Patent ID: 9499936
Filing Date: 2016-11-22
CPC Classification: D06M,Y10T

Claim Text:
1. A finished fabric with warp and fill yarns comprising a blend of cotton and thermoset fibers wherein said finished fabric has original dimensions in an unstretched condition, said finished fabric having been totally immersed in a bath solution containing a concentration of 25% to 40% of tetrakis hydroxymethyl phosphonium sulphate (THPS), while at least one of the warp and fill yarns are in a transverse stretched condition during immersion wherein the transverse stretched condition precludes longitudinal stretching and wherein the transverse stretched condition is from 5% to 12% greater than the original dimensions in an unstretched condition of the finished fabric, and while so transverse stretched, applying the flame retardant to the fabric and then allowing the fabric to shrink back to its original dimensions wherein the fabric receives its flame retardant treatment while stretched, so that said cotton fibers are opened and more thoroughly and evenly penetrated with said THPS, providing a more permanent and durable fire retardant apparel finished fabric comprising from 1.5% to 4.0% phosphorous content, and able to withstand repeated uses and washings, wherein the said THPS is evenly deposited in the finished fabric and the finished fabric has flame resistant characteristic of a char length of less than 6 inches in accordance with the ASTM F1506 test after the finished fabric has been washed according to Underwriters Laboratories 100IL (industrial laundering).