Polyolefins having improved dimensional stability in three-dimensional printing, articles formed therefrom, and methods thereof
AssigneeBraskem S.A.
InventorsJason Clark, Leonardo Ito, Alexandre da Luz
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Abstract
A polymer composition suitable for manufacturing of isotropic three-dimensional printed articles, the composition including: a matrix phase including a propylene-based polymer or copolymer; and a dispersed phase in the matrix phase, the dispersed phase including an ethylene-based copolymer having a C3-C12 comonomer, wherein the dispersed phase has a different composition than the matrix phase, wherein the matrix phase has a crystallization half-time of less than 60 minutes.
Claims16
A polymer composition suitable for manufacturing of isotropic three-dimensional printed articles, the composition comprising:
- a matrix phase comprising a propylene-based polymer or copolymer;
- and
- a dispersed phase in the matrix phase, the dispersed phase comprising an ethylene-based copolymer having a C3-C12 comonomer, wherein the dispersed phase has a different composition than the matrix phase,
- wherein the matrix phase has a crystallization half-time of less than 60 minutes.
A method for manufacturing a solid article by three-dimensional printing, the method comprising:
- (1) supplying a pellet to a printing head,
- (2) ejecting a hot melt of the pellet from the printing head,
- (3) solidifying the melt to form a printing layer, and
- (4) repeating (1) to (3) to stack the printing layers,
- wherein the pellet comprises a heterophasic copolymer composition comprising:
- a matrix phase being a propylene-based polymer or copolymer;
- and
- a dispersed phase in the matrix phase, the dispersed phase comprising an ethylene-based copolymer having a C3-C12 comonomer, wherein the dispersed phase has a different composition than the matrix phase.
An isotropic three-dimensional printed article comprising a heterophasic copolymer composition comprising:
- a matrix phase being a propylene-based polymer or copolymer;
- and
- a dispersed phase in the matrix phase, the dispersed phase comprising an ethylene-based copolymer having a C3-C12 comonomer, wherein the dispersed phase has a different composition than the matrix phase,
- wherein the article presents at least one of the following features:
- a unidimensional shrinkage of less than 1.8%;
- or
- an isotropic shrinkage ratio in the range of 0.8 to 1.2.
Dependencies are inferred from the claim text.