| 摘要 |
PURPOSE:To obtain the titled gasket, having excellent shape stability at high temperatures, by using aromatic polyamide fibers having specific properties. CONSTITUTION:The aimed gasket obtained by using aromatic polyamide fibers having characteristics of Tm (melting point) >=350 deg.C; Tm-Tex (thermogenic starting point) >=30 deg.C; Xc (crystallinity) >=10% DE (elongation) >=10% DSR (Tm) [dry heat shrinkage at the melting point (Tm)] <=15% and the formula [DSR (Tm+55 deg.C) is dry heat shrinkage (%) at the melting point +55 deg.C]. Furthermore, the above-mentioned fibers are preferably fibers produced from an aromatic polyamide having 1-4C lower alkyl or functional groups selected from amino, sulfone, carboxyl and hydroxyl group or halogen atoms. in the o-position of phenylene groups directly linked to N and/or C of amide bonds.
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