Lexmark International, Inc.

Qi Yin

Rahel Bekru Bogale

Jing X Sun

Ann P Holloway

Agnes Kam Zimmer

Xiaorong Cai

Michael James Bensing

Charles Edward Akers, Jr

Susan Hardin Butler

Jun Li

The invention relates to an aqueous cyan inkjet ink composition for use in ink jet printers comprising an aqueous carrier, a self dispersed cyan pigment, a polymeric additive, a surfactant, and a specific cosolvent mixture comprising a C-Cterminal alkanediol, a cyclic amide compound and its derivative, a polyol/polyalkylene oxide condensate, and a trihydric alcohol. Preferably, the self dispersed cyan pigment is surface modified with bisphosphonate group. The cyan inkjet ink demonstrates excellent stability, superior chroma, good printhead maintenance characteristics and high heater reliability in permanent and semi permanent printheads.

Aqueous cyan inkjet ink composition containing a mixture of a self-dispersed pigment and a specific cosolvent mixture

The present invention provides a pigment ink formulation containing a wax emulsion is disclosed. The wax emulsion comprises a specific wax and surfactant combination. In particular, the wax comprises a linear polyethylene wax and the surfactant is an alkyl ether carboxylate. The wax emulsion can be made by any process for preparing emulsions used by those skilled in the art such as typical homogenization methods. Applicants have discovered that such a wax emulsion can not only improve the scratch resistance of pigmented ink, but also improve other handling problems such as scuff and smear.

Wax emulsion for inkjet ink

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Lexington, KY, United States of America

Qi Yin