Patent ID: 11970626
Assignee: DUPONT ELECTRONICS, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 8:
9. 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 aqueous inkjet inks, wherein at least one of the inks comprising a first pigment dispersion and a second pigment dispersion, and wherein said first pigment dispersion forms an aggregation with said aqueous primer composition, and said second pigment dispersion does not form an aggregation with said aqueous primer composition; and
(e) printing onto the primer coated substrate of step (c) using the aqueous inkjet inks in response to digital signals.