公开(公告)号：US11052570B2

公开(公告)日：2021-07-06

申请号：US15551314

申请日：2016-02-09

Applicant: BASF SE

Inventor： Hans Rudolph ,  Etsuhiro Yamamoto ,  Eiji Negishi ,  Akira Nomura ,  Tatsuro Tomata

IPC: B29B7/88 ,  B29C48/05 ,  B29C48/00 ,  B29C48/345 ,  B29C48/385 ,  B29B9/06 ,  B29C44/34 ,  C08J9/12 ,  B29B9/12 ,  C08J9/34 ,  C08J9/16 ,  C08J9/236 ,  C08J9/18 ,  B29K75/00 ,  B29K101/12 ,  B29C48/04 ,  B29K105/04

Abstract: A process for producing foamed thermoplastic polyurethane particles comprises the steps of a) melting a thermoplastic polyurethane in a first extruder (E1), b) injecting a gaseous blowing agent in a second extruder (E2), c) impregnating the gaseous blowing agent homogeneously into the thermoplastic polyurethane melt in a third extruder (E3), d) extruding the impregnated thermoplastic polyurethane melt through a die plate and granulating the melt in an underwater granulation device under temperature and pressure conditions to form foamed thermoplastic polyurethane particles.