Polyketone powder for laser sintering
AssigneeLUMAS Polymers LLC
InventorsSteven Kubiak, Zachary Peterson, Nicholas John Dippel, Mathew Artin Torosian, Thomas Fry
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Abstract
In one instance a semicrystalline polyketone powder useful for additive manufacturing is comprised of a bimodal melt peak determined by an initial differential scanning calorimetry (DSC) scan at 20° C./min and a D90 particle size of at most 300 micrometers and average particle size of 1 micrometer to 150 micrometers equivalent spherical diameter. In another instance, A composition is comprised of a semicrystalline polyketone powder having a melt peak and a recrystallization peak, wherein the melt peak and recrystallization peak fail to overlap.
Claims17
A composition comprising an aliphatic semicrystalline polyketone powder comprising a mixture of a first aliphatic semicrystalline polyketone powder having a bimodal melt peak determined by an initial differential scanning calorimetry (DSC) scan at 20° C./min and a second aliphatic semicrystalline polyketone powder having a monomodal melt peak determined the DSC scan at 20° C./min and the aliphatic semicrystalline polyketone powder having a D90 particle size of at most 300 micrometers and D50 particle size of 10 micrometers to 125 micrometers equivalent spherical diameter, wherein the semicrystalline polyketone powder is a copolymer of ethylene, carbon monoxide and at least one other alkene monomer.
A composition comprised of an aliphatic semicrystalline polyketone powder having a melt peak and a recrystallization peak as determined by differential scanning calorimetry (DSC) scanned at a 20° C./min heating and cooling rate and a D90 particle size of at most 300 micrometers and D50 particle size of 10 micrometers to 125 micrometers equivalent spherical diameter, wherein the melt peak is monomodal and the melt peak and recrystallization peak fail to overlap, wherein the semicrystalline polyketone powder is a copolymer of ethylene, carbon monoxide and at least one other alkene monomer.
A method for forming an aliphatic polyketone powder useful for making an additive manufactured article comprising:
- (i) reacting carbon monoxide, alkene monomer in the presence of a group 8 through 10 transition metal catalyst to form a raw polyketone powder,
- (ii) recovering the raw polyketone powder, and
- (iii) separating the raw polyketone powder to form the polyketone powder having a D90 particle size of at most 300 micrometers and D50 particle size of 10 micrometer to 125 micrometers equivalent spherical diameter and an oversized polyketone powder, wherein the aliphatic polyketone powder is a copolymer of ethylene, carbon monoxide and at least one other alkene monomer and has a bimodal melt peak determined by an initial differential scanning calorimetry (DSC) scan at 20° C./min, wherein the polyketone powder, raw polyketone powder or oversized polyketone powder is subjected to conditions further crystallizing said polyketone powder.
Dependencies are inferred from the claim text.