The structure containing the manufacturing method of a letter of carboxyl group-containing defiberization

SUBJECT of the Invention The letter of defiberization|beating acrylonitrile-type fiber which has a carboxyl group has the characteristic that the swelling property with respect to water is high， and is made advantageous in terms of powder trappability. However， this characteristic will also produce the side surface in which it is easy to shrink|contract by a heating or drying， and will generate the trouble that the shape stability at the time of a process is bad. The objective of this invention is providing the letter of carboxyl group-containing defiberization|beating acrylonitrile-type fiber which is excellent in shape stability. PROBLEM to be solved It is the letter of defiberization|beating acrylonitrile-type fiber comprised by the polymer which has a 0.2-4.0 mmol/g carboxyl radical weight， and does not substantially have a crosslinked structure by covalent bond， Comprising: Contraction|shrinkage percentage when it is set as the paper shape of 50 g/m 2 of basic weight is 25 % or less， The letter of defiberization|beating acrylonitrile-type fiber characterized by the above-mentioned. SELECTED DRAWINGS Absence