RESIN COMPOSITION, FRICTION BODY, AND WRITING UTENSIL

To provide a resin composition and a friction body that utilize flexibility and stress relaxation property that are features of a 4-methyl-1-pentene-α-olefin copolymer, where the resin composition reduces a coefficient of static friction and suppresses peeling and damage on a paper surface, when han...

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Hauptverfasser: FUKAGAWA KATSUMASA, UEKUSA TAKAYUKI, YASUI MOTOYASU
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a resin composition and a friction body that utilize flexibility and stress relaxation property that are features of a 4-methyl-1-pentene-α-olefin copolymer, where the resin composition reduces a coefficient of static friction and suppresses peeling and damage on a paper surface, when handwriting and drawing are erased by manual friction, on the other hand, promotes heat discoloration by improving a coefficient of dynamic friction, and can obtain excellent erasability to heat-discoloring ink, and a friction body contains the resin composition.SOLUTION: There are provided a resin composition which contains 10-50 pts.mass of a 4-methyl-1-pentene-α-olefin copolymer (A) satisfying a specific requirement, 10-50 pts.mass of a polyolefin-based thermoplastic elastomer (B), 5-30 pts.mass of an ethylene polymer (C), and 0.1-20 pts.mass of a petroleum resin (D) (provided that the total of (A), (B), (C) and (D) is 100 pts.mass); and a friction body containing the resin composition.SELECTED DRAWING: None 【課題】4-メチル-1-ペンテン・α-オレフィン共重合体の特徴である柔軟性と応力緩和性を生かした樹脂組成物および摩擦体であって、筆跡や描画を手動摩擦により消去する際に、静摩擦係数を低減させて紙面での剥離や破損を抑制し、一方で動摩擦係数を向上させることにより熱変色を促進して、熱変色性インキに対して優れた消去性が得られる樹脂組成物、および該樹脂組成物を含む摩擦体を提供すること。【解決手段】特定要件を満たす4-メチル-1-ペンテン・α-オレフィン共重合体(A)10~50質量部、ポリオレフィン系熱可塑性エラストマー(B)10~50質量部、エチレン重合体(C)5~30質量部、および石油樹脂(D)0.1~20質量部(ただし、(A)、(B)、(C)、および(D)の合計を100質量部とする。)を含む樹脂組成物、および該樹脂組成物を含む摩擦体。【選択図】なし