公开(公告)号：US20240100506A1

公开(公告)日：2024-03-28

申请号：US18266861

申请日：2021-12-07

Applicant: BASF SE

Inventor： Ruediger Funk ,  Matthias Weismantel ,  Marcus Maemecke

IPC: B01J20/30 ,  B01J20/26 ,  C08F6/00 ,  C08J3/00 ,  C08J3/075 ,  C08J3/16 ,  C08J3/24

CPC classification number: B01J20/3085 ,  B01J20/267 ,  C08F6/008 ,  C08J3/005 ,  C08J3/075 ,  C08J3/16 ,  C08J3/245 ,  B01J2220/68 ,  C08J2333/02

Abstract: A process for producing thermally surface postcrosslinked superabsorbent particles, comprising polymerization of a monomer solution or suspension, static drying of the resultant aqueous polymer gel, comminution of the dried polymer gel, classification of the resultant polymer particles, with removal of excessively small polymer particles as undersize, mixing of the removed undersize with an aqueous solution, said aqueous solution comprising a crosslinker, and recycling of the polymer gel obtained from the undersize into the static drying.