Composition based on poly (arylene ether ketone) having improved properties

Abstract

A composition based on poly(ether ether ketone) (PEEK) including poly(ether ketone ketone) (PEKK), wherein the poly(ether ketone ketone) (PEKK) includes a mixture of terephthalic and isophthalic units, the percentage by weight of terephthalic units, with respect to the sum of the terephthalic and isophthalic units, being between 55 and 85%, limits included, and preferably between 55 and 70%, the composition including between 1 and 40%, limits included, preferably between 5 and 40% and more preferably still between 10 and 30% by weight of PEKK, with respect to the total weight of the composition.

1 . A laser-sintered object formed from at least one powder composition, the at least one powder composition comprising:
 a poly(ether ether ketone) (PEEK) and poly(ether ketone ketone) (PEKK), wherein the poly(ether ketone ketone) (PEKK) comprises a mixture of terephthalic and isophthalic units, the percentage by weight of terephthalic units, with respect to the sum of the terephthalic and isophthalic units, being between 55 and 60%, limits included,   wherein the at least one powder composition shows an increase in elongation at break and yield point stress when compared to the elongation at break and yield point stress of a comparative powder composition comprising the PEEK alone without the PEKK.   
     
     
         2 . The laser-sintered object according to  claim 1 , wherein the PEKK is a PEKK blend, each PEKK exhibiting a percentage by weight of terephthalic units, with respect to the sum of the terephthalic and isophthalic units, of between 55 and 60%, limits included. 
     
     
         3 . The laser-sintered object according to  claim 1 , wherein the composition comprises at least one filler and/or at least one additive. 
     
     
         4 . The laser-sintered object according to  claim 1 , wherein the proportion by weight of PEEK in the composition is between 60 and 99%, limits included, with respect to the total weight of the composition. 
     
     
         5 . The laser-sintered object according to  claim 1 , wherein the PEKK comprises a mixture of terephthalic and isophthalic units, the percentage by weight of terephthalic units, with respect to the sum of the terephthalic and isophthalic units, being of the order of 60%. 
     
     
         6 . The laser-sintered object according to  claim 1 , wherein the composition comprises between 5 and 40%, limits included, by weight of PEKK, with respect to the total weight of the composition. 
     
     
         7 . The laser-sintered object according to  claim 1 , wherein the composition comprises between 10 and 30%, limits included, by weight of PEKK, with respect to the total weight of the composition. 
     
     
         8 . The laser-sintered object according to  claim 1 , wherein the proportion by weight of PEEK in the composition is between 70 and 90%, limits included, with respect to the total weight of the composition. 
     
     
         9 . The laser-sintered object according to  claim 1 , wherein the composition comprises between 1 and 40%, limits included, by weight of PEKK, with respect to the total weight of the composition. 
     
     
         10 . The laser-sintered object according to  claim 1 , wherein the composition comprises granules of the PEEK and PEKK. 
     
     
         11 . The laser-sintered object according to  claim 1 , wherein the composition exhibits a slowing in the kinetics of crystallization when compared to the comparative powder composition. 
     
     
         12 . A process for the manufacture of the laser-sintered object according to  claim 1 , the process comprising the step of mixing the components of the composition so as to obtain a homogeneous blend. 
     
     
         13 . The process according to  claim 12 , where the mixing is carried out by melt extrusion, compacting, using a roll mill or by dry blending of powders.