KR20150055974A - Matt heat shrinkable polyester film - Google Patents

Abstract

The present invention relates to a matte heat-shrinkable polyester film. More specifically, the polyester film has excellent basis properties regarding the heat resistance, printing properties, solvent bonding properties, shrinkage uniformity, and stretching processability. The polyester film does not require an additional matt coating process for a coextruded base film. Accordingly, the present invention can ensure the time stability and reduce the costs. The polyester film has excellent antistatic performance and post-processability. According to the present invention, the matte heat-shrinkable polyester film includes coating layers formed by coating a matt coating composition on one or both surfaces of a polyester base film.

Description

MATT HEAT SHRINKABLE POLYESTER FILM [0002]

More specifically, the present invention relates to a matte heat-shrinkable polyester film having excellent basic properties such as heat resistance, printing characteristics, solvent adhesion properties, shrinkage uniformity, and stretch processability, and an additional matte coating process is required for the coextruded base film Heat-shrinkable polyester film excellent in antistatic performance and post-processability, which can achieve long-term stability and cost reduction.

Generally, polyvinyl chloride, polystyrene, polypropylene, polyethylene or the like is used as the heat shrinkable film. However, polyvinyl chloride films have very poor environmental compatibility due to problems such as chlorine gas and dioxin emission during incineration. The polystyrene-based film can be evaluated in terms of good finishing appearance after shrinkage. However, since the solvent resistance is poor, it is necessary to use an ink having a specific composition at the time of printing. The polypropylene-based film has poor shrinkability at low temperatures, and wrinkles and unevenness tend to occur at the shrinkage portion. In addition, all of the above films are insufficient in heat resistance, and are easily melted or ruptured during the boiling treatment or the retort treatment, making it difficult to maintain the film state.

In recent years, studies on polyester-based heat-shrinkable films have been actively conducted to solve these problems, and they have been attracting attention as shrinkable labels replacing polyvinyl chloride films and polystyrene films. In order to increase the usage of PET containers The usage is also gradually increasing. However, since the heat-shrinkable polyester film can achieve uniform shrinkage due to low-temperature shrinkage and low shrinkage rate, good shrink appearance can be highly evaluated, but since the solvent resistance is poor, it is necessary to use a special composition ink But also has a problem in that it is difficult to store because of its large natural shrinkage ratio. Further, in the regeneration of the PET bottle, the polyester shrink film of the same material is disadvantageous in that it is difficult to separate the gravity difference and the recyclability is deteriorated. In addition, the heat-shrinkable polyester film may cause dust or the like in the air to adhere to the film due to static electricity in the labeling process at the time of post-processing, or may cause a cutting defect due to static electricity in a high-speed cutting process, There is a problem that the labels stick together.

In order to solve such a problem, Korean Patent Laid-Open Publication No. 2002-0073305 discloses a method for forming a coating layer containing a quaternary ammonium sulfate derivative and a polysiloxane resin on at least one surface of a film to improve antistatic property, slip property and blocking resistance . However, when printing showing the effect of glossy or matte, it is required to perform another processing on one side or both sides, so that the stability over time is deteriorated, the difference of the degree of matte with time occurs, and furthermore, The problem is falling.

Accordingly, the present inventors have made efforts to solve the above-mentioned problems. As a result, the inventors have found that a heat-shrinkable polyester film itself is matte treated with an aqueous coating containing a light-quenching agent to provide a matte heat-shrinkable polyester The present invention has been completed by preparing a film.

Korean Patent Publication No. 2002-0073305

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a base film excellent in basic properties such as heat resistance, printing property, solvent adhesion property, shrinkage uniformity, Heat-shrinkable polyester film which does not require any process, and which can achieve long-term stability and cost reduction, and which is further excellent in antistatic performance and post-processability.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

This object is achieved by a matte heat-shrinkable polyester film characterized in that it comprises a coating layer coated on one or both sides of the polyester base film with a matte coating composition.

Here, the matte coating composition is characterized by comprising an antistatic composition comprising a copolymer polyester, a methyl methacrylate copolymer and an alkyl phosphate, and a quencher.

Preferably, the antistatic composition comprises 5 to 20 parts by weight of an acrylic copolyester polymer and 20 to 60 parts by weight of an alkyl phosphate based on 100 parts by weight of the copolymerized polyester.

Preferably, the quencher is an organic particle such as polymetal methacrylate or polycarbonate having an average particle size of 1 to 10 mu m or an inorganic particle such as silica, dry silica, alumina, silica oxide, titanium oxide, barium sulfate, Or an organic or inorganic hybrid.

Preferably, the amount of the quencher is 5 to 15 parts by weight based on 100 parts by weight of the antistatic composition.

Preferably, the thickness of the coating layer is 0.5 to 10 mu m.

Preferably, the gloss of the surface of the coating layer is 20 to 50 at an angle of 60 °.

Preferably, the dicarboxylic acid component of the polyester base film is terephthalic acid or dimethyl terephthalate and the diol component is selected from the group consisting of 60 to 90 mol% of ethylene glycol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol , Propanediol, and butanediol, and 10 to 40 mol% of at least one diol selected from the group consisting of propanediol and butanediol.

Preferably, the polyester-based film has a mean particle diameter of 1 ~ 5㎛ silica particles, PE, organic particles such as PMMA, SiO _2, CaCO _3, such as inorganic particles or organic-inorganic hybrid particles of polyester resin based on the weight of the 0.01 By weight to 1% by weight.

Preferably, the surface resistance value of the coating layer is less than 1 X ^{10 11} ? / Sq.

Preferably, the non-heat-shrinkable heat-shrinkable polyester film is characterized in that the shrinkage in the main shrinkage direction measured after immersing in hot water at 90 ° C for 10 seconds is 30% or more.

Preferably, the heat-shrinkable polyester film has a heat shrinkage ratio in the main shrinkage direction measured after immersing in hot water at 90 ° C for 10 seconds and a difference in heat shrinkage ratio in the main shrinkage direction measured after immersing in hot water at 80 ° C for 10 seconds 40% or less.

According to the present invention, there is no need for an additional matte coating process on the coextruded base film, thereby achieving long-term stability and cost reduction. Further, the antistatic composition is applied to one side of the film, And a matte effect can be realized.

Further, according to the present invention, there are effects such as excellent basic properties such as heat resistance, printing property, solvent adhesion property, shrinkage uniformity and stretch processability.

Hereinafter, the present invention will be described in detail with reference to examples of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described herein.

Unless otherwise stated, all percentages, parts, and percentages are by weight. It will also be understood that when an amount, concentration, or other value or parameter is given in any one of a range, a preferred range, or a list of preferred upper limits and preferred lower limits, it is understood that any upper limit range, It should be understood that specifically all ranges formed from any pair of range limits or desirable values are to be understood. Where a range of numerical values is referred to in this specification, unless otherwise stated, the range is intended to include all the integers and fractions within the endpoint and its range. The scope of the present invention is not intended to be limited to the specific values that are mentioned when defining the scope.

When the term "about" is used to describe the endpoint of a value or range, it is to be understood that the present disclosure encompasses the particular value or endpoint mentioned.

As used herein, the terms "comprise," "include," "including," "including," "containing," " Having ", " having ", " having ", or any other variation thereof, are intended to cover an inclusion not exclusive. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to such elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus It is possible. Also, unless explicitly stated to the contrary, "or" does not mean " comprehensive " or " exclusive "

Where an applicant defines an invention or portion thereof in an open term such as "comprising ", it should be readily understood that the description should be interpreted as describing the invention using the term" consisting essentially & do.

In describing a given polymer, it is sometimes understood that the applicant refers to a polymer by the amount of monomers used to make the polymer or the monomers used to make the polymer. Such a description may not include the specific nomenclature used to describe the final polymer or may not include product-by-process terms, but any such reference to monomers and amounts is intended to encompass the use of the polymer Should be construed to mean that they include the amounts of these monomers (i.e., the copolymerized units of these monomers) or monomers, and the corresponding polymers and compositions thereof.

In describing and / or claiming the present invention, the term "copolymer" is used to refer to a polymer formed by copolymerization of two or more monomers. Such copolymers include binary copolymers, terpolymers, or higher order copolymers.

The matte heat-shrinkable polyester film according to the first aspect of the present invention is characterized by including a coating layer (hereinafter also referred to as a "coating layer") coated on one side or both sides of the polyester base film with a matte coating composition, , The matte coating composition comprises an antistatic composition consisting of a copolymer polyester, a methyl methacrylate copolymer and an alkyl phosphate and a quencher.

That is, according to the present invention, by controlling the particle size and the particle content of the quencher added to one side or both sides of the polyester base film by water-based coating, it is possible to control the gloss of the film without any other matte treatment, Matt heat-shrinkable polyester film capable of realizing a matte effect.

The antistatic composition is a polyester antistatic agent and is characterized by containing 5 to 20 parts by weight of an acrylic copolyester polymer and 20 to 60 parts by weight of an alkyl phosphate based on 100 parts by weight of the copolymerized polyester.

The quencher may be an organic particle such as polymetal methacrylate or polycarbonate having an average particle size of 1 to 10 mu m or an inorganic particle such as silica, dry silica, alumina, silica oxide, titanium oxide, barium sulfate, And an organic / inorganic hybrid. When the average particle diameter of the particles is less than 1 탆, the particles tend to agglomerate easily and it is difficult to obtain uniform particles and it is difficult to secure the running property of the film. On the other hand, The roughness becomes large, and it is difficult to secure the appearance of the molded article.

The content of the quencher is preferably 5 to 15 parts by weight based on 100 parts by weight of the antistatic composition. When the content of the particles is less than 5 parts by weight, it is difficult to exhibit sufficient non-light-shielding properties and at the same time, it is difficult to ensure the film running property. On the other hand, when the content of particles exceeds 15 parts by weight, the surface of the film becomes very rough, It is difficult to secure properties and there is a fear that the film breakage due to particles during film stretching may occur.

The thickness of the coating layer (coating layer) is preferably in the range of 0.5 to 10 占 퐉. If the coating layer is less than 0.5 占 퐉, the coating amount is not enough to realize the matting effect. If the coating layer is more than 10 占 퐉, .

It is also preferable that the glossiness of the surface of the coating layer is 20 to 50 at an angle of 60 °. If the glossiness is less than 20 at an angle of 60 °, the glossiness is too low to print clearly, It is preferable to set it to the above-mentioned range.

The polyester base film of the present invention is prepared by copolymerization of a dicarboxylic acid and a diol component and addition of silica particles, and the dicarboxylic acid is preferably dimethyl terephthalate, terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxyl Acid, sebacic acid, adipic acid, diphenyldicarboxylic acid, 5-tert-butylisophthalic acid, 2,2,6,6-tetramethyldiphenyl-4,4'-dicarboxylic acid, 1,1 , 3-trimethyl-3-phenylindan-4,5-dicarboxylic acid, 5-sodium sulfoisophthalic acid, trimellitic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, Cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, or a mixture thereof, and the diol component is at least one member selected from the group consisting of an entire diol Based on 100% by mole of ethylene glycol, 60 to 90% by mole of ethylene glycol, and neopentyl glycol, 1,4-cyclohexanedimetate Ol, diethylene glycol, propanediol, butanediol, and one or more compounds of 10 to 40 mol%, selected from the group consisting of is mixed. When the content of neopentyl glycol in the diol component is less than 10 mol%, the dimensional stability of the copolymer polyester increases, a sufficient heat shrinkage is difficult to be realized, shrinking speed and shrinkage stress are excessively high, When the content of neopentyl glycol is more than 40 mol%, crystallization of the manufactured chip is difficult, so that chips are welded together in a raw material drying process to prevent hydrolysis, thereby causing process troubles.

Also, the silica particles contain 0.01 to 1% by weight of silica particles having an average particle diameter of 1 to 5 탆, based on the weight of the polyester resin, to prepare a copolymerized polyester resin. Here, in addition to silica particles, organic particles such as PE and PMMA, inorganic particles such as SiO ₂ and CaCO ₃ , or organic hybrid particles can be used.

The non-heat-shrinkable heat-shrinkable polyester film according to the present invention has an excellent antistatic property and a good blocking resistance with a film having a glossiness of 20 to 50 and less than 10 ¹¹ . Accordingly, the present invention can provide a matte heat-shrinkable polyester film that is in an in-line coating method and has a glossiness of 20 to 50, and is excellent in antistatic performance and blocking resistance to provide a matte effect.

Next, a method for producing a matte heat-shrinkable polyester film according to the present invention will be described.

The matt heat-shrinkable polyester film according to the present invention can be produced by a known method. The shape of the film may be either a plane shape or a tube shape, but a planar shape is preferable in view of productivity and printing on the inner surface. As a method of producing a planar film, for example, a resin is melt-extruded using a plurality of extruders, co-extruded from a T-die, and then cooled and solidified by a roll to obtain a sheet. The obtained sheet is stretched at a temperature not lower than the glass transition temperature by the tenter method without roll stretching in the longitudinal direction, and is heat-treated and cooled to obtain a film. The stretching temperature in the stretching step is preferably 60 to 100 占 폚, preferably 70 to 90 占 폚. If the stretching temperature is less than 60 캜, stretching occurs at a temperature lower than the glass transition temperature of the copolyester resin, so that breakage occurs and stretching is impossible. When the stretching temperature is 100 캜 or more, the elasticity of the material is lowered. Can not.

The stretching magnification is suitably in the uniaxial or biaxial stretching direction of 3.0 to 7.0 times, preferably 3.5 to 5.0 times in the main shrinkage direction depending on the properties of the resin composition to be used, the stretching means, the stretching temperature and the use of the product. When the stretching ratio is less than 3.0 times, it is difficult to realize a sufficient heat shrinkage. When the stretching ratio exceeds 7.0 times, the shrinking stress value becomes excessive, or the frequency of occurrence of fracture due to stretching beyond the yielding point increases. Even in the case of uniaxial stretching in the transverse direction, it is also effective to give about 1.05 to 1.8 times of stretching in the longitudinal direction for the purpose of improving the mechanical properties in the longitudinal direction. The stretched film is subjected to a heat treatment or relaxation treatment at a temperature of 100 DEG C or less for the purpose of reducing the natural shrinkage ratio or improving the heat shrinkage property as required, and then rapidly cooled within a time period during which the molecular orientation is not relaxed, An ester film can be obtained.

Further, it is preferable that the heat-shrinkable polyester film is produced from a non-stretched sheet at a preheating temperature of 60 to 100 ° C, a stretching temperature and a heat-set temperature.

In addition, there is no specific thickness limitation in the production of the film. The heat-shrinkable heat-shrinkable polyester film of the present invention is mainly used in the form of a sleeve (cylindrical). In the case of printing on a rectangular or cylindrical container such as a PET bottle, first, one side of a wide-width film on which a roll is wound is printed, cut into a required width, and folded folded and center sealed to form a cylindrical shape. Examples of the center sealing method include an adhesive method using an organic solvent, a method using an adhesive, and a method using an impulse sealer. Among these methods, an adhesive method using an organic solvent is preferably used from the viewpoints of productivity and appearance.

Next, characteristics of the heat-shrinkable heat-shrinkable polyester film according to the present invention will be described.

In the non-heat-shrinkable heat-shrinkable polyester film according to the present invention, the surface resistance value of the coating layer is preferably less than 1 × ^{10 11} Ω / sq.

The heat-shrinkable polyester film according to the present invention has a shrinkage ratio in the main shrinkage direction measured after immersing in hot water at 90 ° C for 10 seconds of not less than 30%, preferably not less than 50%, more preferably not less than 70%. When the shrinkage ratio in the main shrinking direction is less than 30%, there is a problem that the shrinkage rate is insufficient for labeling a product having a bottle bending.

The heat shrinkage ratio in the main shrinkage direction measured after immersing in hot water at 90 DEG C for 10 seconds and the heat shrinkage difference in the main shrinkage direction measured after immersing in hot water at 80 DEG C for 10 seconds is 40% or less, preferably 30% or less . In the temperature range of 80 to 90 占 폚, which is the steam temperature of a commonly used steam tunnel, the heat shrinkage difference is set to 40% or less so that shrinkage fluctuation caused by temperature fluctuation of water vapor is suppressed when labeling the object, This is because defective finishing defects such as pear marks can be suppressed.

Although the use of the heat-shrinkable heat-shrinkable polyester film according to the present invention is not particularly limited, it is possible to form a printing layer, a vapor deposition layer, and other functional layers (antistatic function, It can be used for labeling and packaging of other molded products such as. When used as a heat-shrinkable label, it can be adhered to a complicated shape, and a container equipped with an elegant label free from wrinkles and puckering due to uneven shrinkage can be obtained.

The molded article or heat-shrinkable label according to the second aspect of the present invention is characterized by using the above-described matt heat-shrinkable polyester film as a substrate.

The container according to the third aspect of the present invention is characterized in that the molded article or the heat-shrinkable label according to the second aspect is mounted.

Hereinafter, the structure and effect of the present invention will be described in more detail with reference to examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

[Example 1]

Production Example 1: Production of polyester base film

100 mol% of dimethyl terephthalate as a dicarboxylic acid component, 80 mol% of ethylene glycol as a diol component and 20 mol% of neopentyl glycol were charged into an autoclave equipped with a stirrer and a distillation tower, and then manganese acetate as a transesterification catalyst 0.07% by weight based on the amount of dimethyl terephthalate. 2 kg / cm < 2 >, and the reaction was allowed to proceed while raising the temperature to 250 DEG C while removing water as a by-product. After the esterification reaction was completed, 0.02 wt% of trimethyl phosphate as a heat stabilizer was added to the second reactor equipped with a vacuum system, and 0.04 wt% of antimony trioxide was added as a polymerization catalyst in 10 minutes. Thereafter, while the temperature was gradually raised to 285 DEG C, the pressure was reduced gradually to 1 torr or less over 50 minutes, and the copolymer was polymerized for 240 minutes while removing the excess diol component through a vacuum line to obtain a copolymer polyester having an intrinsic viscosity of 0.70 dl / g. 0.07 wt% of amorphous spherical silica particles having an average particle size of 3 탆 on the basis of the weight of the polyester resin was added to the thus obtained polymer, and the resulting mixture was melt-extruded at 250 캜 and co-extruded from the T- ≪ / RTI >

Production Example 2: Production of heat-shrinkable polyester film

A corona discharge treatment was applied to one side of the film to be coated on both sides of the obtained non-stretched sheet, and a corona-treated surface was coated with 58 wt% of copolymerized polyester, 8 wt% of methyl methacrylate copolymer, 34 wt% , 5 parts by weight of amorphous spherical silica particles having an average particle size of 5 mu m as a light quenching agent was added to the antistatic composition, which was then emulsified and applied to the Meyer bar coating method, and then maintained at 90 DEG C by the tenter method After passing through the preheating zone, the film was stretched 4.0 times in the transverse direction at 80 DEG C and heat-treated at 60 DEG C to prepare a heat-shrinkable polyester film having a thickness of 50 mu m.

[Example 2]

Shrinkable polyester film was prepared in the same manner as in Example 1, except that 15 parts by weight of amorphous spherical silica particles having an average particle diameter of 5 mu m as a quenching agent was added to 100 parts by weight of the antistatic composition.

[Example 3]

Shrinkable polyester film was prepared in the same manner as in Example 1, except that 10 parts by weight of amorphous spherical silica particles having an average particle diameter of 10 mu m as a quenching agent was added to 100 parts by weight of the antistatic composition.

[Comparative Example 1]

Shrinkable polyester film was prepared in the same manner as in Example 1, except that 5 parts by weight of amorphous spherical silica particles having an average particle size of 0.5 mu m as a quencher were added to 100 parts by weight of the antistatic composition.

[Comparative Example 2]

Shrinkable polyester film was prepared in the same manner as in Example 1, except that 5 parts by weight of amorphous spherical silica particles having an average particle diameter of 20 mu m as a quenching agent was added to 100 parts by weight of the antistatic composition.

[Comparative Example 3]

Shrinkable polyester film was prepared in the same manner as in Example 1, except that 0.1 part by weight of amorphous spherical silica particles having an average particle diameter of 5 탆 as a quenching agent was added to 100 parts by weight of the antistatic composition.

[Comparative Example 4]

Shrinkable polyester film was prepared in the same manner as in Example 1, except that 40 parts by weight of amorphous spherical silica particles having an average particle diameter of 5 mu m as a quencher were added to 100 parts by weight of the antistatic composition.

[Comparative Example 5]

A heat-shrinkable polyester film was prepared in the same manner as in Example 1, except that silica particles were not added to the antistatic composition.

The physical properties of the heat-shrinkable polyester films according to Examples 1 to 3 and Comparative Examples 1 to 5 were measured through the following experimental examples, and the results are shown in Table 1 below.

[Experimental Example]

(1) Heat shrinkage

The film was cut into a square of 10 cm x 10 cm and immersed in hot water maintained at a temperature of 90 deg. C for 10 seconds in a no load state, and the length was measured. The heat shrinkage rate was determined according to the following formula.

Heat shrinkage percentage (%) = 100 X (length before shrinkage - length after shrinkage) / (length before shrinkage)

(2) Antistatic property

After standing for 8 hours under the conditions of 25 占 폚 and 55 占 폚, antistatic properties were evaluated with a surface resistance meter (ADVANTEST, manufactured by Advantec, Japan). The unit is Ω / sq.

(3) Glossiness

The gloss was measured at a measurement angle of 60 DEG with a PG-1 model of GARDNER according to ASTM D523.

(4) Surface roughness

Surface roughness is measured using a three-dimensional surface roughness meter. Measurements are made on the basis of the coated surface. According to JIS B0601 standard, it was measured by SE-3H Model of KOSAKA.

(5) Slip property (dynamic friction coefficient)

The kinetic / static friction coefficient was measured according to ASTM D1894 under the conditions of 25 캜 and 60 RH%. The length (mm) of the lower specimen was 250 X 130, the length (mm) of the upper specimen was 65 X 60, and the average value of the remaining values except for the maximum value and the minimum value was measured five times at a rate of 150 mm / min.

(6) Blocking resistance

The film-coated side was abutted against each other using a roller type laminator, peeled off at a temperature of 120 占 폚 under a pressure of 2 kg / cm2 at a rate of 5 mpm, and peeled to evaluate the anti-blocking property.

○: It is peeled cleanly without stickiness.

△: The sticking mark remains but peelable.

X: Fusing between films occurs, and peeling is impossible.

(7) Printing characteristics

The nitrocellulose ink was applied to the surface of the film, and then a grid pattern was formed on the surface of the film at regular intervals using a razor blade. Subsequently, when a 3M 610M scotch tape was adhered to the coated surface of the film and then rub-off test was rapidly performed (rub-off test), the degree of transfer of the ink on the tape adhesion surface was evaluated and evaluated as follows.

○: Ink transfer rate to 3M tape 0%

DELTA: ink transfer rate to 3M tape less than 30%

Х: 30% or more ink transfer rate for 3M tape

(8) Adhesion

Five rounds of rubbing with a thumb were rubbed and evaluated visually.

◎ (No smear): No change after evaluation

○ (Slightly smear): It is fine but there is no problem in use

△ (Smear): As the oil is pushed, the coating layer becomes cloudy.

Х (Rub-off): The coating layer clumps off

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Heat shrinkage (%) 72 73 71 73 72 75 72 71 Glossiness 25 20 25 75 35 110 15 150 Surface roughness (nm) 35 43 40 26 55 20 49 15 Coefficient of friction dynamic 0.4 0.4 0.4 0.2 0.3 0.2 0.5 0.6 silence 0.5 0.6 0.5 0.4 0.5 0.3 0.6 0.9 Surface resistance
(Ω / sq) 7X10 ⁸ 8X10 ⁸ 7X10 ⁸ 6X10 ⁸ 6X10 ⁸ 9X10 ⁸ 6X10 ⁸ 7X10 ⁸ My blocking ability ○ ○ ○ △ ○ △ ○ X Printing characteristics ○ ○ ○ ○ △ ○ ○ ○ Jungle ◎ ◎ ◎ ◎ ○ ◎ X ◎

As can be seen from Table 1, in the case of Comparative Example 1 using 0.5 mu m silica particles, the glossiness is higher than that of Examples, and it is difficult to realize a matte finish, and the coefficient of friction is lowered. On the other hand, in Comparative Example 2 using 20 mu m silica particles, there is a disadvantage that the printing characteristics are poor due to high surface roughness. Also, in the case of Comparative Example 3 using 0.1 parts by weight of 5 mu m silica particles, it is difficult to realize the non-glare properties because of high glossiness, and likewise, there is a disadvantage that the running property is also poor due to the low friction coefficient. On the other hand, in the case of Comparative Example 4 in which 40 parts by weight of 5 mu m silica particles were used, the surface roughness was increased and the appearance of the molded article was deteriorated. In the case of Comparative Example 5 in which no silica particles were added at all, no anti-glare property was realized at all and the anti-blocking property became poor.

As described above, the present invention first provides a matte heat-shrinkable polyester film that implements a matte effect. In other words, by controlling the particle amount and the particle size of the light extinguishing agent contained in one side or both sides of the polyester film, the glossiness of the film-coated surface is controlled to achieve a matte effect. Thus, it is possible to provide a matte heat-shrinkable polyester film which solves the time-dependent change in coating and the high cost, which has been pointed out as a disadvantage in a method of producing a matting label through a matting treatment on the surface of a film in the past. Second, there is provided a film which has anti-fouling and post-processability of a film by applying an antistatic layer on one side of a matte heat-shrinkable polyester film that implements the matte effect of the present invention and has improved blocking resistance by surface unevenness .

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (12)

A matte heat-shrinkable polyester film characterized by comprising a coating layer applied to one side or both sides of a polyester base film with a matte coating composition. The method according to claim 1,
Wherein the matte coating composition comprises an antistatic composition consisting of a co-polyester, a methyl methacrylate copolymer and an alkyl phosphate, and a light extinguishing agent. 3. The method of claim 2,
Wherein the antistatic composition comprises 5 to 20 parts by weight of an acrylic copolyester polymer and 20 to 60 parts by weight of an alkyl phosphate per 100 parts by weight of the copolymerized polyester. 3. The method of claim 2,
The quencher may be an inorganic particle such as silica, dry silica, alumina, silica oxide, titanium oxide, barium sulfate, potassium carbonate or aluminum oxide, or an organic particle such as polymethyl methacrylate or polycarbonate having an average particle size of 1 to 10 탆 Organic hybrid resin. ≪ RTI ID = 0.0 > 21. < / RTI > 3. The method of claim 2,
Wherein the content of the quencher is 5 to 15 parts by weight based on 100 parts by weight of the antistatic composition. 6. The method according to any one of claims 1 to 5,
Wherein the coating layer has a thickness of 0.5 to 10 占 퐉. 6. The method according to any one of claims 1 to 5,
Wherein the gloss of the surface of the coating layer is 20 to 50 at an angle of 60 °. 6. The method according to any one of claims 1 to 5,
Wherein the dicarboxylic acid component of the polyester base film is terephthalic acid or dimethylterephthalate and the diol component is selected from the group consisting of 60 to 90 mol% of ethylene glycol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol, propanediol, Butanediol and 10 to 40 mol% of at least one diol selected from the group consisting of butanediol. 9. The method of claim 8,
The polyester-based film has a mean particle diameter of 1 ~ 5㎛ silica particles, PE, organic particles such as PMMA, SiO _2, CaCO ₃ inorganic particles or organic-inorganic hybrid particles based on the weight of the polyester resin, such as 0.01 to 1% by weight By weight based on the total weight of the heat-shrinkable polyester film. 6. The method according to any one of claims 1 to 5,
Wherein the coating layer has a surface resistivity of less than 1 x ¹⁰ < ¹¹ > ohm / sq. 6. The method according to any one of claims 1 to 5,
Shrinkable polyester film is characterized in that the shrinkage in the main shrinkage direction measured after immersing in hot water at 90 캜 for 10 seconds is 30% or more. 6. The method according to any one of claims 1 to 5,
The heat-shrinkable polyester film has a heat shrinkage ratio in the main shrinkage direction measured after immersing in hot water at 90 ° C for 10 seconds and a difference in heat shrinkage ratio in the main shrinkage direction measured after immersing in hot water at 80 ° C for 10 seconds is 40% Characterized in that the heat-shrinkable polyester film is a heat-shrinkable polyester film.