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US 2023/0416478 A1Published application
Polyester film and method of manufacturing same
AssigneeSK microworks Co., Ltd.
InventorsByeong Jae LIM, Young Min HEO, Chul Kyu KIM, Ki Youn SONG
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Abstract
Disclosed is a polyester film comprising a polycyclohexylenedimethylene terephthalate resin having a degree of crystallinity of 36% or less as measured using a differential scanning calorimeter.
Claims18
A polyester film comprising a polycyclohexylenedimethylene terephthalate resin having a degree of crystallinity of 36% or less as measured using a differential scanning calorimeter,
- wherein the polyester film has a machine direction (MD) tear strength of 240 kg/cm or more and 350 kg/cm or less,
- wherein the polyester film has a transverse direction (TD) tear strength of 280 kg/cm or more and 400 kg/cm or less as measured in accordance with ASTM D1004.
A method of manufacturing a polyester film comprising:
- melting a composition for film manufacturing comprising a polycyclohexylenedimethylene terephthalate resin and extruding the molten composition to form a sheet;
- preheating the sheet obtained by the extruding;
- stretching the sheet obtained by the preheating in a MD to prepare a MD stretched sheet;
- and
- stretching the MD stretched sheet in a TD to prepare a TD stretched sheet and thermosetting the TD stretched sheet to manufacture the polyester film,
- wherein a temperature of the preheating is 80° C. to 87° C. and a temperature of the stretching in the MD is 80° C. to 89° C.
3 more elements
Dependencies are inferred from the claim text.