公开(公告)号：US20250163226A1

公开(公告)日：2025-05-22

申请号：US18512268

申请日：2023-11-17

Applicant: Hexcel Corporation

Inventor： David Grulke ,  Emily Thomsen

IPC: C08J3/00 ,  B29C64/153 ,  B29K71/00

Abstract: A method of preparing a polymer powder composition suitable for selective laser sintering and a powder composition obtained from the same. The polymer composition comprising at least two polyetherketoneketone polymorphs, each of the polymorphs having a different melting peak in a melting temperature range. The polymer is heated at a temperature below the lowest of the polymorphs melting peaks thereby decreasing the melting temperature range of the polymer composition. The treatment is especially useful with Cake B PEKK powder, which is otherwise unusable in SLS. Parts built from the treated powder using SLS have reduced surface anomalies and are easier to remove from the Cake bed.