Additive manufacturing employing solvent-free polyimide-containing formulations
AssigneeStratasys, Inc.
InventorsLev Kuno, Mariana Pokrass, Elena Shpayzer
Life of this patent
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Abstract
Formulations usable in additive manufacturing, 3D inkjet printing in particular, of a three-dimensional object that contains a polyimide material, and additive manufacturing utilizing same are provided. The formulations contain a polyimide precursor (e.g., a bismaleimide) and an additional curable material, which is a multifunctional curable material, and are devoid of an organic solvent.
Claims15
A formulation comprising a polyimide precursor and a multifunctional photopolymerizable material, wherein said multifunctional photopolymerizable material is represented by Formula II:
- wherein:
- X is selected from —O— and —O—C(═O)—;
- D is a hydrocarbon chain;
- and
- Rx and Ry are each independently selected from hydrogen, alkyl and cycloalkyl,
- wherein a weight ratio of said polyimide precursor and said multifunctional photopolymerizable material in the formulation ranges from 50:50 to 90:10,
- the formulation being devoid of an organic solvent and featuring a viscosity of from about 16 to about 20 centipoises at 70° C.
A method of additive manufacturing of a three-dimensional object which comprises, in at least a portion thereof, a polyimide-containing material, the method comprising sequentially forming a plurality of layers in a configured pattern corresponding to the shape of the object, thereby forming the object,
- wherein said formation of each of at least a few of said layers comprises dispensing a modeling material formulation which comprises a polyimide precursor and a multifunctional photopolymerizable material;
- and exposing each of the dispensed layers to a curing condition to thereby form a cured modeling material comprising said polyimide-containing material,
- and wherein:
- said modeling material formulation which comprises said polyimide precursor is devoid of an organic solvent;
- and
- said multifunctional photopolymerizable material is represented by Formula II:
- wherein:
- X is selected from —O— and —O—C(═O)—;
- D is a hydrocarbon chain;
- and
- Rx and Ry are each independently selected from hydrogen, alkyl and cycloalkyl,
- wherein a weight ratio of said polyimide precursor and said multifunctional photopolymerizable material in the formulation ranges from 50:50 to 90:10.
Dependencies are inferred from the claim text.