| abstract |
A non-coated and uncalendered polyester filament woven fabric useful for an air bag, having a low air permeability even after a dry or wet heat aging, includes a plurality of polyester multifilament warp and weft yarns having (1) a maximum thermal stress of 0.8 g/denier or less determined between room temperature and the melting point of the yarns, at a heating rate of 150 °C/min and at a fixed length of the yarn under an initial load of 0.08 g/denier, (2) a maximum thermal shrinkage of 25% or less determined between room temperature and the melting temperature of the yarn at a heating rate of 150 °C/min under an initial load of 0.08 g/denier without restricting the shrinkage of the yarns, (3) a limiting viscosity number of 0.80 to 0.95 dℓ/g determined in a concentration of 1.2 g/100 mℓ in o-chlorophenol at 25°C, and (4) a content of terminal carboxyl groups of 5 to 35 equivalent per ton. |