Inkjet ink compositions
Novel inkjet ink formulations having a humectant composition, at least one pigment, and at least one compound selected from a binder, a defoamer, a leveling agent, an antibacterial agent, and a neutralizing agent; and water is disclosed. A method for printing on a flexible substrate is further disclosed.
1. A formulation comprising a humectant composition, at least one pigment, and at least one compound selected from:
(a) a binder;
(b) a defoamer;
(c) a leveling agent;
(d) an antibacterial agent;
(e) a neutralizing agent; and
(f) water
wherein:
said humectant composition is at a concentration that ranges from 10% to 40%, by weight, and
said humectant composition comprises at least two different organic compounds each comprising one or more hydroxyl groups, wherein said at least two organic compounds are in a weight ratio that rages from about 0.5 to 1.5 with each other, wherein said formulation comprises between about 15% to about 30%, by weight, of said humectant composition and:
a) between about 3-20%, by weight, of said binder;
b) between about 1-20%, by weight of said pigment
c) between about 0-2% of said leveling agent
d) between about 0-1% of said neutralizing agent, and
e) between 50-70% of water, and wherein said formulation is an ink formulation formulated for priting on a flexible textile substrate.
2. The formulation of claim 1 , wherein said at least one pigment is a microsized or nanosized particle.
3. The formulation of claim 1 , wherein one of said at least two organic compounds is glycerol one of said at least two organic compounds is glycol.
4. The formulation of claim 3 , wherein said glycol is selected from the group consisting of: propylene glycol, polyethylene glycol (PEG), and mono-, di- and tri-propylene glycol.
5. The formulation of claim 3 , wherein said glycol is PEG, wherein said PEG has a molecular weight that ranges from 200 Dalton to 600 Dalton.
6. The formulation of claim 1 , wherein said binder comprises an acrylic polymer having a glass transition temperature (Tg) below 50° C.
7. The formulation of claim 1 , wherein said humectant composition is at a concentration of below 25%, by weight.
8. The formulation of claim 1 , wherein said humectant composition is at a concentration of above 25%, by weight.
9. The formulation of claim 1 , wherein said binder is at a concentration that ranges from 3% to 15%, by weight.
10. The formulation of claim 1 , having a viscosity of 4 cP to 6 cP at 25° C.
11. The formulation of claim 1 , having a viscosity of 6 cP to 8 cP at 25° C.
12. The formulation of claim 1 , having a viscosity of 8 cP to 15 cP at 25° C.