyl phosphate ester, polyoxyethylene dinonylphenyl phosphate ester, Examples thereof include polyoxyethylene dodecylphenyl phosphate.

The amino acid ester is a generic term for esters of compounds having a carboxyl group and an amino group in the molecule and is not particularly limited. Examples thereof include monoaminomonocarboxylic acid esters such as glycine, alanine, valine, leucine and isoleucine, diaminomonocarboxylic acid esters such as lysine and arginine, aspartic acid, monoaminodicarboxylic acid esters such as glutamic acid, and phenylalanine. , Esters of aromatic amino acids such as tyrosine, esters of sulfur-containing amino acids such as cystine, cystine, and methionine, esters of oxyamino acids such as serine and threonine, and esters of amino acids with heterocycles such as histidine, tryptophan, and oxyproline. It can be illustrated. Of these, aspartic acid ester is a mixed system with a wax, and is preferable from the viewpoint of hot stick resistance.
Particularly preferred are -alkyl aspartic acid β-alkyl esters. The alkyl group is not particularly limited, but those having a relatively long chain are preferable, and those having 8 to 25 carbon atoms are generally preferable. Such compounds include N-lauroyl aspartic acid β-lauryl ester, N-stearyl aspartic acid β-stearyl ester, N-palmityl aspartic acid β-palmityl ester, N-oleyl aspartic acid β-oleyl ester, N- Examples thereof include myristyl aspartic acid β-myristyl ester. Of course, it goes without saying that it may be a mixture with the aforementioned phosphoric acid ester.

Phosphate ester in the laminated film and /
Alternatively, the content of amino acid ester is 0.5 to 80% by weight,
It is preferably 5 to 50% by weight, more preferably 8 to 30% by weight. If the content is less than 0.5% by weight, the effect of preventing sticking under high load will be insufficient.
On the other hand, if it exceeds 80% by weight, slipperiness tends to be insufficient and sticking tends to occur. The wax component is preferably present in the laminated film in the range of 99.5 to 20% by weight. That is, within the scope of the present invention, coexistence of the wax composition and the phosphoric acid ester and / or amino acid ester in the laminated film can withstand a very wide range of load as the back surface treatment layer of the heat-sensitive transfer material, and can provide good printing runnability. It has been found that can be given.

Further, in the present invention, in the above laminated film composition,
Further, when a mixture containing an oily substance is added, printing runnability in a high pulse width region can be made particularly excellent.

The oily substance is an oil which is liquid or paste at room temperature, and examples thereof include vegetable oils, oils and fats, mineral oils and synthetic lubricating oils. The vegetable oils include linseed oil, kaya oil, saffron oil, soybean oil, cinnamon oil, sesame oil, corn oil, rapeseed oil, tuna oil, cottonseed oil, olive oil, southern oil, camellia oil, castor oil, peanut oil, banana oil. -Mum oil, coconut oil and the like. Fats and oils include beef tallow, pork oil, sheep oil, cocoa oil and the like, and mineral oils include machine oil, insulating oil, turbine oil, motor oil, gear oil, cutting oil, liquid paraffin and the like. . As the synthetic lubricating oil, those satisfying the requirements described in the Chemical Dictionary (Kyoritsu Shuppan) can be arbitrarily used. For example, olefin polymer oil, diester oil, polyalkylene glycol-
Lu oil and the like can be mentioned. Among these, mineral oil and synthetic lubricating oil, which have good running properties in the high pulse width region, are preferable. Also, a mixed system of these may be used.

The above oily substance is preferably contained in the laminated film composition in an amount of 1 to 30% by weight.

Various additives may be used in combination in the above composition within a range that does not impair the effects of the present invention. Examples thereof include antistatic agents, heat-resistant agents, antioxidants, organic and inorganic particles, pigments and the like. In addition, various additives such as a dispersion aid, a surfactant, a preservative, and an antifoaming agent may be added to the paint for the purpose of improving dispersibility in water or improving coatability.

The laminated film of the present invention preferably uses a coating method (in-line coating method) in the film manufacturing process from the viewpoint of uniform film formation and surface protrusion formation by the above composition. For that purpose, the laminated film forming coating agent is preferably used in a state of being dissolved, emulsified or suspended in water from the viewpoint of explosion proof property and prevention of environmental pollution. For example, an aqueous dispersion of a wax-based composition can be prepared by a conventionally known method (for example, JP-A-59-90625).
It is possible to obtain it.

In the present invention, in order to further improve the slipperiness and the sticking prevention effect, 20 elongated protrusions having a length / width direction ratio of 3 or more are formed on the surface of the laminated film.
It is effective to have a surface having a number of particles / 100 μm ² or more. Such protrusions can be obtained by applying the mixed water-based coating composition of the above-mentioned laminated film composition to a polyester film before crystal orientation is completed and then stretching it in one direction. A preferable composition is a petroleum wax from the viewpoint of forming protrusions, and it is particularly effective to use an oxidized wax.

In the laminated polyester film provided with the laminated film, the total content of potassium, sodium and chlorine is preferably 500 ppm or less from the viewpoint of preventing the destruction of the thermal head. As the film forming composition, it is preferable to use a composition that does not contain these elements.

The thickness of the laminated film is not particularly limited, but from the viewpoint of preventing sticking and contamination of the thermal head,
0.005 μm or more and 0.3 μm or less, preferably 0.0
It is desirable that the thickness is 1 μm or more and 0.15 μm or less.

The coating method may be any of various coating devices such as a roll.
The coating can be performed using a lucota, gravure coater, a liver coater, a kiss coater, a bar coater, or the like.

Next, as a specific example of the method for producing a laminated polyester film of the present invention, a laminated polyester film for a heat-sensitive transfer material will be described as a typical example thereof, but the present invention is not limited to this. PET containing the so-called precipitated particles and inorganic particles (for example, silica having an average particle size of 1 μm) precipitated in the polymerization step is dried by a conventional method, melt-extruded, and the extruded sheet-like melt is cooled and solidified. Make a stretched PET film. 80-120 this film
The film is heated to 0 ° C. and stretched 2.0 to 5.0 times in the longitudinal direction to obtain a uniaxially oriented film. One side of this film was subjected to corona discharge treatment in an air atmosphere, and the treated surface was diluted to a predetermined concentration with a wax composition and a phosphate ester and / or
Alternatively, an aqueous dispersion coating solution containing an amino acid ester is applied. Then, the coated film was stretched 3 to 5 times in the width direction while being heated to 90 to 140 ° C.
It is introduced into a heat treatment zone of 0 to 240 ° C. and heat treatment is performed for 1 to 10 seconds. 3-1 in the width direction during this heat treatment, if necessary
2% relaxation treatment may be applied. The film thus obtained is slit into an appropriate width to give a biaxially oriented laminated polyester film for a heat-sensitive transfer material. When this film is used as a heat-sensitive transfer material, it can be obtained by applying a heat-melting or heat-sublimation type ink to the non-application side and slitting it to a desired width.

The biaxially stretched laminated polyester film for a heat-sensitive transfer material thus obtained is provided with an ink layer according to the application, so that various heat-sensitive transfer materials such as a word processor, a facsimile, a printer for a personal computer and a video can be obtained. Printers, bar code printers, typewriters, plain paper copiers, etc., which are used for printing out characters or images, and to which particularly high load energy is applied. Suitable for printers.

[0035]

[Characteristic Measuring Method and Effect Evaluation Method] The characteristic measuring method and effect evaluating method in the present invention are as follows.

(1) Lamination Thickness A cross section of the biaxially oriented polyester film provided with a coating layer was cut out and measured from an electron microscopic observation photograph of 100,000 times. The thickness is the average of the maximum and minimum thickness within one field of view,
The average value of 30 measurement points was taken as the laminate thickness.

(2) Dynamic friction index HEIDON-14DR-ANL device (Shinto Kagaku Co., Ltd.)
10) in the atmosphere of 25 ° C. and 65% RH.
The dynamic friction index at the point contact with the mm stainless steel ball was measured. The measurement was carried out at a load of 200 g and a running speed of 200 mm / min. From the chart measured for 4 seconds (recording data every 2.0 msec), the average frictional resistance from 1 second after the start of measurement to the end of measurement was rubbed. It was an index.

(3) Hot-Stickness-1 The following hot-melt ink was applied to a laminated biaxially oriented polyester film opposite to the laminated surface by the hot-melt method to give 3-4.
It was applied to a thickness of μm to prepare a heat-sensitive transfer material.

[Hot Melt Ink Composition] Carnauba wax 100 parts by weight Microcrystalline wax 30 parts by weight Vinyl acetate / ethylene copolymer 15 parts by weight Carbon black 20 parts by weight Thermal transfer printer-BC-8MK manufactured by Autonix.
Using II, the applied voltage was changed with a thermal head having a head resistance of 500Ω, and the applied voltage level at which sticking did not occur when printing was run with a pulse width of 0.5 msec was evaluated. did.
In addition, even if the voltage is less than 10 V, the one in which sticking occurs is marked as [x]. Plain paper was used as the transfer paper.

(4) Hot sticking property-2 A sublimable ink having the following composition was applied to the surface opposite to the laminated surface, dried and then slit into an appropriate width to prepare a heat-sensitive transfer material.

[Sublimation ink composition] Disperse dye KST-B-136 (manufactured by Nippon Kayaku Kabe) 4 parts by weight Ethyl hydroxyethyl cellulose 6 parts by weight Methyl ethyl ketone 45 parts by weight Toluene 45 parts by weight This heat-sensitive transfer material is sublimated. A printer (Sharp Color Video Printer-GZ-P11W) was run under normal use conditions and judged according to the following criteria.

⊚: No sticking at all, and excellent running property.

◯: Normal printing is possible without running problems, but a slight stick sound is generated in the solid printing portion.

Δ: A readable level.

X: A level at which the stick is extremely unreadable.

(5) Hot Stick Property-3 Using the thermal transfer material prepared in the above (3), using a high speed thermal transfer printer (KM705A manufactured by Anritsu Corporation) 1
Observe the sticking condition when printing at a speed of 20 mm / sec, and if the sticking does not occur and normal printing is possible (○), stick sound is generated even if it runs, but there is some distortion or misalignment in printing. The evaluations were evaluated as (Δ) when the occurrence of “B” occurred, and as (X) when the travel failure was caused by the stick.

(6) Head Contamination and Abrasion After printing for 3000 m under the condition (3) above, the thermal head was removed and the contamination and wear of the head was observed with a 100 × optical microscope. . If the contaminated area of the head portion was less than 30%, it was [O], and if it was 30% or more, it was [X], and if it was less than 30%, it could not be removed by wiping with ethyl alcohol. In addition, the state of occurrence of scratches on the thermal head was observed, and those having no scratches were marked with "O" and those having scratches were marked with "X".

(7) Inking Property and Ink Adhesion Property Another polyester film is superposed so as to be in contact with the laminated film surface of the biaxially oriented polyester film provided with the laminated film, and a load of 50 kg / cm ² is applied at 70 ° C. It was left for 24 hours. Then, the two films were peeled off, and the ink of (3) above was applied to the surface of the other polyester film which was in contact with the laminated film surface, and the degree of cissing was observed.
The ink is applied by the hot melt method, and the applied thickness is 3-4.
μm. The one with no repellency was marked with “◯”, and the one with slight repellency was marked with “×”. In addition, the ink layer is 20
The case where the peeled area when peeled off with a tape having an adhesiveness of g / cm ² was less than 20% was marked with ∘, and the case where it was 20% or more was marked with x.

[0049]

EXAMPLES The present invention will now be described based on examples.
It is not necessarily limited to this.

Example 1 0.15% by weight of precipitated particles having a particle size of 0.5 to 1.5 μm (particles precipitated during the polymerization step), and an average particle size of 1.5
PE containing 0.2% by weight of calcium carbonate particles of μm
T pellets (intrinsic viscosity 0.63 dl / g) were sufficiently vacuum-heated and dried, then fed to an extruder and melted at 280 ° C.,
After filtering with a 10 μm cut metal sintered filter, T
The film is extruded from the letter-shaped die into a film, and the surface temperature is 30
It was wound around a cooling drum at ℃ and solidified by cooling. In order to improve the adhesion between the film and the surface of the cooling drum during this period, a wire electrode was arranged on the film side and a DC voltage of 6 KV was applied. The unstretched PET film thus obtained was heated to 95 ° C. and stretched 3.5 times in the longitudinal direction to obtain a uniaxially stretched film. One side of this film was subjected to corona discharge treatment in air, and the treated surface had a coating thickness of 0.0 after biaxially stretching a water-dispersed coating composition of the following composition by a gravure coat method.
It was applied so as to have a thickness of 5 μm.

“Paint composition” (a) Oxidized wax water dispersion 80 parts by weight (solid content ratio) (b) Polyoxyethylene alkylphenyl phosphate (phosphanol RE610 manufactured by Toho Chemical Industry Co., Ltd.) 20 parts by weight ( Solid content ratio) The coating liquid mixed in the above ratio has a total solid content weight ratio of 1.0%.
It was prepared by diluting with water so that

The coated uniaxially stretched film was gripped with a clip and introduced into a tenter, and water was dried in a preheating step at 110 ° C., and then stretched 4.5 times in the width direction while heating at 120 ° C., Subsequently, heat treatment was performed at 225 ° C. for 5 seconds to obtain a laminated polyester film having a laminated thickness of 0.05 μm and a film thickness of 5 μm. A heat-sensitive transfer material was prepared from this laminated polyester film according to the above-mentioned evaluation method and evaluated.
The results are shown in Table 1.

Examples 2 to 6 and Comparative Examples 1 to 3 A laminated polyester film was prepared in the same manner as in Example 1 except that the mixing ratio of the coating compositions (a) and (b) in Example 1 was changed as shown in Table 1. And a thermal transfer material was prepared. The results are shown in Table 1.

Example 7 The same as Example 1 except that N-lauroyl aspartic acid lauryl ester was used as the coating composition (c) instead of the coating composition (b) of Example 1 in a solid content ratio of 20% by weight. To produce a laminated polyester film. A thermal transfer material using this laminated polyester film was prepared and evaluated. The results are shown in Table 2.

Examples 8 to 11 and Comparative Examples 4 to 6 Table 2 shows the mixing ratios of (a) and (c) in the coating composition of Example 7.
A laminated polyester film and a heat-sensitive transfer material were prepared and evaluated in the same manner as in Example 7 except that the above was changed.
The results are shown in Table 2.

Example 12 A laminated polyester film and a heat-sensitive transfer material were prepared and evaluated in the same manner as in Example 1 except that the coating composition of Example 1 was changed as follows. The results are shown in Table 2. "Paint composition" (a) Aqueous dispersion of oxidized wax 80% by weight (solid content ratio) (b) Polyoxyethylene alkylphenyl phosphate (phosphanol RE610 manufactured by Toho Chemical Industry Co., Ltd.) 10% by weight (solid content ratio) ) (C) N-lauroyl aspartic acid lauryl ester 10% by weight (solid content ratio)

[Table 1]

[Table 2]

[0057]

Industrial Applicability According to the present invention, a wax composition, a phosphate ester and / or a polyester film are provided on at least one side of a polyester film.
Alternatively, in a laminated film containing an amino acid ester as a main component, the content of the phosphoric acid ester and / or the amino acid ester in the laminated film is set to 0.5 to 80% by weight, whereby extremely hot stick resistance when used as a thermal transfer material is obtained. Can be excellent.

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Claims (1)

[Claims] 1. A laminated film having a laminated film containing a wax composition and a phosphoric acid ester and / or an amino acid ester as main components on at least one surface of a polyester film, wherein the phosphoric acid ester in the laminated film. And / or an amino acid ester content of 0.5 to 80% by weight, a laminated polyester film.