Patent ID: 8133827

Claim:
A staple fiber having a macroscopically homogeneous body comprising a copolymer having a structure derived from the reaction of an amine monomer and a plurality of acid monomers, wherein i) the amine monomer is at least 80 mole percent 4,4′diaminodiphenyl sulfone; and ii) the plurality of acid monomers include those having a structure of Cl—CO—Ar 1 —CO—Cl & Cl—CO—Ar 2 —CO—Cl wherein the plurality of acid monomers has 55 to 85 mole percent of the monomer containing aromatic group Ar 1 and 15 to 45 mole percent of the monomer containing the aromatic group Ar 2 ; and wherein the aromatic group Ar 1 is aromatic group having para-oriented linkages and the aromatic group Ar 2 is a an aromatic group having meta-oriented linkages.