MULTILAYER CONTAINER, MANUFACTURING METHOD THEREFOR, AND MANUFACTURING METHOD OF RECYCLED POLYESTER

• Main Authors: OTSUKA KOSUKE, DAITO MASAYUKI, YAMADA TAKUMI
• Format: Patent
• Language: English; Japanese
• Published: 02.09.2021
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; 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; 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; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

To provide a multilayer container where recycled polyester exhibiting less hue change can be obtained by suppressing the hue change of the recycled polyester during recycling, and specifically suppressing yellowing; and to provide an efficient manufacturing method of the multilayer container and a manufacturing method of the recycled polyester in which the hue change is suppressed.SOLUTION: Provided are: a multilayer container which comprises a polyester layer containing a polyester resin (X) and a polyamide layer containing a polyamide resin (Y) and a yellowing inhibitor (A), and in which the content of the polyamide resin (Y) is 0.05 to 7.0% by mass based on a total amount of a whole polyamide layer and a whole polyester layer, and the content of the yellowing inhibitor (A) is 1 to 30 ppm based on the total amount of the whole polyamide layer and the whole polyester layer; a manufacturing method therefor; and a manufacturing method of recycled polyester including the step of collecting polyester from the multilayer container.SELECTED DRAWING: None 【課題】リサイクル時の再生ポリエステルの色相変化、特に黄変を抑制し、色相変化の少ない再生ポリエステルを得ることができる多層容器、その多層容器の効率的な製造方法、及び色相変化が抑制された再生ポリエステルの製造方法を提供する。【解決手段】ポリエステル樹脂（Ｘ）を含むポリエステル層と、ポリアミド樹脂（Ｙ）及び黄変抑制剤（Ａ）を含むポリアミド層とを有し、ポリアミド樹脂（Ｙ）の含有量が、全ポリアミド層及び全ポリエステル層の合計量に対して、０．０５〜７．０質量％であり、黄変抑制剤（Ａ）の含有量が、全ポリアミド層及び全ポリエステル層の合計量に対して、１〜３０ｐｐｍである、多層容器、その製造方法、及び前記多層容器からポリエステルを回収する工程を有する、再生ポリエステルの製造方法である。【選択図】なし