公开(公告)号：US20180066122A1

公开(公告)日：2018-03-08

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: C08J9/18 ,  C08J9/12 ,  B29B7/88 ,  B29B9/06 ,  B29B9/12 ,  B29C44/34 ,  B29C47/00 ,  B29C47/30 ,  B29C47/36

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.