Ultraviolet blocking acrylic fibers, ultraviolet blocking fabric and fiber product containing the same, and method for manufacturing the same

Ultraviolet blocking modacrylic fibers comprising:

• an anionic surfactant in an amount of 0.15 wt % or more;
• and
• an ultraviolet reflector in an amount of 0.5 wt % or more and 4 wt % or less and/or an ultraviolet absorber in an amount of 0.05 wt % or more and 2 wt % or less,
• wherein an ultraviolet protection factor UPF rating value of the ultraviolet blocking modacrylic fibers measured according to JIS L 1925:2019 is UPF15 or more,
• the anionic surfactant is a monoalkyl sulfate salt and an alkyl benzenesulfonate salt,
• a content of the monoalkyl sulfate salt is 0.010 wt % or more and less than 0.142 wt %, and
• a content of the alkyl benzenesulfonate salt is 0.008 wt % or more and less than 0.140 wt %.