POLYAMIDE-BASED BLOCK COPOLYMER

• Main Authors: HATANAKA YOSUKE, MATSUO KEISUKE, OWARI TOSHIO, ENDO TAKURO
• Format: Patent
• Language: English; Japanese
• Published: 08.12.2014
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; 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; PERFORMING OPERATIONS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

PROBLEM TO BE SOLVED: To provide a biaxially oriented polyamide-based resin film which has excellent laminate strength, low-temperature pinhole resistance, impact resistance, and transparency and maintains good appearance even if it is subjected to sterilization treatment in hot water.SOLUTION: A polyamide-based block copolymer is characterized in that a hard segment is composed of a residue of a polyamide formed from a cyclic lactam having 4-10 carbon atoms and a soft segment is composed of a residue of polyoxytetramethylene glycol having a number average molecular weight of 500-4000. In the polyamide-based block copolymer, the content X (pts.mass) of the hard segment, and the content Y (pts.mass) and the number average molecular weight Mn of the soft segment satisfy formulas (1) and (2), mentioned below, the reduced viscosity is 1.0-2.8 dl/g, and the content of acid terminal groups is 40-190 eq/ton. X+Y=100(pts.mass)...(1). 478.74×Mn≤Y≤93...(2). 【課題】ラミネート強度、低温耐ピンホール性、耐衝撃性、透明性に優れ、熱水中で殺菌処理を施しても良好な外観を維持する二軸配向ポリアミド系樹脂フィルムを提供する。【解決手段】ハードセグメントが炭素数４〜１０の環状ラクタムからなるポリアミドの残基からなり、ソフトセグメントが数平均分子量５００〜４０００のポリオキシテトラメチレングリコールの残基からなるポリアミド系ブロック共重合体であって、前記ハードセグメントの含有量Ｘ（質量部）、並びに前記ソフトセグメントの含有量Ｙ（質量部）と数平均分子量Ｍｎが、下記の式（１）および式（２）を満足し、かつ還元粘度が１．０〜２．８ｄｌ／ｇであり、酸末端基量が４０〜１９０ｅｑ／ｔｏｎであるポリアミド系ブロック共重合体。Ｘ＋Ｙ＝１００（質量部）・・・（１）４７８．７４?Ｍｎ−０．２９８９ Ｙ ９３・・・（２）【選択図】なし