Abstract: A polyester film includes a laminate including a plurality of first layers and a plurality of second layers alternately stacked on the plurality of first layers. Each of the first layers includes lactic acid residues, and each of the second layers includes terephthalate residues and adipic acid residues. The polyester film has an average equivalent noise level of 78 dB or less from a noise level test for film spinning the polyester film 180 degrees at 800 rpm for 30 seconds or more, and has Young's modulus of 280 kgf/mm2 or less.

Abstract: A multilayer film according to the embodiments comprises a laminate including a first layer and a second layer disposed on the first layer; the first layer comprises a polyester resin including diol residues and dicarboxylic acid residues; the second layer comprises a butenediol vinyl alcohol copolymer; and the laminate has an oxygen permeability of 0.1 cc/m2·day·atm or less. The multilayer film provides low oxygen permeability, an interface that is not easily delaminated, and improved processability, and a display device and a packaging material comprising the multilayer film are provided. Accordingly, oxygen ingress from outside into elements of a display device or packaged foods can be effectively blocked. In addition, the multilayer film exhibits excellent processability due to a non-delaminating interface and a small maximum thickness deviation. Furthermore, resins applied to the multilayer film have controlled melting and decomposition temperatures, enabling easy co-extrusion.

Abstract: A multilayer sheet including a transparent film with a total light transmittance of 85% or more in accordance with ISO 13468, a coating layer disposed on a first surface of the transparent film, and an elastic film disposed below a second surface of the transparent film is disclosed. The Martens hardness HM measured on a surface of the coating layer is 180 N/mm2 or more.

Abstract: One or more embodiments disclose a polyester resin composition and a method for manufacturing a polyester film. The method for manufacturing the polyester film comprises: a preparation operation of providing a first composition and a second composition; a melting operation of melting the first and second compositions to provide a first molten resin and a second molten resin; a sheet-forming operation of forming a sheet comprising a sheet laminate in which a first layer derived from the first molten resin and a second layer derived from the second molten resin are alternately laminated using a lamination device; and a film-forming operation of stretching the sheet to provide a polyester film comprising the stretched laminate. The first composition comprises a polymer resin having lactate residues and hydroxyalkanoate residues, and the second composition comprises an aliphatic polyester resin or an aliphatic-aromatic copolyester resin.

Abstract: Disclosed is a painted article comprising a painted article; and a paint protection film laminate adhered to a surface of the painted article. The paint protection film laminate comprises a paint protection film comprising a polyether block amide copolymer. The paint protection film has a yellowness index of 1.2 or less measured according to ASTM E313 after UV irradiation, when the UV irradiation is performed for 72 hours at a power of 3 W using light having a wavelength of one selected from 280 nm to 360 nm. The paint protection film also has a tear strength of 580 gf to 720 gf per 150 ?m thickness, and a storage modulus E0, measured at 0° C. according to ASTM D4065, of 30 MPa to 130 MPa.

Abstract: Disclosed is a paint protection film having a storage modulus measured at a temperature of n ° C. according to ASTM D4065 of En, where n is a number representing a temperature in degrees Celsius, wherein E40/E20 is 0.75 or more and 1.1 or less, wherein the paint protection film has a change index dYI of yellowness according to ASTM E313 before and after a UV irradiation, represented by Equation 1 below, of 0.8 or less, where the UV irradiation is performed for 72 hours at an output of 3 W with a light having wavelength from 280 nm to 360 nm: dYI=|YI?UV_YI|??[Equation 1] in Equation 1, YI is the yellowness of the paint protection film before the UV irradiation, and UV_YI is the yellowness of the paint protection film after the UV irradiation.

Abstract: The polyester film according to the embodiment prepared while the crystallinity of a copolymerized polyester film is controlled can be improved in thermal properties and chemical properties. Specifically, the polyester film has not only an excellent shrinkage rate with respect to temperature, but also excellent adhesive strength by a solvent even when applied to gravure printing, UV curing printing, and VSOP printing, making it suitable for a heat shrinkage process and a seaming process. In addition, the polyester film can be applied to a recycling process since it has an appropriate change in crystals during washing with an aqueous solution of NaOH, and the generation of fusion is suppressed even upon prolonged high-temperature drying.