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    • 3. 发明公开
    • Oil-resistant elastomer member
    • ÖlabweisendesElastomerbauteil
    • EP1213311A1
    • 2002-06-12
    • EP01128923.8
    • 2001-12-05
    • HOKUSHIN CORPORATION
    • Shirasaka, Hitoshi, c/o Hokushin Corporation
    • C08G18/42C08G18/86
    • C08G18/4238C08G18/4277C08G18/86
    • The invention provides an elastomer member endowed with oil resistance as well as well-balanced physical properties; i.e., high mechanical strength with excellent low-temperature resistance, heat resistance, and rubber elasticity. The oil-resistant elastomer member has a rubber hardness in accordance with JIS A of 95° or less and an elongation at break of at least 100%, and has oil resistance to a lubricating oil which highly swells an object, the elastomer member being formed by cross-linking a millable polyurethane obtainable through polyaddition of a polyester diol and a diisocyanate, wherein the polyurethane has an ester group concentration of at least 25 wt.% (5.7 mmol/g) and less than 35 wt.% (8 mmol/g) and a urethane group concentration of at least 7 wt.% (1.2 mmol/g) and less than 12 wt.% (2.0 mmol/g).
    • 本发明提供了具有耐油性和良好平衡的物理性能的弹性体构件; 即具有优异的耐低温性,耐热性和橡胶弹性的高机械强度。 耐油性弹性体的橡胶硬度根据JIS A为95℃以下,断裂伸长率为100%以上,并且具有耐高温膨胀物体的润滑油的耐油性,弹性体部件形成 通过交联通过聚酯二醇和二异氰酸酯的加聚获得的可研磨的聚氨酯,其中所述聚氨酯的酯基浓度为至少25重量%(5.7mmol / g)和小于35wt。%(8mmol / g)和至少7重量%(1.2mmol / g)和小于12重量%(2.0mmol / g)的氨基甲酸酯基浓度。