Inkjet ink and primer fluid set
The present disclosure provides an inkjet ink and primer fluid set containing an aqueous primer composition, an aqueous white inkjet ink, and aqueous non-white colored inkjet inks. The aqueous primer composition forms a coating on a print substrate. This fluid set is particularly suitable for printing on non-porous plastic substrate.
1. An inkjet ink and primer fluid set comprising:
a) an aqueous primer composition comprising a multivalent cation salt and a polymeric binder, wherein said composition forms a coating with a dry thickness of from 0.4 to 5.0 micron upon application onto a non-porous plastic substrate, and said coating results in a haze increase of less than 10 on said substrate, said multivalent cation salt is present at an amount less than 20 wt %, based on the total weight of the primer composition, and said polymeric binder is not soluble in water, is stable in the presence of said multivalent cation, and is selected from the group consisting of urethane polymer, acrylic polymer and vinyl polymer;
b) an aqueous white inkjet ink comprising a titanium oxide pigment dispersion, and a polyurethane binder or an acrylic binder, wherein said titanium oxide pigment dispersion having a particle size with D50 in the range of 200 to 350 nm; and
c) one or more aqueous non-white colored inkjet inks, wherein at least one of the inks comprising a pigment dispersion, and a second polyurethane binder or a second acrylic binder.
2. The fluid set of claim 1 , wherein said aqueous primer composition further comprising silica particles.
3. The fluid set of claim 1 , wherein said coating results in a haze increase of less than 5 on said substrate.
4. The fluid set of claim 1 , wherein said polyurethane binder and said second polyurethane binder are the same.
5. The fluid set of claim 1 , wherein said acrylic binder and said second acrylic binder are the same.
6. The fluid set of claim 1 , wherein said polymeric binder is urethane polymer.
7. The fluid set of claim 1 , wherein said polymeric binder is acrylic polymer.
8. A method of digitally printing an image onto a non-porous plastic substrate comprising the steps of:
(a) providing an inkjet printer that is responsive to digital data signals;
(b) providing a non-porous plastic substrate;
(c) applying an aqueous primer composition comprising a multivalent cation salt and a polymeric binder onto the non-porous plastic substrate to form a coating with a dry thickness of from 0.4 to 5.0 micron, wherein said coating results in a haze increase of less than 10 on said substrate, said multivalent cation salt is present at an amount less than 20 wt %, based on the total weight of the primer composition, and said polymeric binder is not soluble in water, is stable in the presence of said multivalent cation, and is selected from the group consisting of urethane polymer, acrylic polymer and vinyl polymer;
(d) loading the printer with an aqueous white inkjet ink and one or more aqueous non-white colored inkjet inks, wherein said white inkjet ink comprising a titanium oxide pigment dispersion, and a polyurethane binder or an acrylic binder, said titanium oxide pigment dispersion having a particle size of D50 in the range of 200 to 350 nm; and wherein at least one of the aqueous non-white colored inkjet inks comprising a pigment dispersion, and a second-polyurethane binder or a second acrylic binder; and
(e) printing onto the primer coated substrate of step (c) using the white inkjet ink and non-white colored inkjet inks in response to digital signals.
9. The method of claim 8 , wherein said aqueous primer composition comprising silica particles.
10. The method of claim 8 , wherein said coating results in a haze increase of less than 5 on said substrate.
11. The method of claim 8 , wherein said polyurethane binder and said second polyurethane binder are the same.
12. The method of claim 8 , wherein acrylic binder and said second acrylic binder are the same.
13. The method of claim 8 , wherein said polymeric binder is urethane polymer.
14. The method of claim 8 , wherein said polymeric binder is acrylic polymer.
15. The method of claim 8 , wherein said digital signals cause the white inkjet ink to be printed before the non-white colored inkjet inks are printed in step (e).
16. The method of claim 8 , wherein said digital signals cause the white inkjet ink to be printed after the non-white colored inkjet inks are printed in step (e).