Abstract: Polymeric porous particles have a continuous organic solid phase and at least two sets of discrete pores that are isolated from each other within the continuous phase and that have different average sizes. One set of discrete pores has a larger average size than another set of discrete pores by at least 50%. At least one set of discrete pores is free of detectably different marker materials. There porous particles can be prepared using evaporative limited coalescence techniques with especially chosen discrete pore stabilizing hydrocolloids to protect the pores during formation and to provide the different average sizes. The resulting porous particles can be incorporated into articles of various types and having various shapes.

Abstract: Polymeric porous particles have a continuous organic solid phase and at least two sets of discrete pores that are isolated from each other within the continuous phase and that have different average sizes. One set of discrete pores has a larger average size than another set of discrete pores by at least 50%. At least one set of discrete pores is free of detectably different marker materials. There porous particles can be prepared using evaporative limited coalescence techniques with especially chosen discrete pore stabilizing hydrocolloids to protect the pores during formation and to provide the different average sizes. The resulting porous particles can be incorporated into articles of various types and having various shapes.

Abstract: Polymeric porous particles have a continuous solid phase and at least two sets of discrete pores that are isolated from each other within the continuous phase and that have different average sizes. One set of discrete pores has a larger average size than another set of discrete pores by at least 50%. At least one set of discrete pores is free of detectably different marker materials. There porous particles can be prepared using evaporative limited coalescence techniques with especially chosen discrete pore stabilizing hydrocolloids to protect the pores during formation and to provide the different average sizes.

Abstract: An inkjet printing fluid composition including water, a colorant, and a first polymer and a second polymer, wherein the first and second polymers have interactive functional groups and the second polymer is selected to form in the fluid a water soluble associated complex with the first polymer. Each of the first and second polymers are present at a concentration of at least 0.1 wt %, and the first and second polymers are present at a combined concentration of at least 1 wt %.

Abstract: Polymeric porous particles have a continuous solid phase and at least two sets of discrete pores that are isolated from each other within the continuous phase and that have different average sizes. One set of discrete pores has a larger average size than another set of discrete pores by at least 50%. At least one set of discrete pores is free of detectably different marker materials. There porous particles can be prepared using evaporative limited coalescence techniques with especially chosen discrete pore stabilizing hydrocolloids to protect the pores during formation and to provide the different average sizes.

Abstract: An inkjet ink comprising water, colorant, and a dynamic surface active agent at an effective concentration such that dynamic surface tension DST20 min at 20 minutes universal surface age is less than each of dynamic surface tension DST1 sec at 1 second universal surface age and dynamic surface tension DST10 sec at 10 seconds universal surface age, and the difference between DST10 sec and DST20 min is greater than 9.2 mN/m at 21° C. or the difference between DST1 sec and DST20 min is greater than 15.5 mN/m at 21° C., and static surface tension of the ink is less than 50 mN/m. Large dynamic surface tension differences between the indicated time scales yield an optical density improvement in printed images. Anionic fluorosurfactant comprising a phosphate group at concentrations up to about 1 weight percent enables a combination of high optical density and good felt wetting in inkjet cartridges.

Abstract: An inkjet ink comprising water, colorant, and a dynamic surface active agent at an effective concentration such that the ink has a dynamic surface tension DST1 sec at 1 second universal surface age, a dynamic surface tension DST10 sec at 10 seconds universal surface age and a dynamic surface tension DST20 min at 20 minutes universal surface age, where DST20 min is less than each of DST1 sec and DST10 sec, and the difference between DST10 sec and DST20 min is greater than 9.2 mN/m at 21° C. or the difference between DST1 sec and DST20 min is greater than 15.5 mN/m at 21° C., and wherein the static surface tension of the ink is less than 50 mN/m. Maintaining a relatively large dynamic surface tension difference between the indicated time scales yields an optical density improvement in printed images.

Abstract: An inkjet printing fluid composition including water, a colorant, and a first polymer and a second polymer, wherein the first and second polymers have interactive functional groups and the second polymer is selected to form in the fluid a water soluble associated complex with the first polymer. Each of the first and second polymers are present at a concentration of at least 0.1 wt %, and the first and second polymers are present at a combined concentration of at least 1 wt %.

Abstract: An inkjet ink comprising water, colorant, and a dynamic surface active agent at an effective concentration such that dynamic surface tension DST20 min at 20 minutes universal surface age is less than each of dynamic surface tension DST1 sec at 1 second universal surface age and dynamic surface tension DST10 sec at 10 seconds universal surface age, and the difference between DST10 sec and DST20 min is greater than 9.2 mN/m at 21° C. or the difference between DST1 sec and DST20 min is greater than 15.5 mN/m at 21° C., and static surface tension of the ink is less than 50 mN/m. Large dynamic surface tension differences between the indicated time scales yield an optical density improvement in printed images. Anionic fluorosurfactant comprising a phosphate group at concentrations up to about 1 weight percent enables a combination of high optical density and good felt wetting in inkjet cartridges.

Abstract: An inkjet ink comprising water, colorant, and a dynamic surface active agent at an effective concentration such that the ink has a dynamic surface tension DST1 sec at 1 second universal surface age, a dynamic surface tension DST10 sec at 10 seconds universal surface age and a dynamic surface tension DST20 min at 20 minutes universal surface age, where DST20 min is less than each of DST1 sec and DST10 sec, and the difference between DST10 sec and DST20 min is greater than 9.2 mN/m at 21° C. or the difference between DST1 sec and DST20 min is greater than 15.5 mN/m at 21° C., and wherein the static surface tension of the ink is less than 50 mN/m. Maintaining a relatively large dynamic surface tension difference between the indicated time scales yields an optical density improvement in printed images.