Method of printing using ink jet inks comprising a crosslinking pigment dispersion based on diblock polymeric dispersants
The present disclosure provides method of ink jet printing onto a substrate comprising, in any workable order, the steps of: (a) providing an ink jet printer that is responsive to digital data signals; (b) loading the printer with a substrate to be printed; (c) loading the printer with an aqueous ink jet ink comprising an ink vehicle and an aqueous dispersion, wherein the aqueous dispersion comprises a solid particle and a polymeric dispersant that has been crosslinked, wherein the polymeric dispersant is a block copolymer comprising an A block and a B block, wherein the A block is a segment having a block size of about 5 to about 18 units, and comprises at least 50% by weight of a monomer, having the following structure: CH2═CRC(O)O(CHR1CH2O)nR2; wherein R and R1 are H, or methyl; R2 is alkyl of 1-4 carbon atoms or phenyl; and n is about 1 about 20; and the B block is a segment comprising an ionic monomer and at least one hydrophobic monomer; and wherein the dispersant comprises a crosslinkable moiety; wherein the crosslinkable moiety is crosslinked with a crosslinking agent selected from the group consisting of epoxide, carbodiimide, oxazoline, isocyanate, and silane; and wherein the aqueous dispersion has a pH of at least about 8.0; and (d) printing onto the substrate using the aqueous ink jet ink, in response to the digital data signals to form a printed image on the substrate. This method of printing provides images with the requisite optical density and chroma needed for emerging ink jet applications.
E I du Pont de Nemours and Company
C
C09D
inventional
Xiaoqing Patrick F. C. Chad
Li McIntyre Roberts