Core-shell polyamide powder

摘要

The invention relates to a seeded particle of polyamide (PA) powder composed of a shell made of PA-6, PA-12 or PA-6/12 and of a core made from PA-6, paA-11, PA-12 or PA-6/12, PA 6,12, PA-6,6, PA-8 or PA-4, the core and the shell being either of identical polyamide nature but of different molecular weight, or of different polyamide nature. The particle for which the shell has a melting temperature Tf1 and a crystallization temperature Tc1 and for which the core has a melting temperature Tf2 and a crystallization temperature Tc2, is characterized in that the difference in absolute value between Tf1−Tc1 and/or between Tf2−Tc2 is greater than the difference in absolute values between the melting temperature and the crystallization temperature of a particle of powder seeded by a mineral filler and for which the shell is made of PA6, PA12 or PA6/12.

主权项

1. A seeded polyamide (PA) powder particle comprising a shell of polyamide and a core of polyamide, the core and the shell being either of identical polyamide type but of different molecular mass, or of different polyamide type, wherein the seeded polyamide is obtained by polymerization of amide monomer in the presence of a polyamide seed, and the shell is PA6, PA12 or PA6/12 and the core is PA6, PA11, PA12, PA6/12, PA6,6, PA8 or PA4, and wherein said shell has a melting temperature Tf1 and a crystallization temperature Tc1 and said core has a melting temperature Tf2 and a crystallization temperature Tc2, Tf1, Tc1, Tf2 and Tc2 are such that the difference in absolute value between Tf1−Tc1 and/or between Tf2−Tc2 of said seeded polyamide powder is greater than the difference in absolute value between the melting temperature and the crystallization temperature of a powder particle seeded by silica and having a shell of PA6, PA12 or PA6/12.