Patent ID: 11970624
Assignee: DUPONT ELECTRONICS, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 7:
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.