INK-JET OVERCOATS INCLUDING LATEX POLYMERS AND INORGANIC NANO PARTICLES

• US 20120092427A1
• Filed: 06/30/2009
• Published: 04/19/2012
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Ganapathiappan, Sivapackia, Tom, Howard S., Ng, Hou T.
• Granted Patent: US 8,926,081 B2
• Time in Patent Office: Days
• US Class Current: 347/101
• CPC Class Codes: B41J 2/2107 characterised by the ink properties supplying ink in a solid state B41J2/17593
• CPC Class Codes: B41M 7/0027 using protective coatings or layers by lamination or by fusion of the coatings or layers
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 9/08 Ingredients agglomerated by treatment with a binding agent
• CPC Class Codes: C08K 9/10 Encapsulated ingredients
• CPC Class Codes: C09D 5/028 Pigments; Filters
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: C09D 7/68 Particle size between 100-1000 nm

Abstract

The present disclosure is drawn to a nanoparticle containing overcoat composition for use in ink jet printing. The composition can include a liquid vehicle and a composite latex particulate. The composite latex particulate can include inorganic nanoparticles at least partially encapsulated by a polymer. The inorganic nanoparticles can be silica, titania, alumina, zinc oxide, silicates, oxides of indium and tin, and combinations thereof. The inorganic nanoparticles can comprise from about 1 wt % to about 20 wt % of the composite latex particulate. The overcoat composition can be used to improve the properties of ink-jetted images.

Claims

1. An inorganic nanoparticle containing overcoat composition for use in ink jet printing, comprising:

a liquid vehicle,

a composite latex particulate, said composite latex particulate comprising inorganic nanoparticles at least partially encapsulated by a polymer, said inorganic particulates selected from the group consisting of silica, titania, alumina, zinc oxide, silicates, oxides of indium and tin, and combinations thereof,

wherein the inorganic nanoparticle comprises 1 wt % to 70 wt % of the composite latex particulate, and wherein the overcoat composition when printed is transparent or translucent.

2. The overcoat composition of claim 1, wherein the inorganic nanoparticle comprises 5 wt % to 20 wt % of the composite latex particulate.

3. The overcoat composition of claim 1 or 2, wherein the inorganic nanoparticle comprises 10 wt % to 15 wt % of the composite latex particulate.

4. The overcoat composition of one of claims 1 through 3, further comprising a surfactant, said surfactant being present at a weight ratio of about 1:

200 to about 1;

20 with respect to the composite latex particulate.

5. The overcoat composition of one of claims 1 through 4, further comprising a surfactant, said surfactant being present at a weight ratio of about 1:

50 to about 1;

30 with respect to the composite latex particulate.

6. The overcoat composition of one of claims 1 through 5, wherein the polymer comprises polymerized monomers including a hydrophobic monomer and an acid containing monomer, the acid containing monomer being present at from 0.1 wt % to 20 wt % of the polymerized monomers.

7. The overcoat composition of one of claims 1 through 6, wherein the polymer has a Tg of 0°

C. to 125°

C.

8. The overcoat composition of one of claim 1 through 7, wherein the polymer has a Tg of 25°

C. to 75°

C.

9. The overcoat composition of one of claims 1 through 8, wherein the inorganic nanoparticles have a size from 1 nm to 200 nm.

10. The overcoat composition of one of claims 1 through 9, wherein the composite latex particulate has a size from 100 nm to 400 nm.

11. The overcoat composition of one of claims 1 through 10, wherein the composite latex particulate comprises from 0.5 wt % to about 40 wt % of the overcoat composition.

12. The overcoat composition of one of claims 1 through 11, wherein at least one inorganic nanoparticle is fully encapsulated by the polymer.

13. A system for printing durable images, comprising:

a colored ink composition, and

an overcoat composition as in one of claims 1 through 12.

14. The system of claim 13, wherein the colored ink includes a colored pigment.

15. A method of increasing the durability of an ink jetted image, comprising:

ink jetting an image on a substrate using a colored ink composition; and

overcoating the image with the overcoat composition of one of claims 1 through 12.