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Method of preparing encapsulated pigment dispersions with minimal free polymer
US8957134B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8957134-B2 |
| Application number | US-201114117897-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 15, 2011 |
| Priority date | Jul 14, 2011 |
| Publication date | Feb 17, 2015 |
| Grant date | Feb 17, 2015 |
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Abstract
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A process for encapsulating pigment dispersions is provided where a pigment is dispersed with a polymeric dispersant in an aqueous solvent system. The free polymer dispersant in the pigment dispersion is limited to less than 0.12 grams per gram of pigment. This dispersed pigment is then encapsulated by adding acrylate monomers and optionally acrylic and vinyl monomers and polymerizing. In the encapsulated pigment dispersion the weight ratio of final free polymer to polymer found to the final encapsulated pigment is less than 0.9. The free polymer dispersant is measured by a centrifugation method and the final free polymer is measured by a density gradient centrifugation method. Such encapsulated pigment dispersions may be used in inkjet inks and are stable to heat, aging test conditions, and solvent challenges. Prints from these inks have better durability.
First claim
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What is claimed is: 1. A method of making an encapsulated pigment dispersion comprising steps of a) dispersing a pigment using a polymeric dispersant in an aqueous vehicle wherein the polymeric dispersant not bound to the pigment is less than 0.12 grams per gram of pigment in the pigment dispersion, and the polymer dispersant bound to the pigment is less than 0.33 grams per gram of pigment, where the polymeric dispersant not bound to the pigment is measured by a centrifugation met…
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Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
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- What does patent US8957134B2 cover?
- A process for encapsulating pigment dispersions is provided where a pigment is dispersed with a polymeric dispersant in an aqueous solvent system. The free polymer dispersant in the pigment dispersion is limited to less than 0.12 grams per gram of pigment. This dispersed pigment is then encapsulated by adding acrylate monomers and optionally acrylic and vinyl monomers and polymerizing. In the e…
- Who is the assignee on this patent?
- Lee Hee Hyun, Otley Michael Joseph, Wolfe Michael Stephen, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification C09C3/10. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 17 2015 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).