Print medium

Patent metadata

Field	Value
Publication number	US-10071585-B2
Application number	US-201415303115-A
Country	US
Kind code	B2
Filing date	May 20, 2014
Priority date	May 20, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

The present disclosure provides a print medium, a printed article, and a method of printing. The print medium can include a thin paper substrate having weight ranging from 40 GSM to 150 GSM, and a pre-treatment coating applied to the thin paper substrate at a weight ranging from 0.3 GSM to 15 GSM. The pre-treatment coating can include from 10 wt % to 80 wt % of a fixer, from 3 wt % to 50 wt % of a latex polymer, and from 5 wt % to 50 wt % of a water holding agent.

First claim

What is claimed is:

1. A print medium, comprising:
a thin paper substrate having a basis weight ranging from 40 GSM to 100 GSM; and
a pre-treatment coating applied to the thin paper substrate at from 0.3 GSM to 15 GSM, the pre-treatment coating, comprising:
from 10 wt % to 80 wt % of a fixer;
from 3 wt % to 50 wt % of a latex polymer; and
from 5 wt % to 50 wt % of a water holding agent.

2. The print medium of claim 1 , wherein the water holding agent is a polyvinyl alcohol, a polyacrylate, a cellulose, a starch, a silica gel, a derivative thereof, or a combination thereof.

3. The print medium of claim 1 , wherein the water holding agent is a starch or polyvinyl alcohol.

4. The print medium of claim 1 , wherein the fixer is a polyvalent salt.

5. The print medium of claim 1 , wherein the latex polymer is selected from the group of polyacrylates, polyvinyls, polyurethanes, ethylene vinyl acetates, styrene acrylic copolymers, styrene butadienes, polymethacrylates, polyacrylic acids, polymethacrylic acids, and combinations thereof.

6. The print medium of claim 1 , further comprising a wax.

7. The print medium of claim 1 , wherein the thin paper substrate is an uncoated or coated, wood fiber, pulp base paper.

8. The print medium of claim 1 , having an increase in measured value for a Hercules Sizing Test, or ΔHST, 2 seconds comparing the thin paper substrate to the print medium after coating.

9. The print medium of claim 1 , wherein the thin paper substrate has a basis weight ranging from 50 GSM to 80 GSM.

10. A printed article, comprising:
a thin paper substrate having a basis weight from 40 GSM to 100 GSM;
a pre-treatment coating applied to the thin paper substrate at from 0.3 GSM to 15 GSM, the pre-treatment coating comprising from 10 wt % to 80 wt % of a fixer, from 3 wt % to 50 wt % of a latex polymer, and from 5 wt % to 50 wt % of a water holding agent; and
an aqueous inkjet ink printed on the pre-treatment coating, wherein after drying of the aqueous inkjet ink, the printed article exhibits no more than a 1.5 mm height difference between unprinted areas and printed areas.

11. The printed article of claim 10 , wherein the printed article exhibits no more than a 1.0 mm height difference between unprinted areas and printed areas.

12. A method of inkjet printing, comprising:
inkjet printing an aqueous inkjet ink onto a print medium, the print medium comprising a thin paper substrate having a basis weight from 40 GSM to 100 GSM and a pre-treatment coating applied to the thin paper substrate at from 0.3 GSM to 15 GSM, the pre-treatment coating comprising from 10 wt % to 80 wt % of a fixer, from 3 wt % to 50 wt % of a latex polymer, and from 35 wt % to 50 wt % of a water holding agent;
holding the aqueous inkjet ink in the pre-treatment coating a period of time before an evaporable solvent from the inkjet ink contacts the thin paper substrate; and
beginning to dry the inkjet ink using a heating element before the period of time expires.

13. The method of claim 12 , wherein the pre-treatment coating further comprises a wax.

14. The method of claim 12 , where the step of beginning to dry the inkjet ink occurs within 3 seconds.

15. The method of claim 12 , wherein the step of holding the aqueous inkjet ink is at least 2 seconds.

16. The print medium of claim 1 , wherein the latex polymer includes a vinyl acetate-based polymer.

17. The print medium of claim 1 , wherein the latex polymer includes an ethylene vinyl acetate.

18. The print medium of claim 1 , wherein pre-treatment coating comprises from 30 wt % to 80 wt % of the fixer.

19. The print medium of claim 1 , having an increase in measured value for a Hercules Sizing Test, or ΔHST, of 3 seconds comparing the thin paper substrate to the print medium after coating.

Assignees

• Hewlett Packard Development Co

Inventors

• Swei Jason
• Vaidyanathan Rajasekar
• Niu Bor-Jiunn

Classifications

• D21H19/60

  Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters · CPC title

• D21H19/34

  comprising cellulose or derivatives thereof · CPC title

• D21H17/66

  Salts, e.g. alums · CPC title

• D21H19/22

  Polyalkenes, e.g. polystyrene · CPC title

• D21H19/64

  Inorganic compounds · CPC title