Latexes and associated inkjet inks

Patent metadata

Field	Value
Publication number	US-9550899-B2
Application number	US-201214426652-A
Country	US
Kind code	B2
Filing date	Sep 14, 2012
Priority date	Sep 14, 2012
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

The present disclosure provides latexes and related methods and inkjet inks incorporating such latexes. A latex particulate can comprising multiple intermingled discrete polymer strands, including a low Tg polymer strand having a Tg below 50° C. and a high Tg polymer strand having a Tg at 50° C. or above. The Tg of the high Tg polymer strand can be at least 50° C. greater than the Tg of the low Tg polymer strand, and the average refractive index of the monomers of the low Tg polymer strand can be within 1% of the average refractive index of the monomers of the high Tg polymer strand.

First claim

What is claimed is:

1. A latex particulate, comprising multiple intermingled discrete polymer strands, including:
a low Tg polymer strand having a Tg below 50° C., and
a high Tg polymer strand having a Tg at 50° C. or above;
wherein the Tg of the high Tg polymer strand is at least 50° C. greater than the Tg of the low Tg polymer strand, wherein the average refractive index of the monomers of the low Tg polymer strand is within 1% of the average refractive index of the monomers of the high Tg polymer strand, and wherein the latex comprises intermingled discrete polymer strands of the low Tg polymer and the high Tg polymer, not in a core/shell structure.

2. The latex of claim 1 , wherein the low Tg polymer strand is prepared from multiple co-monomers and the high Tg polymer strand is prepared from the same co-monomers at a different ratio.

3. The latex of claim 2 , wherein the multiple co-monomers are selected that have an average refractive index within 1% of one another.

4. The latex of claim 1 , wherein the average refractive index of the monomers of the low Tg polymer strand are within 0.5% of the average refractive index of the high Tg polymer strand's monomers.

5. The latex of claim 1 , wherein the Tg of the low Tg polymer strand is at or below 20° C. and the Tg of the high Tg polymer strand is at or above 90° C.

6. The latex of claim 1 , wherein the Tg of the high Tg polymer strand is at least 100° C. above the Tg of the low Tg polymer strand.

7. The latex of claim 1 , wherein the monomers of the low Tg polymer strand and the monomers of the high Tg polymer strand are selected from the group of acrylates, methacrylates, vinyls, styrenes, ethylene, vinyl chloride, vinylidene chloride, maleate esters, fumarate esters, itaconate esters combinations thereof, and mixtures thereof.

8. An inkjet ink, comprising:
an ink vehicle; and
a latex particulate, comprising multiple intermingled discrete polymer strands, including:
a low Tg polymer strand having a Tg below 50° C., and
a high Tg polymer strand having a Tg at 50° C. or above;

wherein the Tg of the high Tg polymer strand is at least 50° C. greater than the Tg of the low Tg polymer strand, and wherein the average refractive index of the monomers of the low Tg polymer strand is within 1% of the average refractive index of the monomers of the high Tg polymer strand.

9. The inkjet ink of claim 8 , further comprising a pigment.

10. The inkjet ink of claim 8 , wherein the ink vehicle includes water and co-solvent having a boiling point from 160° C. to 250° C., the co-solvent present in an amount of 1 wt % to 40 wt %; and wherein the ink vehicle includes no more than 3 wt % non-volatile co-solvent and no more than 5 wt % volatile co-solvent.

11. The inkjet ink of claim 8 , wherein the wherein the low Tg polymer strand is prepared from multiple co-monomers and the high Tg polymer strand is prepared from the same co-monomers at a different ratio.

Assignees

• Ingle Jr David Michael
• Cagle Phillip C
• Hewlett Packard Development Co Lp

Inventors

• Ingle Jr David Michael
• Cagle Phillip C

Classifications

• C08L21/02

  Latex · CPC title

• C09D11/106

  containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C09D11/12

  based on waxes or bitumen · CPC title

• C09D11/30

  Inkjet printing inks · CPC title

• C09D11/322 Primary

  Pigment inks · CPC title