KR20160036195A - Colored polyester film for windows - Google Patents
Colored polyester film for windows Download PDFInfo
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- KR20160036195A KR20160036195A KR1020140127964A KR20140127964A KR20160036195A KR 20160036195 A KR20160036195 A KR 20160036195A KR 1020140127964 A KR1020140127964 A KR 1020140127964A KR 20140127964 A KR20140127964 A KR 20140127964A KR 20160036195 A KR20160036195 A KR 20160036195A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/28—Glass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
Description
본 발명은, 발명은 자동차, 건축물등의 창유리면에 부착시켜 태양광중 자외선 과 열선의 투과를 차단하고, 외부로부터의 프라이버시를 보호함과 동시에 갑작스런 충격에 의해 유리가 파손될 경우, 유리파편의 비산을 방지함으로서 안전사고를 유도할 수 있는 윈도우용 착색 폴리에스테르 필름에 관한 것이다.Disclosure of the Invention The present invention relates to a method for preventing glass scattering of glass fragments by protecting ultraviolet rays and heat rays from sunlight and protecting privacy from the outside, To a colored polyester film for a window which can induce a safety accident.
폴리에스테르 주로 폴리에틸렌테레프탈레이트는 우수한 물리적, 화학적 성질을 가지고 있기 때문에 고분자 가공제품으로 광범위하게 사용되고 있으며, 특히 필름용으로 폴리에틸렌테레프탈레이트 필름은 광범위한 용도의 공업용 소재로 사용되어지고 있다. 또한 라벨용도, 전사용도, 포장용도, 사진용도, 이미지 용도등 주로 대체물로 용도개발이 이루어지고 있다. 그 중 고분자 소재 특히, 착색 폴리에스테르 필름을 이용한 윈도우 필름에 대하여 보면, 한국 특허 등록번호 제10-0252022호에서는 수성호료 용액 중에 최소한 1종의 분산염료를 분산시킨 분산액으로 구성되는 염료 혼합물을 제조하는 공정과 염료 혼합물을 폴리에스테르 필름에 피복시켜 피막층을 형성하는 공정 및 최소한 1종의 염료가 피막층에서 필름 속으로 이염되도록 필름을 가열하는 공정으로 이루어지고, 이때에 염료 혼합물의 점도를 실온에서 500센티포이스 이하로 하는 것을 특징으로 하는 착색 폴리에스테르 필름의 제조방법이 개시된바 있고, 한국 특허 등록번호 제10-0067877호에서는 투명필름의 적어도 어느 한쪽 면에 착색제에 의해 착색된 적어도 1개층의 착색 접착제층을 갖는 착색필름으로서, 상기 착색 접착제층은 접착제로서 폴리에스테르수지를 포함하며, 상기 착색제는 안료와 폴리에스테르 분산제를 포함하여 구성된 착색필름이 소개되고 있다. 또 일본 공개특허인 특개평10-230577, 미국특허인 USP 6,242,081 및 한국 특허 등록번호 10-0082060호에는 염료가 혼입된 중간층을 포함하는 3개층 이상으로 구성된 자동차 창유리 접착용 적층 폴리에스테르 필름이 소개되고 있다. 일본 공개특허인 특개2002-52675, 미국특허 USP 2002/0064650 A 1 및 한국 특허 등록번호 10-0013726에는 중간층에 염료를 함유하는 적어도 3개층의 폴리에스테르 공압출 적층 필름으로 구성되고, 필름의 적어도 일측에 대전방지 코팅부(10 14 Ω이하의 고유 표면저항을 갖는)를 갖는 것을 특징으로 하는 창유리용 이축배향 폴리에스테르 필름이 소개되고 있다. 또 한국 특허 등록번호 10-0145057에서는 마그네슘화합물을 0.1~0.01 중량% 함유하고, 통상의 방법으로 축중합시킨 폴리에스테르 수지에 안트라퀴논계 염료를 착색제로 하여 전체 폴리에스테르 수지에 대해 100~1000ppm 첨가한 폴리에스테르 수지와 착색제를 첨가하지 않은 폴리에스테르 수지를 일정비율로 혼합하고 이를 제막, 연신, 열처리한 이축연신 폴리에스테르 필름의 제조방법이 개시되어 있다.Polyester Polyethylene terephthalate is widely used as a polymer processing product because it has excellent physical and chemical properties. Especially, polyethylene terephthalate film for film is used as industrial material for a wide range of applications. In addition, applications for labeling, transferring, packing, photographing, image use, etc. are mainly being developed as alternatives. As for the window film using the polymer material, especially the colored polyester film, Korean Patent Registration No. 10-0252022 discloses a method for producing a dye mixture composed of a dispersion in which at least one disperse dye is dispersed in an aqueous base solution A step of coating a polyester film with the process and dye mixture to form a coat layer, and a step of heating the film so that at least one kind of dye is transferred into the film in the film layer, wherein the viscosity of the dye mixture is 500 cm And a method of producing a colored polyester film characterized in that the amount of the coloring agent used is at least one layer of a coloring agent Layer, wherein the colored adhesive layer is a polyester And a resin, the coloring agent is a colored film composed introduced, including a pigment and a polyester dispersant. Japanese Patent Application Laid-Open No. 10-230577, USP 6,242,081, and Korean Patent Registration No. 10-0082060 disclose laminated polyester films for automobile windowpane adhesion composed of three or more layers including an intermediate layer containing a dye have. Japanese Patent Application Laid-Open No. 2002-52675, USP 2002/0064650 A1, and Korean Patent Registration No. 10-0013726 disclose a laminated film comprising at least three layers of polyester coextruded laminated films containing a dye in an intermediate layer, Has an antistatic coating portion (having an intrinsic surface resistance of 10 < 14 > OMEGA or less) on a biaxial oriented biaxial oriented polyester film. In Korean Patent Registration No. 10-0145057, a polyester resin containing 0.1 to 0.01% by weight of a magnesium compound and condensation-polymerized by a conventional method is added to 100 to 1000 ppm of an anthraquinone dye as a colorant and added to the entire polyester resin There is disclosed a process for producing a biaxially stretched polyester film in which a polyester resin and a polyester resin not containing a coloring agent are mixed at a certain ratio and the mixture is subjected to film formation, stretching and heat treatment.
본 발명의 목적은, 솔라컨트롤, 비산 방지, 프라이버시 보호 등 다기능성 건축물 및 자동차 창유리에 사용될 컬러필름을 제공함에 있다.It is an object of the present invention to provide a color film to be used for multi-functional buildings such as solar control, anti-scattering, privacy protection, and automobile windowpanes.
본 발명은 상술한 종래기술의 문제점을 해결하기 위해 안출된 것으로서,SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art,
다공성 나노유리가, 적어도 필름 내부 또는 바인더와 함께 코팅된 코팅층에 구비된 것을 특징으로 하는 폴리에스테르 필름이다.Wherein the porous nano glass is provided in at least a coating layer coated inside the film or together with the binder.
또한 본 발명에 있어서, 상기 코팅층은, 자외선 흡수제, 또는 염료를 더 포함하는 것을 특징으로 하는 폴리에스테르 필름이다.Also in the present invention, the coating layer is a polyester film characterized by further comprising an ultraviolet absorber or a dye.
또한 본 발명에 있어서, 상기 바인더는 아크릴계 또는 우레탄계 바인더인 것을 특징으로 하는 폴리에스테르 필름이다.In the present invention, the binder is an acrylic or urethane binder.
또한 본 발명에 있어서, 코팅층의 두께는 0.01 ~ 1㎛인 것을 특징으로 하는 폴리에스테르 필름이다.Further, in the present invention, the polyester film is characterized in that the thickness of the coating layer is 0.01 to 1 占 퐉.
또한 본 발명에 있어서, 상기 다공성 나노유리는, 50 ~ 70 atom% Ti, 0.5 ~ 10 atom% Y, 10 ~ 30 atom% Al, 10 ~ 30 atom% Co를 포함하는 것을 특징으로 하는 폴리에스테르 필름이다.Also, in the present invention, the porous nano glass is a polyester film characterized by containing 50 to 70 atom% Ti, 0.5 to 10 atom% Y, 10 to 30 atom% Al, and 10 to 30 atom% Co .
본 발명은, 단열 효과, 자외선 차단, 비산 방지, 프라이버시 보호 등의 다양한 기능을 건축물 및 자동차 창유리에 부여하는 효과가 있다. 즉, 다공성 나노 소재는 높은 단열도를 지니면서 열반사율이 우수하고 방수, 흡음 등 부가기능이 있어 기존의 단열 및 차열도료의 단점을 보완하였다.INDUSTRIAL APPLICABILITY The present invention has the effect of imparting various functions such as heat insulation effect, ultraviolet ray blocking, scattering prevention, privacy protection, etc. to buildings and automobile windowpanes. In other words, porous nanomaterials have high thermal insulation, excellent heat reflectance, and have additional functions such as waterproofing and sound absorption, thus complementing the disadvantages of existing heat and heat coating materials.
이하, 본 발명에 대하여 상세히 설명한다.
Hereinafter, the present invention will be described in detail.
본 발명은,According to the present invention,
다공성 나노유리가, 적어도 필름 내부 또는 바인더와 함께 코팅된 코팅층에 구비된 것을 특징으로 하는 폴리에스테르 필름이다.Wherein the porous nano glass is provided in at least a coating layer coated inside the film or together with the binder.
다공성 나노유리와 같은 다공성 나노 소재는 높은 단열도를 지니면서 열반사율이 우수하고 방수, 흡음 등 부가기능이 있어 기존의 단열 및 차열도료의 장단점을 보완, 기존 유기질 중공형 소재는 시간경과에 따라 함유된 발표기체의 손실로 단열성능의 저하 문제점 해결한다.Porous nanomaterials, such as porous nano glass, have high thermal insulation and excellent heat reflectance. They have additional functions such as waterproof and sound absorption, which complements the advantages and disadvantages of existing insulation and heat coating materials. The loss of the announcement gas solves the problem of deterioration of the insulation performance.
상기 코팅층은, 당해 기술분야의 통상의 지식을 가진 자(이하, ‘당업자’라한다)가 필요에 따라 자외선 흡수제, 또는 염료를 더 포함할 수 있다.Those skilled in the art (hereinafter referred to as " a person skilled in the art ") may further include an ultraviolet absorber or a dye as necessary.
본 발명의 폴리에스테르 필름의 두께는 25 ~ 100 ㎛인 것이 바람직하다. 25㎛미만에서는 단열 및 프라이버시 보호 효과가 미흡할 우려가 있을 수 있고, 100 ㎛초과에서는, 필름의 두께가 너무 두꺼워서 자동차 유리 등에 부착하여 쓰는데 좋지 않을 수 있다.The thickness of the polyester film of the present invention is preferably 25 to 100 탆. If the thickness is less than 25 mu m, the effect of protecting the adiabatic property and the privacy may be insufficient. If the thickness is more than 100 mu m, the thickness of the film may be too thick.
상기 바인더는 아크릴계 또는 우레탄계 바인더인 것을 사용하는 것이 바람직하다.The binder is preferably an acrylic or urethane binder.
상기 코팅층의 두께는 0.01 ~ 1 ㎛인 것이 바람직하다. 1 ㎛ 초과의 코팅 두께는 인라인상 불가능하며 코팅층의 다공성 나노 유리의 함량이 3% 이상일 경우 코팅층에서 탈락되는 입자가 많아져 불량의 가능성이 증가하고, 0.01 ㎛미만으로 코팅층의 두께가 너무 얇거나 입자가 적을 경우 방열 특성 및 적외선 흡수 기능을 제대로 하지 못할 우려가 있다.The thickness of the coating layer is preferably 0.01 to 1 占 퐉. If the content of the porous nano glass in the coating layer is more than 3%, the number of particles to be separated from the coating layer increases and the possibility of failure increases. If the thickness of the coating layer is too thin or less than 0.01 탆, The heat dissipation characteristics and the infrared absorption function may not be properly performed.
상기 다공성 나노유리는 20 ~ 500㎚ 인 것이 바람직하다.The porous nano glass is preferably 20 to 500 nm.
또한, 상기 다공성 나노유리는, 50 ~ 70 atom% Ti, 0.5 ~ 10 atom% Y, 10 ~ 30 atom% Al, 10 ~ 30 atom% Co에 불순물을 잔량 포함하는 것일 수 있다. 이러한 다공성 금속 유리는 다공성 구조로 인해, 열방출 특성이 우수하면서도, 금속 성질로 인해 열전달이 우수하여 열확산에 유리한 물질이다.
In addition, the porous nano glass may contain impurities in a residual amount of 50 to 70 atom% Ti, 0.5 to 10 atom% Y, 10 to 30 atom% Al, and 10 to 30 atom% Co. Such a porous metal glass is a material favorable for thermal diffusion due to its excellent heat transfer property due to its metallic properties while being excellent in heat release characteristics due to its porous structure.
이하, 본 발명에 대하여 실시예를 들어 보다 더 상세히 설명한다. 이하의 실시예는 발명의 상세한 설명을 위한 것일 뿐, 이에 의해 권리범위를 제한하려는 의도가 아님을 분명히 해둔다.
Hereinafter, the present invention will be described in more detail by way of examples. It is to be understood that the following embodiments are for the purpose of illustration only and are not intended to limit the scope of the present invention.
실시예Example
실시예Example 1 One
폴리에틸렌 테레프탈레이트 수지를 평균입경이 300nm인 다공성 나노 유리 1:0.1 중량비로 혼합하여 마스터 배치를 제조하였다. 상기의 원료를 건조시킨 후, 피이드블록에서 공압출 다이를 통해 압출하여 캐스팅 드럼에서 냉각시켜 쉬트를 제조하였다. 이 쉬트를 종방향으로 75 ~ 130 ℃의 온도 범위에서 3.1배 연신시킨 후 수용성 아크릴에 다공성 나노 유리 1.5% 뿐만 아니라 일반적으로 사용되는 하이드록시벤조페논계와 하이드록시 페닐벤조트리아졸계 자외선 차단제 10% 및 안트라퀴논계 염료를 10% 포함하는 코팅제를 인라인 코터로 코팅한 후, 횡방향으로 90 ~ 145 ℃의 온도 범위에서 3.3배 연신하고, 215~235 ℃의 온도 범위에서 열처리를 한 후, 평균 25 ㎛, 코팅두께 0.2 ㎛의 폴리에틸렌테레프탈레이트 필름을 제조하였다. The polyethylene terephthalate resin was mixed at a weight ratio of 1: 0.1 in the porous nano glass having an average particle size of 300 nm to prepare a master batch. After drying the raw material, the sheet was extruded through a co-extrusion die in a feed block and cooled in a casting drum to produce a sheet. The sheet was stretched 3.1 times in the longitudinal direction at a temperature of 75 to 130 DEG C, and then water-soluble acrylic was coated with not only 1.5% of the porous nano glass but also 10% of the commonly used hydroxybenzophenone-based and hydroxyphenylbenzotriazole-based ultraviolet- Based coating composition containing 10% of an anthraquinone-based dye was coated with an in-line coater and stretched 3.3 times in the temperature range of 90 to 145 캜 in the transverse direction and heat-treated in a temperature range of 215 to 235 캜, To prepare a polyethylene terephthalate film having a coating thickness of 0.2 mu m.
실시예Example 2 2
상기 실시예 1과 동일한 방법으로 방열필름을 제조하되, 폴리에틸렌 테레프탈레이트 수지를 평균입경이 300nm인 다공성 나노 유리 1:0.15 중량비로 혼합하여 마스터 배치를 제조하였다. A heat radiation film was prepared in the same manner as in Example 1 except that polyethylene terephthalate resin was mixed at a weight ratio of 1: 0.15 of porous nano glass having an average particle size of 300 nm to prepare a master batch.
실시예Example 3 3
상기 실시예 1과 동일한 방법으로 방열필름을 제조하되, 코팅층을 양면에 포함하는 이축연신 폴리에틸렌 테레프탈레이트 필름을 제조하였다.A biaxially stretched polyethylene terephthalate film was prepared in the same manner as in Example 1 except that a heat radiation film was prepared and both sides thereof were coated with a coating layer.
실시예Example 4 4
상기 실시예 2과 동일한 방법으로 방열필름을 제조하되, 코팅층을 양면에 포함하는 이축연신 폴리에틸렌 테레프탈레이트 필름을 제조하였다.A biaxially stretched polyethylene terephthalate film was prepared in the same manner as in Example 2 except that a heat radiation film was prepared and the coating layer was provided on both sides.
비교예Comparative Example 1 One
상기 실시예 1과 같이 제조하되, 폴리에틸렌 테레프탈레이트 수지를 다공성 나노 유리 대신 기본적으로 쓰이는 2.7 ㎛ 크기 실리카 1:0.1 중량비로 혼합하여 마스터 배치를 제조하였다.The master batch was prepared as in Example 1 except that polyethylene terephthalate resin was mixed at a ratio of 1: 0.1 by weight of silica of 2.7 占 퐉 in size, which is basically used instead of porous nano glass.
비교예Comparative Example 2 2
상기 실시예 1과 같이 제조하되, 폴리에틸렌 테레프탈레이트 수지를 다공성 나노 유리 대신 기본적으로 쓰이는 2.7 ㎛ 크기 실리카 1:0.15 중량비로 혼합하여 마스터 배치를 제조하였다.
The master batch was prepared as in Example 1 except that the polyethylene terephthalate resin was mixed in a ratio of 1: 0.15 by weight of silica of 2.7 占 퐉 in size, which is basically used instead of porous nano glass.
실험예Experimental Example
상기 실시예 1 내지 4, 및 비교예 1 내지 2에 대해 아래와 같은 물성을 측정하였다.The following properties were measured for Examples 1 to 4 and Comparative Examples 1 and 2.
- 탁도(헤이즈): ASTM D 1003의 방법으로 측정- turbidity (haze): measured by the method of ASTM D 1003
- 평균 자외선 차단율 = 100 - {(T1+T2) × 0.36+(T3+T4) × 0.14}- average UV blocking rate = 100 - {(T 1 + T 2 ) × 0.36+ (T 3 + T 4 ) × 0.14}
여기서, T1 : 310~360nm 파장 영역에서의 최대투과율Here, T 1 : the maximum transmittance in a wavelength range of 310 to 360 nm
T2 : 310~360nm 파장 영역에서의 최소투과율T 2 : Minimum transmittance in a wavelength range of 310 to 360 nm
T3 : 파장 360nm에서 투과율T 3 : transmittance at a wavelength of 360 nm
T4 : 파장 380nm에서의 투과율T 4 : transmittance at a wavelength of 380 nm
- 열전도율: HFM(Heat Flow Meter, Metsch, HFM-436/3/1 Lambda)법으로 측정 - Thermal conductivity: measured by HFM (Heat Flow Meter, Metsch, HFM-436/3/1 Lambda) method
실리카에 비해 다공성 나노 유리를 충진제로 사용할 경우 열전도율이 많이 낮아지는 것을 볼 수 있으며 단열 효과가 우수한 것을 확인할 수 있다. 필름의 두께가 두꺼워 질수록 단열 효과가 우수해 지며 또한 자외선 차단제를 이용하여 자외선 차단율 99%로 윈도우 필름용 이축연신 폴리에스테르 컬러 필름을 만들 수 있었다.
When the porous nano glass is used as a filler, the heat conductivity is much lower than that of silica and it is confirmed that the heat insulating effect is excellent. The thicker the film, the better the adiabatic effect. In addition, it was possible to make a biaxially stretched polyester color film for window film with a UV blocking rate of 99% by using a UV blocking agent.
Claims (5)
The polyester film according to claim 1, wherein the porous nano glass comprises 50 to 70 atom% Ti, 0.5 to 10 atom% Y, 10 to 30 atom% Al, and 10 to 30 atom% Co.
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