BIAXIALLY ORIENTED POLYESTER FILM, LAMINATE, AND PACKAGING CONTAINER

• Main Authors: MANABE NOBUYUKI, GOTO TAKAMICHI
• Format: Patent
• Language: English; Japanese
• Published: 08.02.2024
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; GENERAL PROCESSES OF COMPOUNDING; HANDLING THIN OR FILAMENTARY MATERIAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

To provide: a biaxially oriented polyester film that can reduce environmental impact, can reduce a yellow tint, and can inhibit or reduce film rupture that may occur during drawing; a laminate comprising the biaxially oriented polyester film; and a packaging container comprising the laminate.SOLUTION: A biaxially oriented polyester film 8 contains a chemically recycled polyester. In a molecular weight distribution curve obtained by gel permeation chromatography of the biaxially oriented polyester film 8, the area ratio of a region having molecular weight of 1000 or less is from 1.9% to 5.5%, inclusive, of the total peak area. The chemically recycled polyester can reduce environmental impact. The area ratio being less than or equal to 5.5% can reduce a yellow tint. The area ratio being greater than or equal to 1.9% can prevent the stress during drawing in a manufacturing process (i.e., the drawing stress) from excessively increasing, and thus can inhibit or reduce film rupture that may occur during the drawing.SELECTED DRAWING: Figure 1 【課題】環境負荷を軽減することができ、しかも、黄色味を低減することができ、そのうえ、延伸時に生じ得るフィルムの破断を抑制または低減することが可能な二軸配向ポリエステルフィルムを提供することを目的とする。二軸配向ポリエステルフィルムを含む積層体や、積層体を含む包装容器を提供することも目的とする。【解決手段】二軸配向ポリエステルフィルム８はケミカルリサイクルポリエステルを含む。二軸配向ポリエステルフィルム８においてゲル浸透クロマトグラフィーで得られる分子量分布曲線において、分子量１０００以下の領域の面積割合が、全ピーク面積の１．９％以上５．５％以下である。ケミカルリサイクルポリエステルによって環境負荷を軽減することができる。５．５％以下であることによって、黄色味を低減することができる。１．９％以上であることによって、製造過程における延伸時の応力（つまり延伸応力）が過度に大きくなることを防止でき、その結果、延伸時に生じ得るフィルムの破断を抑制または低減することができる。【選択図】図１