Print media with a top coating

Patent metadata

Field	Value
Publication number	US-9815312-B2
Application number	US-201214385985-A
Country	US
Kind code	B2
Filing date	Apr 17, 2012
Priority date	Apr 17, 2012
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

In one example, a print medium includes pigment particles sized less than a hundred nanometers and frictional control additives. An undercoating is disposed between the base material and top coating. The undercoat includes a first sub-layer comprising a pigment fixative agent and a second sub-layer comprising a dye fixative agent. The top coating forms a protective and low friction coating over the undercoating.

First claim

What is claimed is:

1. A print medium, comprising:
a porous top coating comprising pigment particles sized less than a hundred nanometers and frictional control additives; and
an undercoating disposed between a base material and said top coating, said undercoating comprising:
a first sub-layer comprising a pigment fixative agent, wherein said pigment fixative agent comprises calcium chloride, calcium acetate, calcium citrate, or combinations thereof;
a second sub-layer comprising a dye fixative agent, wherein said dye fixative agent comprises cationic fixative agents, polydiallyldimethylammonium chloride, polyamines, polyhexamethylene biguanide, or combinations thereof; and
a boundary separating the first sub-layer from the second sub-layer, the boundary having been formed by applying each of the first sub-layer and the second sub-layer separately;

wherein the top coating forms a protective and low friction coating over the undercoating;
and wherein the friction control additives are non-polar and liquid at room temperature.

2. The medium of claim 1 , wherein said second sub-layer is disposed between said first sub-layer and said top coating.

3. The medium of claim 1 , wherein said particles comprise at least one of: clay particles, mineral particles, ground calcium carbonate, precipitated calcium carbonate, talc particles, silica particles, alumina particles, and combinations thereof.

4. The medium of claim 1 , wherein said frictional control additives comprise at least one of: a non-polar hydrocarbon synthetic polymer emulsion or dispersion, polyethylene; synthetic polymers, polyethylene powder, waxes, carnauba waxes, paraffin, lubricants, and combinations thereof.

5. The medium of claim 4 , wherein said top coating comprises a ratio of pigment particles to friction control additives between 90:10 to 99:1.

6. The medium of claim 4 , wherein said top coating is transparent and has a coating weight less than ten grams per square meter.

7. The medium of claim 1 , wherein said undercoat weight is less than twenty grams per square meter, with the first sub-layer comprising a coat weight of at least 3 grams per square meter and the second sub-layer comprising a coat weight of at least 5 grams per square meter.

8. The medium of claim 1 , wherein the second sub-layer comprises a combination of dye and pigment fixative agents.

9. A method of forming a print medium, comprising:
applying a first sub-layer of an undercoating to a surface of a base material, the first sub-layer including a pigment fixative agent, wherein said pigment fixative agent comprises calcium chloride, calcium acetate, calcium citrate, or combinations thereof;
drying the first sub-layer through conduction, convection, radiation, atmospheric conditions, or a combination thereof;
then, applying a second sub-layer of the undercoating over the first sub-layer, the second sub-layer including a dye fixative agent, wherein said dye fixative agent comprises cationic fixative agents, polydiallyldimethylammonium chloride, polyamines, polyhexamethylene biguanide, or combinations thereof;
drying the second sub-layer through conduction, convection, radiation, atmospheric conditions, or a combination thereof, thereby forming said undercoating; and
applying a porous top coating over said undercoating, said top coating comprises particles sized less than a hundred nanometers and hydrophobic, friction control additives, wherein said top coating comprises a ratio of pigment particles to friction control additives between 50:50 to 99:1;
wherein the friction control additives have a liquid state at room temperature.

10. A print medium, comprising:
a porous top coating formed over an undercoating, the top coating comprising a liquid friction control additive; and
said undercoating formed over a base material, the undercoating including:
a first sub-layer including a pigment fixative agent, wherein said pigment fixative agent comprises calcium chloride, calcium acetate, calcium citrate, or combinations thereof;
a second sub-layer including a dye fixative agent, wherein said dye fixative agent comprises cationic fixative agents, polydiallyldimethylammonium chloride, polyamines, polyhexamethylene biguanide, or combinations thereof; and
a boundary separating the first sub-layer from the second sub-layer;

wherein said top coating comprises a coat weight that is less than twenty five percent of an undercoat weight of said undercoating.

11. The medium of claim 10 , wherein said undercoat weight is less than one gram per square meter.

12. The method of claim 9 , wherein said undercoat weight is less than twenty grams per square meter.

13. The medium of claim 10 , wherein the top coating comprises pigment particles and friction control additives, wherein said top coating comprises a ratio of pigment particles to friction control additives between approximately 90:10 to 99:1 and the fiction control additives comprise at least one of: a non-polar hydrocarbon synthetic polymer emulsion or dispersion, polyethylene; synthetic polymers, polyethylene powder, waxes, carnauba waxes, paraffin, and combinations thereof.

14. The medium of claim 1 , wherein said top coating comprises a ratio of pigment particles to friction control additives between 50:50 to 99:1, the friction control additives comprising non-polar materials and a majority of a top surface of the top coating is friction control additives.

15. The medium of claim 10 , wherein a majority of a top surface of the top coating is non-polar, organic material.

16. The medium of claim 1 , wherein the base material includes colorant fixative agents.

17. The medium of claim 1 , wherein the first sub-layer excludes dye fixative agents.

Assignees

• Pal Lokendra
• Fu Xulong
• Alonso Julio Cesar
• Hewlett Packard Development Co Lp

Inventors

• Pal Lokendra
• Fu Xulong
• Alonso Julio Cesar

Classifications

• B05D7/54

  No clear coat specified · CPC title

• B41M2205/34

  Both sides of a layer or material are treated, e.g. coated · CPC title

• B41M2205/40

  Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging · CPC title

• B41M2205/38

  Intermediate layers; Layers between substrate and imaging layer · CPC title

• B41M5/502

  characterised by structural details, e.g. multilayer materials (supports, backcoats or intermediate layers for thermal dye transfer donor and receiver sheets B41M5/41, B41M5/42) · CPC title