Build compositions

Abstract

The present disclosure relates to a build composition for a 3-dimensional printing process. The build composition comprises thermoplastic polymer particles, a first photoluminescent agent and a second photoluminescent agent. The build composition has a spectral signature characteristic of the presence of the first photoluminescent agent and the second photoluminescent agent in combination.

1 .- 10 . (canceled) 
     
     
         11 . A 3-D printed part comprising a thermoplastic polymer composition comprising a first photoluminescent agent and a second photoluminescent agent, wherein the composition has a spectral signature characteristic of the presence of the first luminescent agent and the second photoluminescent agent in combination. 
     
     
         12 . The part as claimed in  claim 11 , wherein the thermoplastic polymer composition comprises a fusing agent, the first photoluminescent agent and the second photoluminescent agent dispersed in a thermoplastic polymer matrix. 
     
     
         13 . A 3-dimensional print material set comprising:
 a build composition comprising thermoplastic polymer particles, a first photoluminescent agent and a second photoluminescent agent, wherein the build composition has a spectral signature characteristic of the presence of the first photoluminescent agent and the second photoluminescent agent in combination; and   an inkjet fusing composition comprising a fusing agent capable of absorbing electromagnetic radiation to produce heat.   
     
     
         14 . A method of analysing a composition comprising a thermoplastic polymer for a spectral signature, the method comprising subjecting the composition to spectroscopic analysis to obtain an absorption or emission spectrum, optionally resolving the spectrum obtained by removing at least some peaks attributable to the thermoplastic polymer from the spectrum to produce a resolved spectrum, and comparing the spectrum or resolved spectrum obtained with a reference spectrum indicative of a spectral signature that is characteristic of the presence of a first photoluminescent agent and a second photoluminescent agent in combination. 
     
     
         15 . The method as claimed in  claim 14 , wherein spectroscopic analysis is emission spectroscopy. 
     
     
         16 . The part as claimed in  claim 12 , wherein the fusing agent is selected from the group consisting of carbon black, near-infrared absorbing dyes, near-infrared absorbing pigments, tungsten bronzes, molybdenum bronzes, metal nanoparticles, and combinations thereof. 
     
     
         17 . The part as claimed in  claim 12 , wherein the fusing agent is colorless. 
     
     
         18 . The part as claimed in  claim 12 , wherein the fusing agent includes a colorant. 
     
     
         19 . The part as claimed in  claim 12 , wherein the fusing agent is capable of absorbing electromagnetic radiation to produce heat. 
     
     
         20 . The part as claimed in  claim 19 , wherein the fusing agent has a temperature boosting capacity sufficient to increase the temperature of the thermoplastic polymer above a melting or softening point of the thermoplastic polymer. 
     
     
         21 . The 3-dimensional print material set as claimed in  claim 13 , wherein a concentration of the fusing agent in the fusing composition ranges from 0.1 wt % to 20 wt %. 
     
     
         22 . The 3-dimensional print material set as claimed in  claim 13 , wherein the fusing composition is colorless or nearly colorless. 
     
     
         23 . The 3-dimensional print material set as claimed in  claim 13 , wherein the fusing composition includes a colorant. 
     
     
         24 . The 3-dimensional print material set as claimed in  claim 13 , wherein the fusing agent is capable of absorbing electromagnetic radiation to produce heat. 
     
     
         25 . The 3-dimensional print material set as claimed in  claim 13 , wherein the fusing agent is selected from the group consisting of carbon black, near-infrared absorbing dyes, near-infrared absorbing pigments, tungsten bronzes, molybdenum bronzes, metal nanoparticles, and combinations thereof.