Liquid developing agent
US-2015370190-A1 · Dec 24, 2015 · US
Electrostatic ink compositions
US9785078B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9785078-B2 |
| Application number | US-201315025671-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 21, 2013 |
| Priority date | Oct 21, 2013 |
| Publication date | Oct 10, 2017 |
| Grant date | Oct 10, 2017 |
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Abstract
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This disclosure relates to an electrostatic ink composition comprising: a liquid carrier, and particles dispersed in the liquid carrier, wherein the particles comprise a resin and a substantially spherical silver pigment; wherein the substantially spherical silver pigment constitutes at least 30 wt % of the solids of the electrostatic ink composition. Print substrates are also disclosed herein.
First claim
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The invention claimed is: 1. An electrostatic ink composition comprising: a liquid carrier, a charge director, and particles dispersed in the liquid carrier, wherein the particles comprise a resin and a substantially spherical silver pigment; wherein the substantially spherical silver pigment constitutes at least 30 wt % of the solids of the electrostatic ink composition. 2. An electrostatic ink composition according to claim 1 , wherein the substantially spherical silver pigment comprises silver particles, at least some of which have a diameter of at least 80 nm. 3. An electrostatic ink composition according to claim 2 , the silver pigment comprises silver particles, at least some of which have a diameter of at least 150 nm. 4. An electrostatic ink composition according to claim 1 , wherein the silver pigment constitutes at least 50 wt % of the solids of the electrostatic ink composition. 5. An electrostatic ink composition according to claim 1 , wherein silver pigment constitutes at least 80 wt % of the solids of the electrostatic ink composition. 6. An electrostatic ink composition according to claim 1 , wherein the silver pigment constitutes at least 90 wt % of the solids of the electrostatic ink composition. 7. An electrostatic ink composition according to claim 1 , wherein the silver pigment constitutes at least 95 wt % of the solids of the electrostatic ink composition. 8. An electrostatic ink composition according to claim 1 , wherein the resin comprises a polymer having acidic side groups. 9. An electrostatic ink composition according to claim 1 , wherein the resin comprises a polymer selected from a co-polymer of (i) ethylene or propylene and (ii) an ethylenically unsaturated acid of either acrylic acid or methacrylic acid; and ionomers thereof. 10. An electrostatic ink composition according to claim 1 , wherein the liquid carrier constitutes at least 70 wt % of the electrostatic ink composition. 11. An electrostatic ink composition according to claim 1 , wherein the liquid carrier constitutes at least 90 wt % of the electrostatic ink composition. 12. A print substrate having printed thereon an electrostatic ink to form an electrostatic latent image, comprising a charge director, a resin having acidic side groups, and a substantially spherical silver pigment; wherein the substantially spherical silver pigment constitutes 30 wt % or more of the solids of the electrostatic ink. 13. A print substrate according to claim 12 , wherein substantially spherical silver pigment constitutes at least 90 wt % of the solids of the electrostatic ink. 14. A print substrate according to claim 12 , wherein the resin comprises a polymer selected from a co-polymer of (i) ethylene or propylene and (ii) an ethylenically unsaturated acid of either acrylic acid or methacrylic acid; and ionomers thereof. 15. The electrostatic ink composition according to claim 1 , wherein the charge director comprises soya lecithin, a barium sulfonate salt, and an isopropyl amine sulfonate salt. 16. The electrostatic ink composition according to claim 1 , wherein the composition comprises a charge adjuvant. 17. The electrostatic ink composition of claim 16 , wherein the charge adjuvant comprises aluminum distearate or aluminum tristearate.
Assignees
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Classifications
obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title
characterised by the pigment · CPC title
Electrically conductive inks · CPC title
based on artificial resins · CPC title
- G03G9/122Primary
characterised by the colouring agents · CPC title
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- What does patent US9785078B2 cover?
- This disclosure relates to an electrostatic ink composition comprising: a liquid carrier, and particles dispersed in the liquid carrier, wherein the particles comprise a resin and a substantially spherical silver pigment; wherein the substantially spherical silver pigment constitutes at least 30 wt % of the solids of the electrostatic ink composition. Print substrates are also disclo…
- Who is the assignee on this patent?
- Hewlett Packard Indigo Bv
- What technology area does this patent fall under?
- Primary CPC classification G03G9/122. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 10 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).