ETHYLENE/TETRAFLUOROETHYLENE COPOLYMER

• Main Authors: SEKIGUCHI TAKESHI, UCHIDA KAZUNOBU, IWAMATSU YUKO, FUNAOKA TATSUYA, KITAHARA TAKAHIRO, YANO RYOICHI
• Format: Patent
• Language: English; Japanese
• Published: 13.06.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CHEMISTRY; COMPOSITIONS BASED THEREON; CONDUCTORS; ELECTRICITY; INSULATORS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide an ethylene/tetrafluoroethylene copolymer excellent in heat stability, and capable of reducing coloring.SOLUTION: In an ethylene/tetrafluoroethylene copolymer, a thermal decomposition start temperature is 370°C or higher, a yellow index value is -40 or lower, and a yellow index change degree after being heated at 232°C for 168 hours is 100 or lower. In the ethylene/tetrafluoroethylene copolymer, a mol ratio (a)/(b) between a polymerization unit (a) based on ethylene and a polymerization unit (b) based on tetrafluoroethylene is 50-10/50-90.SELECTED DRAWING: None 【課題】熱安定性に優れ、着色を低減できるエチレン／テトラフルオロエチレン共重合体を提供する。【解決手段】熱分解開始温度が３７０℃以上であり、かつ、イエローインデックス値が−４０以下であり、２３２℃で１６８時間加熱後のイエローインデックス変化度が１００以下であるエチレン／テトラフルオロエチレン共重合体。エチレンに基づく重合単位（ａ）とテトラフルオロエチレンに基づく重合単位（ｂ）とのモル比（ａ）／（ｂ）が５０〜１０／５０〜９０であるエチレン／テトラフルオロエチレン共重合体。【選択図】なし