RECYCLED POLYESTER RESIN AND METHOD FOR PRODUCING RECYCLED POLYESTER RESIN

• Main Authors: ONO KATSUNORI, TEMMAN YUTA, TOMIMORI YASUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 03.03.2023
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; SPINNING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide a copolyester resin using a recycled polyester raw material as a raw material.SOLUTION: There is provided a recycled polyester resin which is a polyester resin containing a component derived from a recycled polyester raw material and satisfies all of the following (1) to (4). (1) When a total amount of all acid components constituting a polyester is defined as 100 mol%, a content of terephthalic acid is 50 to 98 mol% and a content of isophthalic acid is 2 to 50 mol%, (2) when a total amount of all glycol components is defined as 100 mol%, a content of ethylene glycol is 80 mol% or more and the content of diethylene glycol is 4 mol% or less, (3) carboxyl end group concentration is 40 equivalent/t or less and (4) an average pressure increase rate is 0.6 MPa/h or less.SELECTED DRAWING: None 【課題】リサイクルポリエステル原料を原料とする共重合ポリエステル樹脂を提供する。【解決手段】リサイクルポリエステル原料に由来する成分を含むポリエステル樹脂であって、下記の（１）～（４）を全て満足する再生ポリエステル樹脂。（１）ポリエステルを構成する全酸成分の合計量を１００モル％とするとき、５０～９８モル％がテレフタル酸、２～５０モル％がイソフタル酸であり、（２）全グリコール成分の合計量を１００モル％とするとき、エチレングリコールが８０モル％以上、ジエチレングリコールが４モル％以下であり、（３）カルボキシル末端基濃度が４０当量／ｔ以下であり、（４）平均昇圧速度が０．６ＭＰａ／ｈ以下である再生ポリエステル樹脂。【選択図】なし