Patent ID: 7776945

Claim:
A polyester fiber which simultaneously possesses flame retardancy and light-shielding properties, and thereby stability to UV light, said polyester fiber comprising 0.05 to 5% by weight of a phosphorus based flame retardant, based on phosphorus atoms, 1 to 5% by weight of inorganic fine particles relative to the weight of the fiber for providing light-shielding properties in the polyester fiber, said inorganic fine particles having a particle size distribution which satisfy the following inequality (1): 0.05 μm≦ d 50 ≦1 μm, B 90/10 ≦0.5 μm [1] wherein d 50 is an average particle diameter of inorganic fine particles, and B 90/10 is a difference in the particle diameter between the top 90% of total particle diameters and the bottom 10% of total particle diameters and manganese phosphate as a UV stabilizer, said manganese phosphate being synthesized, by the in sitsu reaction of manganese acetate and phosphoric acid.