Protective garment comprising fibers comprising copolymers containing structures derived from a plurality of amine monomers including 4,4′ diamino diphenyl sulfone

1. A protective garment comprising a fabric made from a yarn, the yarn being flame-resistant and having fiber comprising a copolymer having a structure derived from the reaction of a plurality of amine monomers and an acid monomer, wherein

i) the plurality of amine monomers comprises 55 to 75 mole percent 4,4′diaminodiphenyl sulfone and at least one monomer present in an amount of 25 to 45 mole percent of the total amount of amine monomers and having the structure

H 2 N—Ar 1 —NH 2 ;

and

ii) at least one first acid monomer having a structure of

Cl—CO—Ar 2 —CO—Cl

the aromatic groups Ar 1 and Ar 2 each being a para-oriented benzene ring, and a second acid monomer having meta-oriented aromatic ring structure present in 30 to 45 parts by weight, based on the total amount of acid monomers; and wherein the yarn is either a spun staple yarn or multifilament continuous yarn.

2. The protective garment of claim 1 wherein the amine monomer containing the aromatic group Ar 1 is paraphenylene diamine.

3. The protective garment of claim 1 wherein the first acid monomer is terephthaloyl chloride.

4. The protective garment of claim 1 wherein the second acid monomer comprises isophthaloyl chloride.

5. The protective garment of claim 1 wherein the flame-resistant yarn has a limiting oxygen index of 21 or greater.

6. The protective garment of claim 5 wherein the flame-resistant yarn has a limiting oxygen index of 26 or greater.

7. The protective garment of claim 5 wherein the flame-resistant yarn has a tenacity of 3 grams per denier (2.7 grams per dtex) or greater.

8. The protective garment of claim 7 wherein the flame-resistant yarn has a tenacity of 4 grams per denier (3.6 grams per dtex) or greater.