Patent ID: 7365032

Claim:
A woven union fabric which is flame retardant said woven fabric being a fabric having a satin structure, comprising: a) a first yarn including, as a main component, a flame retardant halogen-containing fiber made of a composition which comprises: i) 100 parts by weight of an acrylic copolymer of 30 to 70% by weight of an acrylonitril, 30 to 70% by weight of a halogen-containing vinyl monomer and 0 to 10% by weight of a vinyl monomer copolymerizable with them, ii) 10 to 30 parts by weight of an antimony compound, and iii) 8 to 30 parts by weight of a zinc stannate compound; and b) a second yarn which comprises a cellulosic fiber; c) one of said first and second yarns being the warp yarn in said woven fabric and comprising 70% to 30% of said fabric and the other of said first and second yarns being the weft yarn in said woven fabric and comprising 30% to 70% of said fabric, said first and second yarns together comprising 100% of said fabric; d) said fabric having a satin structure having a weight of at least 227 g/m 2 and having flame resistance of M1 class provided in NF P 92-503 burning test wherein the combustion inhibiting effect is provided for both the face on which the second yarn appears to a large extent with relation to the first yarn and the face on which the second yarn appears to only a slight extent, wherein, in the NF P 92-503 burning text, the fabric is tilted at 30° with respect to the horizontal direction, and a 500 W electric heater is brought close to the fabric, and a flame from a burner is applied to the fabric for 5 seconds after 20 seconds, 45 seconds, 75 seconds, 105 seconds, 135 seconds, and 165 seconds from starting the heating with the heater, wherein in the M1 class, the afterflame time is within 5 seconds with respect to all tests of four directions: warp direction of front face, warp direction of back face, weft direction of front face, and weft direction of back face.