公开(公告)号：US12235580B2

公开(公告)日：2025-02-25

申请号：US17345631

申请日：2021-06-11

Applicant: NISSAN CHEMICAL CORPORATION

Inventor： Takumi Oya ,  Hiroki Yamaguchi ,  Suguru Sassa

IPC: G03F7/11 ,  B01J39/20 ,  B01J41/13 ,  C09D125/18 ,  C09D163/00

Abstract: A method for producing an ion-exchange resin having a water content of 5% by weight or less, a method for producing a lithography coating film forming-composition using the ion-exchange resin, and a method for washing the ion-exchange resin. The methods include the step of passing an organic solvent having a water content of 150 ppm or less through an ion-exchange resin precursor having a water content of 40% by weight or more, where a dehydration efficiency defined by the following equation is 5 or more: Dehydration efficiency=Dehydration rate (%)/[Weight of the organic solvent used per unit weight of the ion-exchange resin precursor (kg/kg)×Washing time (h)].