▎ 摘　　要

NOVELTY - A powder composition comprises 60 wt.% or more polyimide particles having average particle size (D50) 20- 120 microns. The material of polyimide particles, is a polymerization product of diamine monomer(s) (I) and dianhydride monomer(s). The polyimide particles material has crystallinity 20 % or less and glass transition temperature 200°C or less. USE - Powder composition is used in three-dimensional polyimide-based body (claimed). DETAILED DESCRIPTION - A powder composition comprises 60 wt.% or more polyimide particles having average particle size (D50) 20- 120 microns. The material of polyimide particles, is a polymerization product of diamine monomer(s) and dianhydride monomer(s). The diamine monomer is selected from at least one of the 6 diamine momoners of formula (I). The polyimide particles material has crystallinity 20 % or less and glass transition temperature 200°C or less. An INDEPENDENT CLAIM is included for three-dimensional polyimide-based body, which is formed by a powder-based additive manufacturing process. The amount of polyimide in the polyimide-based body, is 60 wt.% or more.