公开(公告)号：US20170081472A1

公开(公告)日：2017-03-23

申请号：US15311414

申请日：2015-05-13

Applicant: BASF SE

Inventor： Ning ZHU ,  Ruediger HAEFFNER ,  Achim STAMMER ,  Cesar ORTIZ ,  Silke BIEDASEK ,  Faissal-Ali EL-TOUFAILI

IPC: C08G69/16 ,  C08G69/46 ,  C08G69/14

CPC classification number: C08G69/16 ,  C08G69/06 ,  C08G69/14 ,  C08G69/46

Abstract: The present invention provides a process for producing polyamides, which comprises a) providing a monomer composition comprising at least one lactam or at least one aminocarbonitrile and/or oligomers of these monomers, b) reacting the monomer composition provided in step a) in a hydrolytic polymerization at elevated temperature in the presence of water to obtain a reaction product comprising polyamide, water, unconverted monomers and oligomers, c) the reaction product obtained in step b) being fed into at least one kneader (3) and subjected to a postpolymerization, d) optionally forming the reaction product obtained in step c) to obtain polyamide particles, e) optionally treating the reaction product obtained in step c) or the polyamide particles obtained in step d) with at least one extractant.

公开(公告)号：US20210206919A1

公开(公告)日：2021-07-08

申请号：US15999520

申请日：2017-02-16

Applicant: BASF SE

Inventor： Angela ULZHÖFER ,  Simon GRAMLICH ,  Rainer OSTERMANN ,  Achim STAMMER ,  Dirk SIMON ,  Ning ZHU

IPC: C08G69/04 ,  C08G69/16 ,  C08G69/46 ,  C08J3/07 ,  C08J3/14 ,  C08L77/02

Abstract: Process for producing polyamide powders by precipitation The present invention relates to a process for producing polyamide powders and to the polyamide powders obtainable by this process. The present invention additionally relates to the use of the polyamide powder as sintering powder in selective laser sintering.