Patent ID: 7858542

Claim:
A flame-retardant mattress comprising an internal structure covered with flame-retardant knit fabric that comprises at least two fibers selected from the group consisting of (A) a halogen-containing fiber, (B) a cellulosic fiber, (C) a flame-retardant cellulose fiber and (D) a polyester fiber, has a weight per unit area of at least 140 g/m 2 and a thickness of at least 0.5 mm and up to 1.4 mm, and contains a flame retardant at a ratio of at least 2% by weight based on the whole fabric, wherein the mattress can thus prevent fire spreading into internal structure in TB603 Flammability Test of State of California, United States, and wherein the knit fabric comprises the flame-retardant cellulosic fiber (C) which is a rayon fiber containing a flame retardant selected from silicic acid and aluminum silicate in an amount of 20 to 50% by weight.