Acaricide fiber material and process for producing same

A process for producing an acaricide fiber material, comprising the steps of:

• suspending, in an aqueous medium, a solution of an acaricide comprising at least one member selected from the group consisting of N-(fluorodichloromethylthio)-phthalimide, N-dimethyl-N'-phenyl-(N'-fluorodichloromethylthio)-sulfamide, 4-chlorophenyl-3'-iodopropargyl formal, and 2,4,4'-trichloro-2'hydroxydiphenylether, dissolved in a carrier consisting of diethyl phthalate, said diethyl phthalate being present in an amount of 2.5 times to 20 times the weight of the acaride;
• applying the aqueous suspension to a fiber material comprising a number of individual polyester fibers to attach the aqueous suspension to the individual polyester fibers to form a wetted fiber material;
• and
• drying the wetted fibrous material to fix the acaricide dissolved in the carrier to the individual polyester fibers,
• said acaricide being fixed to the fibers in an amount of from 0.5% to 5.0%, based on the weight of the individual polyester fibers.