公开(公告)号：US20230340211A1

公开(公告)日：2023-10-26

申请号：US18304997

申请日：2023-04-21

Applicant: Jabil Inc.

Inventor： Thomas Fry ,  Michael Frye ,  Nicholas John Dippel

IPC: C08J3/16 ,  C08J3/11 ,  C09D5/03 ,  C09D167/00 ,  C09D175/04

CPC classification number: C08J3/16 ,  C08J3/11 ,  C09D5/031 ,  C09D167/00 ,  C09D175/04 ,  C08J2367/00 ,  C08J2375/00

Abstract: Spherical thermoplastic polymer powders useful for additive manufacturing may be made at high throughputs by a method comprising polymer in a dispersing medium at a temperature above the polymer melting temperature (Tm) under shear for short times (e.g., less than 30 minutes) to form a mixture that is then rapid (faster than ambient cooling) cooled below Tm. The method is particularly useful for thermoplastic polymers having a high melt flow index (MFI) or low capillary viscosity at high shear (˜1000 s−1) within 20 or 30° C. of the polymer's melt temperature. The method may also include a crystallizing temperature below Tm and above the glass transition temperature Tg of the polymer to crystallize amorphous polymers or increase the crystallinity of semi-crystalline polymers.