Abstract: An infrared-absorbent resin composition including a tungsten-based infrared-absorbent pigment, copolymerized polyethylene terephthalate, and a polyethylene terephthalate homopolymer, wherein the copolymerized polyethylene terephthalate is crystalline.

Abstract: The purpose of the present invention is to provide a resin composition comprising a tungsten-based pigment, and which enables the achievement of high infrared absorption and good moldability, and a molded article and a fiber, each of which contains the resin composition. The present invention relates to an infrared absorbing resin composition comprising a tungsten-based infrared absorbing pigment and a polyethylene terephthalate, and wherein the polyethylene terephthalate is a crystalline copolymerized polyethylene terephthalate which has an intrinsic viscosity of 0.60 or more, and a molded article and a fiber, each of which contains this absorbing resin composition.

Abstract: An antimony-doped tin oxide which comprises tin oxide and antimony oxide and fulfills the following requirement (a) and/or (b): (a) the half-width value (?2?) around 2?=27° as determined by an X-ray diffraction measurement is 0.35 or less; and/or (b) the content of antimony oxide is 0.5 to 10.0 wt % relative to the weight of the antimony-doped tin oxide and the crystallinity, which is a value determined by dividing a peak value of a peak appearing around 2?=27° as determined by an X-ray diffraction measurement by the half-width (?2?), is 18092 or more.