INKJET BINDER COMPOSITION
An inkjet binder composition includes a vehicle, which includes water and an ether co-solvent. The binder composition also includes a free radical photoinitiator and less than 30 wt % active, based on a total weight of the binder composition, of a single type of an ultraviolet photopolymerizable oligomer including at least two ether groups and at least two acrylate groups.
1 . An inkjet binder composition, comprising:
a vehicle including water and an ether co-solvent;
less than 30 wt %, based on a total weight of the binder composition, of a single type of an ultraviolet photopolymerizable oligomer including at least two ether groups and at least two acrylate groups; and
a free radical photoinitiator.
2 . The inkjet binder composition as defined in claim 1 , wherein the ultraviolet photopolymerizable oligomer is present in an amount ranging from about 15 wt % active to about 24 wt % active, based on the total weight of the binder composition.
3 . The inkjet binder composition as defined in claim 1 , wherein the ultraviolet photopolymerizable oligomer is selected from the group consisting of propoxylated glycerol triacrylate and 1,4-butanediylbis(2-hydroxy-3,1-propanediyl)diacrylate.
4 . The inkjet binder composition as defined in claim 1 , wherein the ether solvent is selected from the group consisting of butyl ethyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, and combinations thereof.
5 . The inkjet binder composition as defined in claim 4 , wherein the vehicle further includes a second co-solvent, a surfactant, an anti-kogation agent, an anti-microbial agent, a dispersant, and a chelating agent.
6 . The inkjet binder composition as defined in claim 5 , wherein the ether co-solvent makes up from about 5 wt % active to about 10 wt % active of the total weight of the inkjet binder composition.
7 . The inkjet binder composition as defined in claim 4 , wherein the vehicle further includes at least one additional co-solvent selected from the group consisting of 2-pyrollidone, pentanol, and combinations thereof.
8 . The inkjet binder composition as defined in claim 7 , wherein the ether co-solvent makes up from about 40 wt % active to about 60 wt % active of the total weight of the inkjet binder composition.
9 . The inkjet binder composition as defined in claim 1 , wherein the ultraviolet photopolymerizable oligomer is soluble or miscible in a combination of the water and the ether co-solvent.
10 . An inkjet binder composition, consisting of:
a vehicle including water, an ether co-solvent, and at least one optional additive;
less than 30 wt % active, based on a total weight of the binder composition, of a single type of an ultraviolet photopolymerizable oligomer including at least two ether groups and at least two acrylate groups; and
a free radical photoinitiator.
11 . The inkjet binder composition as defined in claim 9 , wherein:
the ultraviolet photopolymerizable oligomer is selected from the group consisting of propoxylated glycerol triacrylate and 1,4-butanediylbis(2-hydroxy-3,1-propanediyl)diacrylate; and
the ether solvent is selected from the group consisting of butyl ethyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, and combinations thereof.
12 . The inkjet binder composition as defined in claim 11 , wherein:
the vehicle further includes a second co-solvent, a surfactant, an anti-kogation agent, an anti-microbial agent, a dispersant, and a chelating agent; and
the ether co-solvent makes up from about 5 wt % active to about 10 wt % active of the total weight of the inkjet binder composition.
13 . The inkjet binder composition as defined in claim 11 , wherein:
the vehicle further includes at least one additional co-solvent selected from the group consisting of 2-pyrollidone, pentanol, and combinations thereof; and
the ether co-solvent makes up from about 40 wt % active to about 60 wt % active of the total weight of the inkjet binder composition.
14 . The inkjet binder composition as defined in claim 13 , wherein the water, the 2-pyrollidone, and the pentanol are present in a weight ratio of 1:1:1.
15 . A metal green part, comprising:
metal particles; and
a polymer network binding the metal particles together, the polymer network including polymerized 1,4-butanediylbis(2-hydroxy-3,1-propanediyl)diacrylate or polymerized propoxylated glycerol triacrylate.