Wholly aromatic polyamide fiber synthetic paper sheet

摘要

A wholly aromatic polyamide (aramid) fiber synthetic paper sheet includes 70 - 96 wt% of an aramid staple fiber component which includes 30 wt% or more of a para-type aramid staple fibers each having two or more annular projections (DL1,DL2,DL3) spaced from each other and having an average ratio R/ gamma of the largest diameter R of the annular projections to the smallest diameter gamma of the annular projection-free portions (DS1,DS2,DS3,DS4) of the staple fiber, of 1.1 or more, and 4 - 30 wt% of a binder component, namely a resinous binder and/or heat resistant fibrids.