POLYAMIDE RESIN AND MOLDING CONTAINING THE SAME

• Main Authors: HANAOKA YASUNARI, DOYAMA DAISUKE, KURACHI KOICHIRO, KURAHASHI YOSUKE
• Format: Patent
• Language: English; Japanese
• Published: 28.06.2023
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide a polyamide resin which is excellent in moldability, and mechanical characteristics (tensile elastic modulus and tensile elongation, specifically, tensile elongation at break) even when being molded into a molding.SOLUTION: A polyamide resin has a terminal carboxyl group concentration of 100 μeq/g or more, and [ηrel/ηrc] of more than 0.91 and less than 1.0. ηrel: relative viscosity measured according to JIS K-6920 (96% sulfuric acid, polymer concentration of 10 mg/ml, and 25°C). ηrc: relative viscosity calculated by the following approximate expression (1) from a number average molecular weight Mn. Expression (1): ηrc=K×Mnα. In the expression, K and α are constants determined by measuring the number average molecular weight Mn and relative viscosity ηrel of at least three arbitrary polyamide resins of the same kind as the polyamide resin, and performing fitting so that the measurement values are regarded as Mn and ηrc of Expression (1). In the expression, Mn is the number average molecular weight of the polyamide resin, and is calculated from the terminal carboxyl group concentration (μeq/g).SELECTED DRAWING: None 【課題】成形性に優れ、成形体とした場合の機械的特性（引張弾性率及び引張伸び、具体的には引張破断点伸び）に優れるポリアミド樹脂を提供する。【解決手段】末端カルボキシル基濃度が１００μｅｑ／ｇ以上であり、［ηｒｅｌ／ηｒｃ］が０．９１超～１．０未満である、ポリアミド樹脂。ηｒｅｌ：ＪＩＳ Ｋ ６９２０（９６％硫酸中、ポリマー濃度１０ｍｇ／ｍｌ、２５℃）に準じて測定される相対粘度。ηｒｃ：数平均分子量Ｍｎから以下の近似式（１）によって算出される相対粘度。ηｒｃ ＝ Ｋ × Ｍｎα・・・式（１）（式中、Ｋ及びαは、前記ポリアミド樹脂と同種類の少なくとも３つの任意のポリアミド樹脂について、数平均分子量Ｍｎ及び相対粘度ηｒｅｌを測定し、該測定値がそれぞれ式（１）のＭｎ及びηｒｃであるとしてフィッティングすることにより決定される定数である。式中、Ｍｎは前記ポリアミド樹脂の数平均分子量であり、末端カルボキシル基濃度（μｅｑ／ｇ）から算出される。）【選択図】なし