PURPOSE: To obtain the title fiber having specific physical properties, causing no decline in its water repellency by dry cleaning, etc., excellent in durability, useful for clothing, etc., by heat treatment at a specified temperature or higher of fibers produced by spinning a specific addition copolymer.
CONSTITUTION: The objective fiber ≥0.2 (atom ratio) in the F1s/C1s value determined by ESCA can be obtained by heat treatment at ≥150°C of fibers produced by spinning an addition copolymer from (A) a compound of formula I [R1 is H or methyl ; R2 is CmH2m (m is 1-10); Rf is 1-20C polyfluoralkyl] and (B) another compound of formula II [X1 and X2 are each H, methyl, Cl, CN, COOR or CONR1R2 (R, R1 and R2 are each H or lower alkyl)] such as acrylonitrile.
ITO HAJIME
FUKUI YUICHI
HAGURA SHIGEKI
