公开(公告)号：US20230113769A1

公开(公告)日：2023-04-13

申请号：US17801397

申请日：2021-01-22

Applicant: UNITIKA LTD.

Inventor： Maiko SAKAI ,  Norihiro NAITO

IPC: B01J20/20 ,  B01J20/28 ,  C02F1/28 ,  B01J20/26

Abstract: An object of the present invention is to provide a water purification filter comprising activated carbon as a filtration material and a biodegradable polymer as a binder component, which water purification filter has a filtration flow rate sufficient for practical use as a pot-type water purifier while maintaining a certain free residual chlorine filtration capacity, and has a certain degree of hardness and excellent handleability. Provided is a water purification filter obtained by winding a nonwoven sheet containing fibrous activated carbon and a heat fusible core-sheath composite fiber and then heat fusing the sheet, wherein the heat fusible core-sheath composite fiber includes a sheath portion containing a biodegradable polyester resin having a melting point of 80 to 140° C. and a core portion containing a synthetic resin having a melting point at least 20° C. higher than the melting point of the biodegradable polyester resin, and wherein the water purification filter has a density of 0.12 to 0.30 g/cm3 and a specific surface area of 500 to 1800 m2/g.