Polyetherimide composition and associated article and additive manufacturing method
AssigneeSabic Global Technologies B.V.
InventorsSarah E. Grieshaber, Malvika Bihari, Kelly Leung, Vikram K. Daga
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Abstract
A polyetherimide composition includes specific amounts of a polyetherimide, a block polyestercarbonate, a block poly-carbonate-polysiloxane, and a core-shell impact modifier in which the core includes a polysiloxane and the shell includes a poly(alkyl (meth)acrylate). Relative to a corresponding composition lacking the core-shell impact modifier, the polyetherimide composition exhibits increased impact strength while substantially retaining flame retardancy. Also described are associated articles, including articles formed by additive manufacturing, and a method of additive manufacturing.
Claims20
A composition comprising, based on the total weight of the composition:
- 40 to 60 weight percent of a polyetherimide;
- 15 to 50 weight percent of a block polyestercarbonate comprising
- a polyester block comprising resorcinol ester repeat units having the structure
- and
- a polycarbonate block comprising carbonate repeat units having the structure
- wherein at least 60 percent of the total number of R1 groups are aromatic;
- 5 to 15 weight percent of a block polycarbonate-polysiloxane;
- and
- 1.5 to 7 weight percent of a core-shell impact modifier comprising, based on the weight of the core-shell impact modifier,
- 60 to 95 weight percent of a core comprising a polysiloxane, and
- 5 to 40 weight percent of a shell comprising a poly(alkyl (meth)acrylate);
- wherein the composition comprises 0 to 0.8 weight percent of polystyrene-poly(ethylene-butylene)-polystyrene block copolymers.
An article comprising a composition comprising, based on the total weight of the composition:
- 40 to 60 weight percent of a polyetherimide;
- 15 to 50 weight percent of a block polyestercarbonate comprising
- a polyester block comprising resorcinol ester repeat units having the structure
- and
- a polycarbonate block comprising carbonate repeat units having the structure
- wherein at least 60 percent of the total number of R1 groups are aromatic;
- 5 to 15 weight percent of a block polycarbonate-polysiloxane;
- and
- 1.5 to 7 weight percent of a core-shell impact modifier comprising, based on the weight of the core-shell impact modifier,
- 60 to 95 weight percent of a core comprising a polysiloxane, and
- 5 to 40 weight percent of a shell comprising a poly(alkyl (meth)acrylate);
- wherein the composition comprises 0 to 0.8 weight percent of polystyrene-poly(ethylene-butylene)-polystyrene block copolymers.
A method of additive manufacturing, the method comprising:
- melt extruding a molten composition to form a plurality of adjacent layers in a predetermined pattern;
- wherein the molten composition is characterized by a glass transition temperature;
- wherein the molten composition has a temperature 5 to 250° C. greater than the glass transition temperature of the molten composition;
- and
- wherein the molten composition comprises, based on the total weight of the composition,
- 40 to 60 weight percent of a polyetherimide;
- 15 to 50 weight percent of a block polyestercarbonate comprising
- a polyester block comprising resorcinol ester repeat units having the structure
- and
- a polycarbonate block comprising carbonate repeat units having the structure
- wherein at least 60 percent of the total number of R1 groups are aromatic;
- 5 to 15 weight percent of a block polycarbonate-polysiloxane;
- and
- 1.5 to 7 weight percent of a core-shell impact modifier comprising, based on the weight of the core-shell impact modifier,
- 60 to 95 weight percent of a core comprising a polysiloxane, and
- 5 to 40 weight percent of a shell comprising a poly(alkyl (meth)acrylate);
- wherein the composition comprises 0 to 0.8 weight percent of polystyrene-poly(ethylene-butylene)-polystyrene block copolymers.
Dependencies are inferred from the claim text.