Fire retardant nylon fibers and methods for making them

A fabric comprising:

• a plurality of fire-retardant nylon fibers having dispersed within internal regions thereof
• an amount of a fire-retardant composition comprising:
• (i) a brominated (Br) organic fire-retardant;
• and
• (ii) a synergist comprising antimony (Sb),
• wherein the brominated organic fire-retardant and the synergist comprising antimony are present in an amount sufficient to provide a weight ratio of elemental Sb and Br (Sb:Br) of from about 1:1 to about 1:10, and
• wherein a major portion thereof is Nylon-6 polymer and/or Nylon-6,6 polymer,
• wherein the plurality of fire-retardant nylon fibers is essentially free of brominated polystyrenes,
• wherein the fabric comprises:
• a fiber of the plurality of fire-retardant nylon fibers having a tensile strength within 20% of the tensile strength of an otherwise identical nylon fiber that does not comprise said fire-retardant composition;
• a moisture vapor transport rate (MVTR) of greater than 100 gms/m2/day;
• an air porosity of about 0.1 ft3/min to about 50 ft3/min;
• or
• a hand and/or a drape of no more than ±1 compared to an otherwise identical fabric that does not comprise said fire-retardant composition.