Eastman-kodak Company

Teresa Joy Hosmer

David Charles Boris

Mridula Nair

David Howard Levy

Ramanuj Goswami

Margaret Jones Helber

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.

Particles with designed different sized discrete pores

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.

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 %.

Inkjet printing fluid composition

An inkjet ink comprising water, colorant, and a dynamic surface active agent at an effective concentration such that dynamic surface tension DSTat 20 minutes universal surface age is less than each of dynamic surface tension DSTat 1 second universal surface age and dynamic surface tension DSTat 10 seconds universal surface age, and the difference between DSTand DSTis greater than 9.2 mN/m at 21&#xb0; C. or the difference between DSTand DSTis greater than 15.5 mN/m at 21&#xb0; 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.

Inkjet ink comprising dynamic surface tension agent

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 DSTat 1 second universal surface age, a dynamic surface tension DSTat 10 seconds universal surface age and a dynamic surface tension DSTat 20 minutes universal surface age, where DSTis less than each of DSTand DST, and the difference between DSTand DSTis greater than 9.2 mN/m at 21&#xb0; C. or the difference between DSTand DSTis greater than 15.5 mN/m at 21&#xb0; 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.

This invention relates to a photothermographic element comprising a support, at least one photothermographic imaging layer, and at least one filter layer, wherein the filer layer comprises a heat-bleachable composition comprising a benzothiazine arylidiene filter dye, which filter dye is in the presence of an effective amount of a base precursor.

Thermally bleachable filter dye compositions comprising benzothiazine-dioxide arylidene dyes and base precursors for use in a photothermographic element

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Webster, NY, United States of America

Teresa Joy Hosmer