PROBLEM TO BE SOLVED: To provide a modified cloth that can retain a texture (bending resistance) while efficiently modifying a cloth.SOLUTION: A method for producing a modified cloth in which a cloth containing a polymer A with a melting point and/or glass transition temperature of 50°C or more and 400°C or less is modified, the polymer A being selected from an olefinic polymer, polyester polymer and polyimide polymer, has a step 1 in which a radical containing an atom (α) of an element selected from a group 15 element and a group 16 element and an atom (β) of a group 17 element in one molecule, at a ratio of the number of atoms (α): the number of atoms (β)=1:1-4:1, is irradiated with light.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】製布を効率よく変性しながらも、風合い（剛軟性）を保持できる変性製布を提供すること。【解決手段】１分子中に、１５族元素および１６族元素から選ばれる元素の原子（α）と１７族元素の原子（β）とを、原子（α）の数：原子（β）の数＝１：１～４：１の比で含むラジカルの存在下に光照射する工程１を含む、オレフィン系重合体、ポリエステル系重合体およびポリイミド系重合体から選ばれる、融点および／またはガラス転移温度が５０℃以上４００℃以下である重合体Ａを含む製布を変性した変性製布の製造方法。【選択図】なし
