Patent ID: 8424262

Claim:
A compressible polyester fiber thermal insulation batt formed of entangled and melt-bonded polyester fibers, the polyester fibers including from 55-85% by weight of at least one staple fiber and from 15-45% by weight of at least one binder fiber, wherein the average fiber diameter is from 7.0 to 20.5 microns and at least 55% by weight of the fibers are crimped, wherein the insulation batt A) has an uncompressed bulk density of from 5 to 15 kg/m 3 , B) exhibits a lambda value of from 30 to 50 mW/m-K, C) exhibits a lambda*density value of from 250-550 when lambda is expressed in units of mW/m-K and density is expressed in units of kg/m 3 , D) has an uncompressed thickness of from 25-300 mm and E) exhibits a tensile stress at break of at least 4 KPa in at least one of the machine and cross-machine directions.