KR20150061173A - White polyester reflective film and method for manufacturing the same - Google Patents
White polyester reflective film and method for manufacturing the same Download PDFInfo
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- KR20150061173A KR20150061173A KR1020130144878A KR20130144878A KR20150061173A KR 20150061173 A KR20150061173 A KR 20150061173A KR 1020130144878 A KR1020130144878 A KR 1020130144878A KR 20130144878 A KR20130144878 A KR 20130144878A KR 20150061173 A KR20150061173 A KR 20150061173A
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Abstract
The present invention relates to a white polyester reflective film and a method for producing the same, and more particularly, to a white polyester reflective film and a method for producing the same, By increasing the reflection efficiency compared to the existing spherical organic particles and improving the optical characteristics and by increasing the elongation at break by lowering the bulk density by binding of the organic and inorganic particles to the case of containing the organic and inorganic particles constituting the film, To a white polyester reflection film capable of minimizing the frequency of breakage in the process, and a method of manufacturing the same.
Description
The present invention relates to a white polyester reflective film and a method for producing the same, and more particularly, to a white polyester reflective film and a method for producing the same, By increasing the reflection efficiency compared to the existing spherical organic particles and improving the optical characteristics and by increasing the elongation at break by lowering the bulk density by binding of the organic and inorganic particles to the case of containing the organic and inorganic particles constituting the film, To a white polyester reflection film capable of minimizing the frequency of breakage in the process, and a method of manufacturing the same.
The white polyester film to be used for conventional reflector applications is prepared by mixing spherical organic particles which are non-emissive in polyester resin into polyester resin, as disclosed in Korean Patent Laid-Open Nos. 2009-7025294 and 2011-0089060, It is common to form pores inside the film by extrusion with the polyester resin to which the particles have been added.
In the case of a white polyester film in which pores are formed inside the film as known in the art and a white pigment is added, a high reflectivity is achieved due to a high particle bulk density in the film. However, since the stretchability is lowered, It is necessary to provide an improved film-forming property without impairing the light reflectivity.
Accordingly, the present inventors have made efforts to solve the problems of the white polyester film used in the conventional reflection plate. As a result, in the conventional white polyester film production method, the white inorganic particles are combined with the spherical organic particles, And that the optical properties of the film can be kept constant while lowering the bulk density of the particles, thereby lowering the frequency of breakage in the biaxial stretching process, thereby completing the present invention.
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 method for producing a pore-forming material by using a spherical organic particle, which is insoluble in polyester resin and contains white inorganic particles, White polyester that can minimize the frequency of breakage during the biaxial stretching process by improving the optical characteristics by increasing the reflection efficiency to the particles and lowering the bulk density of the particles constituting the film to lower the possibility of breakage due to stretching during film formation Film and a method for producing the same.
These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.
The above object is achieved by a white polyester reflective film characterized by comprising a polyester resin and spherical organic particles which are insoluble in the polyester resin and contain white inorganic particles therein.
Here, the organic particles are at least one of a polyolefin resin such as polyethylene, polypropylene, polybutene or polymethylpentene, a cyclic polyolefin, a polystyrene resin, a polyacrylic resin, a polycarbonate resin and a polyphenylene sulfide resin particle , And the white inorganic particles are at least one selected from barium sulfate particles, alumina particles, titanium dioxide particles, silicon dioxide particles and calcium carbonate particles.
Preferably, the organic particles are crosslinked acrylic or polystyrene resins, and the white inorganic particles are silicon dioxide particles.
Preferably, the heat-resistant temperature of the organic particles is 240 ° C to 290 ° C.
Preferably, the composition contains 5 to 40 parts by weight of the organic particles based on 100 parts by weight of the polyester resin, and 10 to 40 parts by weight of the white inorganic particles with respect to 100 parts by weight of the organic particles.
Preferably, the particle size of the organic particles is 0.5 to 5.0 mu m.
Preferably, the particle diameter of the white inorganic particles is 0.2 to 0.5 占 퐉.
Preferably, the polyester resin is a copolymerized polyester containing as a polyethylene terephthalate resin a total dicarboxylic acid component or a copolymerization component of 1 to 15 mol% based on the total diol component.
Further, the above object is also achieved by a resin composition comprising a polyester resin and a spherical organic particle which is insoluble in the polyester resin and contains white inorganic particles therein, is molded through an extruder to produce an unoriented sheet A second step of cooling the formed unstretched sheet, a third step of uniaxially stretching the cooled unoriented sheet to produce a uniaxially stretched film, and a third step of stretching the uniaxially stretched film to two axes A fourth step of stretching the biaxially stretched film to produce a biaxially stretched film, and a fifth step of heat treating the biaxially stretched film.
Here, the heat-resistant temperature of the organic particles is 240 ° C to 290 ° C.
The above object is also achieved by a reflective sheet using a white polyester reflective film produced by the above-described method for producing a white polyester reflective film.
According to the present invention, there is provided a process for producing a white polyester reflection film having a structure having pores inside a film through a biaxial stretching process by melt-extruded white polyester sheet, It is possible to improve the optical characteristic by increasing the reflection efficiency compared to the existing spherical particles by generating pores using the spherical organic particles including the particles as nuclei.
In addition, it has the effect of lowering the bulk density of the particles constituting the film, preventing breakage in the biaxial stretching process, and improving the process stability.
Thus, the reflective sheet using the white polyester film containing the white inorganic particles in the spherical organic particles of the present invention can be used for a backlight device for image display, a reflective sheet of a lamp reflector, a reflective sheet of an illumination device, A sheet, a rear reflector sheet for a solar cell, and the like.
1 is a conceptual view for explaining a conventional reflective film and a phenomenon in which light is reflected thereby,
FIG. 2 is a conceptual diagram illustrating a white polyester reflective film according to an embodiment of the present invention and a phenomenon in which light is reflected thereby.
Hereinafter, the present invention will be described in detail with reference to embodiments and drawings 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 white polyester reflection film according to the present invention is characterized in that it comprises a polyester resin and spherical organic particles (10) which are compatible with polyester resin and contain white inorganic particles (30) therein. In other words, the raw resin composition contains white inorganic particles of high refractive index in the interior of the polyester resin and the spherical organic particles which are non-compatible therewith, thereby improving the light reflection characteristic and lowering the bulk density of the particles to reduce the frequency of rupture in the biaxial stretching process, To a white polyester reflective film.
1, which is a conceptual diagram illustrating a conventional reflection film and a phenomenon in which light is reflected thereby, and a white polyester reflection film according to an embodiment of the present invention, and FIG. 2 As can be seen, according to the white polyester reflection film according to an embodiment of the present invention, unlike the prior art, FIG. 1, the polyester resin and the white inorganic particles (30) The
The polyester resin used as the base resin of the polyester film among the resin composition (hereinafter also referred to as "raw resin composition") is composed of a dicarboxylic acid component and a diol component, and a polyethylene terephthalate having a high film- . As the dicarboxylic acid component, it is preferable to use terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, adipic acid and sebacic acid, The component may be selected from ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, 1,6-hexanediol, and the like.
The content of the polyester resin in the resin composition is preferably 60 to 85% by weight, more preferably 70 to 80% by weight. At this time, if the content of the polyester resin is out of the above range, it is impossible to form a film containing a large number of cavities. When polyethylene terephthalate is used as the base resin, it is preferably 1 to 15 mol%, more preferably 3 to 14 mol%, and most preferably 5 to 13 mol%, based on the total dicarboxylic acid component, % Of copolymerized polyester or a copolymerized polyester containing 1 to 15 mol%, more preferably 3 to 14 mol%, and most preferably 5 to 13 mol% of a copolymerizable component per total diol component It is good to use. At this time, if it is less than 1 mol%, it is difficult to form a film containing a large number of cavities, whereas when it exceeds 15 mol%, film formation is also difficult. The dicarboxylic acid component may be selected from the group consisting of isophthalic acid, 2,6-naphthalene dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, adipic acid and sebacic acid. And the diol component may be selected from ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, 1,6-hexanediol, and the like. Among the above-mentioned copolymerization components, it is preferable to use isophthalic acid or 2,6-naphthalenedicarboxylic acid in order to obtain good film formability, and 1,4-cyclohexanedicarboxylic acid having an effect of stabilizing the dispersion state of the non- Methanol is preferably used.
The spherical organic particles which are incompatible with the polyester resin in the resin composition and contain white inorganic particles therein are not particularly limited, and any organic material may be used. In the organic system, polyolefin resins such as polyethylene, polypropylene, polybutene and polymethylpentene, cyclic polyolefin, polystyrene resin, polyacrylic resin, polycarbonate resin, polyphenylene sulfide resin particle and the like can be used. These may be homopolymers or may be used in combination of two or more. Particularly, a resin having a large difference in critical surface tension from a polyester resin and hardly being deformed by heat treatment after stretching is preferable, and among these, a crosslinked acrylic or polystyrene resin is most preferable.
The content of the spherical organic particles is preferably 5 to 40 parts by weight, more preferably 10 to 30 parts by weight, based on 100 parts by weight of the polyester resin. If the amount is less than 5 parts by weight, the effect of whitening becomes blurred and it becomes difficult to obtain a high reflectance. When the amount exceeds 40 parts by weight, mechanical properties such as strength of the film itself decrease, The risk of breakage is increased. The crosslinked polystyrene type resin used as the spherical organic particles used herein is separated from the polyester composition and the heat resistance temperature at which the mass reduction is 5% or less is measured using a thermogravimetric analyzer. The heat resistance temperature of the organic particles is preferably 240 to 290 ° C Do.
The particle size of the organic particles is preferably 0.5 to 5.0 mu m.
On the other hand, in the present invention, spherical organic particles including white inorganic particles means that inorganic particles are contained in the polymer in a strict sense.
The kind of the white inorganic particles in the resin composition is not particularly limited, and any of the inorganic particles may be used. Examples of the inorganic material include calcium carbonate, titanium dioxide, silicon dioxide, barium sulfate, and alumina. These may be used alone, or two or more of them may be used in combination. Particularly, silicon dioxide which is advantageous for light reflection due to a difference in refractive index from polystyrene as an organic particle is preferable. That is, high refractive index white inorganic particles are preferable. The content of the white inorganic particles is preferably 10 to 40 parts by weight, more preferably 15 to 30 parts by weight, based on 100 parts by weight of the spherical organic particles. If it is contained in an amount of less than 10 parts by weight, scattering light by the inorganic particles is insufficient and sufficient light reflectivity can not be obtained, that is, the light reflecting effect becomes dim and the high reflectance becomes difficult to obtain. When the amount exceeds 40 parts by weight, It is easy to break and the film-forming stability remarkably decreases. The crosslinked polystyrene resin used as the spherical particles used herein is separated from the polyester composition, and the heat resistance temperature at which the mass reduction is 5% or less is measured using a thermogravimetric analyzer.
The white inorganic particles preferably have a particle size of 0.2 to 0.5 占 퐉 or less. This is because if the particle size of the inorganic particles is less than 0.2 탆, dispersion in the organic particles is difficult, and if the particle size exceeds 0.5 탆, the organic particles may be broken by the impact and the film formability is undesirably deteriorated.
The raw resin composition may contain various additives such as a fluorescent whitening agent, a crosslinking agent, a heat stabilizer, an oxidation stabilizer, an ultraviolet absorber, an organic lubricant, an inorganic fine particle, a filler, An antistatic agent, a nucleating agent, a dye, a dispersing agent, a coupling agent and the like may be added.
Next, a method of manufacturing a white polyester reflective film according to an embodiment of the present invention will be described. As a preferable example in the later-described examples of the present invention, crosslinked polystyrene resin and silicon dioxide were used as spherical particles which are incompatible with polyester resin and contain white inorganic particles.
A method of producing a white polyester reflective film according to an embodiment of the present invention includes: preparing a polyester resin and a resin composition containing spherical organic particles which are incompatible with the polyester resin and contain white inorganic particles therein A first step of forming an unstretched sheet by molding through an extruder, a second step of cooling the formed unstretched sheet, and a second step of uniaxially stretching the cooled unoriented sheet to form a uniaxially stretched film A fourth step of biaxially stretching the uniaxially stretched film to produce a biaxially stretched film, and a fifth step of heat treating the biaxially stretched film.
That is, the method of producing a white polyester reflective film according to the present invention is a method of controlling the size and number of spherical organic particles including white inorganic particles which are non-compatible with polyester resin in the raw resin composition, And improving the optical characteristics and reducing the frequency of breakage in the biaxial stretching process, thereby inducing stability of the film formation.
The first step is a step of producing an unstretched sheet, which comprises forming a resin composition comprising a polyester resin and spherical organic particles which are insoluble in the polyester resin and contain white inorganic particles therein, Thereby producing an unstretched sheet. In the present invention, [SOLIOSTA] (Nippon Catalysts) can be used as the particles, and among them, cross-linked polystyrene particles of silicon dioxide and hybrid type can be preferably used. The spherical organic particles preferably have a heat-resistant temperature of 240 to 290 ° C. If the heat-resistant temperature is less than 240 占 폚, when the polyester resin and the spherical particles are melt-kneaded by using an extruder or the like and discharged into a sheet, it is difficult to maintain the shape of the particles by plastic deformation of the organic particles, If the temperature is higher than 290 ° C, the degree of crosslinking of the particles is high and the particles are easily broken. Accordingly, the heat resistant temperature of the spherical organic particles used in the raw material composition of the first step of the present invention is more preferably 250 to 270 占 폚. At this time, the heat-resistant temperature is determined at a temperature at which the weight is reduced by 5% when the temperature is raised at a heating rate of 5 ° C / minute using a thermogravimetric analyzer.
The method of blending the spherical organic particles containing the white inorganic particles in the polyester composition can be carried out by using the known methods (a) to (c).
Specifically, the method (A) is a method in which particles are added to a polyester and melt-kneaded, and the method (B) is a method of producing a master pellet in which a large amount of particles are added, And these are kneaded with a polyester containing no additives to contain a predetermined amount of additives. In addition, the method (C) may be carried out by directly using the master pellet (B). At this time, in the embodiment of the present invention, the mixing method of the particles is carried out by the method (b) or (c) in consideration of the dispersibility of the particles.
Next, the second step of the manufacturing method of the present invention is to cool the unstretched sheet formed in the first step in the casting drum. Since this step is well known to those skilled in the art, detailed description is omitted.
Next, the third step of the manufacturing method of the present invention is a step of monoaxially stretching the cooled unoriented sheet to produce a uniaxially stretched film, wherein the cooled unoriented sheet is subjected to roll heating, infrared heating (Heater) Is heated by a heating means and is stretched in the longitudinal direction to obtain a uniaxially stretched film. Preferably, the stretching is carried out using the main speed difference of two or more rolls, and the stretching temperature is set to a temperature not lower than the glass transition temperature (Tg) of the polyester resin, and the stretching magnification is preferably 2.5 to 4.0 times.
Next, the fourth step of the manufacturing method of the present invention is a step of biaxially stretching the uniaxially stretched film to produce a biaxially stretched film, wherein the uniaxially stretched film in the longitudinal direction of the third step Is continuously biaxially stretched in a direction perpendicular to the longitudinal direction (hereinafter also referred to as " width direction "). At this time, the transverse stretching is performed while raising the temperature to 5 to 70 캜 higher than the glass transition point (Tg) starting from a temperature higher than the glass transition point (Tg) of the polyester resin. The temperature rise in the widthwise stretching process may be continuous or may be stepwise (sequential), but the temperature is usually increased sequentially. For example, the width direction stretching zone of the tenter is divided into a plurality of portions along the film running direction, and the temperature is raised by flowing a heating medium at a predetermined temperature for each zone. At this time, the magnification of the widthwise stretching is set to 2.5 to 4.5 times.
Next, the fifth step of the manufacturing method of the present invention is a step of heat-treating the biaxially stretched film, wherein the biaxially stretched film is successively subjected to heat treatment such as heat fixing or heat relaxation while traveling the biaxially stretched film, Film. Thus, in order to complete the crystal orientation of the obtained biaxially stretched film to impart planarity and dimensional stability, the film was subsequently subjected to heat treatment at 120 to 240 캜 for 1 to 30 seconds in a tenter, uniformly and slowly cooled, To obtain a white polyester film according to the present invention. At this time, during the heat treatment step, a relaxation treatment of 3 to 12% in the width direction or the longitudinal direction may be performed, if necessary.
Further, the present invention provides a white polyester reflective film prepared from the above-described method for producing a white polyester reflective film and a reflective sheet using the same.
The present invention improves the reflectance (%) of the surface of the white polyester reflection film to 100% or more in the light of 550 nm, thereby realizing an optical characteristic favorable for improving the luminance of the backlight. Thus, the reflective sheet using the white polyester reflection film of the present invention can achieve a higher reflectance in the visible light region more efficiently by controlling the diameter and number of organic particles and inorganic particles present in the film, The effect of raising the luminance as the base material for the reflector can be obtained.
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]
20 parts by weight of polystyrene organic spherical particles having a particle diameter of 2 占 퐉 were added to 100 parts by weight of a polyester resin (Toray Industries, Inc., A9093) as an emergency resin for the polyester resin, 5 parts by weight of SOLIOSTAR RA series product (organic spherical particles containing inorganic particles as shown in Fig. The resin composition obtained by mixing the above polyester resin and the SOLIOSTAR RA series product was supplied to an extruder heated at 280 DEG C and formed into a sheet from a die. Thereafter, the molded sheet was cooled and solidified in a casting drum having a surface temperature of 20 DEG C to obtain an unstretched film, which was heated to 3.7 times in the longitudinal direction and then cooled. Subsequently, both ends of the uniaxially stretched film were led to a tenter while being held by a clip, and stretched in a direction perpendicular to the length (width direction) at a magnification of 3.7 in a heated atmosphere. Next, heat setting was performed in a tenter, and the film was cooled to room temperature to obtain a biaxial oriented film.
[Comparative Example 1]
In the above example, when the polymer was supplied to the extruder, the same procedure as in Example was used except that 20 parts by weight of polystyrene particles and 5 parts by weight of silicon dioxide were added to 100 parts by weight of the polyester resin, To give a biaxially oriented film.
[Comparative Example 2]
In the above example, when the polymer was fed to the extruder, a biaxially oriented film was obtained in the same manner as in Example except that the resin composition was 3 parts by weight of polystyrene particles per 100 parts by weight of the polyester resin.
[Comparative Example 3]
In the above example, when the polymer was supplied to the extruder, a biaxially oriented film was obtained by using the same method as that of Example except that the resin composition was 45 parts by weight of polystyrene particles per 100 parts by weight of the polyester resin.
[Comparative Example 4]
A biaxially oriented film was obtained in the same manner as in Example 1 except that polystyrene particles having a particle size of 0.3 占 퐉 were used when the polymer was fed to the extruder.
[Comparative Example 5]
A biaxially oriented film was obtained in the same manner as in Example 1, except that polystyrene particles having a particle size of 7 占 퐉 were used when the polymer was fed to the extruder.
[Comparative Example 6]
A biaxially oriented film was obtained in the same manner as in Example 1, except that the polymer composition was changed to 1 part by weight of silicon dioxide per 100 parts by weight of the polyester resin when the polymer was fed to the extruder.
[Comparative Example 7]
A biaxially oriented film was obtained in the same manner as in Example 1, except that the polymer composition was changed to 10 parts by weight of silicon dioxide per 100 parts by weight of the polyester resin when the polymer was fed to the extruder.
[Comparative Example 8]
A biaxially oriented film was obtained in the same manner as in Example 1, except that, when the polymer was supplied to the extruder, the silicon dioxide particles having a particle size of 0.1 mu m were used.
[Comparative Example 9]
A biaxially oriented film was obtained in the same manner as in Example 1, except that, when the polymer was supplied to the extruder, silicon dioxide particles having a particle size of 0.7 mu m were used.
The properties of the biaxially stretched film according to the above Examples and Comparative Examples 1 to 9 were measured through the following experimental examples, and the results are shown in Table 1 below.
[Experimental Example]
1. Reflectometry
The films prepared in the above Examples and Comparative Examples 1 to 9 were evaluated in the same manner as in Example 1 except that the integrating sphere was attached to a spectrophotometer (UV-3600) manufactured by Shimazu Co., Ltd. and the standard white plate (BaSO 4 ) The reflectance was measured at 550 nm.
2. Total light transmittance measurement
With respect to the films prepared in Examples and Comparative Examples 1 to 9, a sample was vertically placed in an automatic digital haze meter of Nippon Denshoku Co., Ltd., and light having a wavelength of 0 nm to 700 nm was transmitted in a direction perpendicular to the sample placed vertically The values shown were measured.
3. Evaluation of Film Stability
When it is possible to form the film stably for one hour or more, it is judged as "? &Quot;, and breakage occurs within one hour, and if stable film formation is impossible, Respectively.
(탆)
(탆)
(%)
Transmittance (%)
As can be seen from the above Table 1, the white polyester reflection film according to each example is excellent in terms of reflectance (%), total light transmittance (%) and film formability.
However, in Comparative Example 1 in which organic particles and inorganic particles were separately contained, good optical characteristics were shown but film formability was poor, and the content of organic particles or inorganic particles was large. In Comparative Example 4 in which the particle size was large, Comparative Examples 3, 5, 7, and 9 showed high reflectance, but it was found that there was a disadvantage that film formation was disadvantageous due to frequent breakage frequency.
Thus, the reflective sheet using the white polyester film according to the present invention is useful for a backlight device for image display, a reflective sheet of a lamp reflector, a reflective sheet of an illumination device, a reflective signboard for an illuminated signboard, or a backside reflector sheet for a solar battery have.
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.
10: spherical internal pore-induced particles
20: pores formed by spherical inner pore-generating particles
30: high refractive index white inorganic particles
Claims (11)
And a spherical organic particle which is insoluble in said polyester resin and contains white inorganic particles therein.
Wherein the organic particles are at least one of a polyolefin resin such as polyethylene, polypropylene, polybutene or polymethylpentene, a cyclic polyolefin, a polystyrene resin, a polyacrylic resin, a polycarbonate resin and a polyphenylene sulfide resin particle,
Wherein the white inorganic particles are at least one selected from barium sulfate particles, alumina particles, titanium dioxide particles, silicon dioxide particles and calcium carbonate particles.
The organic particles are crosslinked acrylic or polystyrene resins,
Wherein the white inorganic particles are silicon dioxide particles.
Wherein the organic particles have a heat-resistant temperature of 240 ° C to 290 ° C.
And 5 to 40 parts by weight of the organic particles with respect to 100 parts by weight of the polyester resin,
And 10 to 40 parts by weight of the white inorganic particles with respect to 100 parts by weight of the organic particles.
And the particle diameter of the organic particles is 0.5 to 5.0 占 퐉.
Wherein the white inorganic particles have a particle diameter of 0.2 to 0.5 占 퐉.
Wherein the polyester resin is a polyethylene terephthalate resin and is a copolymerized polyester containing a total dicarboxylic acid component or a copolymerization component in an amount of 1 to 15 mol% based on the total diol component.
A first step of producing an unstretched sheet by molding a resin composition comprising a polyester resin and spherical organic particles which are insoluble in said polyester resin and contain white inorganic particles therein through an extruder;
A second step of cooling the molded undrawn sheet,
A third step of uniaxially stretching the cooled unoriented sheet to produce a uniaxially stretched film,
A fourth step of biaxially stretching the uniaxially stretched film to produce a biaxially stretched film;
And a fifth step of heat-treating the biaxially stretched film.
Wherein the heat-resistant temperature of the organic particles is 240 ° C to 290 ° C.
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| KR20210039517A (en) * | 2019-10-01 | 2021-04-12 | 도레이첨단소재 주식회사 | White polyester film and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20210039517A (en) * | 2019-10-01 | 2021-04-12 | 도레이첨단소재 주식회사 | White polyester film and manufacturing method thereof |
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