Polyketone powder for laser sintering
AssigneeLUMAS Polymers LLC
InventorsThomas Fry, John G. Eue, Steven Kubiak, Zachary Peterson, Nicholas John Dippel, Mathew Artin Torosian
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Abstract
A semicrystalline poly ketone powder useful for additive manufacturing may be made by dissolving a polyketone having differential scanning calorimetry (DSC) monomodal melt peak, at a temperature above 50° C. to below the melt temperature of the polyketone, precipitating the dissolved polyketone by cooling, addition of a nonsolvent or combination thereof. The method may be used to form polyketones having a DSC melt peak with an enthalpy greater than the starting polyketone.
Claims20
A composition comprising a semicrystalline aliphatic polyketone powder that has a melt peak having a melt peak enthalpy of at least 50 joules/gram as determined by differential scanning calorimetry (DSC) using a heating rate of 10° C./min, wherein the semicrystalline aliphatic polyketone is represented by:
- where A is the residue of an alkene monomer converted to a saturated hydrocarbon group, m is from about 1 to 6 and n is at least about 2 to 10,000.
A method for forming an aliphatic polyketone powder useful for making an additive manufactured article comprising;
- (i) dissolving an initial aliphatic polyketone having an onset melt temperature in a solvent above 50° C. to below the onset melt temperature of the initial aliphatic polyketone to form a solution comprised of a dissolved aliphatic polyketone,
- (ii) precipitating the dissolved aliphatic polyketone by cooling the solution, adding a non-solvent to the solution or combination thereof to form the semicrystalline aliphatic polyketone powder, and
- (iii) separating the semicrystalline aliphatic polyketone powder from the solvent, wherein the semicrystalline aliphatic polyketone is represented by:
- where A is the residue of an alkene monomer converted to a saturated hydrocarbon group, m is from about 1 to 6 and n is at least about 2 to 10,000 and has a melt peak and recrystallization peak that fail to overlap.
Dependencies are inferred from the claim text.