Patent ID: 11890809
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Other special machines (Mechanical engineering)
Classification: CPC B  C | IPC B  C

Claim 13:
14. A 3D printing system comprising:
a powder bed material comprising from about 80 wt % to 100 wt % polymer particles, the polymeric particles including a polyalkylene backbone with both ethylene and propylene polymerized monomeric units, wherein from 2 mol % to 15 mol % of the polymerized monomeric units include a grafted side chain having an epoxide moiety;
a fusing agent to selectively apply to the powder bed material, wherein the fusing agent comprises water and a radiation absorber that absorbs electromagnetic energy and converts the electromagnetic energy to heat;
a hardener to selectively apply to the powder bed material, wherein the hardener is present in the fusing agent or is included in a hardening agent that is separate from the fusing agent; and
a radiant energy source positioned to expose a layer of powder bed material to the electromagnetic energy to selectively fuse the polymer particles in contact with the radiation absorber and thereby form a 3D printed article that thermally fused and chemically crosslinked.