Providing opaque ink jetted image

Patent metadata

Field	Value
Publication number	US-2017145232-A1
Application number	US-201615218132-A
Country	US
Kind code	A1
Filing date	Jul 25, 2016
Priority date	Nov 24, 2015
Publication date	May 25, 2017
Grant date	—

Abstract

Inkjet printing is carried out on a substrate having a topmost layer comprising aqueous soluble multivalent metal cations and a hydrophilic polymeric binder. An aqueous inkjet ink composition is drawn from a main fluid supply as a continuous stream that is broken into both printing drops and non-printing drops, forming a white printed image on the substrate with the printing drops. The non-printing drops are collected and returned to the main fluid supply. The aqueous inkjet ink composition comprises particles of titanium dioxide in an amount of at least 4 to 15 weight %. The particles of titanium dioxide have a 95 th percentile particle size of less than 200 nm, a 50 th percentile particle size of less than 130 nm, and are dispersed using a dispersing polymer comprising acidic groups. The weight ratio of the particles of titanium dioxide to the dispersing polymer is 19:1 to 2:1.

First claim

1 . A method of inkjet printing, comprising:
providing a substrate that comprises a topmost layer comprising at least 30 weight % of one or more aqueous soluble multivalent metal cations and at least 0.05 g/m 2 of a hydrophilic polymeric binder, ink jetting an aqueous inkjet ink composition from a main fluid supply as a continuous stream that is broken into both printing drops and non-printing drops, forming a white printed image on the substrate with the printing drops, collecting and returning the non-printing drops to the main fluid supply,
wherein:
the aqueous inkjet ink composition comprises particles of titanium dioxide in an amount of at least 4 weight % and up to and including 15 weight %;
the particles of titanium dioxide have a 95 th percentile particle size of less than 200 nm and a 50 th percentile particle size of less than 130 nm;
the particles of titanium dioxide are dispersed within the aqueous inkjet ink composition with a dispersing polymer comprising acidic groups; and
the weight ratio of the particles of titanium dioxide to the dispersing polymer is from 19:1 to and including 2:1.

2 . The method of claim 1 , wherein the weight ratio of the particles of titanium dioxide to the dispersing polymer is from 13:1 to and including 4:1.

3 . The method of claim 1 , wherein the dispersing polymer has a weight average molecular weight of at least 5,000 and up to and including 100,000, and an acid value of at least 100 and up to and including 500.

4 . The method of claim 1 , wherein the particles of titanium dioxide have a 95 th percentile particle size of less than 200 nm and a 50 th percentile particle size of less than 130 nm.

5 . The method of claim 1 , wherein:
the particles of titanium dioxide have a 95 th percentile particle size of less than 200 nm and a 50 th percentile particle size of less than 130 nm; the dispersing polymer has a weight average molecular weight of at least 5,000 and up to and including 100,000, and an acid value of at least 100 and up to and including 500; and the weight ratio of the titanium dioxide particles to the dispersing polymer is from 9:1 to and including 5:1.

6 . The method of claim 1 , wherein the aqueous inkjet ink composition is capable of providing a white printed image.

7 . A method of inkjet printing, comprising:
providing a substrate, and ink jetting an aqueous inkjet ink composition to form a printed image on the substrate, wherein the aqueous inkjet ink composition comprises: pigment colorant particles that are present in an amount of at least 4 weight % and up to and including 15 weight %; a dispersing polymer that is a hexyloxy benzoic acid polymer; a humectant having a molecular weight of less than 1,000; and an aqueous medium, wherein the weight ratio of the pigment colorant particles to the dispersing polymer is from 19:1 to and including 2:1.

8 . A method of inkjet printing, comprising:
providing a substrate, ink jetting an aqueous inkjet ink composition from a main fluid supply as a continuous stream that is broken into both printing drops and non-printing drops, forming a printed image on the substrate with the printing drops, and collecting and returning the non-printing drops to the main fluid supply,
wherein the aqueous inkjet ink composition comprises:
pigment colorant particles that are present in an amount of at least 4 weight % and up to and including 15 weight %;
a dispersing polymer that is a hexyloxy benzoic acid polymer;
a humectant having a molecular weight of less than 1,000; and
an aqueous medium,
wherein the weight ratio of the pigment colorant particles to the dispersing polymer is from 19:1 to and including 2:1.

Assignees

• Eastman Kodak Co

Inventors

• Bauer Charles Leo
• Jones Tamara K

Classifications

• C09D11/40

  Ink-sets specially adapted for multi-colour inkjet printing · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• B41M5/5218

  characterised by inorganic additives, e.g. pigments, clays · CPC title

• C09D11/38

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C08F2800/10

  as molar percentages · CPC title