Selective deposition modeling materials and method
First Claim
1. A material for use in selective deposition modeling by jetting from an ink jet print head to build a three-dimensional object in layerwise fashion comprising a mixture of:
- a) between about 20 and 45% by weight of paraffin wax;
b) between about 20 and 50% by weight of a hydrocarbon resin, wherein the hydrocarbon resin is a copolymer of α
-methylstyrene and vinyl toluene;
c) between about 10 and 30% by weight of microcrystalline wax selected from the group consisting of a microcrystalline ester wax, a soft microcrystalline wax, a hard microcrystalline wax and mixtures thereof; and
d) between about 2 and 5% by weight of an ethylene-vinyl acetate copolymer,wherein each % by weight is based on the total weight of the mixture, and wherein the material has a viscosity between about 7 and about 30 centipoise at at least one temperature between about 125 and about 135°
C.
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Abstract
A novel thermopolymer material adapted for use in thermal stereolithography. More particularly, a thermopolymer material comprising a mixture of: a low shrinkage polymer resin; a low viscosity material such as paraffin wax; at least one microcrystalline wax; a toughening polymer; a plasticizer. Alternative embodiments further include components to improve the materials ability to transfer heat and to improve strength. The subject material, together with the described process greatly reduce part building distortions while retaining desirable toughness, strength and jetting properties.
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Citations
16 Claims
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1. A material for use in selective deposition modeling by jetting from an ink jet print head to build a three-dimensional object in layerwise fashion comprising a mixture of:
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a) between about 20 and 45% by weight of paraffin wax; b) between about 20 and 50% by weight of a hydrocarbon resin, wherein the hydrocarbon resin is a copolymer of α
-methylstyrene and vinyl toluene;c) between about 10 and 30% by weight of microcrystalline wax selected from the group consisting of a microcrystalline ester wax, a soft microcrystalline wax, a hard microcrystalline wax and mixtures thereof; and d) between about 2 and 5% by weight of an ethylene-vinyl acetate copolymer, wherein each % by weight is based on the total weight of the mixture, and wherein the material has a viscosity between about 7 and about 30 centipoise at at least one temperature between about 125 and about 135°
C. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12, 13, 14, 15, 16)
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- 6. The material of claim 6 for use in selective deposition modeling further comprising up to 4%w of an antioxidant.
Specification